Torque Dynamometers

Speed-torque characteristics

Pull-in/pull-out torque

Angle-torque characteristics

Cogging torque

Torque ripple

■ Hysteresis BrakeA hysteresis brake consists of a rotor made of magnetic material with hysteresis characteristics and a gear-shaped stator with coil. The rotor rotates in a magnetic field generated in a gap of a stator. The rotor shaft is coupled with the test motor shaft. When the rotor is rotated by the test motor, the hysteresis brake absorbs energy of the rotor to rotate as hysteresis loss and works as a brake. Since the total amount of energy absorption (=rotor speed multiplied by torque) of hysteresis loss is proportional to the rotor speed, the brake torque then does not depend on the rotor speed. Thus, the hysteresis brake functions as a stable brake on the motor at the speed ranging from zero to high speed.Brake torque is controlled by the exciting current through the stator coil. It has the characteristics shown in Figure 3. The line represents the brake performance when controlling the exciting current.

Figure 1: Hysteresis brake structure

Coil

Rotor

Stator

Speed-torque measurements

2

■ Methods of detecting torque and speedIn Sugawara’s TA/TB-N series Dynamometers, Hysteresis Brakes are installed in the frame, supported by ball bearings as in Figure 2. In this structure, the force to rotate the brake stator generated by rotation of the test motor is detected by a load cell using a strain gauge. When the rotor is rotated while brake torque is generated, the brake torque generated is transmitted to the stator and detected by the load cell. Since this method can detect only the force to rotate the brake stator in a very static way, it is more durable, more stable, and more suitable to high-speed rotation, than detecting the torque of the axle of rotation.To increase the precision of detection, losses from the bearing supporting the brake must be low. Air bearings are used for TA models with low rated torque.The speed of rotation is detected by an optical encoder at 60 pulses per rotation. This encoder is also used to detect the direction of rotation using phase relationships.

■ Verification of torque dynamometer performanceThe performance of our torque dynamometers is verified by benchmark testing of Sugawara’s sample motors in installation service.

Hysteresis brake principles

For measurements of an electric motor’s speed-torque performance, the most important thing is determining which braking method (e.g., hysteresis braking, eddy current braking, powder braking, Prony braking, or motor braking) suits the nature and objectives of the measurement.The hysteresis brakes used in Sugawara Laboratories’ speed-torque measurement equipment are superior in several aspects, including their capacity for stable measurement and strong data reproducibility.

Exciting current

Brak

e to

rque

Figure 3: Brake characteristics

Frame

Hysteresis brake

Encoder

Load cellBearing

Figure 2: Load-torque detector structure

3

DMC-2 Controller

■ SpecificationsLoad characteristics and voltage/current measurement

Load control method

Torque control :

Speed control :

Measurement modes

Automatic mode :

Manual mode :

Calibration mode :

Torque measurement :

Torque measurement precision :

Measurement range :

RPM measurement : Measurement precision :

Measurement range :

Output power measurement :

Voltage measurement

Frequencies at which measurement is possible :

Voltage measurement precision :

Measurement range:

Current measurement

Frequencies at which measurement is possible :

Current measurement precision :

Measurement range:

Direct 5A ELEMENT :

Direct 50A ELEMENT :

CT implementation :

Sensor voltage input range (Optional) :

Conversion sensitivity setting range :

Input power measurement :

Power measurement precision :

Σ power measurement :

Efficiency measurement :

Power factor measurement :

controls motor load torque to configured value

controls motor RPM to configured value

load can be configured to up to 400 points

load configured and measured in increments of one point

calibrates detected torque values of torque detection components

displays average value for 64 items of data sampled at intervals of 2 msec

within ±0.25% of full scale (after calibration)

measurement range is set by the torque rating (seetable) of measurement

displays average value for up to 64 items of data sampled over 128 msec

within ±0.1% of range (full scale)

60P/R; 4000/8000/16000/32000 r/min 600P/R; 400/800/1600/3200 r/min

T [N·m] x S [r/min] x 0.1047

DC, 0.1 Hz - 1 MHz

refer to the specifications of WT1800

1.5/3/6/10/15/30/60/100/150/300/600/1000 V

DC, 0.1 Hz - 1MHz

refer to the specifications of WT1800

can be implemented randomly up to 6 elements for measurement of currents

10/20/50/100/200/500 mA, 1/2/5 A

1/2/5/10/20/50 A

6 A - 1500 A

50 mV - 20 V

0.00 - 9999.99 mV/A

the measured data of the WT1800 is read by communication port

refer to the specifications of WT1800

by calculation of the sum of the electric power measured by the specified element

by calculation of the ratio of the specified electric power and mechanical power

by calculating the ratio of the active power and the apparent power

Compatible personal computers:

Operating system :

Interface :

Connector :

Display of data :

Data storage and reading :

Printing :

Storage of measurement conditions :

Power supply :

Power consumption :

Dimensions W × H × D :

Weight :

IBM PC/AT-Compatible

Microsoft Windows XP/7 Professional (32bit)

USB or RS232C

USB B type(PC side is A) or D-sub 9pin.

graphs, values, and configuration menu displayed on personal computer monitor

measurement data can be stored in CSV-format files; stored data can be displayed in graph and table format

on-screen graphs and numerical data output to printer

llows user to save conditions including measurement range, measurement points, and graph sensitivity configured on the personal computer

single-phase AC100-120 V±10%, 50/60 Hz

single-phase AC200-240 V±10%, 50/60 Hz

200 VA or less

430×132.6×360 mm

10 kg or less

Communication with personal computer and WT1800 Precision Power Analyzer

Speed-torque measurement Controller

■ Common specifications: DMC-2

Basic configuration

Controller

Personal computer

TA/TB-N series Torque

Meter

　 (1) RPM S

　 (2) Torque T

　 (3) Output Po [W]

Precision Power Analyzer from Yokogawa Electric Corp.

A. Voltage E1–E6B. Current I1–I6C. Power P1–P6D. Σ power AE. Σ power BF. Efficiency AG. Efficiency BH. Power factor φ

■ Measurements

Option

4

TM-2S Torque MeterCombining this with TA/TB-N series Torque Meter allows measurements of speed and torque of AC and DC motors. It includes a function for speed measurement through automatic load sweeping. Measurement results can be output as analog signals.

■ Advantages● Control methods

Brake control : open-loop control using power supply

Torque control : fixed-torque servo control using torque value as

feedback to power supply

Speed control : fixed-speed servo control using RPM as feedback to

power supply

■ Basic configurationTorque Meter : TM-2S

Torque Meter : TA-5MN - TB-20N (12 models)

■ Common specifications : TM-2SPower supply: single-phase AC 100 - 120 V±10%, 50/60 Hz

single-phase AC 200 - 240 V±10%, 50/60 Hz

Power consumption: 200 VA or less

Dimensions W × H × D : 430×149×360 mm

Weight: 10 kg or less

WT1800 Precision Power AnalyzerAdding the WT1800 Precision Power Analyzer from Yokogawa Electric Corp.allows measurements of aspects such as driver input/output, including high-frequency specifications, and driver circuitry evaluations.

■ Advantages● WT1800 measurement precision : ±0.15%● Frequency power range : DC, 0.1 Hz–1 MHz● Voltage measurement Measurement range: 1.5 V–1,000 V● Current measurement : Up to 6 elements

■ Common specifications : WT1800 Power supply : single-phase AC 100 - 240 V±10%, 50/60 Hz

Power consumption : 150 VA or less

Dimensions W × H × D : 426×177×459 mm

Weight : 15 kg or less

DC motor measurement using torque controlsData differing from applied voltage displayed in overlayX axis: torque; Y axis: RPM/current

Three-phase AC motor measurement using RPM controlsAll items through motor and inverter input/output and efficiency displayedX axis: RPM; Y axis: torque, voltage, current, output power, input power, efficiency, power factor

Sample display of numerical data

■ Sample measurement data

5

Dynamometer

■ Dynamometer specifications

■ Advantages of TA/TB-N series Dynamometer● Uses hysteresis brake for measurement devices

● Enables stable measurements from low through high RPMs

● Compatible with broad range of torque ratings from 5 mN·m through 100 N·m

● Long-lasting noncontact brake

● Superior heat resistance

● Features air bearings for low-torque use

● Allows measurements even in the unstable ranges of AC motors

● More compact than motor brakes or other brake types

Speed-torque measurement

TA-5MN TA-10MN TA-20MN TB-50MN TB-100MN TB-200MN TB-500MN TB-1N TB-2N

5 mN・m 1 0 mN・m 20 mN・m 50 mN・m 100 mN・m 200 mN・m 500 mN・m 1 N・m 2 N・m

0.15 - 5 mN・m 0.3 - 10 mN・m 0.6 - 20 mN・m 1.5 - 50 mN・m 3 - 100 mN・m 6 - 200 mN・m 15 - 500 mN・m 0.03 - 1 N・m 0.06 - 2 N・m

Within ±0.25% of full scale (after calibration)

Air bearings Ball bearings

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Brake-stator reaction force detected by strain-gauge load cell

　　　　　　　　　　　 100 - 40,000 r/min 100 - 30,000 r/min

±（0.01％ of range ＋ 1 r/min）

　　　　　　　　　　　　　　　　　　　　　　　　Optical rotary encoder at 60 P/R (standard) or 600 P/R (optional)

　　　　　　　　　　　　　　　　　　　　　　　　Using two Optical signals at 1 P/R with 90° phase difference

　　　　　　　　　　　　　　　　　　　　　　　　　−

0.6×10-6 0.8×10-6 1×10 -6 2.4×10 -6 3.9×10-6 9.2×10-6 28×10-6 185×10-6 540×10-6

kg・m 2 kg・m 2 kg・m 2 kg・m 2 kg・m 2 kg・m2 kg・m2 kg・m2 kg・m2

φ 3 φ 4 　　　　　　φ 6 φ 8 φ 10 φ 12

Round

D-cut

4×2.5×20 mm

　　　　　　　　　　　　　　　　　130 mm 160 mm

200×240×350 mm 210×246×400 mm 210×276×500 mm

25 kg or less 20 kg or less 25 kg or less 30 kg or less 60 kg or less

MMJ-7C MMJ-9C

φ25 - 100 mm φ50 - 150 mm

RC-type rubber coupling BC-type metal coupling

— 0.8×10-6　kg・m 2

1.4×10-6 kg・m 2 3×10-6

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　DMC-2/TM-2S/PC-SAA*/PC-EMA-*/etc.

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　AC 100 V ±10%, 50/60 Hz (can be modified–AC 115 V, 200 V, 220 V)

*1: Minimum torque values are at 3000 r/min or less. *2: When using a rotary encoder of 600 P/R, RPM changes to 10 - 4000 r/min.

*3: For "G, b, t, l, h, W, H, D", please refer to the TA / TB-N series external view on page 8.

Model

Torque rating

Torque measurement range *1

Torque measurement precision

Brake support methods

Torque detection methods

RPM range *2

RPM measurement precision

RPM detection methods

Rotation-direction detection

Brake temperature protection

Brake-rotor moment of inertia

Shaft diameter G *3

Shaft shape *3

b × t × l

Shaft height (h)*3

Dimensions *3

W × H × D

Weight

Motor attachment hardware

Diameter of attachable motor

Compatible coupling

Coupling moment of inertia

Compatible control components

Power supply

kg・m 2

100 - 25,000r/min

6

0 10 20 30 40 50 60 70 80 900

10

20

30

40

50

60

70

80

90

100

TBー50MN MAXIMUM TIME (min.)

POWER (W)

0 10 20 30 40 50 60 70 80 900

20

40

60

80

100

120

140

160

180

100

TBー200MN MAXIMUM TIME (min.)

POWER (W)

0

50

100

150

200

250

300

400

0 10 20 30 40 50 60 70 80 90 100

TBー500MN MAXIMUM TIME (min.)

POWER (W)

0 10 20 30 40 50 60 70 80 900

50

100

150

200

250

300

350

400

450

100

TBー1N MAXIMUM TIME (min.)

POWER (W)

0 10 20 30 40 50 60 70 80 900

100

200

300

400

500

600

700

100

TBー2N MAXIMUM TIME (min.)

POWER (W)

0 10 20 30 40 50 60 70 80 900

250

500

750

1000

1250

1500

1750

100

TBー5N MAXIMUM TIME (min.)

POWER (W)

0 10 20 30 40 50 60 70 80 900

0.5K

1K

1.5K

2K

2.5K

3K

3.5K

100

TBー10N MAXIMUM TIME (min.)

POWER (W)

0 10 20 30 40 50 60 70 80 900

1K

2K

3K

4K

5K

6K

7K

100

TBー20N MAXIMUM TIME (min.)

POWER (W)

0 10 20 30 40 50 60 70 80 900

3K

6K

9K

12K

15K

18K

21K

100

TBー100N MAXIMUM TIME (min.)

POWER (W)

0 10 20 30 40 50 60 70 80 900

2K

4K

6K

8K

10K

12K

14K

100

TBー50N MAXIMUM TIME (min.)

POWER (W)

CAL

Calibration volume

Calibration bar

Weight

■ Torque-value calibration method

■ Air filter

■ Power absorption curve

▲

TB-5N TB-10N TB-20N TB-50N TB-100N

5 N・m 10 N・m 20 N・m 50 N・m 100 N・m

　0.15 - 5 N・m 0.3 - 10 N・m 0.6 - 20 N・m 1.5 - 50 N・m 3 - 100 N・m

100 - 12,000 r/min 100 - 5,000

r/min

Automatic cutoff of brake current at 80° or higher; also features buzzer and LED alarm

1.8×10-3 6.3×10-3 17.5×10-3 61×10-3 123×10-3

gk ・m 2 kg・m 2 kg・m 2 gk ・m 2 kg・m 2

φ 15 φ 18 φ 20 φ 30 φ 35

Key Channel

　 5×3×20 mm 　　　　 6×3.5×25 mm 8×4×25 mm

200 mm 230 mm 250 mm

0031×055 045×005 005×005 300×305×600mm ×1000 mm ×1240 mm ×1300 mm

65 kg or less 180 kg or less 210 kg or less 450 kg or less 800 kg or less

MMJ-10C MMJ-12B

φ60 - 180 mm φ40 - 200 mm

Subject to separate consultation

Subject to separate consultation

DMC-2

Subject toseparate

consultation

100 ～ 20,000 r/min

100 - 7,000

10 - 3,200r/min

( switchable )

tion)

7

POWER (Motor output power) (in watts) can be calculated as follows: torque (N·m) x RPM (r/min) x 0.1047Motor output power = POWER(Y-axis of the characteristic graph)

t

G

lb

W D

Hh

I

φdb c

● RC coupling dimensions chart

Diameter (d) Length (l)

φ 6 22

φ 10 30

φ 13 30

● BC coupling dimensions chart

Diameter (d) Length (l) Position (e) Screw (f)

φ 14 40 3 M3

φ 16 40 4 M4

φ 18 48 5 M4

● SC coupling dimensions chart

d l e f d1 l1

φ 26 75 7 2-M4 φ 26 25

φ 30 80 7 2-M4 φ 38 30

φ 35 98 8 2-M6 φ 38 33

φ 45 115 12 2-M8 φ 45 35

TORQUE CAL.

Diameterof attached

motor

Shape A Shape B Shape C Shape D

■ Indication of coupling dimensionsUsing model BC-6-8-14 as an example, “BC” indicates the material used (RC: rubber; BC: beryllium; SC: steel). The following “6” indicates the external diameter of the torque meter axle, “8” the external diameter of the axle of the motor subject to measurement and the internal diameter when connecting attachments, and “14” the external diameter of the coupling.

■ Safety coverIn certain cases — for example, when shaft alignment is performed incorrectly — the coupling may be damaged during measurement, causing it to fly off in random directions and leading to injury. Always implement adequate safety measures (e.g., attaching a safety cover).

■ Motor attachment hardwareThe standard hardware consists of models MMJ-7C through MMJ-12B. Sugawara Laboratories can also design and manufacture special hardware for use in production and inspection lines in addition to specialized couplings and other equipment, in accordance with client needs.

Options

■ Indication of attachment dimensionsUsing model BA-10-8-D as an example, “BA” or “SA” indicates the type of attachment, the first “10” the internal diameter of the coupling, the next “8” the external diameter of the axle of the motor subject to measurement, and “D” the shape.

■ Modifications for use with low-speed motorsFor measurements of low-speed motors, modifications (pattern-600 modifications) can be made to enable measurement in units of 0.1 r/min, thereby improving resolution. Note that the maximum RPM will be 4000 r/min.

■ TA/TB-N series Torque Meter

I

φd

φd

1

f

eI 1

I

φd

e

f

(Available up to 1,000 rpm)

8

Model

HB-100S

HB-200S

HB-500S

HB-1KS

HB-2KS

HB-5KS

HB-10KS

HB-20KS

HB-50KS

Rated torque

10 mN・m　　

20 mN・m　　

50 mN・m　　

100 mN・m　　

200 mN・m　　

500 mN・m　　

1 N・m　　

2 N・m　　

5 N・m　　

Maximum speed

30000 r/min

30000 r/min

30000 r/min

30000 r/min

20000 r/min

20000 r/min

20000 r/min

10000 r/min

10000 r/min

Rated current

330 mA

330 mA

330 mA

330 mA

330 mA

330 mA

330 mA

330 mA

330 mA

Moment of inertia

0.73 × 10-6 kg・m2　　　

0.9× 10-6 kg・m2　　　

2.4 × 10-6 kg・m2　　　

3.7 × 10-6 kg・m2　　　

16 × 10-6 kg・m2　　　

28 × 10-6 kg・m2　　　

1.85 × 10-4 kg・m2　　　

0.54 × 10-3 kg・m2　　　

1.8 × 10-3 kg・m2　　　

Coil resistance

11 Ω 　 　

11 Ω 　 　

16.5 Ω 　 　

16.5 Ω 　 　

23 Ω 　 　

30 Ω 　 　

35 Ω 　 　

25 Ω 　 　

38.5 Ω 　 　

Maximum input

25 W 　　

30 W 　　

75 W 　　

120 W 　　

170 W 　　

300 W 　　

400 W 　　

600 W 　　

1500 W 　　

Continuous input

5 W　 　

６ W　 　

１5 W　 　

25 W　 　

35 W　 　

60 W　 　

80 W　 　

120 W　 　

300 W　 　

Weight

370 g 　　

370 g 　　

500 g 　　

660 g 　　

910 g 　　

2 kg 　　

4.5 kg 　　

7.5 kg 　　

14 kg 　　

Model

HB-100S

HB-200S

HB-500S

HB-1KS

HB-2KS

HB-5KS

HB-10KS

HB-20KS

HB-50KS

a

φ 3.4

φ 3.4

φ 3.6

φ 3.6

φ 3.6

φ 3.6

φ 4.5

φ 6

φ 7

b

46

46

58

58

72

88

114

130

166

c

φ 53

φ 53

φ 68

φ 68

φ 80

φ 96

φ 124

φ 140

φ 180

d

φ 40

φ 40

φ 50

φ 50

φ 62

φ 76

φ 104

φ 120

φ 150

e

φ 3

φ 3

φ 4

φ 6

φ 6

φ 8

φ 9

φ 12

φ 15

f

22

22

37

45

42

41.5

54

59

61

g

3

3

5

8

5

5

5

5

7.3

h

6

6

6

6

6

8

10

10

10

i

43

43

42

40

43

57

71

83

92

j

φ 35

φ 35

φ 46

φ 46

φ 56

φ 70

φ 96

φ 116

φ 152

k

86

86

112

116

116

133

161

183

191

l

φ 3

φ 3

φ 4

φ 5

φ 5

φ 6

φ 8

φ 10

φ 12

c d

e

f g h

k

l

i4- aP.C.D.b

j

High-performance brake unit suitable for use in motor dynamometers, dedicated measuring jigs, etc.The HB series Hysteresis brake unit applies a uniform braking force according to the electric current supplied regardless of rotation speed. This compact, easy-to-use high-performance load applying device is used in our systems for the measurement of motor speed and torque characteristics.

Hysteresis brake unit

■ Advantages● New and improved inner and outer teeth ensure

high-precision control.● Unit structured to minimize moment of inertia.● Maximum speed: 30,000 r/min. (Supports wide speed range;

low to high rpm.) (* Maximum speed varies depending on model and rating.)● Contact-less brake mechanism offers long service life.● Minimum effect from ambient temperature changes.● More compact than motor brake or other brake types. ● 13 models available, with rated torques ranging from 5 mN・m

to 50 N・m. ● Products can be tailor-made according to customer need.

■ External diagram of HB series Hysteresis brake unit

■ Specifications

■ Dimensions (mm)

9

■ Micro Stepper Motor MeasurementSupersensitive Sensor Set SS-R2N is now available.Enables accurate and stable measurement of the micro stepper motor torque of less than 0.1 mN·m. It succeeded in testing torque of less than 0.002 mN·m of extremely small stepper motors. Suitable also for lead screw motors.

Stepper Motor Torque Tester SMC-2/SMT-2This model uses Prony (winding) braking, the braking method with the strongest demonstrated performance for stepping motor measurements. Used with a personal computer, it provides precise automatic measurements of pull-in and pull-out torque.

■ Advantages● Minimal moment of inertia of the tester

By adopting Prony braking, the system provides stable measurement unaffected by moment of inertia of the tester and coupling loss, which is unavoidable in conventional torque testers. The advantage is obvious especially in pull-in torque testing. For micro motors, zero inertia testing is possible by winding the brake thread directly on the shaft.

● Definition-based measurementThe pull-in torque is measured exactly according to its definition: the maximum torque at which the motor can start from the holding state without losing steps. The resulting data has a high correlation with the data by traditional double balance method.

● Broad measurement rangeSeven models of sensors, from 0.2 N to 20 N, allow wide range of high-precision measurement. By selecting Sensors and Pulleys, the system measures small/micro stepper motors of 0.1 to 400 mN·m.

● Easy-to-see presentationMotor characteristics are easily seen on automatically plotted Frequency-Torque curves. Data can be overlaid on the graph up to four data sets.

● Can be controlled by standard personal computersAllows control of measurement, display, and storage of data by standard personal computers running Windows.

Measurement of pull-in and pull-out torque Stepper Motor Tester

■ Sample measurement data

▲Pull-in and pull-out torque curve of a five-phase stepper motor.

(Logarithmic scale)

X axis: frequencyY axis: torque

▲Pull-in and pull-out torque curve of a low torque (0.2 mN·m or less) micro stepper motor. (Linear scale)

▲Numerical data displayX axis: frequencyY axis: torque

10

RS-232C

F1 F2

MICRO STEPPER MOTOR TESTER SMT-2

SMC-2

POWER

SENSORFREQUENCY

Controller SMC-2 PCMicro Stepper Motor Tester SMT-2Sensor Set SS-*N

0.2

0.5

1

2

5

10

20

SS-R2N

SS-R5N

SS-1N

SS-2N

SS-5N

SS-10N

SS-20N

SensorRating

[N]Sensor set

1

0.1

0.25

0.5

1

2.5

5

10

5

0.5

1.25

2.5

5

12.5

25

50

Pulley Diameter [mm]

10

1

2.5

5

10

25

50

100

20

2

5

10

20

50

100

200

40

4

10

20

40

100

200

400

[mNm]

Measurement begins

Frequency slowly increased to measurement frequencywhile confirming no step loss

Load gradually increased until step loss detected

Pull-out torque: torque value immediatelypreceding step loss

Outputs signals at measurementfrequency

YES

YES

YES

YES

NO

NO

NO

NO

Direction of rotation detected?

Measurement of pull-in torquerequested?

Step loss detectedduring defined duration?

Pull-in torque dataalready recorded?

Final recorded data is determinedto be pull-in torque

Last measurementfrequency reached?

Measurement completes

Slightly decreases the load

Records the torque value at this pointas pull-in torque data,

and slightly increases the load

■ Automatic measurement methodFollowing detection of motor rotation direction, frequency measure-ments are performed from low to high frequency.● Pull-out torque

Gradually increase loads after slowly revving the motor to the measurement frequency. When loss of synchronization is detected, the value immediately preceding this loss is determined to be the pull-out torque value.

● Pull-in torqueStarting from the holding state following measurement of pull-out torque, the configured frequency is output to the motor and loss of synchronization detected. Based on these results, the motor is rotated at the measurement frequency while increasing and decreasing loads and loss of synchronization monitored once again. This process is repeated until the maximum load torque value at which synchronized rotation can be performed is detected. This value is determined to be the pull-in torque.

■ System and MethodThe Brake Thread is wound on the Pulley attached to the Test Motor shaft, and it’s both ends are attached to the hooks of the two Sensors. When the Moving Sensor moves to tighten the Brake Thread, the torque is loaded to the Test Motor via a Pulley.

■ Basic configurationPulse motor analyzer : SMT-2Controller : SMC-2Sensor set : SS-*NPersonal computer : Microsoft Windows XP/7

■ Torque measurement range table

■ SpecificationsLoad method : prony brakingSensor rating : 7 types: 0.2/0.5/1/2/5/10/20 NTorque measurement precision : within ±1% of torque range Maximum allowable load : 200% of Sensor ratingTorque measurement range : T=Sensor Rating × Pulley Diameter/2 (refer to the torque measurement range table on the left.)Torque analog output from SMC-2 : DC 2 V/torque ratingDrive frequency range : 16 - 50,000 HzDrive signals : square wave (duty 1:1), TTL-level voltage signal or open-collector signalDimensions (W×H×D) and weight SMT-2 : 450×200×370 mm 12 kg SMC-2 : 430×132.6×360 mm 9 kg S-*N (×2) : 80×122×66 mm 0.9 kg (×2)Compatible personal computer : IBM PC/AT-Compatible　Operating system : Microsoft Windows XP/7　Interface : RS232C serial portPower supply : single-phase AC 100 - 120 V ±10%, 50/60 Hz single-phase AC 200 - 240 V ±10%, 50/60 HzPower consumption : 50 VA or less

DriverTest Motor

Pulley

Brake Thread

MovingSensor

FixedSensor

MotorStand

11

Torque Meter

Operatingmotor

ClutchRotary

encoder

Torqueconverter

Torque

Motorsubject to

measurement

Operating belt

Coupling

Fixing Fixing

Torque

Torque detection springcharacteristics

Torque characteristics formeasurement target Measured torque value

Angle Angle

Torque Torque

Torque detection springcharacteristics

Torque characteristics formeasurement target Measured torque value

Measurement not possiblein this zone

Angle

Angle

ATM-MN Torque MeterBy rotating the motor rotor at 1 r/min while holding its case, it tests angle-torque characteristics such as low level of cogging torque of brushless DC motors and detent torque of stepping motors. It can also measure torque of non-rotating test samples such as clutches and oil seals.

■ Advantages● Achieves high detection sensitivity

Incorporates Sugawara’s unique high-rigidity torque sensor configured in a vertical structure which ensures law level of loss torque by eliminating one (test motor side) of the two bearings that hold the sensor, enabling detection of low torque levels of 0.01 mN·m or less.

● Realizes measurement unaffected by shaft misalignmentThe eccentricity resulting from misalignment of the tester shaft and the test motor shaft significantly affects the data especially in measuring low level of cogging torque. Employing a vertical structure, ATM-MN Torque Meter resolves this problem by using a coupling that only suspends the test motor. This also significantly reduces the time required to set the test motor.

● Provides accurate peak-to-peak measurement of cogging torqueThe high spring constant of the torque sensor enables accurate peak-to-peak measurement of cogging torque, including the negative range. (See Figures 1, 2.)

● Broad measurement rangeThe model offers a wide range of seven measurement heads, with torque ratings ranging from 0.5 mN·m to 100 mN·m, allowing selection of the best suitable model of torque rating.

● High-visibility measurement dataMotor characteristics are easily ascertained on automatically plotted performance graphs, and measurement data can be overlaid. In addition, the cursor can be used to read accurate values of measurement points. The graph and the data displayed on screen can be printed from a personal computer.

● Can be controlled using standard personal computersAllows control of measurements, display, and storage of data with a standard personal computer running Windows. Data is stored in CSV-format files for compatibility with other software applications.

Measurement of angle-torque characteristics

Figure 1: Measurement when the sensor spring constant is high (i.e., when using a hard spring)Torque characteristics of the measurement target and torque detection spring characteristics intersect at a single point in all zones, allowing stable measurement from valleys to peaks.

Figure 2: Measurement when the sensor spring constant is low (i.e., when using a loose spring)In zones in which torque characteristics of the measurement target and torque detection spring characteristics intersect at multiple points, the sensor will jump to the more stable point ( i. e. the point where torque goes up as the test sample rotates. ), preventing measurement in zones where torque goes down as it rotates.

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■ Basic configurationController : DMC-2

Torque Meter : ATM-MN-series

Torque Calibration Tool : ATC3-*

Personal computer : Microsoft Windows XP/7 Professional (32bit)

■ Specifications Torque rating

ATM-R5MN : 0.5 mN･m ATM-2MN : 2 mN･m ATM-5MN : 5 mN･m ATM-10MN : 10 mN･m ATM-20MN : 20 mN･m ATM-50MN : 50 mN･m ATM-100MN : 100 mN･mOperating speed

AUTO mode : approx. 0.08 r/min(Angle measuring area:2.6° to 90° incl.)

approx. 0.2 r/min (Angle measuring area:90° to 180° incl.)

approx. 1 r/min (Angle measuring area:180° to 360° incl.)

MANUAL mode : approx.1 r/min

Operating direction : CW/CCW

Measurement mode

AUTO mode : measures in the preset angle area (2.6° to 360°)

MANUAL mode : measures from the current angle until the STOP button is clicked

CAL mode : calibrate the Torque Meter (ATM-MN) and perform zero-adjustment of the measured torque and angle

Torque detection precision : within ±1% of full scale

Torque detection component torsion angle : 3600 pulse/revolution using pulse rotary encoder

Angle measurement precision : ±1.5° or less

Accessories included Controller : power cable USB cable, Windows software connecting cable (Optional)

Torque meter : X-Y-Z stage

Torque calibration equipment : ATC3- (sold separately) R5MN/2MN/5MN/10MN/20MN/50MN/100MN

Dimensions, weight

Controller W×H×D : 430 × 132.6 × 360 mm,　10 kg or less

Torque meter W×H×D : 300 × 646 × 350 mm,　70 kg or less

Compatible personal computers : IBM PC/AT-Compatible

Operating systems : Microsoft Windows XP/7 Professional (32 bit)

Interface : USB or RS232C

Connector : USB B type (PC side is A) or D-sub 9 pin.

Power supply : single-phase AC100 - 120 V ±10%, 50/60 Hz

single-phase AC200 - 240 V ±10%, 50/60 Hz

Power consumption : 50 VA or less

■ Torque CalibrationATC3-* Calibration Jig Set is to calibrate torque value of the ATM cogging torque meters. Since the ATM has a vertical measurement axis, it uses two pulleys to convert vertical weight forces to horizontal forces. Torque is calibrated by suspending two equal weights from both ends of the calibration bar to apply couple of forces to the measurement axis.

▲ Measurement of stepping motor detent torque and holding torque (overlay display)

X axis: angle 0 to 360° Y axis: torque -25 to 25 mN·m Function of cursor: displays peak-to-peak measurement between left and

right cursors (including maximum and minimum values between cursors)

▲ Measurement of torque ripple of DC fan motor under 1 r/min speed control. Overlaid display of data at different applied voltages (6 V/ 12 V) X axis: angle 0 to 360° Y axis: torque -10 to 10 mN·m

Calibrationweight

Pulley

Force point

Measurement axle

T: torque

Force point

Calibrationweight

■ Sample measurement data

m

m

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▲Measuring torque vs. angle for Z-axis torque (with latch)

Three Axes Torque Meter PC-MCT5-15The PC-MCT5-15 Motor Analyzer is a system to measure the Angle-Torque characteristics of the voice coil motors (VCM) used in various devices including the hard disk drives. The system measures torque vs. rotation angle generated on the three axes of the coil by rotating the motor magnet at very low speed (0.6 degree/sec to 2.0 degree/sec, 8 step adjustable). The test data is displayed on the PC and is saved as a CSV file.

■ Triaxial torque measurementMeasures the torque generated in the voice coil motor coil in

three axes (X, Y, and Z axes).

■ Sample measurement data

Voice Coil Motor Torque Measuring System

■ Basic configurationMotor Analyzer : PC-MCT5-15

Torque Meter Measuring Unit : ATV1-10M01

Magnet Rotating Jig : MTJ-001

Personal computer (Windows OS)

Coil Excitation Power Supply : PMC35-0.5A (Kikusui Electronics)

■ Motor Analyzer main specificationsModel : PC-MCT5-15 Motor Analyzer

Rated torque : 10 mN･m/F.S

Drive speed : 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0 deg/sec

Angular measuring range : total 60° within ±90° range

Measurement modes

Point measurement : allows specification of the desired angle for measurement points 0 to 100

Continuous measurement : measure the specified angular range starting at any specified measurement point.

Dimensions W x H x D : 430×150×360 mm

Mass : 10 kg or less

■ Torque Meter Measuring Unit main specificationsModel : ATV1-10M01 Torque Meter Measuring Unit

Rated torque : 10 mN･mTorque detection accuracy : rated value ±1%

Dimensions W x H x D : 440×430×390 mm

Mass : 100 kg or less

■ Magnet Rotating Jig main specificationsModel : MTJ-001 Magnet Rotating Jig

Angular detection accuracy : not exceeding ±0.001°

Maximum drive speed : 2.0 deg/sec

Dimensions W x H x D : 260×70×170 mm

Mass : 10 kg or less

■ Coil Excitation Power Supply main specificationsModel : PMC35-0.5A Coil Excitation Power Supply

(Kikusui Electronics)

Output specifications : max. 5 V, max. 0.5 A

Dimensions W x H x D : 107×124(134)×270(305) mm 　 (max. dimensions in parentheses)

Mass : 3.5 kg or less

Coil

(Pitching)

(Yawing)

Fulcrum

(Rolling)

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PC-MTS-01 Multi Torque MeterThis single system covers all aspects of motor torque measurement, such as speed-torque, cogging torque, and torque ripple. Combined with a power meter, it can be used to measure induced voltage. It can also be used in combination with environmental testing equipment.

Test motor

Multi Torque Meter

Rotary encoderfor angle detection

Torque detector for angle-torque

Hysteresis brake

Brake torque detectorRotary encoder

for RPM detection

Operating clutch

Operatingmotor

■ Basic configurationTorque Measurement Component : MTS-2N01Control Component : PC-MTS-01Personal computer : Microsoft Windows XP/7Precision Power Analyzer : WT1800 (from Yokogawa Electric Corp.)

Environmental testing equipment : subject to separate consultation

■ Advantages● Simple structure of brake and various sensors configured on the

main shaft enable high speed testing (up to 20,000 r/min).● Easily-switchable measuring modes: Speed-Torque measurement

mode and Angle-Torque (Cogging Torque and Torque Ripple) measurement mode.

● Uses time-tested hysteresis brakes for load control, and uniquely developed torque sensors for torque detection.

● Allows easy shaft alignment, with high precision using special motor-fixing hardware.

● Offers superior motor fixing, thermal insulation, and bearing structure for use with environmental testing equipment.

Measurement of DC motor cogging torque in angle-torque modeRPM set to 1 r/min, torque range to 20 mN·mX axis: angle of rotation 0 to 360°Y axis: torque -30 to 270 mN·m

Measurement of torque ripple for the same DC motor in angle-torque mode RPM set to 10 r/min, torque range to 200 mN·mData under changes in voltage displayed overlaidX axis: angle of rotation 0 to 360°Y axis: torque -30 to 270 mN·m

DC motor measured under torque controls in S-T modeX axis: torqueY axis: RPM, voltage, current, power, efficiency

▲▲

▲

■ Sample measurement data

■ Structure of the MTS measurement

■ SpecificationsMeasurement of load torque characteristics

Load torque control range : 0.06 to 2 N·m

Load torque detection precision : ±0.5% of range (full scale)

Allowable RPM : up to 20,000 r/min

RPM measurement precision : ±0.2% of range (full scale)

Maximum allowable power input : 600 W for five minutes

Torque ripple (restraint)/cogging torque measurement

Torque detection range

When measuring torque ripple : range (full scale) -2 to 2 N·m

When measuring cogging torque : range (full scale) -50 to 50 mN·m

Torque detection precision

When measuring torque ripple : ±0.5% of range (full scale)

When measuring cogging torque : ±1.5% of range (full scale)

Operating RPM : 1 to 20 r/min

Operating direction of rotation : CW/CCW

Operating angular measurement resolution : approximately 0.088° ( 2 r/min or less)

approximately 0.35°( 3 r/min or more)

Induced voltage measurement

Work operating RPM : 500 to 2,000 r/min

Work torque : 200 mN·m or less

Voltage measurement : particulars subject to separate consultation

Multi Torque Meter

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Damage and scattering of the coupling and the test motor during measurement may cause injury.Always use the protective cover.

Data measurement services using Sugawara Laboratories’ torque dynamometers are available. Please visit the Sugawara Laboratories website for more information.The contents of this pamphlet are subject to change without notice to permit improvementsDanger

Head office/Tokyo sales office: 8-2 Minami-Kurokawa, Asao-ku, Kawasaki-shi, Kanagawa Prefecture 215-0034, Japan Tel. 044-989-7320, fax 044-989-7338

Osaka sales office: 6-17 Yokomakura-Nishi, Higashiosaka-shi, Osaka Prefecture 578-0956, Japan Tel. 072-966-1061, fax 072-966-0961

Nagoya sales office: 1-2-29 Kamimaezu, Naka-ku, Nagoya-shi, Aichi Prefecture 460-0013, Japan Tel. 052-331-6562, fax 052-331-6604

URL: http://www.sugawara-labs.co.jp/ E-mail: info@sugawara-labs.co.jp

10YO1404

*

Products: Xenon Flash, Torque Dynamometers, Bearing Inspection Systems, etc.

For inquiries, please contact:

Micro torque-speed measurement

PC-MMA1 Micro Torque MeterThis model measures speed and torque characteristics and power output of miniature DC motor of the speed up to 30,000 r/min and the torque up to 1 mN·m.  Adding a voltage/current measurement component allows the model to measure voltage and current.

■ Advantages● This model calculates torque from relative speed between the

motor and the magnetic-field generator, enabling stable and high-precision measurements from 30,000 r/min to the stall.

● Enables accurate shaft alignment by the X-Y stage and the special devices included in the system.

■ SpecificationsBraking method: eddy current brakingTorque measurement: calculated from relative difference in RPM

between motor subject to measurement and braking motor

Torque measurement range: 0.1/1/2 mN·mRPM measurement: average over intervals of 128 ms, derived by

calculating optoelectric pulse frequencyRPM measurement range: up to 30,000 r/minRPM measurement precision: ±0.1% of range (full scale)Measurement modes automatic mode: automatic measurement up to 400 points manual mode: manual measurement in increments of one

pointPower output measurement: T[mN・m]×S [r/min]×0.1047Load-control methods torque control: servo control using fixed load torque open loop sweep: RPM of load-control motor controlledCompatible personal computers: IBM PC/AT-CompatibleOperating systems: Microsoft Windows XPInterface: at least one RS-232C serial portPower supply: single-phase AC 100 V ±10%, 50/60 HzDimensions (W x H x D), weight Control component: 430 x 150 x 360 mm , 10 kg or less Measurement component: 400 x 260 x 360 mm , 30 kg or less

■ Basic configurationTorque Meter: PC-MMA1Torque Measurement Component: MMT-1MNPersonal computer: Microsoft Windows XP

Measurement of linear actuatorPC-FLA1 Linear Load TesterSugawara's Linear Load Tester measures the propulsive characteristics (in an excited state) and the cogging characteristics (in a non-excited state) of the linear motors and actuators. It controls the force loaded on the test motor by directly moving the load cell. It offers stable and accurate measurement unaffected by the moment of inertia, compared with methods using weights. A linear scale with the resolution of 1 um is adopted for detection of distance, enabling data of high accuracy in both the backward and the forward directions.

■ Advantages●Measures propulsive characteristics in an excited state.●Measures cogging force characteristics in a non-excited state.

■ SpecificationsTorque rating: 200 N/FS Pulling and pushing forceForce measurement precision: within ±0.5% of torque ratingForce measurement range: from 10% to 100% of torque ratingMoving distance: 100 mm maximumMoving distance measurement precision: ±10 µmMoving distance measurement resolution: 1 µm

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