UNIT 14 Three-Phase Salient Pole Synchronous Motor€¦ · Three-phase Power Supply Module. 1....

14-1

UNIT 14

Three-Phase Salient Pole Synchronous Motor

14-2

EXERCISE 14-1 Connection and Motor Direction Control

OBJECTIVE After completing this exercise, you should able to demonstrate the connection of a

three-phase salient pole synchronous motor and control the direction of rotation of the

motor.

EQUIPMENT REQUIRED

Qty Description Cat. No.

1 Three-phase Salient Pole Synchronous Machine EM-3330-3A

1 Three-phase Power Supply Module EM-3310-1B

1 Synchronous Machine Exciter EM-3310-1C

1 Three-pole Current Limit Protection Switch Module EM-3310-2A

1 Reversing Switch Module EM-3310-2C

1 Digital DCA Meter EM-3310-3A

1 Digital DCV Meter EM-3310-3B

1 Laboratory Table EM-3380-1A

1 Experimental Frame EM-3380-2B

or Experimental Frame EM-3380-2A

1 Connecting Leads Holder EM-3390-1A

1 Coupling EM-3390-2A

1 Coupling Guard EM-3390-2B

1 Shaft End Guard EM-3390-2C

1 Connecting Leads Set EM-3390-3A

1 Safety Bridging Plugs Set EM-3390-4A

14-3

Fig. 14-1-1 Circuit diagram for rotation direction control

14-4

Fig. 14-1-2 Connection diagram for rotation direction control

14-5

PROCEDURE

CAUTION: High voltages are present in this laboratory exercise! Do not make or modify any connections with the power on unless otherwise specified! If any danger occurs, immediately press the red EMERGENCY OFF button on the Three-phase Power Supply Module.

1. Place the Three-phase Salient Pole Synchronous Machine on the Laboratory Table.

Install the required Modules in the Experimental Frame. Construct the circuit in

accordance with the circuit diagram in Fig. 14-1-1 and the connection diagram in Fig.

14-1-2. Have the instructor check your completed circuit.

2. On the Reversing Switch Module, set the reverse switch to the STOP position.

3. Set the voltage control knob on the Synchronous Machine Exciter Module to the 0

position.

4. Sequentially turn on the 3-P Current Limit Protection Switch, Three-phase Power

Supply, and Synchronous Machine Exciter Modules.

5. On the Synchronous Machine Exciter Module, slowly turn the voltage control knob

clockwise so that the field voltage (obtained from the Digital DCV Meter) is 60 V.

Then turn off the Synchronous Machine Exciter.

6. Hold the synchronizing button on the panel of Three-Phase Salient Pole Synchronous

Machine and turn on the Synchronous Machine Exciter. Set the reverse switch on the

Reversing Switch Module to the FOR position.

7. After 5 seconds approximately, release the start button on the panel of Three-Phase

Salient Pole Synchronous Machine. The motor should rotate at the rated speed of

1,800 rpm for 60-Hz power (1,500 rpm for 50-Hz power). Observe and record the

direction of rotation of the motor.

The direction of rotation = ______________________

14-6

8. Set the reverse switch on the Reversing Switch Module to the STOP position. Then

turn off the Synchronous Machine Exciter.


Machine. Turn on the Synchronous Machine Exciter. Set the reverse switch on the

Reversing Switch Module to the REV position.

10. After 5 seconds approximately, release the synchronizing button on the panel of

Three-Phase Salient Pole Synchronous Machine. The motor should rotate at a speed

of its rated value 1,800 rpm for 60-Hz power (1,500 rpm for 50-Hz power). Observe

and record the direction of rotation of the motor.

The direction of rotation = ______________________

11. On the Reversing Switch Module, set the reverse switch to the STOP position.

12. Sequentially turn off the Synchronous Machine Exciter, Three-phase Power Supply,

and 3-P Current Limit Protection Switch modules.

13. You can couple the Digital RPM Meter to the motor for reading the motor speed.

14-7

EXERCISE 14-2 Excitation Characteristic

OBJECTIVE After completing this exercise, you should able to demonstrate the excitation characteristic

of a three-phase salient pole synchronous motor.

EQUIPMENT REQUIRED



1 Magnetic Powder Brake Unit EM-3320-1A

1 Brake Controller EM-3320-1N




1 Four-pole Switch Module EM-3310-2B



1 Digital Power Analysis Meter EM-3310-3H

or Digital ACA Meter EM-3310-3C

Digital ACV Meter EM-3310-3D

Digital Three-phase Watt Meter EM-3310-3E

Digital Power Factor Meter EM-3310-3F







14-8

Fig. 14-2-1 Circuit diagram for excitation characteristic test

14-9

Fig. 14-2-2 Connection diagram for excitation characteristic test

14-10

PROCEDURE


1. Place the Three-phase Salient Pole Synchronous Machine, Magnetic Powder Brake

Unit, and Brake Controller on the Laboratory Table. Mechanically couple the

Three-phase Salient Pole Synchronous Machine to the Magnetic Powder Brake Unit

using a Coupling. Securely lock the Machine Bases together using delta screws.

Install the Coupling Guard and the Shaft End Guard. Electrically connect the Brake

Controller to the Magnetic Powder Brake Unit using the supplied cable.

Complete this laboratory exercise as quickly as possible to avoid the rise in temperature under load condition.

2. Install the required Modules in the Experimental Frame. Construct the circuit in

accordance with the circuit diagram in Fig. 14-2-1 and the connection diagram in Fig.

14-2-2. Have the instructor check your completed circuit. Note: The thermal

switches of Three-phase Salient Pole Synchronous Motor and Magnetic Powder Brake

Unit must be connected together.

Make yourself familiar with the operation of Brake Controller by referring to the

EM-3320 Operation Manual.

Before using the Brake Controller and Magnetic Powder Brake Unit, you must first

calibrate the torque display of the Brake Controller to 0 kg-m by adjusting the zero adj

knob located on the rear panel of Magnetic Powder Brake Unit with the power on.

3. On the Four-Pole Switch Module, set the on-off switch to the OFF position.

4. On the Synchronous Machine Exciter Module, set the voltage control knob to the 0

position.

14-11

5. Sequentially turn on the 3-P Current Limit Protection Switch, Three-phase Power

Supply, and Synchronous Machine Exciter Modules.

6. Slowly turn the voltage control knob on the Synchronous Machine Exciter so that the

field current If (obtained from the Digital DCA Meter) is equal to 0.3A. Then turn off

the Synchronous Machine Exciter.


Machine. Turn on the Synchronous Machine Exciter. Set the on-off switch on the

Four-Pole Switch Module to the ON position.


Three-Phase Salient Pole Synchronous Machine. The motor should rotate at the

rated speed of 1,800 rpm for 60-Hz power (1,500 rpm for 50-Hz power).

9. Manipulate the Brake Controller to operate in Mode\Closed Loop\Constant Torque

mode and set the output torque to each of the torque settings listed in Table 14-2-1. If

the Controller doesn’t operate normally, reboot it by pressing the RESET button. If the rotor of motor is locked by a heavy brake torque, turn off the power immediately.

10 Record the values of the power factor cos θ, motor current I, motor voltage E, and

power P displayed by the Digital Power Analysis Meter in Table 14-2-1.

11. Manipulate the Brake Controller to release the braking. That is to say, release the

braking by pressing the ESC or BACK button on the Brake Controller.

12. Repeat steps 3 through 11 for other settings of the field current If listed in Table 14-2-1. Note: The motor current must not exceed 130% of the rated current,1.17A x 1.3 =

1.521A.

13. Sequentially turn off the Three-phase Power Supply, 3-P Current Limit Protection

Switch modules, Magnetic Powder Brake Unit and Brake Controller.

14-12

Table 14-2-1 Measured values of cos θ, I, E, and P

T (kg-m) 0 0.05 0.1 0.15 0.2 0.25 cos θ I (A) E (V)

If=0.15A

P (W) cos θ I (A) E (V)

If=0.3A


If=0.45A

P (W)

14-13

Experimental Results

Table 14-2-1 Measured values of cos θ, I, E, and P (50-Hz power)

T (kg-m) 0 0.05 0.1 0.15 0.2 0.25 cos θ 0.237 0.632 0.76 － I (A) 0.43 0.51 0.71 － E (V) 220 220 220 －

If=0.15A

P (W) 39 119 222 － cos θ -0.826 -0.955 -0.973 -0.984 0.971 － I (A) 0.111 0.32 0.52 0.777 1.12 － E (V) 220 220 220 220 220 －

If=0.3A

P (W) 35 121 205 270 391 － cos θ -0.26 -0.571 -0.75 -0.86 -0.922 -0.975 I (A) 0.46 0.6 0.74 0.91 1.05 1.27 E (V) 220 220 220 220 220 220

If=0.45A

P (W) 47 124 216 303 387 480

14-14



T (kg-m) 0 0.05 0.1 0.15 0.2 0.25 cos θ 0.29 0.585 0.75 0.795 I (A) 0.45 0.51 0.66 0.95 E (V) 220 220 220 220

If=0.15A

P (W) 52 120 206 280 cos θ - 0.634 - 0.87 - 0.929 - 0.949 - 0.967 - 0.976 I (A) 0.2 0.34 0.51 0.7 0.9 1.12 E (V) 220 220 220 220 220 220

If=0.3A

P (W) 52 120 189 250 354 449 cos θ - 0.261 - 0.5 - 0.646 - 0.76 - 0.83 - 0.9 I (A) 0.58 0.67 0.79 0.91 1.08 1.2 E (V) 220 220 220 220 220 220

If=0.45A

P (W) 62 130 199 273 369 420

14-15

EXERCISE 14-3 Load Characteristic

OBJECTIVE

After completing this exercise, you should able to demonstrate the operating characteristic

of a three-phase salient pole synchronous motor under load condition.

EQUIPMENT REQUIRED



1 Magnetic Powder Brake Unit EM-3320-1A

1 Brake Controller EM-3320-1N




1 Four-pole Switch Module EM-3310-2B



1 Digital Power Analysis Meter EM-3310-3H

or Digital ACA Meter EM-3310-3C

Digital ACV Meter EM-3310-3D

Digital Three-phase Watt Meter EM-3310-3E

Digital Power Factor Meter EM-3310-3F





1 Coupling EM-3390-2A

1 Coupling Guard EM-3390-2B

1 Shaft End Guard EM-3390-2C



14-16

Fig. 14-3-1 Circuit diagram for load characteristic test

14-17

Fig. 14-3-2 Connection diagram for load characteristic test

14-18

PROCEDURE


1. Place the Three-phase Salient Pole Synchronous Machine, Magnetic Powder Brake

Unit, and Brake Controller on the Laboratory Table. Mechanically couple the

Three-phase Salient Pole Synchronous Machine to the Magnetic Powder Brake Unit

using a Coupling. Securely lock Machine Bases together using delta screws. Install

the Coupling Guard and the Shaft End Guard. Electrically connect the Brake

Controller to the Magnetic Powder Brake Unit using the supplied cable.

Complete this laboratory exercise as quickly as possible to avoid the rise in temperature under load condition.

2. Install the required Modules in the Experimental Frame. Construct the circuit in

accordance the circuit diagram in Fig. 14-3-1 and the connection diagram in Fig.

14-3-2. Have the instructor check your completed circuit. Note: The thermal

switches of Three-phase Salient Pole Synchronous Motor and Magnetic Powder Brake

Unit must be connected together.

Make yourself familiar with the operation of Brake Controller by referring to the

EM-3320 Operation Manual.

Before using the Brake Controller and Magnetic Powder Brake Unit, you must first

calibrate the torque display of the Brake Controller to 0 kg-m by adjusting the zero adj

knob located on the rear panel of Magnetic Powder Brake Unit with the power on.

3. On the Four-Pole Switch Module, set the on-off switch to the OFF position.

4. On the Synchronous Machine Exciter Module, set the voltage control knob to the 0

position.

14-19

5. Sequentially turn on the Brake Controller, Magnetic Powder Brake Unit, 3-P Current

Limit Protection Switch, Three-phase Power Supply, and Synchronous Machine

Exciter Modules.

6. Slowly turn the voltage control knob on the Synchronous Machine Exciter so that the

field current If (obtained from the Digital DCA Meter) is equal to 0.4 A. Then turn off

the Synchronous Machine Exciter.


Machine. Turn on the Synchronous Machine Exciter. Set the on-off switch on the

Four-Pole Switch Module to the ON position.


Three-Phase Salient Pole Synchronous Machine. The motor should rotate at its rated

speed of 1,800 rpm for 60-Hz power (1,500 rpm for 50-Hz power).

9. Manipulate the Brake Controller to operate in Mode\Closed Loop\Constant Torque

mode and set the output torque to each of the torque settings listed in Table 14-3-1. If

the Controller doesn’t operate normally, reboot it by pressing the RESET button. If the rotor of motor is locked by a heavy brake torque, turn off the power immediately.

10. Record the motor current I, motor voltage E, power P, and power factor cos θ values

displayed by the Digital Power Analysis Meter in Table 14-3-1.

11. Manipulate the Brake Controller to release the braking. That is to say, release the

braking by pressing the ESC or BACK button on the Brake Controller.

12. Repeat steps 3 through 11 for other settings of the field current If listed in Table 14-3-1.

Note: The motor current must not exceed 130% of the rated current,1.17A x 1.3 =

1.521A.

13. Sequentially turn off the Three-phase Power Supply, 3-P Current Limit Protection

Switch modules, Magnetic Powder Brake Unit and Brake Controller.

14-20

14. Plot I vs If curves at different torque settings in Fig. 14-3-3 using the results of Table

14-3-1

Table 14-3-1 Measured values of cos θ, I, E, and P

T (kg-m) If=0.4A If=0.35A If=0.3A If=0.25A If=0.2A If=0.15A If=0.1A If=0.05Acos θ I (A) E (V)

0


0.05


0.1

P (W)

－

cos θ I (A) E (V)

0.15

P (W)

－－

00.10.20.30.40.50.60.70.80.9

1

0 0.1 0.2 0.3 0.4 0.5

If(A)

I(A)

I(T=0)I(T=0.05)I(T=0.1)I(T=0.15)

Fig. 14-3-3 I vs If curves

14-21



T (kg-m) If=0.4A If=0.35A If=0.3A If=0.25A If=0.2A If=0.15A If=0.1A If=0.05Acos θ -0.312 -0.45 -0.77 0.57 0.33 0.238 0.188 0.175I (A) 0.338 0.212 0.116 0.153 0.271 0.4 0.59 0.72 E (V) 220 220 220 220 220 220 220 220

0

P (W) 40 36 34 33 34 37 43 48 cos θ -0.67 -0.8 -0.95 0.928 0.767 0.636 0.521 0.45 I (A) 0.462 0.366 0.32 0.333 0.4 0.507 0.63 0.8 E (V) 220 220 220 220 220 220 220 220

0.05

P (W) 123 115 102 115 114 124 128 134 cos θ -0.816 -0.901 -0.97 0.961 0.879 0.772 0.67 I (A) 0.64 0.57 0.521 0.52 0.59 0.73 0.942 E (V) 220 220 220 220 220 220 220

0.1

P (W) 200 197 196 197 202 213 219

－

cos θ -0.909 -0.96 -0.984 0.957 0.88 － I (A) 0.83 0.756 0.77 0.8 0.91 － E (V) 220 220 220 220 220 －

0.15

P (W) 294 290 286 296 307 －

－－

00.10.20.30.40.50.60.70.80.9

1

0 0.1 0.2 0.3 0.4 0.5

If(A)

I(A)

I(T=0)I(T=0.05)I(T=0.1)I(T=0.15)


14-22



T (kg-m) If=0.4A If=0.35A If=0.3A If=0.25A If=0.2A If=0.15A If=0.1A If=0.05Acos θ -0.306 -0.406 -0.575 -0.6 0.388 0.28 0.225 0.2 I (A) 0.44 0.3 0.2 0.19 0.31 0.46 0.64 0.8 E (V) 220 220 220 220 220 220 220 220

0

P (W) 54 50 47 46 47 51 56 65 cos θ -0.54 -0.682 -0.84 -0.894 0.763 0.573 0.482 0.413I (A) 0.6 0.46 0.36 0.33 0.39 0.54 0.67 0.87 E (V) 220 220 220 220 220 220 220 220

0.05

P (W) 129 124 120 118 119 122 127 141 cos θ -0.725 -0.823 -0.91 -0.94 0.863 0.737 0.65 I (A) 0.69 0.59 0.54 0.51 0.57 0.69 0.83 E (V) 220 220 220 220 220 220 220

0.1

P (W) 199 195 194 196 195 202 206

－

cos θ -0.79 -0.89 -0.953 0.955 0.895 0.788 I (A) 0.86 0.75 0.7 0.7 0.77 0.9 E (V) 220 220 220 220 220 220

0.15

P (W) 269 267 264 268 277 280

－－

00.10.20.30.40.50.60.70.80.9

1

0 0.1 0.2 0.3 0.4 0.5

If(A)

I(A)

I(T=0)I(T=0.05)I(T=0.1)I(T=0.15)


UNIT 14 Three-Phase Salient Pole Synchronous Motor€¦ · Three-phase Power Supply Module. 1....

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