Design of Basic Electro-mechanical Devices

Instructors: Professor Dennis K. LieuDepartment of Mechanical EngineeringUniversity of California, Berkeley, USA(Tel) 510-642-4014(Email) dlieu@newton.berkeley.edu

Description

Fundamental principles of magnetics, electro-magnetics, and magnetic materials as applied to design and operation of electro-mechanical devices. Applied magnetic theory: magnetic motive force, permeance, flux, intensity, leakage. Properties of magnets and magnetic materials. Principles of operation of basic electro-mechanical devices and their drivers. Design of actuators and motors to meet force, torque, back EMF, and capacity requirements. Type and dimensional synthesis and material specification for custom applications of linear and rotary actuators, stepper motors, and DC brushless motors. Specification of poles, phases, winding patterns, and impedance.

Day 1:

Introduction. Review of fundamental magnetics theory.Maxwell's Equations: Faraday's Law, Ampere's Law, Gauss' Law.Lumped parameter models. MMF. Reluctance and permeance.Flux linkages, speedance, inductance.Energy and co-energy conversion. Maxwell's stress tensor. Forces and torques.Properties of permanent magnets. Magnetizing process.

Day 2:

Simple reluctance devices.Operation and control of voice coil actuators.Brushless motors. Torque generation, timing, and commutationDelta and Y windingsMotor control using switched DC. H-bridge controllers.Use of HED's and FET's.

Day 3:

Losses and efficiency. Thermal considerations.Insulation ratings. UL standardsPermanent magnet and VR stepper motors, pull-in and pull-out torque.Magnetic circuit equivalents and permeance based calculation of torque.Hybrid stepper motors. Magnetic circuit equivalents.

Textbook Design of Basic Electro-Mechanical Devices (UB Berkeley ME229 Class Note)

Reference TextbooksMagnetic Fundamentals and Motion Devices, H.D. Chai, Prentice Hall Handbook of Electric Machines, S.A. Nasar; McGraw-HillElectro-mechanical Motion Devices, P.C. Krause, O. Wasynczuk; McGraw-HillElectro-magnetics, J.D. Kraus; McGraw-HillElectricity and Magnetism, E.M. Purcell; McGraw-Hill

Electromechanical Dynamics, Part I: Discrete Systems - H. H. Woodson and J. R. MelcherDate March 28-30 2001

ScheduleRegistration : 8:30 -9:00 am first dayLecture : 8:30 am – 5 pm each dayLunch : Noon- 1 pm each dayBanquet : 5:30 –7:30 pm March 30

Class Room 218 (Multimedia Room) New Material Engineering BuildingHanyang University, Seoul, Korea

Registration Fee 500,000 Won (US$400), 50 % off for the graduate students Class note, lunch and banquet included

Registration DeadlineMarch 16 2001

To register the shortcourse, contact Program Administrator Yunjoo ChoThe BK21 Division for Research and Education in Mechanical Engineering,Hanyang University17 Haengdang-dong, Seongdong-kuSeoul, 133-791, Korea(Tel) 82-2-2290-1263(Fax) 82-2-2299-1485(Email) mebk22@email.hanyang.ac.kr

To have the course information, contactProfessor Gunhee JangDepartment of Mechanical Engineering, Hanyang University17 Haengdang-dong, Seongdong-kuSeoul, 133-791, Korea(Tel) 82-2-2290-0431(Fax) 82-2-2292-3406(Email) ghjang@email.hanyang.ac.kr(URL) http://prem.hanyang.ac.kr http://www.me.berkeley.edu/prem