Electric Drives 7,5 hp


The overall aim of the course is to provide an understanding of the design, modeling and assessments of electric drive systems, primarily for a hybrid or electric vehicle application. The course will provide a deep understanding of electric machines: steady-state, and (for the dc-, induction and the permanent magnet synchronous machine) dynamic performance with speed and current control including relevant theory. 

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Entry requirements 

Undergraduate profile: Major in Electrical engineering, Automation and mechatronics engineering or Engineering physics 

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Course examiner Ass professor Sonja Lundmark Chalmers University of Technology, Department of Energy and Environment Division of Electric Power Engineering E-mail; sonja.lundmark@chalmers.se


The dc motor drive is used as a model example for other drives. Power electronics converters and control theory relevant to the electric drive systems in hybrid or electric vehicles are also treated. Further, an electric vehicle propulsion drive system is introduced and modeled, using field vector control, including vehicle dynamics, and performing simulations after a given drive cycle. The student is encouraged to consider environmental aspects, such as energy-efficient drive systems.


The course comprises of about 13 lectures, 9 tutorials, two practical laboratory exercises (2 x 2 h)and two computer labs. There is also a (not obligatory) trial exam. You are also expected to participate in discussion forums, regarding homework assignments in conjunction with some lectures.


1. Introduction; Course information, introduction to motor drive systems in vehicles, the demands on the electrical machine in an electric or hybrid vehicle, revision of electrical machines basics

2. DC machines and experimental work introduction; dc motor components, commutation,speed control options, armature reaction, 4-quadrant operation and regenerative braking,losses

3. DC machines and experimental work introduction continuation and dc-computer lab introduction; Drives performance (controller and converter added), speed and current control and digital controlled drives

4. Drive systems in electric and hybrid electric vehicles; Introduction to the drive system to be modeled in computer lab 2 and 3, power electronic converters, pulse width modulation

5. Synchronous machines; Rotating field, alignment torque and reluctance torque, pm synchronous motors, the switched reluctance machine, the synchronous reluctance machine (assessments, design criteria and mode of operation)

6. Permanent magnets and permanent magnet drives; permanent magnets characteristics and safety, materials, locations in the machine, effects of demagnetizing fields

7. Permanent magnets and permanent magnet drives, including the brushless dc machine;brushless dc motor principle of operation, torque and emf calculations, torque-speed characteristics, special brushless dc machines (the axial flux and the transverse flux machines)

8. The asynchronous machine; components, comparison to dc-machines and synchronous machines, operation (torque-speed curves, current-speed curves, rotor parameter and voltage reduction effects on maximum torque capability, speed control possibilities), demo of a machine direct start

9. Core fabrications, core loss and windings

10. General design aspects and motor drive selection criteria

11. The permanent magnet synchronous machine (PMSM) control; transformation to d-q system, machine equations, field oriented vector control, introduction to computer lab 2 and 3

12. PMSM control continuation; Modelling of the drive system used in computer lab 2 and 3, performance, loss, efficiency

13. PMSM control continuation; Torque control with vehicle included (first as extra inertia and then including mechanical dynamics) and considering a drive cycle (NEDC) Field-oriented control of the induction motor

14. Field-oriented control of the induction motor


Electric Motors and Drives (2006), by A Hughes published by Newnes, Elsevier, 3 ed, ISBN-13:987-0-7506-4718-2

Cancellation policy: 

Full refund of educational program/course fees will be made for reservations cancelled no later than eight weeks prior to the start of the program/course. Later cancellations incur a cancellation fee as follows:

  • 2 weeks or less prior to program start 100% of the educational program/course fee
  • 2-4 weeks prior to program start 50% of the educational program/course fee
  • 4-8 weeks prior to program start 25% of the educational program/course fee, for educations in the Shipping area: 0% of the educational program/course fee

We are always willing to consider a colleague as a substitute for the original applicant. Cancellation and postponement must be made in writing. Cancellation of accommodation is subject to the cancellation policies of the hotels.