MOTOR CONTROL SYSTEMS

Three motor control systems for an electric road vehicle are discussed. The first system is based on a DC machine. To gain the required drive characteristics from the motor, both the field and armature circuits were driven independently by transistor "chopper" circuits. To regulate the torque output of the machine the armature current is directly controlled by the electronic circuitry, rather than the armature voltage. This gives the advantage of direct torque control and ensures that the armature current is kept within defined levels despite machine loading. The system also incorporates regenerative braking with the torque again being controlled via the armature current. The technique adopted for the regenerative braking system allows the braking torque to be maintained down to very low motor speeds. The second and third systems developed are based on an AC motor. Both systems rely on a variable frequency, variable current, DC to AC three phase inverter for the motor power supply. Again, the approach taken to regulate the motor torque was to directly control the motor winding currents. Regenerative braking was also included in the drive system. Power transistors were again used as the switching devices for the inverter. The initial approach to the realisation of the control electronics was conventional hardwired analogue and digital circuitry. However due to the flexibility and potential of the microprocessor, a dual processor system was also developed. The thesis provides a comparison between the two approaches and the relative merits of each. The thesis was submitted for examination for the degree of Doctor of Philosophy. (Author/TRRL)

  • Corporate Authors:

    Monash University

    Wellington Road
    Clayton, Victoria  Australia  3800
  • Authors:
    • PALMER, R
  • Publication Date: 1980-12

Media Info

  • Pagination: n.p.

Subject/Index Terms

Filing Info

  • Accession Number: 00381092
  • Record Type: Publication
  • Source Agency: ARRB
  • Report/Paper Numbers: Monograph
  • Files: ITRD, TRIS, ATRI
  • Created Date: Mar 30 1984 12:00AM