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dc.contributor.advisorBurton, Bruce.
dc.creatorShields, Bradley.
dc.date.accessioned2014-10-29T09:17:38Z
dc.date.available2014-10-29T09:17:38Z
dc.date.created2014
dc.date.issued2014
dc.identifier.urihttp://hdl.handle.net/10413/11375
dc.descriptionM. Sc. Eng. University of KwaZulu-Natal, Durban 2014.en
dc.description.abstractThis thesis begins with a literature review focusing on electric vehicle (EV) applications. Systems used for steering, braking and energy storage are investigated, with specific concentration on torque control in various DC and AC motors commonly used in EVs. A final solution for a low range personal transportation EV in the form of a wheelchair is proposed. The theme for this thesis is motion control, focusing on a two axis (or two wheel drive) brushless DC hub motor (BLDCHM) EV, with torque and direction control tracking a user reference. The operation principle for a BLDCHM is documented and the dynamic and electrical equations derived. Simulation results for motor response under different load and speed conditions are compared to practical measurements. Current and torque control loops are designed, implemented and tuned on a single-axis test-bed with an induction motor (IM) load coupled via a torque transducer. A Texas Instrument DSP development kit is used for the control algorithm bench testing. The final control algorithm is then duplicated and expanded in simulation to form a dynamic two axis system for an electric wheelchair. It incorporates both motor drive and regenerative capabilities. After demonstrating two axis controls for BLDCHMs, a control algorithm is designed simulated and compared to traditional systems. The final solution focuses specifically on an intuitive response to the driver input whilst maintaining direction tracking, even when there is a difference in smoothness of the individual terrains traversed by the left and right wheels. In addition the motor drives are equipped with controllers that ensure regenerative braking in order to recover as much energy as possible when the wheelchair is commanded to decelerate.en
dc.language.isoen_ZAen
dc.subjectBrushless direct current electric motors.en
dc.subjectTorque.en
dc.subjectElectric vehicles.en
dc.subjectDigital control systems.en
dc.subjectTheses--Electrical engineering.en
dc.titleTwo-axis torque control of BLDC motors for electric vehicle applications.en
dc.typeThesisen


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