| Abstract |
To maximise the performance of a d.c. brushless motor the associated electronic commutator usually incorporates a current control loop designed to provide an optimum drive
current waveform. An alternative approach is to employ commutation techniques that do not require the direct control of current. This eliminates the costs normally associated with current
control and reduces some of the problems related to high frequency switching such as electromagnetic interference and switching loss. However, with the loss of current control,
performance is expected to deteriorate. This wqrk reports the investigation into alternative commutation strategies intended to compensate for removal of the current control loop. The results, via simulation, indicate that although performance compatible with conventional schemes could not be achieved it was possible via the choice of appropriate commutation strategy(s) to achieve levels of performance acceptable to many applications. |
