| Abstract |
Recent progresses in power electronic device, rare-earth permanent magnet (PM) and modern
motor control technology have made it possible for interior permanent magnet synchronous motor
(IPMSM) to find wider application. In the applications which require operation ability above base
speed, such as electric vehicles and compressors, except for large torque performance at low
speed, high efficiency in extensive constant-power operating range is also desired. A new method
to extend the operating range as well as to improve efficiency of IPMSM with adjustable PM
armature flux linkage by means of adapting flux-shortening iron plates is proposed in this paper.
The performance of the proposed IPMSM is studied by simulation and experiments. It shows that
the operating range of the proposed IPMSM can be greatly extended by lowering the PM armature
flux level with the iron plates. In flux-weakening control area, due to the possibility of decreasing
the PM armature flux linkage, the proposed IPMSM requires less d-axis armature current.
Therefore the efficiency can be improved, especially at light load and high speed operation. |
