Patent ID: 7538510
Filing Date: 2009-05-26
Classification: H02P

Abstract:
1. A controller for a motor adapted to control an operation of a permanent magnet field type rotary motor having a first rotor and a second rotor, which have a plurality of fields made of permanent magnets and which are disposed around a rotating shaft, by field control carried out by changing a rotor phase difference, which is a phase difference between the first rotor and the second rotor, the controller comprising: an inverter circuit which converts DC power supplied from a DC power source into multiphase AC power to be supplied to an armature of the motor; rotor phase difference changing means which changes the rotor phase difference; DC voltage changing means which changes an output voltage of the DC power source; and voltage-between-terminals increasing means which carries out at least one of first processing for increasing a voltage between terminals to change the rotor phase difference in a direction for reducing the magnetic fluxes of fields of the motor by the rotor phase difference changing means and second processing for increasing a voltage between terminals to increase an output voltage of the DC power source by the DC voltage changing means in the case where the magnitude of a resultant vector of the voltages between terminals of armatures of individual phases of the motor exceeds a target voltage which has been set to be not more than an output voltage of the DC power source.