Controller for motor

A controller for a permanent magnet field motor comprising a first rotor and a second rotor concentrically provided around a rotating shaft and a phase changing device for changing an angle of relative displacement in a circumferential direction between the first rotor and the second rotor to serve as a power source for driving driven wheels of an all-wheel drive vehicle having two main driving wheels and at least two driven wheels,

• the controller comprising:
• a drive control portion to control driving of the motor according to a drive mode of the all-wheel drive vehicle;
• an accelerator-opening sensor to detect an accelerator-opening indicating a degree of a driver's operation performed on an accelerator of the all-wheel drive vehicle;
• and
• a phase instruction portion to issues an instruction, when the accelerator-opening detected by the accelerator-opening sensor is larger than a predetermined value, to cause the drive control portion to drive the motor and to set the drive mode of the all-wheel drive vehicle to be an all-wheel drive mode in which the all-wheel drive vehicle is driven by the main driving wheels and the drive wheels so as to set an angle of relative displacement at an angle at which a magnetic flux generated at each of the first and second rotors is strengthened, as compared with that generated at each of the first and second rotors in a main-driving-wheel drive mode in which the all-wheel drive vehicle is driven only by the main driving wheels.