Motor controller for vehicle air conditioner

摘要

PROBLEM TO BE SOLVED: To provide a motor controller for a vehicle air conditioner which recovers a reduced rotational speed of a motor without a sense of incompatibility.SOLUTION: At normal times, a microcomputer 32 uses as a target rotational speed, a command value input from an air conditioner ECU 82 and controls an inverter circuit 40 in such a manner that an actual rotational speed of a motor 52 becomes the target rotational speed. If a temperature of a substrate detected by a thermistor 54A becomes equal to or higher than a predetermined temperature threshold, the microcomputer controls the inverter circuit 40 in such a manner that the actual rotational speed of the motor 52 is reduced to a predetermined rotational speed, and if the temperature of the substrate becomes lower than the predetermined temperature threshold after the actual rotational speed is reduced, the microcomputer controls the inverter circuit in such a manner that the reduced actual rotational speed is accelerated to the command value with predetermined acceleration similar to a start-up time of the motor 52.SELECTED DRAWING: Figure 2