Patent ID: 8013565
Filing Date: 2011-09-06
Classification: G01K,H02P

Abstract:
1. A motor control device for operating a motor having a stator with a stator coil concentrically arranged on an outer side of a rotor having a permanent magnet, the motor control device comprising: magnet temperature estimating means for estimating a temperature of the permanent, magnet; and control means for controlling the motor based on the estimated magnet temperature, wherein the motor includes: the magnet temperature estimating means predetermines a thermal resistance ratio which is given by comparing a thermal resistance between the cooling liquid and the stator coil with a thermal resistance between the stator coil and the permanent magnet, the magnet temperature estimating means also predetermining a heat production ratio between the stator coil and the permanent magnet, and during operation of the motor, the magnet temperature is calculated based on the temperature of the stator coil and the cooling liquid, the heat production ratio, and the thermal resistance ratio.