Feeding back the temperature of the power switching device, the method of controlling the torque of motor drive dynamically

摘要

At the time of overheating temperature condition being the switching device inside the motor controller circuit (16) on the basis of temperature, by controlling motor torque dynamically, the circuit and the method of doing the operation of the motor without break. The circuit (20), when the electric current feedback signal in order to presume the temperature of the switching device or the temperature of the said switching device temporarily, it is under the value which is decided beforehand, when fixed limit value, on the other hand, temporarily temperature or the aforementioned electric current feedback signal of the aforementioned switching device it exceeds the value which the description above beforehand is decided, the variable limit value which is inversely proportional to the aforementioned temperature signal (14) torque electric current is limited to in each case. Therefore, regarding overheating temperature condition, the particular motor to continue, it operates, but because it decreases torque, it is possible to cool the aforementioned switching device.