An Overload Protection Circuit for Switched Reluctance Motor

Abstract

The invention discloses an overload protection circuit for a switch reluctance motor. The overload protection circuit comprises a current detection circuit, a first reference voltage generation circuit, a signal processing circuit, an overload protection signal formation circuit, a second reference voltage generation circuit and an overload protection control circuit. The current detection circuit detects a phase current of the switch reluctance motor and outputs a signal voltage; the signal processing circuit receives the signal voltage and compares the signal voltage with a first reference voltage generated by the first reference voltage generation circuit; when the signal voltage is greater than the first reference voltage, a deviation voltage signal is outputted; the overload protection signal formation circuit processes the deviation voltage signal and then outputs an overload protection voltage signal; the overload protection control circuit receives the overload protection voltage signal and compares the overload protection voltage signal with a second reference voltage generated by the second reference voltage generation circuit; and when the overload protection signal voltage is larger than the second reference voltage, an overload protection control signal is outputted to a switch reluctance motor controller so as to realize overload protection.

Description

technical field [0001] The invention relates to an overload protection circuit, in particular to an overload protection circuit for a switched reluctance motor. Background technique [0002] Switched reluctance motors may sometimes be overloaded during operation. When the motor is overloaded, its phase current will often exceed its rated current, which will increase the calorific value of the motor winding and the temperature rise of the winding will rise rapidly. If the motor grows Time overload operation may cause the winding temperature to rise to an extremely high value, and even burn the motor winding in severe cases, causing irreparable losses. Therefore, it is very important to set up overload protection for switched reluctance motors. However, there is still a lack of effective protection measures for the overload phenomenon that occurs during the operation of the switched reluctance motor, which leaves hidden dangers for the safe operation of the switched reluctance...

AI Technical Summary

Problems solved by technology

[0002] Switched reluctance motors may sometimes be overloaded during operation. When the motor is overloaded, its phase current will often exceed its rated current, which will increase the calorific value of the motor winding and the temperature rise of the winding will rise rapidly. If the motor grows Time overload operation may cause the winding temperature to rise to an extremely high value, and even burn the motor winding in severe cases, causing irreparable losses, so it is very important to set overload protection for switched reluctance motors

However, at present, there is still a lack of effective protection measures for the overload phenomenon that occurs during the operation of the switched reluctance motor, which leaves hidden dangers for the safe operation of the switched reluctance motor.

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