Gree Electric Appliances, Inc. of Zhuhai

Wenxian Wu

Bin Chen

Weilin Guo

Shengyu Xiao

Xiaofei Zhang

Anyong Hu

Lina Yao

Wenbin Ao

Yanzhang Wang

A method and a system for detecting a logic level of a rotor of a motor, and a motor are disclosed. The method comprises: obtaining an analog voltage output by a position sensor for a winding of the motor; setting a first commutation voltage and a second commutation voltage; generating a logic level according to the analog voltage, the first commutation voltage and the second commutation voltage; and performing angle correction on the logic level according to a first angle corresponding to the first commutation voltage and a second angle corresponding to the second commutation voltage. The first commutation voltage is a commutation voltage for triggering a rising edge, and the second commutation voltage is a commutation voltage for triggering a falling edge. This method may accurately identify the logic level corresponding to the motor rotor, improve uniformity of a commutation voltage and prevent fluctuations in motor speed.

Method and system for detecting logic level of rotor of motor, and motor

Provided are a protection circuit for a brushless DC motor, and a control device. The protection circuit is applied to a control device for a brushless DC motor, the control device including a main control chip and a protection circuit for driving a brushless DC motor. The protection circuit includes a sampling signal input end (RNF), a first resistor (R), a first capacitor (C), a second capacitor (C), a comparator (IC) and a switching element (IC), connected together in a preset structure.

Protection circuit for brushless DC motor, and control device

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Guangdong, China

Wenxian Wu