Motor and motor protection method

An isolation protection, circuit technology, applied in emergency protection circuit devices, electrical components and other directions, can solve the problems of power tube breakdown, DC motor winding insulation damage, etc., to achieve the effect of rapid braking
CN106549362AInactive Publication Date: 2017-03-29QINGDAO HAIER TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
QINGDAO HAIER TECH
Publication Date
2017-03-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention proposes a motor and a motor protection method. The method comprises the steps of arranging a discharging braking circuit and a detection control circuit between a motor switch power supply and the motor; and monitoring whether the motor is powered off or not by the detection control circuit, if yes, controlling the discharging braking circuit to discharge energy of a self-induced electromotive force and a counter electromotive force of the motor. By the motor and the motor protection method, an electrolytic capacitor at a front end can be prevented from being charged by the self-induced electromotive force and the counter electromotive force which are generated during stopping rotation of a DC motor, the system switch power supply is prevented from being started again after stopping working, the self-induced electromotive force and the counter electromotive force which are generated during stopping rotation of the motor can be converted to heat energy and are rapidly released, and rapid braking of a draught fan is achieved.
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Description

technical field

[0001] The invention relates to the technical field of motors, in particular to a motor and a motor protection method. Background technique

[0002] At present, when the brushless DC motor is directly powered off, the self-induced electromotive force of the brushless DC motor and the back electromotive force generated by the fan blade of the brushless DC motor during the rotation process after power failure will generate high voltage, and the high voltage will Charging other peripheral circuits of the brushless DC motor will cause the switching power supply of the brushless DC motor system to restart, and even damage the internal components of the DC motor.

[0003] For example: if figure 1 As shown, the brushless DC motor switching power supply circuit transmits the high-voltage DC power supply 310V generated by the AC mains 220V after being rectified by the rectifier to the brushless DC motor, which is used as the power input of the brushless DC fan and al...

Claims

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