Over-temperature protection device for electric machine, electric machine and over-temperature protection method thereof
An over-temperature protection and power supply technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as poor protection reliability, and achieve the effects of low false protection rate, good protection timeliness, and improved reliability and safety.
Pending Publication Date: 2018-12-21
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology
[0004] The object of the present invention is to address the above defects, to provide an over-temperature protection device for a motor, a motor and an over-temperature protection method thereof, so as to solve the problem of poor protection reliability in the prior art by controlling the switch of the triode to perform over-temperature shutdown protection. problems, to achieve the effect of improving the reliability of protection
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[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0028] According to an embodiment of the present invention, an over-temperature protection device for a motor is provided, such as figure 1 A schematic structural view of an embodiment of the device of the present invention is shown. The over-temperature protection device of the motor may include: a thermistor 102 (such as NTC resistor, PTC resistor, etc.), a vol...
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The invention discloses an over-temperature protection device of an electric motor, an electric motor and an over-temperature protection method thereof. The device comprises a thermistor, which is used for sensing the current temperature of a switch tube of the electric motor; aA voltage dividing resistor connectred in series with the thermistor to form a voltage dividing branch for a preset powersupply so as to realize voltage dividing control of the voltage stabilizing unit and the control switch; a voltage stabilizing unit configured to, when the current temperature reaches a preset over-temperature protection point of the switch tube, be in an off state to control the control switch to be turned on in conjunction with the voltage dividing branch to output a low-level signal to a controller of the motor to cause the controller to control the motor to be stopped according to the low-level signal. The scheme of the invention can solve the problem of poor protection reliability existing in the over-temperature shutdown protection by controlling the switch of the transistor in the prior art, so as to achieve the effect of improving the protection reliability.
Description
technical field [0001] The invention belongs to the technical field of temperature protection, and in particular relates to an over-temperature protection device for a motor, a motor and an over-temperature protection method thereof, in particular to a high-precision over-temperature protection circuit, a motor with the over-temperature protection circuit, and the motor over-temperature protection method. Background technique [0002] Because the brushless DC motor has the characteristics of high efficiency, large starting torque, and convenient control, its application fields are becoming wider and wider. The brushless DC motor is mainly composed of two parts: the motor body and the controller. The controller part includes a control chip, a power drive circuit, a position detection circuit, signal feedback and other circuits; the power drive circuit is generally composed of a signal amplifier circuit and a full-bridge (or half-bridge) inverter circuit, and the switching tu...
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Login to View More IPC IPC(8): H02H7/085
CPCH02H7/0852
Inventor 张晓菲敖文彬马连康郭春林
Owner GREE ELECTRIC APPLIANCES INC