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Motor overload protection and open-phase protection detecting circuit

A technology of overload protection and phase loss protection, applied in emergency protection circuit devices, measurement devices, measurement devices, etc., can solve the problems of burning motor, winding temperature rise, motor overheating, etc., to achieve the effect of easy implementation and simple structure

Inactive Publication Date: 2011-11-02
SHANXI LUAN ENVIRONMENTAL ENERGY DEV
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Problems solved by technology

[0002] Due to the particularity of the underground environment of coal mines and the particularity of equipment operation, motor overload and phase loss faults often occur. Severe overheating will cause insulation aging, until breakdown, or even burn out, burn out the motor, so it is necessary to detect the overload operation and phase loss fault of the motor

Method used

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Embodiment Construction

[0014] Such as figure 1 As shown, the motor overload protection and phase loss protection detection circuit of the present invention includes: a rectification filter circuit, a potentiometer, a Zener diode, a diode, and a resistor. It is characterized in that: the input terminals a1 and a2 are two terminals of the first rectification filter circuit input ends, input ends a3, a4 are two input ends of the second rectification filter circuit 2, input ends a5, a6 are two input ends of the third rectification filter circuit 3, the first rectification filter circuit 1, the second rectification filter circuit The anodes of the filter circuit 2 and the third rectification filter circuit 3 are connected in parallel and then connected in series with a diode D19, a potentiometer W1 and a resistor R8 and then connected to the output terminal u1;

[0015] The negative poles of the first rectifying and filtering circuit 1 are respectively connected to the positive pole of the diode D18 and ...

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Abstract

The invention provides a motor overload protection and open-phase protection detecting circuit belonging to the technical field of protection and control for motors. The technical problem to the solved is to provide a circuit for detecting overload and open-phase fault of a motor. The technical scheme is as follows: positive poles of a first rectifier filter circuit, a second rectifier filter circuit and a third rectifier filter circuit are connected in parallel, then connected in series with a diode D19, a potentiometer W1 and a resistor R8 and connected to an output end u1; the negative pole of the first rectifier filter circuit is connected to the positive pole of a diode D18 and the negative pole of a diode D15; the negative pole of the second rectifier filter circuit is connected to the positive pole of a diode D17 and the negative pole of a diode D14; the negative pole of the third rectifier filter circuit is connected to the positive pole of a diode D16 and the negative pole of a diode D13; and the positive pole of a voltage-stabilizing diode D22 is connected in series with a diode D21 and the resistor R6 and then connected to an output end u2. The invention is further used in the coal mine field.

Description

technical field [0001] The motor overload protection and phase loss protection detection circuit of the invention belongs to the technical field of motor protection and control. Background technique [0002] Due to the particularity of the underground environment of coal mines and the particularity of equipment operation, motor overload and phase loss faults often occur. Severe overheating will cause the insulation to age until it breaks down, or even burns and burns the motor. Therefore, it is necessary to detect the overload operation and phase loss fault of the motor. Contents of the invention [0003] The invention overcomes the deficiencies in the prior art, and the technical problem to be solved is: to provide a motor overload protection and phase loss protection detection circuit for detecting the motor overload operation and phase loss fault. [0004] In order to solve the above technical problems, the technical solution adopted in the present invention is: motor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/085H02H7/09G01R31/02
Inventor 崔根伟白宏峰崔智明田文科连朝阳刘文利姜宁任国伟
Owner SHANXI LUAN ENVIRONMENTAL ENERGY DEV
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