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Protection circuit for electric motor

A technology for protecting circuits and motors, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as high production costs, single-phase AC motors and DC motors cannot protect, and DC motors cannot be protected

Inactive Publication Date: 2008-05-14
BENGBU CITY BORUI PRECISION MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the existing technology, there are thermal relays, automatic switches, universal current-limiting circuit breakers, and integrated motor protectors for motor protection, but most of them have complex structures, high production costs, and cannot protect DC motors, etc.
For example, a BHQ (JD-5 / 5D-6) motor protector can only protect three-phase AC motors, but cannot protect single-phase AC motors and DC motors.

Method used

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  • Protection circuit for electric motor
  • Protection circuit for electric motor
  • Protection circuit for electric motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] The motor protection circuit shown in Figure 2 or Figure 3, when the motor can work normally, at the moment of starting, a voltage control signal that changes from high to low will be generated on the sampling circuit 1, (the control signal can be Adjust its amplitude through the adjustable resistor 19 to adapt to the working requirements of the subsequent stage circuit) This signal is divided into two routes, which are transmitted to the first rectifier circuit 2 and the second rectifier circuit 3 respectively (the rectifier circuit can choose a rectifier diode with low voltage drop ), the output terminal of the first rectifier circuit 2 is connected in parallel with a first capacitor 4, the first capacitor 4 has two functions here, one is a filter capacitor for the control signal, and the other is to form an RC first capacitor with the first resistor 6 A delay circuit 20; a second filter capacitor 5 and a load resistor 7 are connected in parallel to the output terminal...

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Abstract

An electromotor protective circuit includes the sampling circuit, rectifying circuit, delay circuit, comparison circuit and control circuit. The sampling circuit picks up the current variance of power supply circuit of the electromotor as the control signal and transfers it into two rectifying circuits in two paths. The control signal outputted by the rectifying circuit of one path is inputted to the same comparison circuit with the through connect signal outputted by the rectifying circuit of the other path. Then the comparison circuit output a control signal to control the on and off of the power supply circuit by electromotor. The circuit is featured by simple principle, reliable performance, suitable to single-phase, three-phase alternating electromotor and direct current motor and low producing cost.

Description

technical field [0001] The invention relates to a motor protection circuit, in particular to a method for avoiding the accident of burning the motor coil due to the inability of the rotor to rotate after the motor is energized. Background technique [0002] At present, in the prior art, there are thermal relays, automatic switches, universal current-limiting circuit breakers, and comprehensive motor protectors for motor protection, but most of them have complex structures, high manufacturing costs, and cannot protect DC motors. For example, a BHQ (JD-5 / 5D-6) motor protector can only protect three-phase AC motors, but cannot protect single-phase AC motors and DC motors. SUMMARY OF THE INVENTION [0003] The object of the present invention is to provide a motor protection circuit with simple circuit and applicable to the protection requirements of various types of motors. [0004] In order to achieve the above object, the motor protection circuit of the present invention in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08
Inventor 田永茂
Owner BENGBU CITY BORUI PRECISION MACHINERY MFG CO LTD