High-capacity-motor slow-starting protective device

A protection device and a slow technology, applied in emergency protection circuit devices, circuit devices, starters of single multi-phase induction motors, etc., can solve the problems of reduced service life of the motor, large starting current of the motor, and burnout of the motor, etc., and achieve improvement Work efficiency, prolong service life, avoid burnout effect

Inactive Publication Date: 2014-04-09
SICHUAN KINGSCHEME INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] For a circuit with a high-power motor as a load, because the motor has a large power and low resistance value, the resistance value in the cold state is lower before it i

Method used

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  • High-capacity-motor slow-starting protective device

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with accompanying drawing:

[0011] As shown in the drawings: the present invention includes an AC power supply, a rectifier circuit, a bidirectional thyristor SCR, a unijunction transistor BT, a transformer B, a sliding rheostat W, a voltage regulator tube DW, a fifth diode D5, a first resistor R1, a second The resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the first capacitor C1 and the second capacitor C2, the input end of the rectifier circuit is connected to the AC power supply, and the anode of the rectifier circuit is connected to the first The first end of a resistor R1 is connected, and the second end of the first resistor R1 is simultaneously connected with the negative pole of the Zener tube DW, the positive pole of the fifth diode D5 and the first end of the fifth resistor R5, and the fifth diode The negative pole of D5 is connected with the first ter...

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Abstract

The invention discloses a high-capacity-motor slow-starting protective device which includes a motor, an AC power supply, a rectifying circuit, a bidirectional SCR, a unijunction transistor, a transformer, a sliding rheostat, a voltage-stabilizing tube, a fifth diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor and a second capacitor. The protective device undergoes current limiting and voltage stabilization by the first resistor after being rectified by the rectifying circuit and then charges the high-capacity capacitors and delays gradual increasing of an opening angle of the bidirectional SCR by triggering pulses through discharge capacity of the sliding rheostat to the unijuction transistor. Even if the resistance of the sliding rheostat is adjusted to the minimum, the bidirectional SCR does not switch on completely immediately so that a soft-starting objective is achieved. Through adjustment of the sliding rheostat, soft starting speed of the motor can be changed. Through adoption of the soft starting, the high-capacity-motor slow-starting protective device is capable of limiting impulse current of a refrigeration motor so that motor burning is prevented, service life of the motor is prolonged and inconvenience brought to work by motor burning is reduced.

Description

technical field [0001] The invention relates to a motor controller device, in particular to a slow start protection device for a high-load motor. Background technique [0002] For a circuit with a high-power motor as a load, because the motor has a large power and low resistance value, the resistance value in the cold state is lower before it is turned on, and the starting current of the motor is very large. Sudden start may cause the phenomenon of burning out the motor, causing the motor to burn out. reduced service life. Contents of the invention [0003] The object of the present invention is to provide a slow start protection device for a high-load motor in order to solve the above problems. [0004] The present invention achieves the above object through the following technical solutions: [0005] The invention includes a motor, an AC power supply, a rectifier circuit, a bidirectional thyristor, a unijunction transistor, a transformer, a sliding rheostat, a volt...

Claims

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Application Information

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IPC IPC(8): H02H9/02H02P1/26
Inventor 李理陈果累谯石
Owner SICHUAN KINGSCHEME INFORMATION TECH
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