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Reduced-voltage starting control system

A starting control and autotransformer technology, which is applied to the starter, motor generator/starter, etc. of a single polyphase induction motor, can solve the problems of large mechanical impact, poor smoothness, and few starting stages, and achieves The effect of reducing impact, good starting smoothness and reducing mechanical impact force

Active Publication Date: 2015-09-16
昇辉智能科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing auto-coupling step-down start-up control system has problems such as a small number of start-up stages, secondary inrush current and impact torque during the start-up process, poor smoothness, large mechanical impact, and shortened service life.

Method used

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  • Reduced-voltage starting control system

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Embodiment Construction

[0010] A step-down start control system, refer to figure 1 , Is the three-phase alternating current L11, L12, L13 through the circuit breaker QF respectively connected to the inlet end of the contactor 3KM main contact, the inlet end of the contactor 1KM main contact, the outlet end of the contactor 3KM main contact through the thermal relay FR is connected to the three-phase motor M and the three intermediate taps of the autotransformer QZB. The outlet end of the main contact of the contactor 1KM is connected to the power supply end of the autotransformer QZB, so that the contactor 3KM, thermal relay FR and contactor 1KM, autocoupling The transformer QZB is connected in parallel, the other end of the autotransformer QZB is connected to the inlet end of the 2KM main contact of the contactor, and the outlet end of the 2KM main contact of the contactor is shorted together;

[0011] The L11 of the three-phase alternating current is connected in series with the fuse FU1 and then the ...

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Abstract

The invention discloses a reduced-voltage starting control system. According to the invention, a circuit breaker QF, a contactor 1KM, a contactor 2KM, a contactor 3KM, an autotransformer QZB, a thermal relay FR and a motor form a starting main circuit. A time delay 2KT is arranged in the starting control circuit. After the full-voltage contactor 3KM starts to work, contacts of the time delay relay 2KT are disconnected in a time delay manner, so that a coil of the contactor 1KM on a power terminal of the autotransformer QZB loses power and the main contacts become off-contact and quits the starting process. The electric motor is totally detached from the autotransformer QZB and operates normally in full voltage. The reduced-voltage starting control system has characteristics of large starting stage quantity, small impact current and impact torque, good in smoothness and small in mechanical impact.

Description

Technical field [0001] The invention belongs to the technical field of motor starting control equipment, and in particular relates to a control system for motor auto-coupling step-down starting. Background technique [0002] The auto-transformer is used to reduce the starting voltage added to the stator winding of the motor when the motor is started. After the motor is started, the motor is separated from the auto-transformer, so as to operate normally under full voltage. Auto-coupling step-down start-up is a very mature technology. Because auto-coupling start-up is simple, easy to maintain, does not require high working environment, has very strong practicability and low price advantage, it has been widely used. It can effectively reduce the starting current, protect the motor, and reduce the impact on the grid. [0003] The existing self-coupling step-down starting control system has problems such as few starting stages, secondary shock current and shock torque during starting, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P1/26
CPCH02P1/26
Inventor 徐克峰于相勇徐亚宁苏现府王新玲王修洋
Owner 昇辉智能科技股份有限公司
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