Asynchronous motor soft starter based on single-chip microcomputer

A technology of asynchronous motor and soft starter, applied in the field of soft start, which can solve problems such as large starting torque, reduced service life of the motor, overheating of the motor, etc., and achieves the advantages of small impact torque and impact current, simple control and high reliability Effect

Inactive Publication Date: 2015-05-20
合肥誉联信息科技有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of full-voltage direct starting is that the starting equipment and operation are the simplest, and the starting torque is larger than that of step-down starting; its disadvantage is that the inrush current generated during starting is 2 to 7 times its rated current, which will cause: ( 1) The instantaneous drop and violent fluctuation of the grid voltage will affect the normal operation of other motors or electrical equipment on the same network; (2) The impact current will cause the local temperature of the motor to rise, and the motor will overheat when it is started frequently, reducing the service life of the motor; (3) The mechanical impulse generated will accelerate the wear of mechanical transmission parts; (4) The impact current will also interfere with th

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  • Asynchronous motor soft starter based on single-chip microcomputer
  • Asynchronous motor soft starter based on single-chip microcomputer
  • Asynchronous motor soft starter based on single-chip microcomputer

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Embodiment Construction

[0021] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0022] Such as figure 1 As shown, the soft starter for an asynchronous motor based on a single-chip microcomputer includes a main circuit 1 and a control circuit 2. The main circuit 1 and the control circuit 2 are connected to a three-phase power supply 3. The main circuit 1 consists of three groups of anti-parallel thyristors 11 and a bypass contactor 12. Composed of a current transformer 13, the control loop 2 is composed of a single-chip microcomputer 21 and a power supply circuit 22 connected thereto, a voltage synchronization signal detection circuit 23, a pulse trigger circuit 24 for generating a thyristor gate trigger signal, a current detection circuit 25, and a voltage detection circuit 26. LCD display and keyboard circuit 27, contactor control circuit 28, state output circuit 29 and protection circuit 210, single-chip micro...

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Abstract

The invention relates to an asynchronous motor soft starter based on a single-chip microcomputer. The asynchronous motor soft starter comprises a main loop and a control loop, wherein the main loop and the control loop are connected with a three-phase power supply; the main loop consists of three groups of anti-parallel thyristors, a bypass contactor and a current transformer; the control loop consists of the single-chip microcomputer, a power supply circuit connected with the single-chip microcomputer, a voltage synchronization signal detection circuit, a pulse trigger circuit for generating a thyristor gate trigger signal, a current detection circuit, a voltage detection circuit, an LCD (Liquid Crystal Display) display and keyboard circuit, a contactor control circuit, a state output circuit and a protection circuit; the single-chip microcomputer is connected with the three groups of anti-parallel thyristors through the pulse trigger circuit; the current transformer is connected with the current detection circuit and a three-phase asynchronous motor. The asynchronous motor soft starter is convenient and easy to operate, and can run stably and reliably in time according to the change of motor load on the premise of meeting the starting torque requirement and reducing the starting current of the asynchronous motor.

Description

technical field [0001] The invention relates to the technical field of soft start, in particular to a soft starter for an asynchronous motor based on a single-chip microcomputer. Background technique [0002] AC asynchronous motors, especially three-phase squirrel-cage asynchronous motors, are widely used in agricultural production, factories and mines, transportation, In the defense industry and in various fields of people's daily life. However, there are many problems in the startup process. [0003] At present, the starting methods commonly used by asynchronous motors include full-voltage direct starting and reduced-voltage starting. The advantage of full-voltage direct starting is that the starting equipment and operation are the simplest, and the starting torque is larger than that of step-down starting; its disadvantage is that the inrush current generated during starting is 2 to 7 times its rated current, which will cause: ( 1) The instantaneous drop and violent fl...

Claims

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Application Information

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IPC IPC(8): H02P1/26
CPCH02P1/26H02P2207/01
Inventor 任磊
Owner 合肥誉联信息科技有限公司
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