Asynchronous motor soft starter and control method thereof

A technology for asynchronous motors and control methods, which is applied to starters of single multi-phase induction motors, motor generators/starters, etc., and can solve problems such as unsatisfactory starting characteristics of motors, increased loads of switching appliances, and sudden drops in grid voltage. Achieve good anti-interference ability, good control quality and short transition process

Inactive Publication Date: 2017-10-20
TIANJIN UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

However, the starting characteristics of the motor have not been ideal, and there are many defects in the starting and stopping braking methods of the traditional motor.
As we all know, the starting current of a motor is generally 4-8 times the rated current, up to 15 times the rated current, which will cause a huge impact on the power grid, load machinery and the motor, and affect the service life of the motor and its driving equipment Causes a sudden drop in grid voltage, which directly affects the no

Method used

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  • Asynchronous motor soft starter and control method thereof
  • Asynchronous motor soft starter and control method thereof
  • Asynchronous motor soft starter and control method thereof

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] The invention provides a current-limiting soft starter for an asynchronous motor (see figure 1 ), consisting of a three-phase thyristor voltage regulating circuit, a current detection circuit, a controller, a voltage zero-crossing detection circuit, and a six-way trigger pulse generator. The terminal is directly connected to the stator terminal of the motor, and the current detection circuit will output the current signal detected by the motor side to the controller, and the controller will compare the actual current signal with the maximum current value allowed by the preset motor, output a control signal, and the voltage will cross zero The detection circuit collects the voltage signal from the grid line voltage as a synchronous voltage signal, and then inputs the control signal and synchronous voltage signal to the six-way trigger pulse generator to generate ...

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Abstract

The invention relates to an asynchronous motor soft starter and a control method thereof. The value of an actual current signal and a maximum current value permitted by a preset motor are compared through a current detection circuit, the comparison information is outputted to a controller, a control signal is outputted through operation processing, a synchronization voltage signal and a control signal acquired by a voltage zero cross detection circuit from a power grid line voltage are inputted to a six-path triggering pulse generator for generateing triggering pulse, a motor input voltage is controlled in real time through triggering pulse control on a three-phase thyristor voltage regulation circuit, so a start current of a motor is controlled in real time, and the motor is made to realize stable start. The method is advantaged in that 1, relatively good control quality is realized, and excellent anti-interference capability and high-speed high-precision control especially in the severe environment are realized; and 2, the active-disturbance-rejection control technology is utilized, small overshooting and the short transition process are realized, adaptation to change of an object model and the surrounding environment can be realized in a relatively large scope, control quality of a controller is not influenced, and excellent robustness is realized.

Description

technical field [0001] The present invention is an asynchronous motor soft starter and its control method, especially a new type of motor soft starter which applies the active disturbance rejection control technology to the controller. Advanced soft starter. Background technique [0002] With the continuous advancement of industrialization and urbanization, and the continuous in-depth development of economy and society, energy shortage and environmental pollution have become common problems faced by mankind. [0003] In recent years, with the development of the economy, our requirements for products have become higher and higher. High-quality products require higher production processes. How to make equipment work in a more stable and smooth environment with optimal efficiency , has gradually become a problem of widespread concern. [0004] As the most widely used motor, asynchronous motors are widely used in daily life, especially in industrial production, due to their ad...

Claims

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Application Information

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IPC IPC(8): H02P1/28
CPCH02P1/28
Inventor 周雪松崔皓博马幼捷高志强
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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