Method for detecting prestart load of intelligent soft starter of three-phase asynchronous motor

A soft starter and load detection technology, which is applied in the direction of motor generator testing, power supply testing, etc., can solve the problems of soft starter switch device damage, starting failure, damage to electromechanical systems, etc., to achieve improved work efficiency, low cost, and automation high degree of effect

Inactive Publication Date: 2009-12-16
四川西部高新产业开发有限公司
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AI Technical Summary

Problems solved by technology

If the load fails, it will cause damage to the switching device of the soft starter, causing starting failure, and even further expanding the failure to damage the electromechanical system

Method used

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  • Method for detecting prestart load of intelligent soft starter of three-phase asynchronous motor
  • Method for detecting prestart load of intelligent soft starter of three-phase asynchronous motor
  • Method for detecting prestart load of intelligent soft starter of three-phase asynchronous motor

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Embodiment Construction

[0012] exist figure 1 Among them, the intelligent soft starter first detects the power supply when it starts to work, and then the three-phase thyristor module sends a period of the second half of the positive wave of the three-phase alternating current that is gradually falling to the motor, and then passes through the current and voltage detection module Test whether the current change of the three-phase input terminals of the motor and the voltage change between the zero line and the zero line are continuous, and finally restart the motor.

[0013] exist figure 2 Among them, the principle of the present invention is explained that the voltage sent to the motor before starting is the second half of the positive wave of the three-phase alternating current.

[0014] exist image 3 Among them, the three-phase power input terminal 1 is connected to one end of the three-phase thyristor module 2 , the other end of the three-phase thyristor module 2 is connected to one end of th...

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Abstract

The invention relates to a method for detecting prestart load of an intelligent soft starter of a three-phase asynchronous motor, comprising a three-phase power input end, a three-phase controllable silicon module, a current voltage detection module and a motor. The three-phase controllable silicon module sends a cycle of the voltage which is the gradually descending second half part of a positive spiral wave of a three-phase alternating current into the motor before the intelligent soft starter electrifies the motor, the current voltage detection module tests the current changes of three-phases input ends of the motor and the voltage changes among the zero lines, if the changes are continuous, the motor and the devices relevant with the motor are failure-free, if the sudden changes are involved in the changes, the motor and the devices relevant with the motor are out of action.

Description

technical field [0001] The invention relates to a load detection method, in particular to a load detection method before starting of an intelligent soft starter of a three-phase asynchronous motor. Background technique [0002] At present, when the three-phase asynchronous motor intelligent soft starter works, it directly regulates the voltage and limits the current to supply power to the motor. The condition of the loaded motor is critical to the success of the start. If the load fails, the switching device of the soft starter will be damaged, which will cause starting failure, and even further expand the fault and damage the electromechanical system. Contents of the invention [0003] The purpose of the present invention is to provide a method for detecting the load before starting the intelligent soft starter of the three-phase asynchronous motor, so as to ensure that no failure occurs during the process of voltage regulation and current limiting for power supply to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34G01R31/42
Inventor 许志勇许铃
Owner 四川西部高新产业开发有限公司
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