Conventional soft starter for motor

A soft starter, conventional technology, applied in the direction of motor generator/starter, single multi-phase induction motor starter, starter parts, etc., can solve the problem that the terminal voltage cannot meet the specification requirements, affect the normal operation of other loads, The machine cannot withstand the impact torque of full-pressure starting, etc., so that the structure is firm and compact, and the installation is convenient and quick.

Inactive Publication Date: 2008-12-24
SOLCOM & HAPN SHANGHAI ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, as the most widely used squirrel-cage asynchronous motor, it adopts the conditions for step-down starting: first, when the motor starts, the machine cannot withstand the impact torque of f...

Method used

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Examples

Experimental program
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Embodiment Construction

[0006] When using the soft starter of the present invention, the output voltage of the thyristor increases gradually, and the motor gradually accelerates until the thyristor is fully turned on, and the motor works on the mechanical characteristics of the rated working voltage, so as to realize smooth start, reduce the starting current, and avoid starting over flow trip. When the motor reaches the rated number of revolutions, the starting process is over, and the soft starter automatically replaces the thyristor that has completed the task with a bypass contactor, which is the rated voltage for the normal operation of the motor, which has reduced the heat loss of the thyristor and prolongs the service life of the soft starter , improve its work efficiency, and avoid harmonic pollution to the power grid. The soft starter of the present invention also provides phase failure protection, overcurrent protection, overtemperature protection, and has functions such as self-diagnosis an...

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Abstract

The invention relates to a conventional motor soft starter, more particularly a full digital-control soft starter. The indicative signal of a signal relay of the soft starter comprises a fault signal, an overload signal, an operation signal and a start-up boost finish signal. The soft starter serves the excellent control function and multiple protective functions. Compared with the prior art, the soft starter utilizes a 16-bit single chip microcomputer to realize the full-digital date processing and to control the voltage ramp during the processes of the start-up and the stop; serves the functions of pulse bound, high-current shut-off, pump stop, built-in electronic overpower protection, phase-failure protection, over-current protection, over-temperature protection, self-diagnosis and energy conservation; can eliminate the current impact during the processes of the start-up and the stop of the motor; can reduce the capacity of the power network; and can protect the motor and the load against the mechanical shock during the processes of the start-up of the motor.

Description

[technical field] [0001] The invention relates to a conventional motor soft starter, especially a full digital control soft starter. [technical background] [0002] At present, the control function of the known soft starter is not perfect and lacks many protection functions, such as the impact of the current during the starting and stopping of the motor, the high capacity of the power grid, and the mechanical impact when the motor starts. For example, as the most widely used squirrel-cage asynchronous motor, it adopts the conditions for step-down starting: first, when the motor starts, the machine cannot withstand the impact torque of full-voltage starting; second, when the motor starts, its terminal voltage cannot meet the specification requirements ; The third is that when the motor starts, it affects the normal operation of other loads. [Content of the invention] [0003] In order to overcome the deficiencies of current motor soft starters, the present invention relate...

Claims

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Application Information

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IPC IPC(8): H02P1/02H02P1/04H02P1/28H02H7/08H02H7/085H02H7/09
Inventor 陈道贤
Owner SOLCOM & HAPN SHANGHAI ELECTRIC
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