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Soft starter for motor

A soft starter and main voltage technology, which is applied in the direction of motor generator/starter, starter of a single multi-phase induction motor, starter parts, etc., can solve the problem that the terminal voltage cannot meet the specification requirements, and the machine cannot withstand the full voltage Problems such as starting impact torque and affecting the normal operation of other loads, etc., achieve the effect of high reliability

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 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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PUM

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Abstract

The invention relates to a conventional motor soft starter, more particularly a full digital-control soft starter. The soft starter serves excellent control function and multiple protective functions, comprises an LED display with the function of display in four languages, 8 LEDs, 6 setup buttons and an RS 485 communication interface, and functions based on the Modbus / Profibus protocol. Compared with the prior art, the soft starter has the unique intelligent electronic circuits for serving the excellent control and protection functions; serves the functions of linear acceleration start-up, pump start-up control and pump stop control; is pre-set with the mode of low-speed operation (low-speed short-time electronic control forward / reverse modulation) and the free switch mode of the duplex start / stop parameters; can monitor the load conditions and automatically realize the light-load energy-saving operation mode; serves the functions of motor insulation detection and protection, open-phase protection, short-circuit protection, phase sequence protection and electronic overload protection; and utilizes the RS 485 communication interface adopting the Modbus / Profibus protocol to realize the overall microcomputer-based remote control and monitoring.

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 invention relates to a m...

Claims

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Application Information

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IPC IPC(8): H02P1/04H02P1/28H02H7/08
Inventor ้™ˆ้“่ดค
Owner SOLCOM & HAPN SHANGHAI ELECTRIC