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Soft starter/brake for three-phase motor

A three-phase motor and soft start technology, which is applied to starter parts, deceleration device parts, etc., can solve the problems of large brake structure, difficult to control accuracy, and poor braking effect, so as to achieve simple structure and avoid instantaneous Shock, no mechanical wear effect

Inactive Publication Date: 2010-12-15
SHANDONG LIAOCHENG BAELZ ELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, various methods such as triangular step-down start, autotransformer step-down start, and series resistance step-down start are generally used, but none of them can solve the instantaneous impact problem well, and at the same time, many devices are used, which is prone to failure.
As for the brake of the motor, there are generally two kinds of friction brakes and electronic brakes. The friction brakes mainly use friction plates. Due to the wear of the friction material, the service life of the equipment is affected, and the accuracy is difficult to control and the safety is poor. Electronic brakes are generally It uses a high-power transformer to change 220V or 380V AC to 60V, uses a high-power potentiometer to adjust the voltage used for motor braking, and then rectifies it for motor braking.
The brake structure of this structure is large in size and heavy in weight, and the braking effect is poor at the same time

Method used

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  • Soft starter/brake for three-phase motor
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  • Soft starter/brake for three-phase motor

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Embodiment Construction

[0009] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0010] The invention relates to a three-phase electric motor soft start brake which combines electronic soft start and brake. Using 220V or 380V three-phase AC power supply, single-chip microcomputer 1 adopts TUD23D6321BE chip, controlled by control signal input. Such as figure 1 , 2 As shown, the conduction signal output by the single-chip microcomputer 1 is connected to the running AC contactor 3 through the thyristor 2, and the running AC contactor 3 is also controlled by the running switch signal output by the single-chip microcomputer 1, and the running switch signal automatically pulls the KAZ intermediate relay 7, Pulling and running the AC contactor 3 controls the peripheral motor 6 to open the soft-start current channel to realize the forward soft start of the motor 6 . The brake signal output by the single-chip microcomputer 1 is connected...

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Abstract

The invention provides a soft starter / brake for a three-phase motor, relating to the braking and starting fields of three-phase alternating-current (AC) motors. The soft starter / brake mainly comprises a singlechip and is characterized in that the continuity signal output by the singlechip is connected with an operating AC contactor by a silicon controlled thyristor (SCR); the brake signal output by the singlechip is connected with a braking AC contactor by an IGBT; the operating AC contactor is controlled by an operating switching signal; the braking AC contactor is controlled by the braking switching signal; the singlechip is controlled by control signal input; and the operating AC contactor and the braking AC contactor control a peripheral motor. The soft starter / brake has double functions of electronic brake and soft start, drives the mechanical equipment to softly start, realizes low-current electronic brake and can prolong the service lives of the motor and the mechanical equipment and save the electric energy.

Description

technical field [0001] The invention relates to the field of braking and starting of three-phase AC motors, in particular to a combination of starting and braking devices for three-phase AC motors. Background technique [0002] At present, the motors of large and medium-sized mechanical equipment are widely used to start with reduced voltage. When the motor 6 is started, a large starting current will be generated, which will have a large instantaneous impact on the power grid and the mechanical equipment. At present, various methods such as triangular step-down start, autotransformer step-down start, and series resistance step-down start are generally used, but none of them can solve the instantaneous impact problem well, and at the same time, many devices are used, which is prone to failure. As for the brake of the motor, there are generally two kinds of friction brakes and electronic brakes. The friction brakes mainly use friction plates. Due to the wear of the friction ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P1/10H02P3/02
Inventor 丁晓轩蒋晓辉张学旺
Owner SHANDONG LIAOCHENG BAELZ ELECTRIC TECH
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