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Stator string symmetric resistor reversible reversal connection brake control circuit

A technology of reverse braking and control lines, applied in the electrical field, can solve problems such as asymmetry, poor braking effect, and irreversibility

Inactive Publication Date: 2017-07-11
ANHUI JIUNENG INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing reversible reverse braking control circuit has technical problems such as asymmetry, irreversibility, and poor braking effect.

Method used

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  • Stator string symmetric resistor reversible reversal connection brake control circuit

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Embodiment Construction

[0009] The content of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0010] The structure diagram of a stator string symmetrical resistance reversible reverse braking control circuit is as follows: figure 1 As shown, a stator series symmetrical resistance reversible reverse braking control circuit includes a three-phase power supply 1, a fuse group 3, a contactor circuit 4, a current limiting resistance circuit 6, a thermal relay group 8, and a three-phase asynchronous motor M The circuit 9 is characterized in that: the three-phase power supply 1 is connected to three knife switches Q10 through three incoming lines 2, the three knife switches Q10 are connected in series with the three fuses FR11 in the fuse group 3, and the fuse group 3 and The contactor circuit 4 is connected between the current-limiting resistance circuits 6, and the input and output terminals of the thermal relay group 8 are re...

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Abstract

The invention relates to a stator series symmetrical resistance reversible and reverse braking control circuit, which belongs to the field of electric technology, and includes a three-phase power supply, a fuse group, a contactor circuit, a current-limiting resistance circuit, a thermal relay group, and a three-phase asynchronous motor M circuit. It is characterized in that: the three-phase power supply is connected to three knife switches Q through three incoming lines, the three knife switches Q are connected in series with three fuses FR in the fuse group, and the fuse group is connected to the current-limiting resistance circuit The contactor circuit, the input end and the output end of the thermal relay group are respectively connected with the output ends of the three main lines in the current limiting resistance circuit and the three phases of the M circuit of the three-phase asynchronous motor. Adopting the reversible reverse connection braking control circuit designed by the present invention can solve technical problems such as asymmetry, irreversibility, poor braking effect and the like existing in the existing reversible reverse connection braking control circuit technology.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a reversible and reverse-connected braking control circuit for stator series symmetrical resistors. Background technique [0002] Reverse connection braking of three-phase asynchronous motors is the reverse pull and reverse connection braking of the motor with forward rotation under the action of load torque. It is often used in occasions with gravity loads, such as the electrical control of bridge cranes. 1. Braking cannot achieve zero motor speed. In order to prevent the winding from overheating and reduce the braking impact, generally a reversed connection braking resistor should be connected in series in the motor stator circuit. There are two ways to connect the reverse braking resistor: symmetrical connection and asymmetrical connection. When the connection of symmetrical resistor is used, the braking torque is limited as well as the braking current; while the connecti...

Claims

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Application Information

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IPC IPC(8): H02P3/22
CPCH02P3/22
Inventor 姚和中
Owner ANHUI JIUNENG INFORMATION TECH
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