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Braking method and system for a frequency converter

A frequency converter, braking mode technology, applied in the control system, motor/generator/inverter limiter, motor generator control and other directions, can solve problems such as stator winding damage

Active Publication Date: 2021-04-09
东莞市永兴机电工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing DC braking method will cause certain damage to the stator winding due to the long-term supply of large DC to the stator winding.

Method used

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  • Braking method and system for a frequency converter
  • Braking method and system for a frequency converter

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1, reference figure 1 , On the one hand, a braking method for a frequency converter, the method is applied to a motor speed control system composed of a frequency converter-motor, including:

[0022] Step S100, enter the braking mode;

[0023] Step S200, obtaining the initial output frequency Ps and output current Is of the inverter, and the initial rotational speed Vt of the motor when entering the braking mode;

[0024] Step S300, adjusting the output frequency of the inverter to the target frequency Pt and maintaining it, where Pt=0.1×Ps;

[0025] Step S400 , detect the rotational speed Vm of the motor, and when Vm=0.5×Vt, adjust the output frequency of the inverter to 0, and the inverter maintains the output current Iz until the motor stops rotating, wherein Iz≦0.5×Is.

[0026] Specifically, after entering the braking mode, the initial output frequency Ps and output current Is of the inverter are obtained through the transducer itself, and at the same t...

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PUM

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Abstract

The invention discloses a braking method and system for a frequency converter, wherein the method is applied to a motor speed regulation system composed of a frequency converter-motor, including: entering the braking mode; obtaining the initial value of the frequency converter when entering the braking mode Output frequency Ps and output current Is, the initial speed Vt of the motor; adjust the output frequency of the inverter to the target frequency Pt and keep it, where Pt=0.1×Ps; detect the speed Vm of the motor, when Vm=0.5×Vt, Then adjust the output frequency of the frequency converter to 0, and the frequency converter maintains the output current Iz until the motor stops rotating, wherein, Iz≤0.5×Is. The system includes: an information acquisition module, a frequency adjustment module and a current adjustment module; by changing the output frequency and output current of the frequency converter, the rotor of the motor can be braked, and the existing DC braking method can avoid damage to the motor. Rotors do more damage. The invention is mainly used in a motor speed regulating system composed of a frequency converter and a motor.

Description

technical field [0001] The invention relates to the field of governors, in particular to a braking method and system for a frequency converter. Background technique [0002] In the existing inverter and motor system, when the motor needs to be braked, the DC braking mode is generally used. The existing DC braking method is that when the motor speed decreases to a certain value, the inverter Direct current is passed into the stator winding of the asynchronous motor to form a static magnetic field. At this time, the motor is in the state of dynamic braking, and the rotating rotor cuts the static magnetic field to generate braking torque, so that the motor stops quickly. However, the existing DC braking method causes certain damage to the stator winding due to the long-time input of a large DC to the stator winding. Contents of the invention [0003] The object of the present invention is to provide a braking method and system for a frequency converter with less damage to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P3/18
CPCH02P3/18
Inventor 谢万端熊志龙熊定华
Owner 东莞市永兴机电工程有限公司