A motor current limiting protection controller

A technology of motor controller and current limiting protection, which is applied in the direction of motor control, control system, electrical components, etc. It can solve the problems of poor current limiting effect, fixed current limiting value, and lack of pertinence, so as to improve reliability and safety The effects of stability, avoiding motor damage, and improving accuracy

Active Publication Date: 2020-06-02
江苏开璇智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to increase the current limiting value of the controller, a controller with a large current limiting value is usually used in the prior art, but this kind of controller with a large current limiting value is expensive, and the current limiting value is fixed, not targeted, and the current limiting effect is not good

Method used

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  • A motor current limiting protection controller

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the explanatory text.

[0031] Such as figure 1 As shown, the present invention provides a current limiting protection controller for a motor, wherein:

[0032] The input terminal of the voltage sampling circuit 1 is connected to the stator winding of any phase of the motor, and the voltage signal on the phase is collected. The voltage signal is the absolute value of the effective value of the voltage. In this embodiment, the voltage sampling circuit 1 collects the motor A phase Voltage signal Uo on the stator winding.

[0033] The motor is connected to the output end of a power drive unit 11. The power drive unit 11 includes a rectifier module 8 and an inverter module 9. The input end of the power drive unit 11 is connected to the three-phase AC power supply 10 through the first switch group ...

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Abstract

The invention discloses a current limiting protection controller of a motor, a voltage sampling circuit, a first controller, a second controller, and a current sampling circuit, which collects a current signal corresponding to the stator winding phase of the voltage sampling circuit, and the current sampling circuit The output terminal is connected to a third controller; a voltage divider circuit, a boost circuit, a comparator, and a voltage stabilizing unit, which include a rechargeable battery pack and voltage stabilizing capacitors arranged at both ends of the battery pack, and the input terminal of the battery pack passes through a The charger is connected to a power supply, the output end of the motor power supply is connected to the output end of a power drive unit, the power input end of the power drive unit is connected to the three-phase AC power supply through the first switch group; both ends of the voltage stabilizing capacitor are connected through the second switch group connected to the DC bus of the power drive unit. The invention adjusts the current limiting value of the motor in real time according to the magnitude of the voltage on the motor winding and the rate of change of the current, thereby effectively ensuring the safe operation of the motor and avoiding damage to the motor caused by overcurrent.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a current limiting protection controller for a motor. Background technique [0002] During the operation of the motor, the operating current sometimes exceeds the safe range of the system, resulting in malfunction or damage to the motor. For this reason, a current-limiting controller is usually installed in the motor controller, in order to limit the operating current within the safe range of the system . [0003] When the controller is working, it is not always in the current limiting state, only when the working current of the motor is greater than the current limiting value, the controller will limit the current. Generally, in the following situations, the working current of the motor will exceed the range. The first situation is in the acceleration stage of the motor, and the motor speed is very low, resulting in a large working current of the motor; the second situati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P29/032
CPCH02P29/032
Inventor 储建华韦汉培王刚扶文树
Owner 江苏开璇智能科技有限公司
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