Method and device for controlling a motor

A control method and line voltage technology, applied in the field of frequency conversion, can solve problems such as endangering the stability of power electronic equipment, frequent switching, motor startup failure, etc., and achieve the effects of fast and accurate control, safe and reliable control, and improved control efficiency.

Active Publication Date: 2020-04-03
SHENZHEN INVT ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, before the inverter adopts the initial starting frequency to control the motor, the motor is not always in a static state. For example, due to the working needs of the motor and short-term power failures, the working state of the motor may be frequently between starting and standing still. to switch
If the motor is controlled at the initial starting frequency when the motor is running at high speed, the inverter will start protection action due to overvoltage or overcurrent, which will cause the motor to fail to start, and even endanger the stability of other power electronic equipment on the same power supply line.

Method used

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  • Method and device for controlling a motor
  • Method and device for controlling a motor
  • Method and device for controlling a motor

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Embodiment Construction

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0029] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects and not necessarily Describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of practice in sequences other than those illus...

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Abstract

Provided are a method and apparatus for controlling a motor. The method comprises: acquiring a three-phase voltage value from an output circuit of a motor, and acquiring a synthesized voltage amplitude value according to the three-phase voltage value (101); when the synthesized voltage amplitude value is greater than a preset voltage amplitude value, acquiring a first phase according to the three-phase voltage value (102); acquiring a first tracking frequency and determining the direction of rotation of the motor (103); and using the synthesized voltage amplitude value, the first phase, the first tracking frequency and the determined direction of rotation of the motor as an initial state of the motor in a tracking transition stage. The method not only improves the control efficiency, but also can achieve safe and reliable control.

Description

technical field [0001] The invention relates to the technical field of frequency conversion, in particular to a motor control method and device. Background technique [0002] With the continuous improvement of industrial automation, frequency converters have also been widely used. The frequency converter is a power control device that can control an AC motor (hereinafter referred to as "motor"). It can adjust the voltage and frequency of its output power supply according to the actual needs of the motor to provide the required power supply voltage for the motor. [0003] At present, the frequency converter presets an initial starting frequency for the motor, and uses the initial starting frequency to control the motor, and the output frequency of the frequency converter gradually transitions from the initial starting frequency to the rated frequency. However, before the inverter adopts the initial starting frequency to control the motor, the motor is not always in a static ...

Claims

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Application Information

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IPC IPC(8): H02P23/00
CPCH02P23/00
Inventor 徐铁柱王玉雷石超
Owner SHENZHEN INVT ELECTRIC
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