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Motor starting control method and device

A technology of phase current and current amplitude, applied in the field of motor start-up control methods and devices, can solve problems such as low motor operation stability and motor start-up failure, and achieve high power factor, stable speed, and improved stability

Active Publication Date: 2018-08-31
NINGBO AUX ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure a high power factor at the AC input terminal, the operating power of the motor must change with the phase of the AC input voltage, and the amplitude of the motor torque current is a fluctuation. The fluctuation of current amplitude may cause the motor to fail to start

Method used

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  • Motor starting control method and device

Examples

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Effect test

no. 1 example

[0057] An embodiment of the present invention provides a motor 130 startup control method, which is applied to the motor startup control system 100, and is used to enhance the stability of the motor 130 during the startup phase of the motor 130, so that the motor 130 starts successfully. see image 3 , is a flow chart of the motor 130 startup control method provided by the embodiment of the present invention. The starting control method of the motor 130 includes:

[0058] Step S301 : Receive AC current and phase current input to a motor 130 .

[0059] Understandably, both the AC current and the phase current input to the motor 130 are collected and transmitted by the circuit parameter acquisition module 110; in addition, the phase current input to the motor 130 includes u-phase current i u and v-phase current i v .

[0060] Step S302: Calculate the actual rotational speed value of the motor 130 based on the phase current.

[0061] Specifically, through the formula The a...

no. 2 example

[0104] see Figure 5 , Figure 5 A motor starting control device 200 provided in a preferred embodiment of the present invention. It should be noted that the basic principles and technical effects of the motor starting control device 200 provided in this embodiment are the same as those of the above-mentioned embodiments. corresponding content in the example. The motor starting control device 200 includes a parameter receiving unit 210 , a rotational speed determining unit 220 , a fluctuating torque current amplitude waveform determining unit 230 , a comparing unit 240 and an actual torque current amplitude waveform determining unit 250 .

[0105] Wherein, the parameter receiving unit 210 is used for receiving the AC current and the phase current input to a motor 130 .

[0106] It can be understood that the parameter receiving unit 210 can be used to execute step S301.

[0107] The rotational speed determination unit 220 is used for calculating an actual rotational speed val...

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Abstract

The embodiment of the invention provides a method and device for controlling starting of a motor and relates to the technical field of variable-frequency driving. According to the method and the device, when an actual value of a rotating speed of a motor is relatively small, a torque current amplitude waveform is kept in a constant state through judging whether the actual value of the rotating speed is greater than a first preset rotating speed and small than a second preset rotating speed or not and determining the torque current amplitude waveform according to the comparison result; after the actual value of the rotating speed of the motor reaches the second preset rotating speed, the torque current amplitude waveform changes along with a phase change of AC input voltage, so that the motor can be stable in rotating speed and can be normally started at a low-speed starting stage, has relatively high reliability and can ensure that a motor starting control system has a relatively highpower factor while running at a high speed. Furthermore, the process of switching the torque current amplitude waveform into a fluctuating state from a constant state is relatively gentle, so that thework stability of the motor is improved.

Description

technical field [0001] The present invention relates to the technical field of variable frequency drive, in particular to a method and device for motor start control. Background technique [0002] A compressor is a driven fluid machine that lifts low-pressure gas into high-pressure gas, and the compressor needs to be driven by a motor to work. [0003] In the prior art, the AC voltage is rectified to supply power to the inverter module. The inverter module is composed of a power switch tube and its drive circuit. The control module can control the inverter module to output three-phase AC voltage to drive the motor to run. A capacitor is provided between the module and the inverter module, and the capacitance of the capacitor is relatively small. In order to ensure a high power factor at the AC input terminal, the operating power of the motor must change with the phase of the AC input voltage, and the amplitude of the motor torque current is a fluctuation. Fluctuations in c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P1/26H02P27/06
CPCH02P1/26H02P27/06
Inventor 李发顺卓森庆黄绍敏皮书扬
Owner NINGBO AUX ELECTRIC
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