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Three-phase motor variable frequency speed control system capable of outputting sine waves with frequency as high as 20000Hz

A three-phase motor, variable frequency speed regulation technology, applied in the control system, motor generator control, AC motor control and other directions, to achieve the effect of good circuit stability, excellent performance, smooth waveform

Inactive Publication Date: 2013-12-25
四川峰谷源新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary controller with slow running speed and limited I / O, which is not conducive to the overall function expansion of the drive
Ordinary drive circuits are generally only used for high and low voltage isolation, not all signals are isolated, and the anti-interference performance is not good enough

Method used

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  • Three-phase motor variable frequency speed control system capable of outputting sine waves with frequency as high as 20000Hz
  • Three-phase motor variable frequency speed control system capable of outputting sine waves with frequency as high as 20000Hz
  • Three-phase motor variable frequency speed control system capable of outputting sine waves with frequency as high as 20000Hz

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Embodiment Construction

[0029] See Figure 1 to Figure 3 , Figure 1 to Figure 3 What is disclosed is a three-phase motor frequency conversion speed control system with an output sine wave frequency up to 20000 Hz, including:

[0030] DSP processor, used to output three sets of three-phase drive PWM signals with a phase difference of 120 degrees;

[0031] The three-phase amplifying channels have the same structure and are arranged in parallel to respectively receive the corresponding three-phase drive PWM signals sent by the DSP processor, and increase the frequency of the three-phase drive PWM signals to greater than or equal to 20000 Hz for use in Control the drive circuit to drive the motor.

[0032] As an improvement to the present invention, the amplification channels of each phase include:

[0033] PWM optocoupler circuit, used to receive PWM signal input from DSP processor, and optocoupler to filter circuit;

[0034] The filter circuit receives and filters the PWM signal from the PWM opto...

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Abstract

A three-phase motor variable frequency speed control system capable of outputting sine waves with the frequency as high as 20000Hz comprises a DSP processor, three groups of three-phase drive PWM signals used for outputting phases with the difference of 120 degrees and three-phase amplifying channels, wherein the structures of the three-phase amplifying channels are identical, and the three-phase amplifying channels are distributed in parallel, receive the corresponding three-phase drive PWM signals sent by the DSP processor respectively, improve the frequency of the three-phase drive PWM signals to be larger than or equal to 20000Hz and are used for controlling a drive circuit to drive a motor. The three-phase motor variable frequency speed control system has the advantages of being smooth in output wave shape, low in motor operation noise, smooth, high in signal-noise ratio, little in signal distortion, wide in dynamic range, good in circuit stability, strong in anti-interference performance, capable of allowing digital or analog signals to be input, and flexible to use.

Description

technical field [0001] The invention relates to a three-phase motor frequency conversion speed regulation system with output sine wave frequency up to 20000Hz. Background technique [0002] At present, if you want to do a low-power motor performance test, the signal generator can generate a sufficiently high-frequency sinusoidal signal, but it is impossible to load it. The frequency converter can output high power, but the output frequency is too low, and the wiring debugging is complicated. If the known common three-phase AC motor works with a power frequency of 50 Hz, it can only be used in fixed speed situations such as 3000 rpm and 1500 rpm. Ordinary frequency conversion adjustment range is also limited, which limits the scope of use of three-phase motors. Moreover, the PWM frequency of ordinary inverters is generally low, only tens of KHz, and the output sine wave frequency of the drive is low, generally only a few hundred HZ, and the waveform is not smooth enough...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/08H02P11/06
Inventor 李青海朱克敏余得贵黄河治
Owner 四川峰谷源新能源有限公司
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