AC motor three-phase current smoothing control device

A three-phase current, smooth control technology, applied in the direction of AC motor control, electromechanical devices, control systems, etc., can solve problems such as complex devices, complicated calculation and control processes, and difficulty in practical use

Active Publication Date: 2007-05-02
桂林星辰科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this control device not only requires complex devices and high current sampling accuracy, but also has a complicated calculation and control process, making it difficult to use in practice.

Method used

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  • AC motor three-phase current smoothing control device
  • AC motor three-phase current smoothing control device

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Embodiment Construction

[0011] The circuit of the smooth control device for the three-phase current of the AC motor of the present invention is shown in Fig. 1, including a vector generator for generating a three-phase sinusoidal given signal, and a three-phase current closed-loop controller. The three-phase sine wave signal output by the vector generator is sent to three current closed-loop controllers as a given signal, and the controller sends the three-phase sinusoidal current to the three-phase winding through the internal power loop, and the three-phase windings are mutually looped. This device also includes a center point extraction circuit network, which leads out the voltage of the three-phase motor ports, each connected to an equivalent impedance, and is connected at the Q point according to the star connection method to form a circuit for extracting the potential of the three-phase winding center point Q point Network, take the potential of point Q in the star circuit and introduce it into ...

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PUM

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Abstract

An AC motor three-phase current smoothing control device comprises a vector generator, a current closed-loop controller and a central dot abstraction electric network leading out the three-phase motor port voltage, each of which is connected with equivalent impedance, a star pattern connection is employed for common linking at dot Q, and a controller is introduced to mid-point Q electric potential for three phase current smoothing control, when the electric potential of the winding central dot deviates from null as the result of disequilibrium of the three phase current, the dot Q electric potential directly stimulates the winding mid-point potential and participates control.

Description

(1) Technical field [0001] The invention relates to a control device for the three-phase current of an AC motor, in particular to a smooth control device for the three-phase current of the AC motor. (2) Technical background [0002] The ideal way to control a three-phase AC motor is to feed a symmetrical three-phase sinusoidal current with variable frequency, the same amplitude, and a phase difference of 120 degrees to the three-phase winding of the motor through a frequency converter or an AC servo driver, thereby generating a A field field potential of controlled strength, direction of rotation and speed of rotation, ie a circular field field field potential, thus producing a rotating stator magnetic field. [0003] According to "AC Speed ​​Control System" (authors, Chen Boshi, Chen Minxun) published by Machinery Industry Press in May 2003, at present, the sine wave pulse width modulation method-SPWM method is generally used to provide three-phase sinusoidal voltage to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P23/00H02K11/00
Inventor 吕虹
Owner 桂林星辰科技股份有限公司
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