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A New Model-Free Control Device for Asynchronous Motor

An asynchronous motor and control device technology, applied in the direction of AC motor control, control system, electrical components, etc., can solve the problem of not having accurate speed control, and achieve the effect of fast running speed, good control performance and strong robust performance

Active Publication Date: 2018-10-30
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN201210552307.3 is similar to a frequency converter, but does not have precise speed control

Method used

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  • A New Model-Free Control Device for Asynchronous Motor

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] (1) According to the DC side capacitance [1] voltage signal U dc Synthesize the voltage signal U of the AC side of the converter with the converter switch signal sent by the DSP controller [3]. By integrating the AC voltage, a signal φ that is perpendicular to the phase angle of the AC voltage can be obtained.

[0013] (2) It is stipulated that the current with the same phase as the voltage signal U is the active current; the current with the same phase as the signal φ is the reactive current.

[0014] (3) The reference current can be oriented through the signals U and φ to realize the decoupling of active and reactive currents.

[0015] (4) The high-performance control of asynchronous motors can be realized after the decoupling of active current and reactive current.

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Abstract

The invention discloses a novel modeless controller of an asynchronous motor. A current transformer (2) and the asynchronous motor (4) are connected in parallel, a filter capacitor (1) is added to a direct-current side of the current transformer (2), and a power source is a direct-current or alternating-current power source for rectification. A DSP (digital signal processor) controller (3) operates a control algorithm, and dependency on high-performance control of model parameters of the asynchronous motor is omitted. Voltage signals of the capacitor (1) and switch signals of the transformer transmitted by the DSP controller (3) are synthesized into voltage signal of the alternating-current side of the transformer. The alternating-current voltage signals are oriented and decoupled by active and reactive current, and high-performance of the asynchronous motor is realized. Orientation and decoupling do not involve coordinate transformation and operation speed is high.

Description

Technical field [0001] The invention is a novel model-free control device for an asynchronous motor, relates to asynchronous motor control technology and detection technology, and belongs to the field of motor control. Background technique [0002] Asynchronous motors are currently the most widely used drive motors in national production, and their total load exceeds 50% of the total electricity consumption. Because a large number of asynchronous motors are not equipped with control devices, the efficiency of the asynchronous motors is low and a large amount of electric energy is wasted. The asynchronous motor is a multi-variable, nonlinear, highly coupled nonlinear system. In the past, the voltage / frequency constant control (V / F control) was based on the mathematical equation of the motor in steady state to study its control characteristics, and the control effect in dynamic state Not ideal. Vector control and direct torque control can achieve high-performance control eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P23/00
Inventor 卢子广胡立坤朱绯胡东
Owner GUANGXI UNIV