Open-loop vector control method and device for asynchronous motor

An asynchronous motor, vector control technology, applied in vector control systems, motor generator control, control of electromechanical transmissions, etc. moment effect

Active Publication Date: 2015-12-09
BEIJING KALOON ANALYTICAL INSTR +1
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  • Claims
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Problems solved by technology

[0004] The invention provides an open-loop vector control method and device for an asynchronous motor, which solves the problem that the torque in the low-frequency band is small in the existing voltage-frequency ratio constant value control mode, and the control algorithm for obtaining motor parameters and rotational speeds is complicated and difficult for VC vector control and DTC vector control. Problems with unsatisfactory control

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  • Open-loop vector control method and device for asynchronous motor
  • Open-loop vector control method and device for asynchronous motor
  • Open-loop vector control method and device for asynchronous motor

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Embodiment Construction

[0029] Embodiments of the present invention will be described below with reference to the drawings. Elements and features described in one drawing or one embodiment of the present invention may be combined with elements and features shown in one or more other drawings or embodiments. It should be noted that representation and description of components and processes that are not relevant to the present invention and known to those of ordinary skill in the art are omitted from the drawings and descriptions for the purpose of clarity.

[0030] refer to figure 1 and figure 2 , an asynchronous motor open-loop vector control method, comprising the following steps:

[0031] Step S10, calculating the three-phase stator currents Ia, Ib, Ic;

[0032] Step S20, such as image 3 As shown, the three-phase stator currents Ia, Ib, and Ic are transformed into two-phase static coordinate system currents iα, iβ by using Clarke transformation;

[0033] Step S30, calculating the stator volt...

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Abstract

The invention provides an open-loop vector control method and device for an asynchronous motor. The method comprises the steps of calculating a three-phase stator current; transforming the three-phase stator current into a two-phase stationary coordinate system current through Clarke transformation; calculating an electrical angle of a stator voltage vector of a motor; transforming the two-phase stationary coordinate system current into a rotating coordinate system current through Park transformation to obtain a magnetic flux current; controlling heavy duty starting and rapid response running of the motor within a whole frequency range through real-time tracking of the magnetic flux current; and calculating direct-axis voltage. Through corresponding inverse transformation, a rotating coordinate system current can be transformed into three-phase voltage without obtaining of the parameter and the rotating speed of a motor, and fine control effects can be achieved in a whole frequency range.

Description

technical field [0001] The invention relates to an asynchronous motor control method and device, in particular to an asynchronous motor open-loop vector control method and device. Background technique [0002] The application of asynchronous motor in the speed control system is more and more widely, because it has the characteristics of easy start-up and convenient maintenance. And vector control speed regulation, the principle of constant voltage-frequency ratio control speed regulation is: keep the ratio of voltage and frequency constant, adjust the output voltage synchronously when adjusting the motor speed, and ensure a constant voltage-frequency ratio to ensure a constant magnetic field ;Speed ​​sensorless vector control speed regulation includes VC vector control and DTC vector control. VC vector control is to transform vector coordinates after obtaining voltage and current, and simultaneously perform double closed-loop processing of speed and current to control the op...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14
Inventor 沈士军
Owner BEIJING KALOON ANALYTICAL INSTR
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