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Non-speed sensor vector control method for AC asynchronous motor

A technology of AC asynchronous motor without speed sensor, which is applied in vector control system, motor generator control, electronic commutation motor control, etc. It can solve the problems of complex motor model, complex debugging, and many motor parameters, so as to achieve easy debugging, The effect of simple control algorithm and few control parameters

Inactive Publication Date: 2009-03-11
TSINGHUA UNIV
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Problems solved by technology

[0008] However, the common problem of these patents is that the motor model used in the control algorithm is c

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  • Non-speed sensor vector control method for AC asynchronous motor
  • Non-speed sensor vector control method for AC asynchronous motor
  • Non-speed sensor vector control method for AC asynchronous motor

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Embodiment Construction

[0034] The vector control method for the speed sensorless AC asynchronous motor proposed by the present invention, its principle block diagram is as follows figure 1 shown, including the following steps:

[0035] (1) Flux linkage control: set the excitation current command value according to the magnetic flux of the AC asynchronous motor After the system operation command is issued, the excitation control needs to be carried out first, and then the magnetomotive force is stabilized. figure 1 The speed closed-loop control in the. Otherwise, the speed will oscillate when starting the system. In addition, during the excitation process, the excitation current command value There cannot be a sudden change, so it needs to increase from zero to the set command value with a ramp function.

[0036] (2) Coordinate transformation: According to the position of the rotor flux linkage, using 3 / 2 transformation and synchronous rotation coordinate transformation, the detected current va...

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Abstract

The invention relates to a non-speed sensor vector control method of an AC asynchronous motor, which belongs to the motor control technical field. The method comprises the following steps; firstly, an exciting current and a torque current are obtained through the rotor flux oriented synchronous rotation transformation; secondly, the torque current is utilized for calculating the slip angular frequency of the motor and estimating the rotating speed of the motor; thirdly, the synchronous angular frequency is adjusted by utilizing the commanded rotating speed and the estimated error of the motor rotating speed; and finally, the control voltage applied to the electric motor is directly calculated and obtained according to a motor model, wherein the position of a rotor flux is obtained by the synchronous angular frequency integral. The invention has the advantages of simple implementation, good portability, less calculation amount, low processer requirements, less control parameters, easy parameter selection and easy system debugging. The method has reliable stability and low system parameter robustness.

Description

technical field [0001] The invention relates to a speed sensorless vector control method for an AC asynchronous motor, belonging to the technical field of motor control. Background technique [0002] The current frequency conversion speed regulation control methods of asynchronous motors mainly include constant voltage frequency ratio control, vector control and direct torque control. Among them, the constant voltage frequency ratio control method has been widely used because of its simple control. However, this method is an average value control method based on the steady-state model of the motor, which cannot achieve high dynamic control of the electromagnetic torque of the motor, so the system speed range, load capacity and dynamic response are poor. [0003] Vector control technology is a high-performance variable frequency speed control technology based on the rotor field orientation of the motor to realize the decoupling control of the electromagnetic torque and the r...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P21/26
Inventor 杨耕郑伟童建利
Owner TSINGHUA UNIV
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