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Method for controlling electronic pole inversion of multiphase induction motor on basis of vector control

A vector control, induction motor technology, applied in the direction of controlling electromechanical brakes, controlling generators, vector control systems, etc., can solve the problems of reduced control accuracy, economic and energy waste, and increased capacity of motor volume power devices.

Active Publication Date: 2011-11-23
ZHEJIANG UNIV
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Problems solved by technology

The commonly used solution is to connect the transmission system and the load through a mechanical gearbox, and change the speed ratio of the gearbox to meet the requirements, but this method is complicated in equipment, increased in volume and reduced in control accuracy; a larger power motor can also be simply used And large-capacity inverter, but the size of the motor and the capacity of the power device will increase, which will cause a lot of waste in economy and energy

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  • Method for controlling electronic pole inversion of multiphase induction motor on basis of vector control
  • Method for controlling electronic pole inversion of multiphase induction motor on basis of vector control
  • Method for controlling electronic pole inversion of multiphase induction motor on basis of vector control

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Embodiment Construction

[0061] The present invention will be further described below in conjunction with accompanying drawing.

[0062] A vector control-based electronic pole-changing control method for multi-phase induction motors proposed by the present invention, its principle block diagram is as follows figure 1 shown, including the following steps:

[0063] Such as figure 1 As shown, first establish the synchronous speed rotating coordinate transformation matrix of the multiphase system, as shown in formula (1), under this matrix by using n -1 current closed loop pair d1 -q 1 Fundamental current of the plane and other d-q The harmonic currents of the plane are independently decoupled and controlled, and the corresponding harmonic current vectors are respectively controlled by changing the phase and amplitude of the supply voltage to obtain the corresponding rotation of the rotating magnetic field.

[0064] (1)

[0065] In the formula: n is the number of phases of the motor ( n ≥3)...

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Abstract

The invention relates to a method for controlling electronic pole inversion of a multiphase induction motor on the basis of vector control. In the invention, the characteristic of multiple control freedom degrees of the multiphase motor is utilized and a current of each d-q plane is subjected to independent decoupling control by adopting rotor field-oriented vector control, so that the motor is controlled to operate in rotary magnetic fields with different pole pairs. Compared with the conventional pole inversion technology, the method has the advantages that the electronic pole inversion under a non-shutdown condition is realized; not only can the constant power operation range of the motor be enlarged, but also the large pole pair is adopted and the motor has good starting performance at low speed and the small pole pair is adopted at high speed; and the same speed has low current frequency relative to variable frequency speed regulation, so that the switching frequency and the ironconsumption are reduced. Moreover, in the electronic pole inversion process, the current and torque transition is smooth. The method has high reliability and is particularly suitable for high-power places.

Description

technical field [0001] The invention belongs to the technical field of motor control, and relates to an electronic pole-changing control method of a multi-phase induction motor based on vector control. Background technique [0002] In many applications, such as servo systems for machine tools, aircraft drives, and flywheel energy storage systems, it is urgently required that the transmission system not only provide large torque at low speeds, but also have a wide operating range of constant power speed regulation. Traditional induction motors The constituted AC drive system works in constant torque mode below the rated frequency, and in constant power mode above the rated frequency. In the constant power mode, the voltage at the motor terminal increases slowly with the increase of the frequency. When the voltage reaches the maximum voltage that the frequency converter can provide in the case of power supply by the frequency converter, the transmission system cannot continue ...

Claims

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Application Information

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IPC IPC(8): H02P21/14H02P21/10H02P25/20
Inventor 杨家强黄进胡浩峰康敏刘东
Owner ZHEJIANG UNIV
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