Polyphase permanent magnet synchronous motor current waveform optimal control method

A technology of permanent magnet synchronous motor and current waveform, which is applied in the direction of motor generator control, electronic commutation motor control, control of electromechanical brake, etc., and can solve problems such as application limitations

Active Publication Date: 2014-01-01
武汉长海电力推进和化学电源有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Due to the adverse effects of harmful sub-harmonic currents of multi-phase permanent magnet synchronous motors, its application is limited
At present, there are few corresponding technical literature reports on the control strategy for solving the current waveform optimization of multi-phase permanent magnet synchronous motors.

Method used

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  • Polyphase permanent magnet synchronous motor current waveform optimal control method
  • Polyphase permanent magnet synchronous motor current waveform optimal control method
  • Polyphase permanent magnet synchronous motor current waveform optimal control method

Examples

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Embodiment 1

[0043] Example 1: Such as figure 1 , 2 Shown is a basic embodiment of the invention. A method for optimizing the current waveform of a multi-phase permanent magnet synchronous motor, comprising the following steps:

[0044] A. Current reference value coordinate transformation: based on multi-phase permanent magnet synchronous motor multi-synchronous rotating coordinate system rotor flux orientation vector control, according to the motor speed Proportional-integral adjustment results, determine the fundamental wave of the motor and the available times (… l ) harmonic current ratio and phase relationship, extract the current excitation components in the respective synchronous rotating coordinate system to generate the expected flux density waveform, and obtain the fundamental wave and available sub-harmonic current in the respective synchronous rotating coordinate system dq component reference value ; After multi-phase coordinate transformation, it is transformed into a...

Embodiment 2

[0047] Example 2: It is a further embodiment of embodiment 1, and is different from embodiment 1 in that: the multiphase permanent magnet synchronous motor current waveform optimization control method, its step A is according to the matrix T Realize multi-phase coordinate transformation from multi-synchronous rotating coordinate system to multi-phase stationary coordinate system:

[0048]

[0049] The matrix T is as follows:

[0050] in, m is the number of phases, , is the angle between each phase, is the rotor flux vector and the fundamental wave of the stationary coordinate system a The phase angle of the phase axis, detected by the position sensor, , l is the highest harmonic order available.

[0051] The multi-proportional resonant regulator in the multi-phase static coordinate system in the step B, the fundamental wave and n The subharmonics are characterized by a series of The angular frequency AC achieves effective amplitude and phase gain contro...

Embodiment 3

[0069] Example 3: It is a preferred embodiment of the present invention. On the basis of Embodiment 1, it is further specified that the multi-phase permanent magnet synchronous motor is a five-phase sinusoidal open-winding power supply permanent magnet synchronous motor, the fundamental wave current realizes electromechanical energy conversion, and the third harmonic current does not produce electromechanical energy conversion, so it is the object of suppression. Include the following steps:

[0070] A. Current value coordinate transformation: based on the rotor flux orientation vector control of the fundamental synchronous rotating coordinate system of the five-phase permanent magnet synchronous motor, according to the motor speed Proportional-integral (PI) adjustment results determine the fundamental current of the motor in its synchronous rotating coordinate system dq component reference value , , order the third harmonic current to be eliminated; , After multi-p...

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Abstract

The invention discloses a polyphase permanent magnet synchronous motor current waveform optimal control method, comprising the following steps of A, current reference value coordinate transformation; B, current multiple proportion resonance regulation; and C, coupling compensation. In the control method, based on polyphase permanent magnet synchronous motor vector control, a polyphase synchronous rotating coordinate system current reference value is transformed to a current reference value of each phase in a polyphase static coordinate system through polyphase coordinate transformation, the current reference value of each phase and a current feedback value of each phase of a motor are respectively subjected to improved multiple superposition proportion resonance regulation, and a resonance separation method is introduced, decoupling is realized by feed-forward compensation, and floating tracking and harmful subharmonic restraining for highly dynamic property fundamental waves and usable subharmonic are realized. The method can restrain the adverse impacts, such as motor loss, torque ripple and vibration noise, caused by a harmful harmonic current of the polyphase motor, can explore the positive effects of the usable harmonic current, gives full play to the advantages of the polyphase motor and improves the system performance.

Description

technical field [0001] The invention belongs to the technical field of AC motors and their control, and specifically relates to a method for optimizing the current waveform of a multi-phase permanent magnet synchronous motor, which is used in high-power AC motor transmission occasions, and is especially suitable for ship propulsion, mining machinery, rail traction, steel rolling, High-power AC motor drive occasions such as speed regulation of fans and pumps. Background technique [0002] AC motors, especially new permanent magnet motors, use rare earth permanent magnet materials to generate the magnetic field required for electromechanical energy conversion. They have the advantages of simple structure, reliable operation, small size, light weight, high efficiency and energy saving, etc., and have broader application prospects. [0003] The increasingly prominent energy problem makes the use of variable speed drives to reduce the waste and loss of high-power AC motors that a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/05
Inventor 姬凯龙文枫高跃文兰平徐明
Owner 武汉长海电力推进和化学电源有限公司
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