Method for suppressing torque ripple of permanent-magnet motor based on space vector modulation

A space vector modulation, permanent magnet motor technology, applied in torque ripple control and other directions, can solve problems such as inapplicability, and achieve the effect of easy implementation, suppression of torque ripple, and simple and effective torque ripple

Inactive Publication Date: 2010-10-13
SOUTHEAST UNIV
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Problems solved by technology

However, this type of method is based on the stator coordinate system, on the basis of the fundamental component of the armature current of each phase, and generates high-order harmonic electromagnetic torque by injecting the corresponding high-order harmonic current component. Control systems with space vector modulation are not suitable for

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  • Method for suppressing torque ripple of permanent-magnet motor based on space vector modulation
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  • Method for suppressing torque ripple of permanent-magnet motor based on space vector modulation

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Embodiment Construction

[0024] In order to solve the problems existing in the prior art, the present invention proposes a method based on space voltage vector modulation to directly inject quadrature-axis high-order harmonic currents to suppress the torque ripple of permanent magnet motors. The direct-axis armature current is zero, i.e. i d = 0 vector control strategy, according to the permanent magnet motor electromagnetic torque T em and quadrature axis armature current i q into a linear relationship to calculate the additional quadrature-axis harmonic armature current making the injected harmonic current With the direct axis permanent magnet flux linkage ψ m Mutual coupling produces additional quadrature-axis electromagnetic torque harmonic components and the fundamental wave and main high-order harmonic components in the positioning torque have equal amplitudes and opposite phases, and can cancel each other out, thereby achieving the purpose of suppressing torque ripple. where i d The vect...

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Abstract

The invention relates to a method for suppressing the torque ripple of a permanent-magnet motor based on space vector modulation. The method comprises the following steps of: adopting a vector control strategy that a permanent-magnet motor has a zero direct axis current so that electromagnetic torque and a quadrature axis armature current form a linear connection; and solving an additional quadrature axis injection harmonic current according to the linear connection of the electromagnetic torque of the permanent-magnet motor and the quadrature axis armature current so that an additional electromagnetic torque high-harmonic component generated by coupling the quadrature axis injection harmonic current and the direct axis permanent-magnet chain and fundamental and high-harmonic components in the orientation torque of the permanent-magnet motor have identical amplitude and opposite phases and can be mutually counteracted to suppress the torque ripple. The invention adopts the permanent-magnet motor as an implementation object, and the motor of the type can adopt advanced control protocols of vector control, direct torque control, and the like so that the method is simple and practical by editing control software without increasing the hardware cost of a control system and can obviously suppress the torque ripple of the motor and remain the constant motor characteristics of idling magnetic potential, torque output capability, and the like.

Description

technical field [0001] The invention relates to a control technology for suppressing torque ripple of a permanent magnet motor through current harmonic injection, belongs to the technical field of motor drive and control, and is a method for suppressing torque ripple of a permanent magnet motor based on space vector modulation. Background technique [0002] With the continuous improvement of the performance of permanent magnet materials and the continuous improvement of permanent magnet motor design and manufacturing technology, permanent magnet motors are widely used in more and more industrial drive and servo control fields. However, in the permanent magnet motor, the permanent magnet interacts with the slotted armature core to generate positioning torque, which in turn generates vibration and noise during the operation of the motor, which affects the low-speed performance of the motor in the speed control system and the high precision in the position control system positi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/10
Inventor 花为程明贾红云
Owner SOUTHEAST UNIV
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