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Harmonic torque ripple reduction at low motor speeds

一种电机驱动系统、谐波的技术，应用在低速电机控制、电动机控制、电气元件等方向，能够解决增加扭矩脉动、无法解决电流调节器带宽等问题

Active Publication Date: 2009-10-28
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these techniques do not address the effects of current regulator bandwidth limitations on the system that may result in increased torque ripple

Method used

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  • Harmonic torque ripple reduction at low motor speeds
  • Harmonic torque ripple reduction at low motor speeds
  • Harmonic torque ripple reduction at low motor speeds

Examples

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Embodiment Construction

[0021] The following detailed description is merely illustrative in nature and does not limit the subject embodiments or the application and uses of the embodiments. As used herein, the word "exemplary" means "serving as an example, instance or illustration". Any method of performing described herein as an example is not necessarily to be considered a preferred or advantageous way over other methods of performing. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background, brief summary of the invention or the following accompanying detailed description.

[0022] Techniques and processes may be described herein in terms of functional and / or logical block elements, with reference to symbolic representations of operations, processing tasks and functions that can be performed by various computing components or devices. Such operations, tasks and functions are sometimes referred to as computer-implement...

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Abstract

The invention relates to harmonic torque ripple reduction at low motor speeds. Methods and systems are provided for reducing torque ripple in an electric motor. A method comprises receiving a torque command and determining a cancellation current command based on the torque command. The method further comprises generating a harmonic cancellation command based on the cancellation current command, wherein the harmonic cancellation command compensates for a phase shift and an attenuation introduced by a current regulated control module coupled to an inverter coupled to the electric motor. The method further comprises providing the harmonic cancellation command to the current regulated control module, wherein the current regulated control module is configured to control the inverter in response to the harmonic cancellation command and the torque command.

Description

technical field [0001] The present invention relates generally to electric motor drive systems, and more particularly, to methods and apparatus for reducing torque ripple of electric motors used in electric or hybrid electric vehicle drive systems. Background technique [0002] In vehicles using electric traction motors, an alternating current (AC) motor drive is used to provide the required torque to the motor shaft. Most motor drives attempt to provide a balanced set of pure sine wave currents to the motor stator windings to produce constant torque without twisting or ripple. However, due to practical design limitations of AC motors, even a pure sinusoidal stator current excitation will have torque ripple. Torque pulsations can cause speed pulsations, generate driveline resonances, or have other undesired consequences. In the case of a vehicle, the torque ripple generates vehicle vibration or noise. [0003] In some cases, the torque ripple produced by the motor can be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P23/03
CPCH02P29/0038H02P29/50
Inventor S·E·舒尔茨G·塔麦S·希蒂
Owner GM GLOBAL TECH OPERATIONS LLC
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