Torque ripple compensation in motor control systems

A motor control and torque fluctuation technology, applied in the field of torque fluctuation compensation, can solve problems such as structural damage, operator discomfort, and system inoperability

Active Publication Date: 2019-10-22
STEERING SOLUTIONS IP HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This torque ripple further leads to the deterioration of the NVH characteristics of the PMSM
NVH performance above a desired threshold level may cause operator discomfort, for example, if the PMSM is part of a steering system, vehicle, appliance or any other system, or even render the system inoperable
Additionally, NVH can cause structural damage to the system and / or the surrounding environment

Method used

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  • Torque ripple compensation in motor control systems
  • Torque ripple compensation in motor control systems
  • Torque ripple compensation in motor control systems

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Embodiment Construction

[0025] As used herein, the terms module and sub-module refer to one or more processing circuits, such as application-specific integrated circuits (ASICs), electronic circuits, processors (shared, dedicated or group) that execute one or more software or firmware programs and memory, combinational logic, and / or other suitable components that provide the described functionality. It will be appreciated that the sub-modules described below may be combined and / or further partitioned.

[0026] Referring now to the drawings, the technical solution will be described with reference to certain embodiments, rather than being limited thereto. figure 1 is an exemplary embodiment of an electric power steering system (EPS) 40 suitable for implementing the disclosed embodiments. Steering mechanism 36 is a rack and pinion system and includes a rack (not shown) located within housing 50 and a pinion (also not shown) located below gear housing 52 . As the operator input (hereinafter referred to...

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Abstract

According to one or more embodiments, a motor control system that provides torque ripple compensation includes a current regulator that receives a first current command corresponding to an input torque command. The current regulator further generates a first voltage command based on the first current command using a first transformation matrix. The current regulator further receives a second current command corresponding to a torque ripple to be compensated. The current regulator further generates a second voltage command based on the second current command using a second transformation matrix. The current regulator further computes a final voltage command using the first voltage command and the second current command, the final voltage command being applied to a motor.

Description

technical field [0001] The present application relates generally to motor control systems, and in particular to technical challenges related to torque ripple compensation when operating a motor control system. Background technique [0002] Industrial applications that require low cost and high control performance often employ complex electric drives in motion control systems, where complexity is introduced into various components such as power converters and motors to optimize cost. Often, this cost optimization results in changes in the noise, vibration and harshness (NVH) characteristics of the motor, sometimes exceeding desired threshold levels. [0003] Typically, current regulators can be used to operate motors using permanent magnet synchronous motors (PMSMs), producing orderly tracking torque fluctuations due to a non-sinusoidal back electromotive force (BEMF) distribution of magnetic flux around one or more air gaps in the PMSM (including cogging torque). Furthermo...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H02P21/05H02P6/10
CPCH02P21/05H02P6/10B62D5/046H02P29/50H02P21/22
InventorP·普拉莫德J·A·克莱瑙
OwnerSTEERING SOLUTIONS IP HLDG