Reduction of torque ripple induced acoustic emissions in permanent magnet synchronous motors

Damien J. Hill, Greg Heins, Mark Thiele

    Research output: Chapter in Book/Report/Conference proceedingConference Paper published in Proceedings

    Abstract

    Torque ripple exists at the output of permanent magnet synchronous motors (PMSMs) as a result of current measurement error, non-sinusoidal back-electromotive force (EMF), and cogging torque. Acoustic emissions caused by torque ripple coupling through the mechanical system and interacting with the motor housing limit the applications available to PMSMs. Since part of the cogging torque component is based on manufacturing error, motor design alone may not eliminate all torque ripple. One possible method for the reduction of torque ripple is to use the inverse of a torque ripple estimate to adjust the output torque via the motor controller. This digest uses a coherence calculation to show that acoustic emissions are a direct result of torque ripple and outlines a control method that uses a microphone to sample the acoustic emissions and determine an estimate of, and then to reduce, the torque ripple for a number of orders simultaneously. The transfer function between the torque reference and the sensor is also determined as part of this method. A comparison of results between a high quality microphone and low cost electret microphone is also made. Experimental results show that there is good coherence between torque ripple and acoustic emissions at the orders associated with torque ripple. The proposed method was shown to be effective in significantly reducing the acoustic emissions caused by torque ripple, using both the high quality microphone and electret microphone, in some instances by more than 23dBA. After reduction, the magnitude of the acoustic emissions were similar to that of the background noise at other frequencies.

    Original languageEnglish
    Title of host publication2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017
    Place of PublicationMiami, United States
    PublisherIEEE, Institute of Electrical and Electronics Engineers
    Number of pages7
    ISBN (Electronic)9781509042814
    ISBN (Print)9781509042821
    DOIs
    Publication statusPublished - 3 Aug 2017
    Event2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017 - Miami, United States
    Duration: 21 May 201724 May 2017

    Conference

    Conference2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017
    CountryUnited States
    CityMiami
    Period21/05/1724/05/17

    Fingerprint Dive into the research topics of 'Reduction of torque ripple induced acoustic emissions in permanent magnet synchronous motors'. Together they form a unique fingerprint.

    Cite this