Fine-Tooth Iron-Core Linear Synchronous Motor for Low Acoustic Noise Applications

Jun Young Yoon, Jeffrey H. Lang, David L. Trumper

Research output: Contribution to journalArticle

6 Citations (Scopus)


The design of a novel low-noise high-force linear motor for precision positioning applications, such as in semiconductor lithography, is presented in this paper. New magnetic designs achieve low noise and vibration by reducing high spatial-frequency magnetic field components, which cause harmonic vibrations of a moving stage. To reduce such force harmonic content, our new motor has fine teeth, narrow slots with high slot aspect ratio, five phases, and a moving skewed Halbach magnet array. As compared with a commercially available iron-core motor, in our new design, the acoustic noise level in Pascals is reduced by more than 90%, corresponding to a 20 dB reduction in sound pressure level, even with a nonskewed magnet array. Using a skewed magnet array, the cogging-driven and velocity-dependent noise is further reduced by 90% in Pascals. This new linear motor simultaneously is capable of very high shear force densities in order to support high-acceleration motions, and thus provides new options for high-performance and quiet linear motion devices.

Original languageEnglish
Article number8357445
Pages (from-to)9895-9904
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Issue number12
Publication statusPublished - 2018 Dec

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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