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An analytical method for predicting cogging forces in linear induction motors

Conference Paper


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Abstract


  • Cogging in a linear machine can be described as a

    variation in the magnetic forces as the machine travels

    along its linear uis. This effect can have a severe impact on

    the overall precision and even stability of the linear uis. In

    this paper an analytical method to predict the cogging

    forces in Linear Induction Moton (LIMs) is presented. An

    aecurate estimation of cogging is useful during the LIM

    design stage to help millimize this performance limiting

    factor. One common method used to predict cogging

    torques in rotary induction moton is the tooth overlap

    method. Due to the complexity of slot fringing effects in

    slotted cores, and the fact that fringing effects significantly

    influence the accuracy of this method, many researchers

    alJo use Carter and Green coefficients to increase accuracy.

    However, this approach does not accurately translate to the

    linear motor case. In this paper an estimation of the

    magnetic flux path (based on FEM simulations) is used,

    along with the gradient ofthe magnetic energy stored in the

    air gap, to predict the cogging forces in an LIM. The

    aecuracy of this prediction method is also verified

    experimentally through a cogging force analysis on a simple

    one-tooth test-bed.

Publication Date


  • 2011

Citation


  • Rusli, M., Moscrop, J., Platt, D. & Cook, C. (2011). An analytical method for predicting cogging forces in linear induction motors. LDIA 2011: The Eight Symposium on Linear Drives for Industry Applications (pp. 301-307). Eindhoven, The Netherlands: Eindhoven University of Technology. 2011

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=5274&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4253

Start Page


  • 301

End Page


  • 307

Abstract


  • Cogging in a linear machine can be described as a

    variation in the magnetic forces as the machine travels

    along its linear uis. This effect can have a severe impact on

    the overall precision and even stability of the linear uis. In

    this paper an analytical method to predict the cogging

    forces in Linear Induction Moton (LIMs) is presented. An

    aecurate estimation of cogging is useful during the LIM

    design stage to help millimize this performance limiting

    factor. One common method used to predict cogging

    torques in rotary induction moton is the tooth overlap

    method. Due to the complexity of slot fringing effects in

    slotted cores, and the fact that fringing effects significantly

    influence the accuracy of this method, many researchers

    alJo use Carter and Green coefficients to increase accuracy.

    However, this approach does not accurately translate to the

    linear motor case. In this paper an estimation of the

    magnetic flux path (based on FEM simulations) is used,

    along with the gradient ofthe magnetic energy stored in the

    air gap, to predict the cogging forces in an LIM. The

    aecuracy of this prediction method is also verified

    experimentally through a cogging force analysis on a simple

    one-tooth test-bed.

Publication Date


  • 2011

Citation


  • Rusli, M., Moscrop, J., Platt, D. & Cook, C. (2011). An analytical method for predicting cogging forces in linear induction motors. LDIA 2011: The Eight Symposium on Linear Drives for Industry Applications (pp. 301-307). Eindhoven, The Netherlands: Eindhoven University of Technology. 2011

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=5274&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4253

Start Page


  • 301

End Page


  • 307