Design of bridgeless IPMSM to reduce mass of applied permanent magnets

Interior permanent magnet synchronous motors (IPMSMs) are frequently used in industrial applications because their efficiency and power density are both very high. The IPMSM also makes a very good choice for an electric vehicle or hybrid electric vehicle, because the range of operating speeds is wide enough for use in traction applications. Recently, however, as a result of concerns about there being insufficient supplies of rare earth permanent magnets as well as atmospheric pollution caused by the exhaust gases of automobiles, a need has arisen for motor technologies that require fewer magnets and which can offer a higher level of efficiency. In this paper, we propose a bridgeless IPMSM as a means of reducing the number of permanent magnets used in a motor while simultaneously increasing the power density. The bridge structure, which supports the centrifugal forces generated in a motor’s permanent magnets as the rotor core rotates, was eliminated. To provide support for the separated pole-pieces and permanent magnets, new supporting structures are proposed. As a result, although the air gap torque of the bridgeless IPMSM is almost the same as that of the conventional design, the mass of the permanent magnets can be reduced by 10%.

[1]  Dae-Hyun Koo,et al.  Dynamic simulation and experimental verification of flux reversal linear synchronous motor , 2010, Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation.

[2]  Shigeo Morimoto,et al.  Machine parameters and performance of interior permanent magnet synchronous motors with different permanent magnet volume , 2000 .

[3]  Ju Lee,et al.  A Study on the Characteristics Due to Pole-Arc to Pole-Pitch Ratio and Saliency to Improve Torque Performance of IPMSM , 2007, IEEE Transactions on Magnetics.

[4]  Shigeo Morimoto Senior Member Trend of permanent magnet synchronous machines , 2007 .

[5]  Ji-Young Lee,et al.  Development of doubly salient permanent magnet linear synchronous motor for general-purpose automation applications , 2013 .

[6]  Shigeo Morimoto,et al.  Trend of permanent magnet synchronous machines , 2007 .

[7]  T.M. Jahns,et al.  An Analytical Design Approach for Reducing Stator Iron Losses in Interior PM Synchronous Machines During Flux-Weakening Operation , 2007, 2007 IEEE Industry Applications Annual Meeting.

[8]  Chester Coomer,et al.  Evaluation of the 2008 Lexus LS 600H Hybrid Synergy Drive System , 2009 .

[9]  Hyeong Joon Ahn,et al.  2D hall sensor array for measuring the position of a magnet matrix , 2014 .

[10]  Jin-Ho Kim,et al.  A novel design of permanent magnet wheel with induction pin for mobile robot , 2009 .

[11]  Sung-Min Kim,et al.  Rotor-Design Strategy of IPMSM for 42 V Integrated Starter Generator , 2010, IEEE Transactions on Magnetics.

[12]  Sung-Hoon Ahn,et al.  Mathematical modeling of hybrid renewable energy system: A review on small hydro-solar-wind power generation , 2014, International Journal of Precision Engineering and Manufacturing-Green Technology.

[13]  Dae-Hyun Koo,et al.  Development of an ultra high speed permanent magnet synchronous motor , 2013 .