Slotless Bearingless Disk Drive for High-Speed and High-Purity Applications

In this paper, a bearingless drive for high-speed applications with high purity and special chemical demands is introduced. To achieve high rotational speeds with low losses, a slotless bearingless disk drive with toroidal windings is used. We present the working principle of the bearingless drive as well as a model for calculating the achievable drive torque. An advantageous winding system for independent force and torque generation is proposed, which can be realized with standard inverter technology. Additionally, the winding inductances are examined to evaluate the dynamic properties of bearing and drive. The findings are verified with simulation results and the system performance is successfully demonstrated on an experimental prototype, which runs up to 20 000 rpm and is designed for an output power of 1 kW.

[1]  Johann W. Kolar,et al.  Magnetically levitated slice motors - an overview , 2009 .

[2]  Li Chen,et al.  Speed Regulation Technique of One Bearingless 8/6 Switched Reluctance Motor With Simpler Single Winding Structure , 2012, IEEE Transactions on Industrial Electronics.

[3]  Natale Barletta,et al.  Principle and Application of a Bearingless Slice Motor , 1997 .

[4]  Akira Chiba,et al.  Evaluation of Magnetic Suspension Performance in a Multi-Consequent-Pole Bearingless Motor , 2011, IEEE Transactions on Magnetics.

[5]  Seong-yeol Yoo,et al.  Toroidally-Wound Self-Bearing BLDC Motor With Lorentz Force , 2010, IEEE Transactions on Magnetics.

[6]  Wolfgang Gruber,et al.  On the High Speed Capacity of Bearingless Drives , 2014, IEEE Transactions on Industrial Electronics.

[7]  Akira Chiba,et al.  Proposal and Analysis of a Novel Single-Drive Bearingless Motor , 2013, IEEE Transactions on Industrial Electronics.

[8]  Tadashi Fukao,et al.  Radial force characteristics of multi-consequent-pole bearingless motor , 2008, 2008 International Conference on Electrical Machines and Systems.

[9]  Johann W. Kolar,et al.  Motor Torque and Magnetic Levitation Force Generation in Bearingless Brushless Multipole Motors , 2012, IEEE/ASME Transactions on Mechatronics.

[10]  Wolfgang Amrhein,et al.  High-Speed Drive for Textile Rotor Spinning Applications , 2014, IEEE Transactions on Industrial Electronics.

[11]  T. Nussbaumer,et al.  Novel Magnetically Levitated Two-Level Motor , 2008, IEEE/ASME Transactions on Mechatronics.

[12]  Johann W. Kolar,et al.  Analysis of rotor shell losses in a magnetically levitated homopolar hollow-shaft permanent magnet synchronous motor , 2012, Proceedings of The 7th International Power Electronics and Motion Control Conference.

[13]  H. Mitterhofer,et al.  Design aspects and test results of a high speed bearingless drive , 2011, 2011 IEEE Ninth International Conference on Power Electronics and Drive Systems.

[14]  M. Ooshima,et al.  Design and Analyses of a Coreless-Stator-Type Bearingless Motor/Generator for Clean Energy Generation and Storage Systems , 2006, IEEE Transactions on Magnetics.

[15]  Zhaohui Ren,et al.  Improvements on winding flux models for a slotless self-bearing motor , 2006, IEEE Transactions on Magnetics.

[16]  Johann W. Kolar,et al.  50-$\hbox{N}\cdot\hbox{m}$/2500-W Bearingless Motor for High-Purity Pharmaceutical Mixing , 2012, IEEE Transactions on Industrial Electronics.

[17]  Zebin Yang,et al.  Overview of Bearingless Permanent-Magnet Synchronous Motors , 2013, IEEE Transactions on Industrial Electronics.

[18]  Wolfgang Amrhein,et al.  Motion control strategy and operational behaviour of a high speed bearingless disc drive , 2012 .

[19]  J. Kolar,et al.  Efficiency Optimization of a 100-W 500 000-r/min Permanent-Magnet Machine Including Air-Friction Losses , 2007, IEEE Transactions on Industry Applications.

[20]  Ming-Shi Huang,et al.  Design and Implementation of a Magnetically Levitated Single-Axis Controlled Axial Blood Pump , 2009, IEEE Transactions on Industrial Electronics.

[21]  Johann W. Kolar,et al.  Bearingless 300-W PMSM for Bioreactor Mixing , 2012, IEEE Transactions on Industrial Electronics.

[22]  Ralph M. Burkart,et al.  Analysis and Design of a 300-W 500 000-r/min Slotless Self-Bearing Permanent-Magnet Motor , 2014, IEEE Transactions on Industrial Electronics.