Abstract
Bearingless switched reluctance motors (BSRMs) have both magnetic bearing as well as conventional motor characteristics which make them suitable for diverse industrial applications. This study proposes a design methodology for a BSRM in order to calculate the appropriate geometrical dimensions essential for realising a minimum levitation force at every orientation of rotor. It is based on the stator–rotor overlap angle and helps in reducing the complexities associated with the self-bearing operation of a switched reluctance motor (SRM). Different from a conventional SRM, the motor under study deploys a special single set parallel winding scheme for simultaneous production of torque as well as radial force. An analytical model incorporating this single set winding is developed for calculating the torque and the radial force. The proposed bearingless design is verified by developing a two-dimensional finite-element model of a 12/8 SRM in ANSYS Maxwell.
Highlights
Bearingless switched reluctance motor (BSRM) magnetically integrates the characteristics of a conventional switched reluctance motor (SRM) with an active magnetic bearing (AMB) [1,2,3]
This study proposes a design methodology for a BSRM in order to calculate the appropriate geometrical dimensions essential for realising a minimum levitation force at every orientation of rotor
It is based on the stator–rotor overlap angle and helps in reducing the complexities associated with the self-bearing operation of a switched reluctance motor (SRM)
Summary
Bearingless switched reluctance motor (BSRM) magnetically integrates the characteristics of a conventional switched reluctance motor (SRM) with an active magnetic bearing (AMB) [1,2,3]. Morrison [16] in 2002 patented the idea of a hybrid rotor single winding based BSRM, where he changed the structure of the SRM in order to simultaneously levitate as well as rotate the motor. This methodology is based on the stator–rotor overlap angle which has a major effect on the radial force required for self-bearing operation of the motor It introduces the application of a special single-set parallel winding scheme, called BCW, in a bearingless SRM for producing the torque and the radial force. In order to overcome this difficulty it is proposed to calculate the minimum stator–rotor overlap angle (wo) required to generate the levitation force for a particular motor and shift the excitation point S to that position.
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