Abstract
In order to approximately obtain sinusoidal air-gap magnetic field and get larger radial levitation force of the bearingless permanent magnet synchronous motor (BPMSM), a novel BPMSM with Halbach magnetized rotor is proposed. Firstly, the suspension and rotation mechanisms of the BPMSM are introduced. The control mechanism of producing the radial levitation force in single direction and arbitrary direction is analyzed in detail. The mathematical models of the radial suspension force are given. Secondly, the comparative research on the BPMSMs with the Halbach magnetized rotor and parallel magnetized rotor is carried out. The air-gap magnetic field, back electromotive force (EMF), radial suspension force, and torque are calculated and compared. Finally, the prototype motor equipped with the Halbach magnetized rotor is constructed. Some experimental results are tested and the stable suspension operation of the proposed motor is realized.
Highlights
High speed and high output power driving are the major development trends of electric machines
At present, highspeed electric machines are usually supported by ceramic bearings, whose life is 3-6 times longer than that of traditional mechanical bearings
In order to generate sinusoidal air-gap magnetic field waveform, improve the torque and radial suspension force density, a novel bearingless permanent magnet synchronous motor (BPMSM) with Halbach magnetized rotor is proposed in this paper
Summary
High speed and high output power driving are the major development trends of electric machines. These motors can support the rotors without any physical contact and have torque which replace the contact components and reduces the overall size [22] In these types of bearingless motors, the BPMSMs have attracted considerable interests due to the advantages of the small size and light weight, the high power factor and efficiency, and no need excitation current in the main winding. In order to generate sinusoidal air-gap magnetic field waveform, improve the torque and radial suspension force density, a novel BPMSM with Halbach magnetized rotor is proposed in this paper. To generate the radial suspension force in a single direction, the rotation direction of the torque windings magnetic field and suspension windings magnetic field must be the same, and the mechanical angular velocities of two magnetic fields must satisfy the following condition. Where ωM and ωB are the rotation mechanical angular velocity of the torque windings magnetic field and suspension windings magnetic field, respectively. ω is the electrical angular velocity
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
