Abstract
Low-energy permanent magnet (PM) such as ferrite is usually adopted in a PM-assisted reluctance (PMAREL) motor to enhance the output torque and reduce costs. However, the relatively low magnetic energy product and remanence in such PMs may lead to the risk of demagnetization. By using two types of materials of rare-earth NdFeB and non-rare-earth ferrite PM, a new less-rare-earth hybrid PMAREL motor is proposed in this paper, where the output torque and the power factor can be improved obviously, and meanwhile the risk of irreversible demagnetization in ferrite PMs can be reduced significantly due to the existence of NdFeB PMs. To verify the validity of the proposed motor, the operating principles of the motor and the positive interaction influences between the two involved types of PMs are analyzed. Moreover, by using the finite element method, the torque characteristics and anti-demagnetization capabilities are also investigated in details. Both the theoretical analysis and simulated results confirm the advantages of the proposed motor.
Highlights
The price of rare-earth materials has suffered dramatical rise and fall, which has renewed the interest in research of non-rare earth motors.[1]
A proper volume of ferrite permanent magnet (PM) is inserted in its rotor flux barriers with magnetization direction along the negative q-axis, which can provide a great advantage in terms of increasing power factor and lowering stator current, when compared with the traditional synchronous reluctance (REL) motors and induction motors.[5,6]
This paper investigates the characteristics of a new less-rare-earth hybrid PM-assisted reluctance (PMAREL) motor
Summary
The price of rare-earth materials has suffered dramatical rise and fall, which has renewed the interest in research of non-rare earth motors.[1]. A proper volume of ferrite PMs is inserted in its rotor flux barriers with magnetization direction along the negative q-axis, which can provide a great advantage in terms of increasing power factor and lowering stator current, when compared with the traditional synchronous reluctance (REL) motors and induction motors.[5,6]. Such typed of the ferrite PMAREL motors has shown a price advantage and several merits, the main defect is its low remanence (Br) and coercivity (Hc). The protective effects of NdFeB PMs in the ferrite operating points are addressed
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