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This paper investigates a novel hybrid axial- and radial-magnetic circuit permanent magnet synchronous machine with flux weakening capability. The presented machine consists of a solid rotor and two stators, i.e. radial stator and axial stator. The PMs are radially buried in the solid rotor so that the flux flows into both radial and axial stator. This paper describes the principle of the presented...
This paper introduces a new topology of multi-stator hybrid excitation permanent magnet synchronous motor with flux weakening capacity. The presented machine features a hybrid magnetic circuit in which the flux generated by PMs are routed into two paths by employing an axial stator. The detailed structure of the presented machine is given in this paper together with the principle of flux weakening...
Line-start permanent magnet synchronous motor with composite rotor is a new type of permanent magnet synchronous motor, which uses eddy currents induced in solid rotor and copper bars to achieve self- starting capability. In order to research the demagnetization of permanent magnets under three-phase short circuit and out-of-step fault, the finite element model considering saturation, eddy currents...
The critical speed of the rotor can be calculated accurately by the transfer matrix method and the finite element method. Since the mass of the shaft section is neglected by the transfer matrix method, the calculation result is slightly larger. By establishing the 3D finite element model of the rotor system, the critical speed and mode of the rotor are analyzed. The results show that the bearing support...
For high speed permanent magnet machine, it is necessary to meet the requirements including electromagnetic properties, mechanical properties and temperature, so it is a multi-physics field iterative design process. Based on the electromagnetic field, the temperature field, the stress field and the rotor dynamics, a 360kW, 7000r/min high speed permanent magnet machine is analyzed. Through the multi-physics...
When the line-start permanent magnet synchronous motor (LSPMSM) operates stably, sudden change of load torque may result in out-of-step and supersynchronous faults. The currents in stator windings and rotor bars will increase under the two faults, so will the strength of demagnetization field, which is likely to cause the irreversible demagnetization of permanent magnets in LSPMSM. This paper adopts...
The air-gap field in slotless permanent magnet motor is small. Based on the surface mounted permanent magnet, this paper compares the parallel magnetization with the radial magnetization by finite element calculation. The results show that parallel magnetization can provide larger air flux in the slotless motor. The large effective air gap makes the end leakage serious. In order to resolve this problem,...
Considering the characters of high permeability, high resistivity, low loss and low cost for soft magnetic ferrite in high-frequency alternating magnetic field, this paper proposes a novel high speed permanent-magnet motor based on soft magnetic ferrite. Soft magnetic ferrite ring is used for stator core, rare earth permanent magnet ring serves as the rotor poles, and the slotless configuration with...
The dispersibility of permanent magnetic materials of mass production cannot be avoided, which can affect the performance of line-start permanent magnet synchronous motor(PMSM). The effect of dispersibility of permanent magnet on the starting performance, no load performance and rated performance is studied in this paper. The dispersibility of PM has great effect on the minimum torque in starting...
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