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This paper proposes a new modular arc-linear flux-switching permanent magnet motor (MAL-FSPM) used for directly driving objects rotate back and force within a limited angle. Due to double salient effect and end effect, cogging torque of MAL-FSPM is very high, especially for rotor end meeting stator end. A novel cogging torque reduction method is proposed. New structure of MAL-FSPM is established based...
To solve the problem caused by the heavily axial gravity load of the rotor and main shaft of the hydraulic generators, a superconducting induction magnetic levitation device is proposed for hydraulic generator system. AC superconducting windings are implemented to increase the levitation force. The basic structure and principle are introduced. According to the calculated magnetic field distribution,...
In this paper a FEM model is proposed to simulate the guide wire navigation procedure in moving vascular structures. The virtual instruments are discretized with the multi-body representation, while the moving vascular structures are represented by a sequence of binary volumes segmented from the patient's data sets. The corresponding potential fields can be obtained by applying distance transform...
A rotary engine with rectangle pistons and cylinders is claimed to have higher mechanism efficiency for eliminating the lateral force between piston skirt and liner. Constrained by the present machining and assembly accuracy, surfaces of piston could not fit the internal surface of cylinder well which might lead to gas leakage from cylinder. A novel ring used to seal rectangular cylinder was invented,...
This paper focuses on influence of design parameters of permanent magnet machines with concentrated windings on cogging torque, torque ripple and mean torque. An efficient approach is presented to estimate the magnet width and slot opening width for minimizing cogging torque and/or maximizing mean torque. Two-dimension nonlinear finite element analysis including rotor motion is used for the calculation...
This paper presents evaluation and analysis of acoustic noise and vibration in interior permanent magnet synchronous motor (IPMSM). Acoustic noise and vibration have a close relationship. Acoustic noise is generated by vibration of the motor stator due to the magnetic force. It is called local force that is composed of normal force and tangential force. Harmonics of normal force associated with resonant...
Torque pulsation reduction of permanent magnet synchronous motor (PMSM) is an important design issue. One component of this pulsation is cogging torque, which depends on magnetic configuration of stator and rotor (e.g., magnets and slots shape and dimensions). This paper presents a new physical and mathematical analysis of cogging torque for surface mount PM (SFPM) motor. Based on the analysis, a...
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