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In the direct-drive wave energy conversion(DDWEC)system, the rotor of the linear generator oscillates along the vertical direction, as a result, the active power of the DDWEC and the DC voltage obtained by PWM rectification fluctuate greatly. To deal with this issue, a new biological intelligent controller which is based on the modulation principle of testosterone release is introduced. The models...
The thermal characteristics of motor relates to the secure operation of electric machine, which is important in the process of improving motor's efficient and working capacity. In this article, the thermal field of a special single-side permanent synchronous linear motor (SPLSM) is researched. A 3-Dimentional (3-D) flow model of the SPLFM's external surfaces is built, the average wind velocities and...
Ultra-high-speed permanent magnet synchronous motors (PMSMs) usually use bipolar rotors with ring permanent magnets (PMs) or cylindrical PMs which are magnetised in parallel. The stator of the motor is first simplified as a slotless stator, and an analytical solution to the flux density distribution in the motor is obtained by solving the Laplace's equation in the regions of PM and airgap. Then, by...
In this paper, a novel high-precision planar magnetic levitation is proposed, which combines the advantages of Halbach PM array with the controllable maglev structure. For accurate motion control of the levitation the end-magnetic-field-effect on the stator windings is taken into account, thus the equivalent magnetic charge method is proposed to calculate the 3D end-magnetic-field and compared with...
Permanent magnet synchronous machines are known as a good candidate for hybrid electric vehicles (HEV) due to their unique merits. This paper introduces a method for calculating the output torque by considering the cross saturation between direct-axis (d-axis) and quadrature-axis (q-axis) of an interior permanent magnet synchronous motor (IPMSM). The conventional two-axis IPMSM model is modified to...
On the basis of analyzing the mathematic model of high-frequency voltage excited permanent magnet synchronous motor (PMSM), a novel design method for the rotor saliency- tracking based position sensorless control of the PMSM was suggested. The three dimensional electro-magnetic analysis model and the sensorless control system model based on the rotor field oriented control strategy were established...
A rotor position and displacement estimation scheme using fluctuating high frequency voltage signal injection method was suggested, which will meet the need of low cost and practicable application for an inset permanent magnet bearingless motor (IPMBLM). Based on the motor space-saliency effect and the mutual inductance between the torque winding and the suspension winding of the IPMBLM, the rotor...
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