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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...
An analytical model is proposed using the d/q-axis model to estimate the maximum output power of the high speed permanent magnet synchronous generator (PMSG) and corresponding current, power-angle, etc. An experimental phenomenon that a 100kW 45000rpm PMSG unable to generate rated power is analysed using the analytical model. Then the rotor structure is improved according to the analytical results...
In the last years, heavy-duty gas turbine has been increasingly used as high efficiency systems for heat and power generation. The typical size of these powerplants mainly consist compressor, turbine and combustor. And the rotor disc assembly structure is different from the single whole rotor structure. Several computer codes have been developed to analyse the strength of the rotor. In the present...
Disc-rotor has the advantages that the common continuous rotor doesn't have, but the specific structure of the disc-rotor makes it complex to compute the natural frequencies and vibration modes. It is mainly reflected in that the discs contact each other, which will bring considerable impact on the dynamic behavior of the disc-rotor. The state of contact between the discs is closely related rod preload...
Active Magnetic Bearing (AMB) system has been used in higher rotating speed and higher precision rotor system, the influence of time-delay can't be neglected. The focus of this paper is presents the influence and demonstration of the system time delay effects on AMB system that has been usually disregarded. Then, we present both explicit formulas and numerical solutions to determine the maximum delay...
This paper presents a robust fuzzy logic-base control scheme for a nonlinear magnetic bearing system with computing time delay. A proper Takagi-Sugeno fuzzy model is chosen to represent the nonlinear magnetic bearing. A fuzzy-model-based PDC controller is design in terms of a proposed delay-dependent stabilization criterion which guarantees the asymptotic stability of the fuzzy model. Simulation show...
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