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The turbine speed loop adjustment is key link of the designing of the controller for the fixed pitch variable speed wind energy conversion systems (WECS). Because of the strong nonlinear, big inertia and mechanical damping characteristics, it's difficult to designing the controller of the wind power systems. In this paper, a small signal model is present, and based on the analyzing; a wind turbine...
The armature field for permanent magnet brushless (PMBL) machine working as DC motor is different from that as AC machine, which causes that the iron losses of PMBL DC motor are not equal with those of PMBL AC machine. An experimental system is designed to separate the iron losses due to armature field from other losses for PMBL DC motor and AC generator. The analysis results of the test data for...
This paper presents an experiment method designed to separate the iron losses due to armature magnetic field from other losses for permanent magnet brushless DC (PMBLDC) motor. The iron losses due to armature magnetic field for the prototype PMBLDC motor with carbon fiber retaining sleeve of 30kW are tested. The temperature rise tests have been done for the prototypes with carbon fiber retaining sleeve...
This paper presents two high speed brushless DC (BLDC) prototype motors: one is related to the surface-mounted permanent magnet (SPM) rotor, the other to the interior permanent magnet (IPM) rotor. The IPM rotor is a combination of magnets magnetized in tangential direction and in radial direction. As for the two prototype motors, the magnetic field distribution in the air gap calculated by 2D finite...
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