This paper presents the design, analysis, and PWM vector control of a hybrid permanent magnet hysteresis synchronous (PMHS) motor with a view to improve the performances of the motors for electric vehicle application. This hybrid design combines the advantageous performance features of both the conventional hysteresis motors and the permanent magnet motors. Electrical equivalent circuits of the PMHS motor are developed for both the synchronous and asynchronous modes of operation. PWM vector control simulation results for the motor drives are given. Finally, a laboratory prototype hybrid hysteresis permanent magnet motor was built. Test results validate the superior performances of the new motor.
Numerical models are developed to predict the electromagnetic vibration and noise of permanent-magnet direct current (PMDC) commutator motors when both rotor eccentricities and glue effects are involved. Finite-element method (FEM) and boundary-element method (BEM) are combined to analyze the electromagnetic, mechanical, and acoustical characteristics of the studied motor. By using the finite-element method, an electromagnetic field considered as the electromagnetic vibration and noise sources of the motor is calculated in the two-dimensional air-gap region. Based on the electromagnetic field, the radial and tangential magnetic forces exciting the structure of the motor are then obtained in the time and frequency domains. Consequently, the transient responses (accelerations) of the motor are simulated by applying the magnetic forces on the three-dimensional dynamic-structure finite-element model of the motor. Furthermore, the sound pressures radiated from the vibrating surface of the motor can be obtained by using the boundary-element method in the frequency domain. The numerical results agree well with those measured in the laboratory. The present research reveals that the static eccentricity distorts the distribution of the magnetic forces in the spatial domain. And the distorted magnetic forces mainly exaggerate the accelerations of the motor for the frequency range which is lower than the natural frequencies of the motor. In addition, the epoxide-resin glue between the permanent magnets and the stator can influence the vibrational and the acoustical characteristics of the motor.Index Terms-Boundary-element model, finite-element model, permanent-magnet direct current commutator motor, vibration and noise.
This paper presents the design and application of permanent magnets in the hysteresis motor with a view to improve the overall performances of such motor. The novel rotor consists of 36% Cobalt steel alloys with Neodymium Boron Iron permanent magnets. This hybrid design combines advantageous performance features of both the typical permanent magnet motors and the conventional hysteresis motors. The machine models for steady state and run-up performances are derived. Using state variable equations, starting and synchronizing performances are predicted. A 5hp laboratory proto-type permanent magnet hysteresis motor was built. Test results validate the superior performances of the new motor.
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