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In this study, a spherical motor, consisting of a spherical rotor and a spherical magnet-stator with a simple coil and soft iron, is mentioned and designed. 3D magnetic analyses of the designed motor are conducted, and its open loop control is done by 16F877 PIC microcontroller.
In order to implement an aviation or aerospace brushless DC machine servo control system in a high-temperature hostile environment, a novel electromagnetic rotor position sensor was designed. Concentrated excitation coils were symmetrically mounted at the middle of the stator inner circumference notches and the pickup ones were wound around the stator teeth. The rotor outer circumference was cut to...
The paper presents numerical simulation results and experimental data used for modeling a hybrid step motor (HSM). Two different HSM models have been developed starting from available technical data of a HSM (2-phase, bipolar, frame size 56.4 mm). One of the models is adequate for analyzing the HSM response to different control strategies, while the second one can be used for performing an electromagnetic...
This paper presents the rotor and stator optimal design for a PM spherical stepper motor by experimental design method and the heat analysis is performed using 3-D FEM. Based on the torque characteristics analysis and full factorial design, three main control factors are selected and their effects on the torque characteristics are discussed in detail. As for the steady-state heat analysis, the relationships...
This paper describes the strategy to design and control of an axial flux SPM machine for achieving a wide flux-weakening operating region. By using a slotted stator with fractional slot windings and additional cores enclosing end windings, the axial flux machine satisfies the specification of a wide constant power speed range. The design procedure is presented for increasing flux-weakening capability...
As bearingless motors have all advantages of magnetic bearings, they play an important role in solving difficult problems of special electric drives. The simplest and most versatile form of bearingless motor is the bearingless slice rotor motor. This kind of motor with centrifugal pump has a wide range of applications in life science, chemical processing industry, semiconductor manufacturing industry,...
The flux reversal machine (FRM) is a new machine that has a simple robust rotor with a permanent magnet installed stator. [Y. Liao et al., 1995][T.A. Lipo et al., 1997] However, the parameters of the FRM are dependant on the position of the rotor, operating temperature and magnetic saturation of the motor core. To obtain a robust performance of the single phase FRM, a control method that introduces...
The modern technique of direct torque control induction motor is modified in this paper. Machine analysis is emphasized directly on the 3-phase variables for motoring mode, so Park's transformation to generalized d-q axis theory is not used. Only stator current signal is functioning to evaluate fluxes and speed, so that no need to use any sensor. The 3-phase PPU inverter gate is excited by the control...
A doubly salient-pole homopolar generator has been proposed as high efficiency and a wide speed range generator. This generator has salient-poles in stator cores similar to switched reluctance motors. Between two stator cores permanent magnets are inserted with magnetization to the thrust axis. The rotor structure of the doubly salient-pole homopolar generator is very similar to the one in the switched...
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