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This paper presents a hybrid excitation motor for a main spindle drive in end- and face-milling tools, which is operated with a high speed of 50 000 r/min. The proposed motor has not only a permanent magnet but also the field coil which makes field-weakening and field-strengthening controls possible with taking no notice of the permanent magnet demagnetization. In addition, the sum of iron and copper...
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...
An axial and radial air gap hybrid magnet circuit multi-coupling motor is produced based on hybrid stepping motor. The control of axial and radial air gap hybrid magnet circuit multi-coupling motor is flexible profited from its novel structure with axial coils which can be used as position sensor at the same time that the air gap flux can be adjusted by them. Based on harmonic analysis and experiment...
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...
The initial rotor position estimation is one of some serious problems about sensorless control of permanent magnet synchronous motors. This paper describes an estimation method of the initial rotor position for a slotless permanent magnet motor. The method is based on the variation of the current response when the voltage vector is applied to the motor. To estimate the polarity of the rotor magnetic...
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...
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,...
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,...
In this paper, an adaptive input-output feedback linearization controller for induction motors is introduced while the core loss resistance is included in the controller equations. It is assumed that practically core loss and rotor resistances are unknown. The proposed controller includes a nonlinear observer to simultaneously estimate core loss and rotor resistance along with d-q fluxes in the stationary...
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...
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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