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Thrust ripple, caused by non-sinusoidal magnetic field and end effect, always deteriorates the servo characteristics of linear servo system. In this paper the magnetic field of the double-side air-core permanent magnet linear servo motor (DAPMLSM) was analyzed by equivalent magnetization intensity method (EMI). The formulas were proved accurate by finite element analysis (FEA) and experiments. Then...
Thrust ripple, caused by non-sinusoidal magnetic field, always deteriorates the servo characteristics of linear servo system. In this paper the magnetic field and thrust of the double side air-core permanent magnet linear servo motor (DAPMLSM) is analyzed. It mainly analyzed trapezoidal shape permanent magnets motor, including the winding design, to find the key factors which affect the motor performance,...
A traction power supply system which adopted separately excited DC generator sets was designed. The desired output voltage was kept constant by regulating the rotary speed of induction motor and field current. In order to realize almost ripple-free operation in the entire speed range and achieve the position sensorless control, direct torque control based on space-vector modulation (DTCSVM) strategy...
The method of position detection for PMLSM by linear Hall-effect sensors is studied in this paper. The influence from motor's back iron to detection is discussed and analyzed. Based on finite element analysis of the motor's magnetic flux and considering the dimension limit of motor in practice, the best mounting position of the sensor is given to eliminate the influence of the back iron, and improve...
Virtual Instrument (VI) is an outcome with the development of computer technique, modern measuring and testing technique, and electronic instrument technique. It is a new vivid kind of measuring instrument with well outlook. Compared to the testing system of conventional rotary motor, the one of three-phase linear induction motor (LIM) is quite different with the measuring of thrust and normal force...
The large air gap linear induction motor (air gap length is greater than 10 mm) is well used in metro, light rail now, and also will have a nice future in Low-speed Maglev Vehicle. There are many differences between large air-gap linear induction motor and the small air-gap ones. It is necessary to do some research for the characteristics and driven technique of large air-gap linear induction motor...
The main principle of the linear generator in the Maglev was introduced in detail. Based on the dimensions of long stator motor in Germany TR08 Maglev, the variations of the electromotive force were highlighted along the motor's performances by the finite element method (FEM), such as currents, pole pitch and the air gap length. Then the curves of the amplitude of the electromotive force vs the rotor...
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