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This paper presents a specific current profile to control recently proposed pseudo-sinusoidal switched reluctance motor (PSSRM), achieving a ripple-free output torque and reducing the dc input current pulsation. To generate a constant output torque, the proposed current profile is derived based on the inductance profile of PSSRM. The constant output torque eliminates the acoustic noise and the reduced...
In most servo motor drive applications, speed control is affected not only by disturbance torque but also by mechanical parameters such as inertia and friction coefficient. This paper presents a new technique for the inertia and friction identification which are based on adaptive identification. The strategy has been simulated and implemented in a drive system. The results demonstrate the high performance...
There are some problems of torque ripples and flux ripples and current ripples in traditional direct torque control (DTC). System with speed sensor has lower reliability and higher system cost. To solve these problems, an extended Kalman filter(EKF) was established to observe stator flux linkage and estimate motor speed, thus speed sensorless direct torque control for asynchronous motor was realized...
Based on mechanical kinetics theory, the torsional vibration equation of Twist drill is built and solved. Then, according to the characteristics of axial vibration drilling, its torsional vibration performance is analyzed deeply. The result shows that the average torsional deformation of low-frequency axial vibration drilling is less than that of common drilling and the torsional deformation of ultrasonic...
A yaw motion stabilization controller in Electric Power Steering (EPS) system is designed in this paper. According to the linearized four-wheel model of vehicle, a state observer of cornering state variables, such as yaw rate angle and slip angle. In order to improve the drive comfort and drive safety for EPS, a Yaw Rate Generator is designed and a yaw rate stabilization controller is constructed...
The mathematical models of five-phase permanent magnet synchronous motor (PMSM) in abc frame and alphabeta frame are established, and the relationships between the torque and fundamental components, loss and harmonic components are revealed. To suppress the high third harmonic current appeared in five-phase machine especially, a novel space vector pulse width modulation (SVPWM) method which has a...
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