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A robust cascade control structure using the H∞ linear parameter varying current controller and the H∞ speed controller is designed for the permanent magnet synchronous motor. The H∞ LPV current controller provides fast current tracking using measured rotor speed as a scheduling variable. High load torque disturbance attenuation is achieved using the fixed H∞ speed controller.
The paper describes an extended mechanical observer structure in combination with an enhanced voltage model for sensorless control of permanent magnet synchronous machines (PMSM) in the whole speed range. The observer estimates rotor speed, rotor angular position and load torque. An occurring deviation of both components; the estimated rotor position and the estimated speed, is fed back to the voltage...
This paper discusses a reluctance-dependent back electromotive force (EMF) model for encoderless vector driven permanent magnet synchronous machines (PMSM) compared to well known, non reluctance-dependent back EMF models. Established PMSM could have considerable varieties in direct and quadrature inductances. So it makes sense to consider this behaviour in an extended back EMF model. On closer examination...
This article discusses about the use of finite-element methods for the calculation of electromagnetic fields in electrical machines and for the determination of machines parameters and characteristics. The solutions offered can be classified as follows: steady state simulation, frequency domain simulation, time domain modeling and simulation, coupled electro-magnetic and thermal problems.
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