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Practical implementation of the sensorless field oriented control of a PMSM for wide speed range

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3 Author(s)
Perassi, H. ; Dept. of Power Electron. & Control, Ilmenau Tech. Univ. ; Berger, G. ; Petzoldt, J.

The aim of this paper is to present the implementation of the sensorless field oriented control of a surface mounted permanent magnet machine for wide speed range. At standstill up to a certain low speed range a high-frequency carrier signal based model is employed. The injected test signal is a rotating voltage vector in the stator reference frame and the rotor angle is estimated by filtering and demodulating the resultant high frequency currents. A modified PWM signal generation algorithm is implemented to reduce the dead-time extremely, in order to overcome the effects of the inverter non-linearity in the estimation process. A hybrid flux estimator based on the voltage model of the machine, dominant at higher speed, combined with the signal injection model is used, also a smooth transition between them is achieved. The experimental measurements show the effective performance of the position estimation method, which is implemented on a low cost, fixed-point DSP

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Power Electronics and Applications, 2005 European Conference on

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