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There are many methods identifying flux position of Interior Permanent Magnet Synchronous Motor (IPMSM) without mechanical sensors. The method which uses both the back EMF and the saliency to identify flux position of IPMSM without high frequency components injection at low speed has been reported. It was extended in order to drive with no load to light load. The authors propose the method of combining...
A method for sensorless position estimation in PM synchronous motors is proposed. The high frequency zero sequence voltage generated by the PWM is used as carrier source. It is applied to the motor by closing the neutral point to the DC-link through a filter. The anisotropy information, and consequently the position of the rotor, is evaluated from the resulting non-zero sequence current. When compared...
Sliding mode observer (SMO) for permanent magnet synchronous motor (PMSM) speed and rotor position is used to realize sensorless control. Most of the current researches studying the PMSM SMO are based on non-saliency PMSM model and ignore the difference between d- and q-axes inductances. This paper studies a novel SMO based on PMSM's extended EMF (EEMF) model, considering the saliency of PMSM. It...
To solve the problems with the conventional direct torque control (DTC) of high speed permanent magnet synchronous motors (PMSM), a variable structure sliding mode direct torque control (VSS-DTC) without sensor is proposed in this paper. The control law of high speed PMSM VSS-DTC and the methodology of speed estimation are presented. The simulation model of the sensorless VSS-DTC system is built and...
In this paper, the sensorless control of the interior permanent magnet synchronous motors using the sliding mode and the binary observers are compared. Also, the structure of the above observers only uses the voltage equation. Since the parameters of the dynamic equation such as machine inertia or viscosity friction coefficient are not well known and these values can be easily changed during normal...
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