Precise speed estimation and short measurement time delay is compulsory for high-performance electric drives. Rotary incremental position encoders are widely used together with speed estimation techniques such as period-based, frequency-based, constant elapse time, and synchronousmeasurement methods. This paper proposes the speed estimation technique, which helps to obtain higher accuracy by means of filtering the results of period-based method using third order Sinc-filter. As the sequence of period-based method estimations has the properties of delta-sigma modulated signal, extra information can be extracted. For the specified measurement time that gives higher accuracy than moving average filter. The developed speed estimation method was tested using experimental setup showing better accuracy compared to conventional methods.
The switched reluctance machines are known for their torque pulsations. The precise torque control is usually implemented by varying commutation angles and applying direct torque control. But still the problem of pulsation occurs during phase change. This paper proposes a model predictive direct torque control method, which cost function takes into account both torque and current control including heat dissipation balancing in a power converter. The proposed control strategy was examined using a simulation model and provides precise torque control. Heat dissipation balancing helps to equalize power modules temperature increasing the maximum output power of the power converter.
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