Abstract
Given that most sensorless methods use the “flux linkage” algorithm for their control, this paper deals with possibilities to improve this sensorless method. When using the sensorless “flux linkage” method it is necessary to know not only the values of phase voltages and currents, but also the correct value of the phase resistance. During the operation of the switched reluctance motor, the value of the phase resistance is significantly changing due to the temperature dependence. Such resistance error causes an inaccurate estimation of the flux linkage. For this reason, it was desirable to implement a sensorless control algorithm for estimating phase resistance. In this paper, the experimental results of the implemented algorithm for estimating the phase resistance under the sensorless operation of a switched reluctance motor are presented. The practical implementation of control of the switched reluctance motor is carried out using a control system with a 16-bit digital signal processor. DOI: http://dx.doi.org/10.5755/j01.eee.20.5.7093
Highlights
The switched reluctance motor (SRM) is topologically and electromagnetically similar to stepper electric motors with variable reluctance
The switched reluctance motor is typically controlled by feedback from the position of the shaft so as to synchronize the commutation of phase currents with the position of the rotor, while the stepper electric motor usually operates in an open-loop, i.e. without any feedback from the position of the shaft
The paper deals with the sensorless control of the switched reluctance motor, with the influence and estimation of phase resistance during motor operation
Summary
The switched reluctance motor (SRM) is topologically and electromagnetically similar to stepper electric motors with variable reluctance. The switched reluctance motor is typically controlled by feedback from the position of the shaft so as to synchronize the commutation of phase currents with the position of the rotor, while the stepper electric motor usually operates in an open-loop, i.e. without any feedback from the position of the shaft. SRM has a number of suitable combinations of stator and rotor poles, while the number of poles on the stator and rotor is always different and in general, there is valid relationship between Nr = Ns − (Ns / m) where m is the number of phases. In the case of switching the power transistors T1 and T2 DC voltage is connected to the winding of the relevant SRM phase, and the current starts flowing through the circuit. If the power switches open, the current starts to flow through the zero diodes D1 and D2, the voltage on the winding changes its polarity and the current drops down to zero [1], [2]
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