Abstract
This two-part study proposes a new sensorless control strategy for non-sinusoidal multiphase permanent magnet synchronous machines (PMSMs), especially integrated motor drives (IMDs). Based on the Sliding Mode Observer (SMO), the proposed sensorless control strategy uses the signals (currents and voltages) of all fictitious machines of the multiphase PMSMs. It can estimate the high-accuracy rotor positions that are required in vector control. This proposed strategy is compared to the conventional sensorless control strategy that applies only current and voltage signals of the main fictitious machine, including the fundamental component of back electromotive force (back EMF) of non-sinusoidal multiphase PMSMs. Therefore, in order to choose an appropriate sensorless control strategy for the non-sinusoidal multiphase PMSMs, these two sensorless control strategies will be highlighted in terms of precision with respect to rotor position and speed estimation. Simulations and the experimental results obtained with a non-sinusoidal seven-phase PMSM will be shown to verify and compare the two sensorless control strategies. In this part of the study (part I), only sensorless control in the medium and high-speed range is considered. Sensorless control at the zero and low-speed range will be treated in the second part of this study (part II).
Highlights
With the huge development of electrified automotive vehicles, low-cost electrical drives with high performances are sought
The usual drawback of numerous (2k + 1) AC cables to connect the machine to an external voltage source inverter is disappearing with the development of integrated motor drives (IMDs), in which the power inverter is integrated into the electrical machine [5,6,7]
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Summary
With the huge development of electrified automotive vehicles, low-cost electrical drives with high performances are sought. Sensorless control strategies for non-sinusoidal multiphase PMSMs, based on only the fundamental component of back EMFs (associated with the main fictitious machine), have been found in [27,29,30] In this case, only currents and voltages of the main fictitious machine are used to estimate rotor position. Only currents and voltages of the main fictitious machine are used to estimate rotor position In this part of the study, an original sensorless strategy using several harmonics of back EMFs to estimate the accurate rotor positions of non-sinusoidal multiphase machines is proposed.
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