Abstract
This paper proposes a new method for online identification of stator winding temperature for an open-end winding (OEW) permanent magnet synchronous motor (PMSM). The method exploits the zero sequence current (ZSC) due to the third harmonic back electromotive force (EMF) circulating in the system in order to estimate the phase resistance, which, in turn, is used to derive the winding temperature. In order to do this a proposed idea of maximum zero sequence current amplitude along with the actual ZSC amplitude and the electrical speed of the motor is used. The temperature is estimated without any additional sensors in a wide operating speed range. A single synchronous phase-locked loop (PLL) is utilised in order to obtain the required parameters. The independence of the rotor position grants the possibility for the exploitation of the proposed winding temperature estimation method in a variety of control techniques including the sensorless control to increase the robustness of the overall system.
Highlights
open–end winding (OEW) permanent magnet synchronous motor (PMSM) drives with common DC bus voltage are gaining increasing popularity in the pursuit of a low volume high power density solutions [1] for the aerospace [2], electric/hybrid vehicles [3] and wind power applications [4]
The analysis showed that this information can be derived using a maximum zero sequence current concept introduced in this paper, the actual value of ZSC amplitude and the rotor electrical speed
The third harmonic of the back electromotive force (EMF) causes the zero sequence currents to circulate in the OEW PMSM drives with common DC bus
Summary
OEW PMSM drives with common DC bus voltage are gaining increasing popularity in the pursuit of a low volume high power density solutions [1] for the aerospace [2], electric/hybrid vehicles [3] and wind power applications [4]. A new method was proposed which utilises the ZSC due to the third harmonic back EMF freely flowing in the system in order to extract the information on the phase resistance and, thereby, estimate the online stator temperature of the system. The freely flowing ZSC due to the third harmonic back EMF in an OEW PMSM with common DC link is a convenient opportunity for utilisation of the benefits of either a sensorless control or the proposed winding temperature estimation or even both, because the temperature estimation method proposed in this paper could potentially be combined with, for example, a novel zero-sequence modelbased sensorless control [13] and could be used to compensate the rotor position estimation in any other sensorless techniques which heavily depend on the winding resistance value. The method could be especially beneficial for the high power low volume high speed OEW PMSM drives with common DC bus due to their problems with suppression of the ZSC, described above
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