3-kW SynRM machine constant torque curve and MTPA curve. Red dotted line is MTPA trajectory, solid lines are torque contours, dashed lines are current magnitude contours.

Contexts in source publication

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... for salient pole machines. These optimal current control trajectories on í µí±–í µí±– í µí±‘í µí±‘ − í µí±–í µí±– í µí±ží µí±ž vector plane can be obtained based on the map in Fig. 2. This paper focuses on sensorless control and MTPA operation below base speed. The constant torque curve and MTPA curve of the SynRM under test are plotted in Fig. ...

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... MTPA curve in Fig 4 shows the operating trajectory with highest torque output while lowest current magnitude. When near zero torque is commanded, both í µí±–í µí±– í µí±‘í µí±‘ and í µí±–í µí±– í µí±ží µí±ž command currents are close to the origin based on MTPA curve. ...

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... data are collected to demonstrate the proposed active q flux concept and its enhancement towards sensorless control. The specification of the SynRM motor under test is shown in Table. I, and the overall system control block diagram and sensorless control diagram are shown in Fig. 4 and Fig. 10, respectively. Fig. 12 shows the dyne setup used for this demonstration, where speed regulation is achieved using the dyne for all the tests ...

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... experiments are conducted, where experiments A and B compare sensorless angle estimation using HFI method under no load (zero torque) and light load (25% torque) conditions, and experiments C and D look at back-EMF based sensorless angle estimation using active d flux and the proposed active q flux under no load and full load conditions. The annotations for different curves in Fig .14 to Fig. 17 are listed as í µí±–í µí±– í µí±Ží µí±Ž phase a current. í µí±–í µí±– í µí±í µí± phase b current. ...

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... constant torque curve in Fig 4 shows SynRM outputs zero torque when the current operation point is either on the d-axis or q-axis. In this experiment, three operational points are selected to compare HFI sensorless angle output. ...

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... HFI with Low Torque (25% rated) Output (5Hz 150rpm) To further demonstrate the improvement toward HFI sensorless control using q-axis current injection, a small torque (25% rated) is applied. Fig 14 shows two operational cases. The first operational point locates on minimum d-axis current excitation curve with around 40% í µí±–í µí±– í µí±‘í µí±‘ and 22% í µí±–í µí±– í µí±ží µí±ž ( í µí±–í µí±– í µí±‘í µí±‘ = 4í µí°´í µí°´, í µí±–í µí±– í µí±ží µí±ž = 2.23í µí°´í µí°´) selected which outputs 25% of rated torque. ...

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... result waveforms are shown in Fig 14(a), where phase currents wiggle and estimated position í µí± í µí± í µí±’í µí±’í µí± í µí± í µí±‘í µí±‘ oscillates. ...

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... contrast, Fig .14(b) shows the case with around 40% í µí±–í µí±– í µí±ží µí±ž and 18% í µí±–í µí±– í µí±‘í µí±‘ ( í µí±–í µí±– í µí±‘í µí±‘ = 1.76í µí°´í µí°´, í µí±–í µí±– í µí±ží µí±ž = 4.0í µí°´í µí°´)µí°´), which operates on minimum q-axis current excitation curve. ...

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... the case with around 40% í µí±–í µí±– í µí±ží µí±ž and 18% í µí±–í µí±– í µí±‘í µí±‘ ( í µí±–í µí±– í µí±‘í µí±‘ = 1.76í µí°´í µí°´, í µí±–í µí±– í µí±ží µí±ž = 4.0í µí°´í µí°´)µí°´), which operates on minimum q-axis current excitation curve. It also delivers 25% rated torque according to the constant torque curve shown in Fig 4. The harmonics of phase currents disappears and the estimated angle í µí± í µí± í µí±’í µí±’í µí± í µí± í µí±‘í µí±‘ stays close to the actual encoder angle í µí± í µí± í µí±’í µí±’í µí±’í µí±’í µí±’í µí±’ with almost zero angle estimation error shown in í µí± í µí± í µí±’í µí±’í µí±’í µí±’í µí±’í µí±’ . ...