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This paper investigates the challenges of including saliency ratio as an objective function in the design optimization of interior permanent magnet (IPM) machines. The saliency ratio is the ratio between q- and d-axis inductances. Improvement of the reluctance torque component and self-sensing capabilities are directly related to the saliency ratio of the IPM machine. Thus, the maximization of the...
This paper proposes a novel technique to estimate online the inductances of a Permanent Magnet Synchronous Machine (PMSM) based on the measurement of the current derivatives excited by two active-voltage vectors and one zero-voltage vector within a PWM cycle. The d- and q-axes inductances of PMSMs are calculated during normal operation of the drive system. The influence of the magnetic saturation...
Precise knowledge of machine inductances are essential in the design of controllers with adequate dynamic and steady-state performance, for concentrated-wound interior permanent magnet machines. These machines have a relatively low base speed; therefore, their high-speed operation in the field-weakening mode requires the stator windings to be excited above the rated frequency. The effect of the current...
The Fractional Slot Concentrated Winding (FSCW) configuration increases spatial harmonics of the magneto motive force (MMF) waveform of an electric machine. Therefore, saturation level in such machines is typically higher than that of the conventional machines with distributed windings. Since the characteristic of Interior Permanent Magnet (IPM) machine principally depends on inductances variation,...
This paper investigates inductance characteristics of a novel 14 pole/18 slot, fractional-slot concentrated-winding (FSCW) IPM machine. The variations of the self and mutual inductances were calculated analytically and also obtained from the finite element model. These results were compared with experimentally measured values of the self and mutual inductances of the prototype machine. Study of the...
The application of concentrated windings (CW) in interior permanent magnet (IPM) machines has been claimed to enhance high-speed performance by increasing flux-weakening capabilities of the machine. However this is at the expense of a high cogging torque, decreased winding factor as well as saliency ratio. This paper illustrates the effects of implementing well known methods to improve open circuit...
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