This paper discusses a reluctance-dependent back electromotive force (EMF) model for encoderless vector driven permanent magnet synchronous machines (PMSM) compared to well known, non reluctance-dependent back EMF models. Established PMSM could have considerable varieties in direct and quadrature inductances. So it makes sense to consider this behaviour in an extended back EMF model. On closer examination it will turn out that a reluctance dependent EMF model has a better behaviour at low speed as the standard model. Also the derivation of the extended model will be illustrated. Furthermore some simulation results and practical measurements will be discussed.
This paper presents calculations and measurements for a permanent magnet synchronous machine (PMSM) with buried magnets. Due to wide field weakening capability and high utilisation of this external rotor machine, it can be especially used for traction applications. The steady-state torque is about 346 Nm and overload torque at three times nominal current is about 580 Nm. Fractional-slot concentrated windings instead of distributed windings are used to increase the degree of automation. The short-circuit-proof machine is non forced air-cooled. The no-load torque ripple is calculated by numerical simulation and compared with measurement results. Also the so-called "Characteristic INFORM curves" for sensorless position control capability are presented. The efficiency curve of the machine provides high effiency of 94 % over a wide operation range.
The permanent magnet synchronous machine with an external rotor is the most important device for high performance electrical drive systems in particular for hybrid electric vehicles. The paper discusses finite element analyses of such a machine with concentrated tooth coils in terms of a comparison of both Y-and Δ-connected stator windings. As the evolved electromagnetic torque is one of the most important design parameter, various ratios of tooth width and slot pitch are analyzed with the two connections of the stator winding. On the other hand, the phase voltages for various operating conditions are compared between both Y-and Δ-connected stator windings.
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