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A rotor of a buried permanent magnet machine can be constructed reliably by using magnets to support the rotor structure against centrifugal forces. In this work, a rotor solution with V- shape magnets in every pole are replaced with a rotor solution where every second pole are geometrically supported by the rest of the poles with the magnets. Effect of the replacement of the rotor is compared by...
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...
This paper proposes an encoderless field-oriented control scheme for a permanent-magnet synchronous machine (PMSM) based on the back-EMF voltage. A polar stator coordinate representation is used to design a simple and robust position and speed estimator. The angle of the rotor is directly calculated based on stator current and voltage measurements as well as on knowledge of stator resistance and stator...
This paper investigates the nonlinear model of the permanent magnet synchronous machines (PMSMs). In order to incorporate the structural and saturation saliencies, two parameters are defined to indicate the saturation ratios. An analytical model is derived and the inductance matrix is expressed in both stationary and rotating reference frames, respectively. An incremental inductance measure system...
This paper discusses finite element analyses of a skewed permanent magnet synchronous machine (PMSM) with an external rotor regarding the magnetic saliency. Since the machine is fed from a voltage source inverter (VSI), a simulation as close as possible to the regular operational behavior is intended. Therefore, a voltage-driven finite element model with a strong circuit coupling excited with the...
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