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This paper presents two types of prototype motors for line-starting permanent magnet motors; one is a non-salient- pole machine, and the other is a salient-pole machine. Through both the analyses and the experiments, it is proved that the reluctance torque utility boosts up not only the steady-state characteristics but also the line-starting capability. It is also noteworthy that in the steady-state...
This paper presents a new maximum torque per ampere (MTPA) control method for Interior Permanent Magnet Synchronous Machine (IPMSM) drives. The proposed method uses the conventional speed control scheme, where speed control loop produces the magnitude of the stator current reference. According to the current angle in the rotor reference frame, ??, the current reference is decomposed to the d-/q-axis...
Using the analysis method for resolving the starting torque of line-starting permanent magnet (PM) synchronous machines with starting cage, the electromagnetic torque can be separated into two components, the driving ldquocage torquerdquo and the braking ldquomagnet torquerdquo. The correct saturation of the iron must be considered, when calculating the separate torque components. The sum of the two...
The evaluation of torque characteristics in saturated magnetic field for permanent-magnet (PM) synchronous motors is presented. Using the modified two-axis machine model that considers the cross-coupling effect, two important phenomena resulting from magnetic saturation are indicated: the decrease in magnet torque because of an anomalous flux of PMs and the existence of cross-magnetizing torque. These...
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