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Axial-flux machines tend to have cooling difficulties since it is difficult to arrange continuous heat path between the stator stack and the frame. One important reason for this is that no shrink fitting of the stator is possible in an axial-flux machine. Using of liquid-cooled end shields does not alone solve this issue. Cooling of the rotor and the end windings may also be difficult at least in...
A step-up transformer is frequently used in frequency converter motor drives to increase the output voltage of the supply system to the rated value of the motor. In addition, a larger current requirement is satisfied with parallel frequency converters coupled via three-phase multi-primary step-up transformer. The electrical harmonics have effects on the assembly losses and the drive performance, which...
This paper deals with loss calculations of low speed 45 kW permanent magnet synchronous motors with concentrated windings. All motors calculated have the same frame size, air-gap diameter, air-gap length and the same amount of permanent magnet material. Finite element method (Cedrat Flux2D) and analytical method are used in calculations. Losses calculated with both methods are compared and losses...
In motion control, high servomotor over loadings are required to maximize the acceleration and deceleration rates and thereby the process throughput. Typically the pull-out torques of the induction servomotors vary in between 3...5 times the rated value, while with standard industrial motors, the ratio is typically between 1.6...3. As the stator copper losses are proportional to the stator current...
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