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A new and improved technique is presented for the measurement of iron loss in motor stators. The most accurate existing technique rotates dummy-test rotors, one for each field strength of interest, inside the stators to be tested and measures the reaction torque on the stators. The new technique uses a wound ‘rotor’ component that does not rotate mechanically but does rotate electrically. Therefore,...
The switched reluctance motor (SRM) is a low cost motor option. However it has lower power factor than competing motors and this has led to the incorrect perception that the power electronics are expensive. This paper shows that using the inverse of power factor as a proxy for converter rating and hence cost is incorrect; in particular device utilization and device switching losses are just as relevant...
Traditionally iron loss in motor stators is measured using loss separation, where overall loss is measured and then other losses like windage, bearings, copper, and rotor losses subtracted. This technique is unsatisfactory because the stator iron loss is typically smaller than the other losses subtracted and therefore a small error percentage wise in one of these other losses leads to a large error...
The switched reluctance motor (SRM) is a low cost motor option. However it has lower power factor than competing motors and this has led to the incorrect perception that the power electronics are expensive. This paper shows that comparing an inverter fed motor to an SRM requires consideration of more than just power factor. In particular device utilization and device switching losses are just as relevant...
Direct drive, in-wheel motors are ideal for electric and hybrid vehicles because the packaging of the drivetrain is so simple, because drivetrain losses are eliminated, and because individual wheel control improves handling and safety. In applications where cost is not a constraint, e.g. solar car racing, direct drive, in-wheel motors are the norm. In-wheel motors are also regularly demonstrated in...
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