Synchronous machine design and manufacturing
First Claim
1. In a synchronous motor comprising one or more field structures and one or more armatures, the field structure having poles defining a magnetic field of wavelength λ
- and the armature having teeth with slots therebetween and coil windings wound in those slots, the improvement wherein a ratio of number of teeth to wavelength is 3;
1 and wherein the poles and teeth are dimensioned with respect to one another so as to minimize cogging.
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Accused Products
Abstract
Synchronous motors according to the invention operate at higher efficiency, with lower cost, reduced mass and reduced cogging. Magnet dimensions are selected that reduce cogging forces to a negligible amount even though there are fewer slots than normal. Optionally, it is possible to use non-overlapping windings with deeper and open slots. The approach is applicable to both rotary and linear motors and motors using either permanent magnets or electromagnets in the field structure. It is particularly relevant to linear or rotary motors that have a large air gap, and to small motors that must deliver a high ratio of thrust or torque to motor mass.
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Citations
17 Claims
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1. In a synchronous motor comprising one or more field structures and one or more armatures, the field structure having poles defining a magnetic field of wavelength λ
- and the armature having teeth with slots therebetween and coil windings wound in those slots, the improvement wherein a ratio of number of teeth to wavelength is 3;
1 and wherein the poles and teeth are dimensioned with respect to one another so as to minimize cogging. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- and the armature having teeth with slots therebetween and coil windings wound in those slots, the improvement wherein a ratio of number of teeth to wavelength is 3;
- 11. In a synchronous motor comprising one or more field structures and an armature, the field structures having magnetic poles and the armature having teeth with slots therebetween and coil windings wound in those slots, the improvement wherein the poles and teeth are dimensioned with respect to one another so as to minimize selected force harmonics, those selected force harmonics being ones that are proportional to a square of pole strength.
- 16. In a synchronous motor comprising one or more field structures and one or more armatures, the field structure having poles defining a magnetic field and the armature having teeth with slots therebetween and coil windings wound in those slots, the improvement wherein poles at the end of at least one field structure are arranged so as to minimize a third force harmonic between the field structure and the armature without increasing a sixth harmonic therebetween.
Specification