High power two speed electric motor
First Claim
1. ) A dynamo electric machine constructed by i) linking the peripheral portions which are disposed furthest from the rotor face of a plurality of armature teeth arranged at equiangular pitches in a circumferential direction by an annular core body;
- and ii) winding around the teeth a plurality of coils composed partly of coils that are always excited by alternating current and partly of coils that are excited first by alternating current during a period of high torque demand induction machine operation and second by direct current during a period of lower torque demand operation as a synchronous machine;
iii) molding, forging, casting, machining or otherwise shaping a non-magnetic material into the shape of a round rotating member or rotor, which will fit closely inside, outside or longitudinally proximate the said stator and having all or part of the non-magnetic material of which the part of the rotor nearest the stator is composed and which magnetically isolates the rotor poles from one another be a nonmagnetic material which is also electrically conductive to facilitate circulation of inductive currents induced by the stator magnetic field during a period of higher torque demand operation as an inductive machine.
0 Assignments
0 Petitions
Accused Products
Abstract
This invention is a new dynamo electric machine of the alternating current type which provides for the entire stator winding to operate as an alternating current induction machine for relatively shorter periods of very high torque output operation, then provides for a portion of the stator winding to operate as a direct current exciter field winding while the balance of the stator operates as the armature windings of a high efficiency salient pole alternating current synchronous machine. The said machine or any electrical machine is further made more compact for a specific rate of output by providing stator winding insulation of an insulating material which provides for very high temperature operation and/or relatively high volume circulation of coolant throughout the porous winding insulation and potentially operates successfully at much higher temperatures than typical insulation systems. Also provided is a novel means of rotatably supporting a rotor of a dynamo electrical machine.
11 Citations
25 Claims
-
1. ) A dynamo electric machine constructed by
i) linking the peripheral portions which are disposed furthest from the rotor face of a plurality of armature teeth arranged at equiangular pitches in a circumferential direction by an annular core body; - and
ii) winding around the teeth a plurality of coils composed partly of coils that are always excited by alternating current and partly of coils that are excited first by alternating current during a period of high torque demand induction machine operation and second by direct current during a period of lower torque demand operation as a synchronous machine;
iii) molding, forging, casting, machining or otherwise shaping a non-magnetic material into the shape of a round rotating member or rotor, which will fit closely inside, outside or longitudinally proximate the said stator and having all or part of the non-magnetic material of which the part of the rotor nearest the stator is composed and which magnetically isolates the rotor poles from one another be a nonmagnetic material which is also electrically conductive to facilitate circulation of inductive currents induced by the stator magnetic field during a period of higher torque demand operation as an inductive machine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- and
-
12. ) A dynamo electric machine constructed by
i) linking the peripheral portions which are disposed furthest from the rotor face of a plurality of armature teeth arranged at equiangular pitches in a circumferential direction by an annular core body; - and
ii) winding around the teeth a plurality of coils composed solely of coils that are excited by alternating current iii) installing an exciter pole member comprised of 1 a circumferential band of either inherently magnetized material or of easily electrically magnetizable material disposed radially from the annular core at an intervening distance sufficient to provide magnetic separation therefrom but physically attached thereto. 2 a plurality of teeth equal in number to the armature teeth and projecting alternately from opposite sides of the circumferential band, the teeth shaped so that each one projects axially outward, then back between the armature teeth alternately from one side, then from the other side 3 a field coil wound in bobbin fashion proximate to the circumferential band of magnetic material n a manner such that a direct current flowing in the coil will cause the teeth projecting from one side of the band to become magnetized as north magnetic poles, and the teeth projecting from the other side of the band to become magnetized as south magnetic poles iii) molding forging, casting, machining or otherwise shaping a non-magnetic material into the shape of a round rotating member or rotor, which will fit closely inside, outside or longitudinally proximate the said stator and having all or part of the non-magnetic material of which the part of the rotor nearest the stator is composed be a non-magnetic material which is also electrically conductive to facilitate passage of inductive currents induced by the stator magnetic field. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
- and
-
21. ) An electric machine having the individual turns of the coil windings of the machine separated from one another by an electrically non-conductive open-cell foam or other porous material so disposed as to enforce or assist electrical isolation of the said coil turns by physical separation while providing passage for a coolant fluid either liquid or gas to circulate through the coil winding insulation and
the said foam or other porous material is comprised of one or more materials selected from the list of silicon carbide, ceramic sol-gel, carbon, graphite, polyphenelyne sulfide, concrete, silica based areogel, polyurethane, polyethelyne, polyether, polyester, neoprene, melamine, natural rubber butyl rubber
Specification