SWITCHED RELUCTANCE MACHINE
A switched reluctance machine (SRM) having a rotor and stator pole numerical relationship of S number of stator poles and R number of rotor poles, where R=2S−2, when S is greater than 4; provides improved power density, torque production, torque ripple, and is readily adaptable to existing hardware such as known controllers and the like.
1 . A switched reluctance machine comprising:
a rotor arranged to rotate about a central axis, the rotor comprising a set of rotor poles;
a stator positioned adjacent and axial to the rotor, the stator comprising a set of stator poles; and
wherein the rotor poles and the stator poles are in a numerical relationship defined by the formula:
number of rotor poles (R)=(2 times the number of stator poles (S)) minus 2, or R=2S−2, where S>4.
2 . The switched reluctance machine of claim 1 wherein the stator further comprises a first stator surface and the rotor further comprises a rotor surface, the rotor surface positioned generally parallel to and facing the first stator surface.
3 . The switched reluctance machine of claim 2 wherein the stator poles project generally perpendicular from the first stator surface and the rotor poles project generally perpendicular from the rotor surface.
4 . The switched reluctance machine of claim 3 wherein the stator further comprises a second stator surface on an opposite side from, and generally parallel to, the first stator surface, and the switched reluctance machine further comprising:
a second rotor arranged to rotate about the central axle, the second rotor including a second rotor surface positioned generally parallel to and facing the second stator surface, the second rotor further comprising a set of rotor poles projecting generally perpendicular from the second stator surface.
5 . The switched reluctance machine of claim 3 further comprising a plurality of stators and a plurality of rotors arranged about the central axis to increase an output torque of the switched reluctance machine.
6 . The switched reluctance machine of claim 1 wherein the switched reluctance machine is a three phase type.
7 . The switched reluctance machine of claim 1 wherein S=6 and R=10.
8 . The switched reluctance machine of claim 1 wherein S=8 and R=14.
9 . The switched reluctance machine of claim 1 wherein S=10 and R=18.
10 . The switched reluctance machine of claim 1 further including a plurality of coils, each of the plurality of coils winding around a respective stator pole.
11 . The switched reluctance machine of claim 10 further including an electrical control circuit operably attached to each of the plurality of coils.
12 . The switched reluctance machine of claim 1 further including a plurality of coils, each of the coils winding around a portion of the stator and adjacent to a respective stator pole.
13 . The switched reluctance machine of claim 12 further including an electrical control circuit operably attached to each of the plurality of coils.
14 . The switched reluctance machine of claim 1 wherein the number of stator poles is double a number of phases.
15 . A switched reluctance machine comprising:
a stator including a plurality of stator poles;
a rotor including a plurality of rotor poles, the rotor at least partially surrounding and arranged to rotate around the stator; and
wherein the rotor poles and the stator poles are in a numerical relationship defined by the formula:
number of rotor poles (R)=(2 times the number of stator poles (S)) minus 2, or R=2S−2, where S>4.
16 . The switched reluctance machine of claim 15 wherein the switched reluctance machine is a three phase type.
17 . The switched reluctance machine of claim 15 wherein S=6 and R=10.
18 . The switched reluctance machine of claim 15 wherein S=8 and R=14.
19 . The switched reluctance machine of claim 15 wherein S=10 and R=18.
20 . The switched reluctance machine of claim 15 further including a plurality of windings, each of the windings surrounding a respective stator pole.
21 . The switched reluctance machine of claim 20 further including an electrical control circuit operably attached to the plurality windings.
22 . The switched reluctance machine of claim 15 wherein the number of stator poles is double a number of phases.
23 . The switched reluctance machine of claim 15 wherein one pair of stator poles is energized per phase of the switched reluctance machine.