Patent ID: 7166984
Filing Date: 2007-01-23
Classification: H02K

Abstract:
1. A brushless repulsion motor comprising: a stator having an integer number Ns stator poles and at least one field winding producing a stator field having 2Ns torque sectors of alternating first and second opposite torque polarities, Ns being a positive integer greater than 1; a signaling system mounted in a fixed position relative to the stator and including one or more signaling devices individually adapted to selectively provide a control signal; a rotor rotatably mounted relative to the stator for rotation about an axis between the stator poles, the rotor comprising Nrc rotor coil circuits, Nrc being a positive integer greater than 0, the rotor coil circuits individually comprising: a rotor coil comprising Nrcs rotor coil segments adapted to electromagnetically interact with the stator field, Nrcs being a positive integer greater than 1, an electronic switch circuit comprising at least one electronic switch to selectively short the rotor coil in response to a switch signal, the stator field operating to induce current in the rotor coil when the rotor coil is shorted to produce a resultant relative torque and rotation between the rotor and the stator, and a detector located on the rotor to rotate past the signaling system in a circular path about the axis and to selectively receive the control signal when the rotor coil is in a predetermined angular position relative to the stator poles, the detector providing the switch signal to the electronic switch circuit to short the rotor coil when the control signal is received; wherein each detector is angularly spaced from a closest neighboring detector by a detector angle that is greater than 360°/(Nrc*Nrcs).