Stator for an electric motor
View Patent ↗A stator for an electric motor includes a plurality of pole pieces and a plurality of electrical windings associated with the pole pieces. Each winding includes a cable having an electrically conductive element. A lossy insulative material is located between the electrical windings and the associated pole pieces.
1. An electric motor system, comprising:
a stator comprising a plurality of pole pieces;
a plurality of electrical windings associated with the pole pieces, each winding comprising a cable including an electrically conductive element; and
a lossy insulative material located between the electrical windings and the associated pole pieces wherein the lossy insulative material comprises an electrically insulative material having a bulk resistance that electrically loads an equivalent electric resonance circuit comprising a parasitic capacitance between said pole pieces and said electrical windings to one of a critically damped or an overdamped condition.
2. The stator of claim 1 , wherein the lossy insulative material has a bulk resistance between a fraction of an ohm and 50 ohms when the electric resonance circuit has a parasitic capacitance range that is between one hundred picofarads and three thousand picofarads.
3. The stator of claim 1 , wherein the lossy insulative material comprises one or more of carbon, metal film, polymer and semiconductor materials.
4. The stator of claim 2 , wherein the lossy insulative material located between the electrical windings and the associated pole pieces comprises the lossy insulative material applied to the pole piece.
5. The stator of claim 2 , wherein the lossy insulative material located between the electrical windings and the associated pole pieces comprises the lossy insulative material applied to the electrical windings.
6. The stator of claim 2 , wherein the lossy insulative material located between the electrical windings and the associated pole pieces comprises the lossy insulative material combined with a binding material, formed into a sheet and inserted into each of the slots between the electrical windings and the associated pole pieces.
7. An electric motor system, comprising:
a stator comprising plurality of pole pieces, each pole piece comprising a ferromagnetic material coated with a lossy insulative material; and
a plurality of electrical windings associated with the pole pieces, each winding comprising a cable, said cable comprising an electrically conductive element coated with an insulative sheath comprising the lossy insulative material wherein the lossy insulative material comprises an electrically insulative material having a bulk resistance that electrically loads an equivalent electric resonance circuit comprising a parasitic capacitance between said pole pieces and said electrical windings to one of a critically damped or an overdamped condition.
8. The stator of claim 7 , wherein the lossy insulative material has a bulk resistance between a fraction of an ohm and 50 ohms when the electric resonance circuit has a parasitic capacitance range that is between one hundred picofarads and three thousand picofarads.
9. The stator of claim 7 , wherein the lossy insulative material comprises one or more of carbon, metal film, polymer and semiconductor materials.