Stator for an electric motor

Patent metadata

Field	Value
Publication number	US-9627937-B2
Application number	US-201314093752-A
Country	US
Kind code	B2
Filing date	Dec 2, 2013
Priority date	Dec 2, 2013
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

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.

First claim

The invention claimed is:

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.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Wisnewski Mark A
• Trzcinski David J
• Ivan William T
• Fan Yue

Classifications

• H02K3/345 Primary

  between conductor and core, e.g. slot insulation · CPC title

• H02K3/325

  for windings on salient poles, such as claw-shaped poles · CPC title

• H02K3/30

  Windings characterised by the insulating material · CPC title

• H02K1/14 Primary

  Stator cores with salient poles · CPC title

• H02K3/20

  for auxiliary purposes, e.g. damping or commutating · CPC title