Hybrid field electric motor

Patent metadata

Field	Value
Publication number	US-10476324-B2
Application number	US-201313799449-A
Country	US
Kind code	B2
Filing date	Mar 13, 2013
Priority date	Jul 6, 2012
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A hybrid field electric motor includes a rotor with a rotor core rotating about an axial axis and having a rotor surface with at least one sloping edge face and a radial edge face. The stator includes a stator core and radial pole faces spaced by a gap from the radial edge face of the rotor for radially directing flux into the rotor core. The stator has sloping pole faces spaced from the sloping edge face of the rotor core for flux directed into the rotor core at an angle between radial and axial. The rotor core and/or stator core are made of a soft magnetic composite material for flux in inure than one plane in the core(s).

First claim

The invention claimed is:

1. A hybrid field electric motor comprising:
a rotor with a rotor core rotating about a single axial axis and having a flat radial edge face and a flat sloping edge face on opposite sides of the flat radial edge face;
a stator including a stator core and radial pole faces spaced by a gap from the radial edge face of the rotor for radially directing flux into the rotor core, wherein the gap spacing the stator core from the radial edge face of the rotor is a conical air gap, the stator further including a flat sloping pole face for each flat sloping edge face of the rotor core for flux directed into the rotor core at an angle between radial and axial; and
wherein the flux directed from both the radial pole faces of the stator and the flat sloping pole faces of the stator cause the rotor to rotate about the single axial axis; and
the rotor core and/or stator core made of a soft magnetic composite material having substantially isotropic magnetic behavior;
wherein a central plane normal to the single axial axis extends through the stator and the rotor to allow a flux flow between the rotor and the stator across the conical air gap in a three-dimensional flux path such that the flux flow does not cross the central plane.

2. The motor of claim 1 in which the rotor is inside the stator and said rotor surface with at least one flat sloping edge face and a radial edge face are on an outer periphery of the rotor.

3. The motor of claim 1 in which the stator is inside the rotor and the rotor surface with at least one flat sloping edge face and a radial edge face are on an inner periphery of the rotor.

4. The motor of claim 1 in which the rotor includes a permanent magnet on said flat sloping edge face and said radial edge face.

5. The motor of claim 1 in which the stator radial pole faces are offset from the stator core.

6. The motor of claim 1 in which the stator includes windings configured as a salient pole hybrid field motor.

7. The motor of claim 1 in which the stator includes windings configured as a distributed pole hybrid field motor.

8. The motor of claim 1 further including cooling channels integrally formed within the soft magnet composite material.

9. The motor of claim 1 in which the motor defines a plurality of magnetic circuits each having more than one winding.

10. A hybrid field electric motor comprising:
a rotor with a rotor core rotating about a single axial axis and having a flat radial edge face and a flat sloping edge face on opposite sides of the flat radial edge face;
a stator including a stator core and radial pole faces spaced by a gap from the radial edge face of the rotor for radially directing flux into the rotor core, wherein the gap spacing the stator core from the radial edge face of the rotor is a conical air gap, the stator further including a flat sloping pole face for each flat sloping edge face of the rotor core for flux directed into the rotor core at an angle between radial and axial;
wherein the flux directed from both the radial pole faces of the stator and the flat sloping pole faces of the stator cause the rotor to rotate about the single axial axis; and
the rotor core and/or stator core made of a soft magnetic composite material having substantially isotropic magnetic behavior;
wherein a central plane normal to the single axial axis extends through the stator and the rotor to allow a flux flow between the rotor and the stator across the conical air gap in a three-dimensional flux path such that the flux flow does not cross the central plane; and
one or more cooling channels formed in the soft magnetic composite material.

11. The motor of claim 10 in which the rotor includes a flat permanent magnet on said sloping edge face and said radial edge face.

12. The motor of claim 10 in which the rotor includes a flat sloping edge face on each side of the radial edge face.

13. The motor of claim 12 in which the stator includes a flat sloping pole face for each sloping edge face of the rotor core.

14. A hybrid field electric motor comprising:
a rotor with a rotor core rotating about a single axial axis and having a flat radial edge face and a flat sloping edge face on opposite sides of the flat radial edge face;
a stator including a stator core and radial pole faces spaced by a gap from the radial edge face of the rotor for radially directing flux into the rotor core, wherein the gap spacing the stator core from the radial edge face of the rotor is a conical air gap, the stator further including a flat sloping pole face for each flat sloping edge face of the rotor core for flux directed into the rotor core at an angle between radial and axial; and
wherein the flux directed from both the radial pole faces of the stator and the flat sloping pole faces of the stator cause the rotor to rotate about the single axial axis; and
the rotor core and/or stator core made of a soft magnetic composite material having substantially isotropic magnetic behavior; and
a plurality of magnetic circuits each having more than one winding;
wherein a central plane normal to the single axial axis extends through the stator and the rotor to allow a flux flow between the rotor and the stator across the conical air gap in a three-dimensional flux path such that the flux flow does not cross the central plane.

15. The motor of claim 14 in which the rotor includes a flat permanent magnet on said sloping edge face and said radial edge face.

16. The motor of claim 14 in which the rotor includes a flat sloping edge face on opposite sides of the radial edge face.

17. The motor of claim 16 in which the stator includes a flat sloping pole face for each sloping edge face of the rotor core.

18. The motor of claim 14 further including cooling channels integrally formed within the soft magnet composite material.

Assignees

• Persimmon Tech Corporation

Inventors

• Hosek Martin
• Sah Sripati

Classifications

• H02K21/44

  with armature windings wound upon the magnets · CPC title

• H02K21/145

  having an annular armature coil (with homopolar co-operation H02K21/20) · CPC title

• H02K21/125

  having an annular armature coil (H02K21/14 - H02K21/24 take precedence) · CPC title

• H02K1/02

  characterised by the magnetic material · CPC title

• H02K1/32 Primary

  with channels or ducts for flow of cooling medium · CPC title