Electric machine

Patent metadata

Field	Value
Publication number	US-9647498-B2
Application number	US-201314374105-A
Country	US
Kind code	B2
Filing date	Jan 21, 2013
Priority date	Jan 23, 2012
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

An electric machine, especially a transversal flux machine, the stator being composed of a stack of phase segments, each phase segment having at least one stator segment and one stator winding, especially a single winding, each stator segment having an annular stator bridge, on which pole shoes are premolded, which in particular extend in the radially inward direction, and/or which extend in the direction of the rotor and/or which are situated between the rotor and the annular stator bridge, the pole shoes having the same shape, in particular, the axial width of the pole shoe decreasing with increasing radial clearance, the associated profile being disposed between a first and a second profile, the first profile being a linear function of the radial clearance, the pole back associated with the first profile being a planar area, in particular, the second profile being a circular function, in particular a circular segment function, the pole back associated with the second profile being a cylindrical section area, in particular.

First claim

The invention claimed is:

1. An electric machine, comprising:
a stator including a stack of stator phase segments, each phase segment including at least one stator segment and at least one stator winding; and
a plurality of pole shoes, each stator segment including an annular stator bridge on which the pole shoes are premolded, the pole shoes having the same shape; and
a housing component in which the stack is accommodated, the housing component including an axially extending cable channel, and an axially extending depression on a surface thereof facing the stack, wherein the housing component is connected to the stack one of:
in a force-locking manner, and
by being one of thermally shrink-fitted on and bonded to the stack.

2. The electric machine as recited in claim 1 , wherein the electric machine is a transversal flux machine.

3. The electric machine as recited in claim 1 , wherein the depression faces an inner surface of the stack.

4. The electric machine as recited in claim 1 , wherein each stator segment has two radially extending depressions that are set apart from each other by one half of a pole shoe clearance in a circumferential direction.

5. The electric machine as recited in claim 4 , wherein the depressions are slots.

6. The electric machine as recited in claim 4 , wherein the depressions are located on a side of the stator segment that faces a respective other stator segment of a same phase segment.

7. The electric machine as recited in claim 6 , wherein the side of the stator segment is a front end.

8. The electric machine as recited in claim 5 , wherein when joining two stator segments to form an individual phase segment, the slots are able to be brought into congruence to form a passage for at least one of an incoming line and an outgoing line of an individual stator winding.

9. The electric machine as recited in claim 1 , wherein:
at least one pole shoe has a width in a circumferential direction that increases with an increasing radial clearance, and
with increasing radial clearance, the width in the circumferential direction increases to the extent that an axial width decreases.

10. The electric machine as recited in claim 9 , wherein the width in the circumferential direction increases in inverse proportion to the extent that the axial width decreases.

11. The electric machine as recited in claim 1 , wherein at least one pole shoe has a planar design on a side thereof facing away from another stator segment.

12. The electric machine as recited in claim 11 , wherein the at least one pole shoe has the planar design on a side thereof facing away from the other stator segment in order to allow a tightest and contacting design of the stack of the phase segments.

13. The electric machine as recited in claim 9 , wherein an associated profile of the axial width as a function of the radial clearance is made up of two segments that are not parallel with each other, each being a linear function of the radial clearance, and wherein a pole back includes two planar surface pieces.

14. The electric machine as recited in claim 13 , wherein the two planar surfaces are non-parallel with each other.

15. The electric machine as recited in claim 9 , wherein an associated profile of the axial width as a function of the radial clearance includes at least one of a bulbous section and a convex section, the concave section having an arc length that is at least five times shorter than the bulbous section.

16. The electric machine as recited in claim 1 , wherein:
at least one of:
an air-gap-side surface of at least one pole shoe has one of an area value of the same magnitude and an area value that differs by maximally 20% in comparison with a transition area toward the stator bridge, and
the pole shoe has a pole back,

the pole back at least one of at least partially faces in a direction of the stator winding and at least partially faces in a direction of another stator segment,
the pole back connects the air-gap-side surface of the pole shoe facing the rotor with the stator bridge, and
the pole back includes a bulbous shape and includes two planar surface pieces that are not parallel with each other.

17. The electric machine as recited in claim 16 , wherein the pole back faces a stator bridge surface.

18. The electric machine as recited in claim 1 , wherein:
at least one of:
at least one pole shoe is formed in such a way that essentially no subregion of the pole shoe goes into saturation as long as a surface area of an air-gap-side side surface of the pole shoe does not go into saturation yet, and
an axial width of the pole shoe decreases with increasing radial clearance,

an associated profile is disposed between a first and a second profile,
the first profile is a linear function of the radial clearance, a pole back associated with the first profile being a planar area, and
the second profile is a circular function, a pole back associated with the second profile a cylindrical section area.

19. The electric machine as recited in claim 18 , wherein the air-gap-side side surface faces the rotor.

20. The electric machine as recited in claim 18 , wherein the circular function is a circular segment function.

21. The electric machine as recited in claim 1 , wherein:
at least one of:
a pole shoe has a form that is symmetrical with a plane of symmetry, the plane of symmetry running through a center of mass of the pole shoe and being defined by a radial direction starting from the center of mass, and the axial direction, and
the pole shoe has a form that is symmetrical with the plane of symmetry, the plane of symmetry running through the center of mass of the pole shoe, and a direction of a surface normal being a tangential direction at the center of mass.

22. The electric machine as recited in claim 1 , wherein an edge of a pole shoe has a broader shape to reduce a risk of an edge fracture.

23. The electric machine as recited in claim 1 , wherein:
with increasing radial clearance, an area value of a surface of intersection of a pole shoe with regard to a first area is one of equal to an area value of an air-gap-side side surface of the pole shoe and at least deviates by less than 10% or 20%, wherein one of:
a first surface is a tangential plane and at least one of:
the tangential plane has an individual radial clearance with respect to a rotor shaft axis,
the tangential plane is aligned parallel to the rotor shaft axis,
the tangential plane has the radial clearance,
the tangential plane is aligned perpendicularly to an axis of symmetry, and
the tangential plane has a normal direction that connects the rotor shaft axis to a center of mass of the pole shoe, and

the first area is a cylinder sleeve area that at least one of:
has the individual radial clearance with respect to the rotor shaft axis, and
is aligned parallel to the rotor shaft axis.

24. The electric machine as recited in claim 23 , wherein the air-gap-side side surface faces a rotor.

25. The electric machine as recited in claim 1 , wherein at least one of:
at least one stator segment is made from one of pressed iron powder and sintered iron powder, and
the stator winding is extrusion-coated by insulating plastic.

26. The electric machine as recited in claim 25 , wherein the one of the pressed iron powder and the sintered iron powder includes SMC.

27. A method for producing an

Assignees

• Sew Eurodrive Gmbh & Co Kg

Inventors

• Dreher Florian

Classifications

• H02K5/04

  Casings or enclosures characterised by the shape, form or construction thereof · CPC title

• Y10T29/49009

  Dynamoelectric machine · CPC title

• H02K15/022

  with salient poles · CPC title

• H02K1/145 Primary

  having an annular coil, e.g. of the claw-pole type · CPC title

• H02K3/525

  Annular coils, e.g. for cores of the claw-pole type · CPC title