Electrical Machine and Vehicle Drive Device Equipped with the Same

• US 20090115282A1
• Filed: 10/22/2008
• Published: 05/07/2009
• Est. Priority Date: 10/23/2007
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Ito, Masaru, Fujiwara, Shin, NISHIDATE, Keisuke, Obara, Shingo
• Application Number:
  US12/256,278
• Publication Number:
  US 20090115282A1
• Time in Patent Office: Days
• US Class Current: 310/216.55
• CPC Class Codes: H02K 1/146 consisting of a generally annular yoke with salient poles
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence

Abstract

An electrical machine includes a stator that includes: a yoke formed with laminated annular steel sheets; and a plurality of magnetic poles which protrude towards an inner diameter side of the yoke and on which a field coil is wound. In the stator, a radial width of apart of the yoke corresponding to a magnetic pole width is broader to an outer diameter side than a radial width of a part of the yoke provided throughout between the magnetic poles; and the stator is provided with a thorough-hole for a tightening bolt in the part of the yoke with the broad radial width.

Claims

1. An electrical machine, comprising:

a stator that comprises;

a yoke formed with laminated annular steel sheets; and

a plurality of magnetic poles which protrude towards an inner diameter side of the yoke and on which a field coil is wound, wherein;

in the stator, a radial width of a part of the yoke corresponding to a magnetic pole width is broader to an outer diameter side than a radial width of a part of the yoke provided throughout between the magnetic poles; and

the stator is provided with a thorough-hole for a tightening bolt in the part of the yoke with the broad radial width.

2. An electrical machine according to claim 1, wherein:

the stator is sandwiched by two brackets and fixed by a bolt passing through the through-hole.

3. An electrical machine according to claim 2, wherein:

one of the two brackets is a bracket of a part to which an output shaft of the electrical machine is connected and which is provided with a drive mechanism.

4. An electrical machine according to claim 1, wherein:

a shape of an outer periphery of the stator is a quadrilateral.

5. An electrical machine according to claim 1, wherein:

a shape of an outer periphery of the stator is a quadrilateral;

a number of the magnetic poles which protrude inward is a same as a number of angles of the quadrilateral; and

as many the through-holes as the angles of the quadrilateral are arranged in a back yoke width which corresponds to the magnetic pole width extended to the outer diameter side.

6. An electrical machine according to claim 1, wherein:

a shape of an outer periphery of the stator is a quadrilateral, and the magnetic poles and the through-holes are disposed in positions that include diagonal line segments of the quadrilateral.

7. An electrical machine according to claim 1, wherein:

a shape of an outer periphery of the stator is a quadrilateral, and the magnetic poles and the through-holes are disposed in symmetric positions on the diagonal line segments of the quadrilateral.

8. An electrical machine according to claim 1, wherein:

a shape of an outer periphery of the stator is a polygon.

9. An electrical machine according to claim 1, wherein:

a shape of an outer periphery of the stator is a polygon;

a number of the magnetic poles which protrude inward is a same as a number of angles of the polygon; and

as many the through-holes as the angles of the polygon are arranged in a back yoke width which corresponds to the magnetic pole width extended to the outer diameter side.

10. An electrical machine according to claim 1, wherein:

a shape of an outer periphery of the stator is a polygon, and the magnetic poles and the through-holes are disposed in positions that include line segments connecting a center and angles of the polygon.

15. A vehicle drive device, comprising:

an electrical machine that drives wheels other than wheels driven by an internal-combustion engine;

an electrical generator that is driven by the internal-combustion engine and that generates electric power for driving the electrical machine to supply the power to the electrical machine; and

a control device that controls drive of the electrical machine and the electrical generator, wherein;

the electrical machine is configured with the electrical machine according to claim 1.

11. An electrical machine, comprising:

a rotor that is rotatably held; and

a stator that is placed opposite to the rotor across a void, and comprises an annular core, a plurality of toothed cores that protrude from a surface of the rotor side of the annular core toward the rotor and that are circumferentially placed at intervals, and a coil that is wound on the plurality of toothed cores, wherein;

the annular core and the plurality of toothed cores are configured so as to establish a relation, Lc<

La<

Lb, where;

La is a circumferential width at an end of an annular core side of the toothed core;

Lb is a minimum radial width of an extension part of the annular core that corresponds to an area of the circumferential width La and that extends on an opposite side of the rotor side of the toothed core; and

Lc is a minimum radial width of a bridge part of the Annular core that connects between circumferentially adjacent extension parts of the annular core.

12. An electrical machine according to claim 11, wherein:

the extension part of the annular core is provided with a through-hole through which a fixing bolt for fixing the stator is inserted.

16. A vehicle drive device, comprising:

an electrical machine that drives wheels other than wheels driven by an internal-combustion engine;

an electrical generator that is driven by the internal-combustion engine and that generates electric power for driving the electrical machine to supply the power to the electrical machine; and

a control device that controls drive of the electrical machine and the electrical generator, wherein

the electrical machine is configured with the electrical machine according to claim 11.

13. An electrical machine, comprising:

a rotor that is rotatably held; and

a stator that is placed opposite to the rotor across a void, and comprises an annular core, a plurality of toothed cores that protrude from a surface of the rotor side of the annular core toward the rotor and that are circumferentially placed at intervals, and a coil that is wound on the plurality of toothed cores, wherein;

the toothed core is formed so that its circumferential width is greater than the minimum radial width of the annular core; and

in the stator, a magnetic circuit is configured so that a magnetic flux, flowing from the rotor side of the toothed core to another side, flows through a part of the annular core whose radial width is greater than the minimum radial width of the annular core and the circumferential width of the toothed core, to a side of the minimum radial width of the annular core.

14. An electrical machine according to claim 13, wherein:

the annular core part with the greater radial width is provided with a through-hole through which a fixing bolt for fixing the stator is inserted.

17. A vehicle drive device, comprising:

an electrical machine that drives wheels other than those driven by an internal-combustion engine;

an electrical generator that is driven by the internal-combustion engine and that generates electric power for driving the electrical machine to supply the power to the electrical machine; and

a control device that controls drive of the electrical machine and the electrical generator, wherein

the electrical machine is configured with the electrical machine according to claim 13.