Generator and electric generating system

• US 20060214528A1
• Filed: 02/17/2006
• Published: 09/28/2006
• Est. Priority Date: 03/25/2005
• Status: Active Grant

• Current Assignee: Mitsubishi Heavy Industries, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Takahashi, Kazuhiko, Ide, Kazumasa, Nakahara, Akihito, Kimura, Mamoru
• Granted Patent: US 7,535,147 B2
• Time in Patent Office: Days
• US Class Current: 310/156.490
• CPC Class Codes: H02K 1/24 Rotor cores with salient poles ; Variable reluctance rotors
• CPC Class Codes: H02K 1/276 Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
• CPC Class Codes: H02K 21/14 with magnets rotating within the armatures

Abstract

The object of the invention is to provide a generator easy to assemble even if there is an obstacle such as a turbine in the axial direction of the rotor of the generator. A generator comprising; a rotor having a permanent magnet placed therein and supported to be rotatable, and a stator having a field coil wound thereon, characterized in that; the rotor is provided with a seating made of a magnetic material for supporting the permanent magnet and a pole shoe made of a magnetic material placed in the outward radial direction of the permanent magnet.

Claims

1. A generator comprising;

a rotor having a permanent magnet placed therein and supported to be rotatable, and a stator having a field coil wound thereon, characterized in that;

the rotor is provided with a seating made of a magnetic material for supporting the permanent magnet and a pole shoe made of a magnetic material placed in the outward radial direction of the permanent magnet.

2. A generator according to claim 1,

further characterized in that;

the width in the circumferential direction of the permanent magnet is greater than that of the seating.

3. A generator according to claim 1,

further characterized in that;

the width in the axial direction of the permanent magnet is greater than that of the seating.

4. A generator according to claim 1,

further comprising;

the permanent magnet is provided with a cover thereon, the cover has convex or concave parts thereon, the seating has concave or convex parts thereon, and the convex or concave parts of the cover is fitted into their corresponding concave or convex parts of the seating.

5. A generator according to claim 1,

further comprising;

the rotor is provided with a pole shoe placed in the outward radial direction of the permanent magnet, the permanent magnet has a cover thereon, the cover has convex or concave parts thereon, the seating has concave or convex parts thereon, and the convex or concave parts of the cover is fitted into their corresponding concave or convex parts of the seating.

6. A generator according to claim 1,

further comprising;

the rotor is provided with a pole shoe placed in the outward radial direction of the permanent magnet, and the pole shoe and the stator have their maximum gap and their minimum gap between them such that the ratio of the maximum gap to the minimum gap is given as 1.25 or more.

8. A generator according to claim 6,

characterized in that;

the pole shoe and the stator have their maximum gap and their minimum gap between them such that the ratio of the maximum gap to the minimum gap is given as 1.2 or more.

9. A generator according to claim 6,

characterized in that;

the pole shoe and the stator have their maximum gap and their minimum gap between them such that the ratio of the maximum gap to the minimum gap is given as 1.33 or more.

10. A generator according to claim 1,

further comprising;

a rotor having a permanent magnet placed therein and supported to be rotatable, a stator having a field windings wound thereon, and the stator is constructed to a plurality of divisions, and the product of the number of the parallel circuits in the field windings on the stator multiplied by that of the field windings equals to the number of the stator divisions.

11. A generator according to claim 10,

characterized in that;

the number of the stator divisions along with the number of the parallel circuits in the field windings on the stator is two.

7. A generator comprising,

a rotor having a permanent magnet placed therein and supported to be rotatable, a stator having a field coil wound thereon, the rotor is provided with a seating for supporting the permanent magnet, characterized in that;

the radius of the arc part of the pole shoe is smaller than the radius of the rotor.

12. An electric generating system comprising;

a rotor having a permanent magnet placed therein and supported to be rotatable, and a stator having a field coil wound thereon, characterized in that;

the rotor is provided with a seating made of a magnetic material for supporting the permanent magnet and a pole shoe made of a magnetic material placed in the outward radial direction of the permanent magnet, and that the rotor is rotated owing to the rotating force applied by a turbine.

13. An Electric Generating System comprising;

a gererator, an exciter and a coupling,

characterized in that;

the exciter is installed between the coupling and a rotor shaft of the generator.

14. An Electric Generating System according to claim 13, characterized in that;

the exciter installed between the coupling and the rotor shaft of the generator is a sub-exciter.