Rotary electric power generator

• US 20020185921A1
• Filed: 08/13/2002
• Published: 12/12/2002
• Est. Priority Date: 09/17/1999
• Status: Active Grant

• Current Assignee: Hideaki Mori, Kenichi Hattori, Masayuki Kaiho, Ryoichi Shiobara, Shigekazu Kieda
• Original Assignee: Hideaki Mori, Kenichi Hattori, Masayuki Kaiho, Ryoichi Shiobara, Shigekazu Kieda
• Inventors: Hattori, Kenichi, Mori, Hideaki, Shiobara, Ryoichi, Kaiho, Masayuki, Kieda, Shigekazu
• Granted Patent: US 6,774,515 B2
• Time in Patent Office: Days
• US Class Current: 310/58
• CPC Class Codes: H02K 15/0414 Windings consisting of separate elements, e.g. bars, hairpins, segments, half coils
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors

Abstract

A turbine electric power generator is provided with winding slots and sub-slots of a rotor; rotor windings having conductors and insulation materials laminated alternately thereon; wedges; and radial ventilation flow passages communicating the sub-slots with through holes of the wedges. In this turbine electric power generator, a projection is provided on an inner face of the radial ventilation flow passages, and the projection height is changed at a rotational axial position. In this manner, there can be provided a gas cooling type rotary electric power generator for turbine with its high cooling performance and high reliability at a low cost.

Claims

1. A rotary electric power generator, comprising:

a rotor;

axial winding slots on the peripheral face of the rotor disposed with intervals in the circumferential direction at both sides of the magnetic pole parts of the rotor;

sub-slots opening at the bottom of the winding slots;

rotor windings arranged coaxially with respect to the magnetic pole, extending at and outside of the winding slots, and having conductor insulation materials laminated alternately thereon;

wedges in which the rotor windings are fixed to the rotor in the winding slots;

a retaining ring on the rotary shaft peripheral side of the rotary windings, the retaining ring extending outside of the winding slots at both ends of the rotor; and

insulation blocks of the rotor windings interposed between wedges or retaining rings, the rotor windings having a number of radial ventilation flow passages passing from the sub-slots to the insulation blocks and wedges,

wherein a projection or rib is provided at the inner face of the radial flow passage with respect to the flow direction of the cooling fluid in the radial flow passage.

3. The rotary electric power generator as set forth in claim 1, wherein a projection is provided on the inner face of a hole configuring the radial flow passage.

4. The rotary electric power generator as set forth in claim 1, wherein the hole width of the conductor insulation material is smaller than the hole width of the conductor.

6. The rotary electric power generator as set forth in claim 1, wherein a projection height from the inner face of the radial flow passage of the projection or rib is greater at a center of the rotor, and is smaller at an end of the rotor.

7. The rotary electric power generator as set forth in claim 1, wherein the projection or rib is provided only at a radial flow passage group of the rotor center.

8. The rotary electric power generator as set forth in claim 1, wherein the projection or rib is provided only at an outer diameter side turn group of the radial flow passage.

9. The rotary electric power generator as set forth in claim 3, wherein the radial flow passage is punched, and then, the periphery of the punched hole is plastically deformed by pressurization.

2. A rotary electric power generator, comprising:

a rotor;

axial winding slots on the peripheral face of the rotor disposed with intervals in a circumferential direction at both sides of the magnetic pole part of the rotor;

sub-slots opening at the bottom of the winding slots;

rotor windings arranged coaxially with respect to the magnetic pole, extending at and outside of the winding slots, and having conductor insulation materials laminated alternately thereon;

wedges in which the rotor windings are fixed to the rotor in the winding slots;

a retaining ring on the rotary shaft peripheral side of the rotary windings, the retaining ring extending outside of the winding slots at both ends of the rotor; and

insulation blocks of the rotor windings interposed between the wedges or the retaining rings, the rotor windings having a number of radial flow passages passing from the sub-slots to the insulation blocks and the wedges;

wherein a flow passage area for the radial flow passage is changed with a predetermined pitch, and a ratio of a maximum area to a minimum area for the radial flow passage is 2 or less.

5. The rotary electric power generator as set forth in claim 2, wherein the hole widths of the adjacent conductors are changed alternately.

10. A rotor of the rotary electric power generator, comprising:

a rotor;

axial winding slots on the peripheral face of the rotor disposed with intervals in a circumferential direction at both sides of the magnetic pole part of the rotor;

sub-slots opening at the bottom of the winding slots;

rotor windings arranged coaxially with respect to the magnetic pole, extending at and outside of the winding slots, and having conductor insulation materials laminated alternately thereon;

wedges in which the rotor windings are fixed to the rotor in the winding slots;

a retaining ring on the rotary shaft peripheral side of the rotary windings, the retaining ring extending outside of the winding slots at both ends of the rotor; and

insulation blocks of the rotor windings interposed between the wedges or the retaining rings, the rotor windings having a ventilation flow passage in which a number of longitudinal flow passages and radial flow passages communicates from a rotor inner diameter side with the insulation blocks and the wedges, and the longitudinal and radial flow passages are combined with each other;

wherein the longitudinal flow passages each having a protrusive projection are provided with respect to the flow direction of the cooling fluid.

11. The rotary electric power as set forth in claim 10, wherein the longitudinal flow passage having a protrusive cut projection with its V shaped tip end is provided with respect to an upstream direction of the cooling fluid.