DYNAMO-ELECTRIC MACHINE ROTOR

• US 20070252473A1
• Filed: 04/27/2007
• Published: 11/01/2007
• Est. Priority Date: 04/28/2006
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Taniyama, Yoshihiro, Abe, Shozo, Tani, Takaharu, Shimanuki, Kenmei, Shiomi, Hidekazu, Kabata, Yasuo
• Granted Patent: US 7,812,501 B2
• Time in Patent Office: Days
• US Class Current: 310/270
• CPC Class Codes: H02K 1/32 with channels or ducts for flow of cooling medium

Abstract

It is an object of this invention to provide a dynamo-electric machine rotor which effectively and uniformly cools a rotor coil outside a rotor core by forming a ventilating groove in the rotor coil, tolerates large field current, and has high reliability. There is provided a dynamo-electric machine rotor in which spaced core slots are formed in a cylindrical rotor core 30, rotor coils 10 of stacked turns are fitted into the core slots to form multiple nested rings around a magnetic pole of the rotor, ends of the rotor coils are fixed by an retaining ring, and a spacer 20 is arranged in each of circumferential gaps between the ends of the rotor coils, wherein each spacer 20 has a length not more than the lengths of linear portions 12 at the ends of corresponding ones of the rotor coils 10, a cut-out 22 for ventilation of coolant gas is formed across at least one of two sides of the spacer, and the spacer is in contact with the rotor coils at the two sides of the spacer at a position located furthest inside in the radial direction of the rotor and an arbitrary position.

Claims

1. A dynamo-electric machine rotor in which spaced core slots are formed in a cylindrical rotor core, rotor coils of stacked turns are fitted into the core slots to form multiple nested rings around a magnetic pole of the rotor, ends of the rotor coils are fixed by an retaining ring, and a spacer is arranged in each of circumferential gaps between the ends of the rotor coils,

wherein each spacer has a length not more than lengths of linear portions at the ends of corresponding ones of the rotor coils, a cut-out is formed across at least one of two sides of the spacer which are in contact with the linear portions at the ends of the corresponding rotor coils except for a portion located inward in a radial direction of the rotor and an arbitrary portion to form a coolant gas ventilating channel having an axial extremity which communicates with a through hole formed in a tooth of the rotor core, and the spacer is in contact with the rotor coils at the portion located inward in the radial direction of the rotor and the arbitrary portion serving as remaining portions.

2. The dynamo-electric machine rotor according to claim 1, wherein

the spacer has contacting portions which are in contact with the coils at the two sides at a position located inward in a radial direction of the rotor and an arbitrary position and has a cut-out portion in at least one of the sides except for the contacting portions for ventilation of coolant gas, and the cut-out is meandering.

3. The dynamo-electric machine rotor according to claim 2, wherein

the spacer has an extension which diagonally extends downward from an extremity of the contacting portion at the arbitrary position to a portion located furthest inside in a radial direction of the rotor at an extremity on a curved portion side of the coil.

4. The dynamo-electric machine rotor according to claim 1, wherein

the spacer has contacting portions which are in contact with the coils at the two sides along more than half of the linear portion of each of the coils from an extremity on a rotor core side, at a position located inward in a radial direction of the rotor and an arbitrary position.

5. A dynamo-electric machine comprising a rotor according to claim 1.

6. A dynamo-electric machine rotor in which spaced core slots are formed in a cylindrical rotor core, rotor coils of stacked turns are fitted into the core slots to form multiple nested rings around a magnetic pole of the rotor, ends of the rotor coils are fixed by an retaining ring, and a spacer is arranged in each of circumferential gaps between the ends of the rotor coils,

wherein each spacer has a length not more than lengths of linear portions at the ends of corresponding ones of the rotor coils, a cut-out is formed across at least one of two sides of the spacer which are in contact with the linear portions at the ends of the corresponding rotor coils except for a portion located inward in a radial direction of the rotor and an arbitrary portion to form a coolant gas ventilating channel having an axial extremity which bends toward space formed below the rotor coils, and the spacer is in contact with the rotor coils at the portion located inward in the radial direction of the rotor and the arbitrary portion serving as remaining portions, and

a subslot which communicates with the space formed below the rotor coils is formed in the rotor core.

7. The dynamo-electric machine rotor according to claim 6, wherein

the spacer has contacting portions which are in contact with the coils at the two sides at a position located inward in a radial direction of the rotor and an arbitrary position and has a cut-out portion in at least one of the sides except for the contacting portions for ventilation of coolant gas, and the cut-out is meandering.

8. The dynamo-electric machine rotor according to claim 7, wherein

the spacer has an extension which diagonally extends downward from an extremity of the contacting portion at the arbitrary position to a portion located furthest inside in a radial direction of the rotor at an extremity on a curved portion side of the coil.

9. The dynamo-electric machine rotor according to claim 6, wherein

the spacer has contacting portions which are in contact with the coils at the two sides along more than half of the linear portion of each of the coils from an extremity on a rotor core side, at a position located inward in a radial direction of the rotor and an arbitrary position.

10. The dynamo-electric machine rotor according to claim 6, wherein

in the spacer, an extremity in an axial direction of the rotor of a contacting portion is extended to below the coils.

11. A dynamo-electric machine comprising a rotor according to claim 6.