COIL INSULATOR, ARMATURE COIL INSULATED BY THE COIL INSULATOR AND ELECTRICAL ROTATING MACHINE HAVING THE ARMATURE COIL

• US 20090072654A1
• Filed: 03/05/2008
• Published: 03/19/2009
• Est. Priority Date: 03/06/2007
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Nagano, Susumu, Tsuchiya, Hiroyoshi, Sekito, Shinobu, Yamada, Toshimitsu, Yoshida, Katsuhiko, Hatano, Hiroshi
• Granted Patent: US 7,973,243 B2
• Time in Patent Office: Days
• US Class Current: 310/215
• CPC Class Codes: H02K 3/40 for high voltage, e.g. affording protection against corona discharges

Abstract

A coil insulator of an electrical rotating machine used as a main insulator for insulating a bundle of conductors formed of a plurality of insulated wires to form an armature coil provided in a slot of a rotor core or a stator core of an electrical rotating machine, wherein the coil insulator includes a mica layer including at least one of a peeled-off mica and a composite mica, a woven- or unwoven cloth including at least one of inorganic and organic materials, hexagonal crystal boron nitride particles having a graphitization index of 1.8 or more, and thermosetting polymer organic resin which integrally connects the mica layer and the hexagonal crystal boron nitride particles to each other, and the hexagonal crystal boron nitride particles is oriented in a longitudinal direction of the coil.

Claims

1. A coil insulator of an electrical rotating machine used as a main insulator for insulating a bundle of conductors formed of a plurality of insulated wires to form an armature coil provided in a slot of a rotor core or a stator core of an electrical rotating machine,

wherein the coil insulator comprises:

a mica layer including at least one of a peeled-off mica and a composite mica;

a woven- or unwoven cloth formed of at least one of inorganic and organic materials;

hexagonal crystal boron nitride particles having a graphitization index of 1.8 or higher; and

thermosetting polymer organic resin for forming an integrated configuration of the mica layer and the hexagonal crystal boron nitride particles, and

wherein the hexagonal crystal boron nitride particles is oriented in a longitudinal direction of the armature coil.

6. The coil insulator of an electrical rotating machine according to claim 1,

wherein the graphitization index (GI) is a value expressed by following equation using peak areas of (100) plane, (101) plane and (102) plane of boron nitride in an X-ray diffracted image:

GI=(S(100)+S(101))/S(102)

where S(100), S(101) and S(102) represent the peak areas of the (100) plane, (101) plane and (102) plane, respectively.

11. An armature coil of an electrical rotating machine comprising:

a coil conductor; and

a coil insulator coated on the coil conductor,

wherein the coil insulator has the structure described in any one of claims 1 to 10.

12. An electrical rotating machine comprising:

a rotor; and

a stator having an armature coil opposed to the rotor,

wherein the armature coil has the structure described in claim 11.

2. A coil insulator of an electrical rotating machine used as a main insulator for insulating a bundle of conductors formed of a plurality of insulated wires to form an armature coil provided in a slot of a rotor core or a stator core of an electrical rotating machine,

wherein the coil insulator comprises:

a resin-applied mica tape including a mica layer containing at least one of a peeled-off mica and a composite mica;

a woven- or unwoven cloth formed of at least one of inorganic and organic materials;

polymer organic resin which adheres the mica layer and the cloth to each other to form the resin-applied mica tape; and

an organic resin layer containing hexagonal crystal boron nitride particles having a graphitization index of 1.8 or more to at least one of a surface of the resin-applied mica tape opposed to the cloth and an opposed surface of the mica layer, and

wherein the resin-applied mica tape is wound around the bundle of the conductors, and

thermosetting polymer organic resin is impregnated in the mica tape, shaped and hardened.

7. The coil insulator of an electrical rotating machine according to claim 2,

wherein the graphitization index (GI) is a value expressed by following equation using peak areas of (100) plane, (101) plane and (102) plane of boron nitride in an X-ray diffracted image:

GI=(S(100)+S(101))/S(102)

where S(100), S(101) and S(102) represent the peak areas of the (100) plane, (101) plane and (102) plane, respectively.

3. A coil insulator of an electrical rotating machine used as a main insulator for insulating a bundle of conductors formed of a plurality of insulated wires to form an armature coil provided in a slot of a rotor core or a stator core of an electrical rotating machine,

wherein the coil insulator comprises:

a mica tape configured of a composite mica paper in which hexagonal crystal boron nitride particles having a graphitization index of 1.8 or more is mixed with mica foil;

a woven- or unwoven cloth made of at least one of inorganic and organic materials; and

a polymer organic resin to adhere the composite mica paper and the cloth to each other, and

wherein the mica tape is wound around the bundle of conductors, impregnated with thermosetting polymer organic resin and then, hardened.

8. The coil insulator of an electrical rotating machine according to claim 3,

wherein the graphitization index (GI) is a value expressed by following equation using peak areas of (100) plane, (101) plane and (102) plane of boron nitride in an X-ray diffracted image:

GI=(S(100)+S(101) )/S(102)

where S(100), S(101) and S(102) represent the peak areas of the (100) plane, (101) plane and (102) plane, respectively.

4. A coil insulator of an electrical rotating machine used as a main insulator for insulating a bundle of conductors formed of a plurality of insulated wires to form an armature coil provided in a slot of a rotor core or a stator core of an electrical rotating machine,

wherein the coil insulator comprises:

a mica layer including at least one of a peeled-off mica and a composite mica;

a woven- or unwoven cloth formed of at least one of inorganic and organic materials; and

thermosetting semi-hardened polymer organic resin which adheres the mica layer and the cloth to each other; and

wherein the mica tape coated on at least one of a surface opposed to the cloth and a surface opposed to the mica layer with organic resin including hexagonal crystal boron nitride particles having at least a graphitization index of 1.8 or more is wound around the bundle of conductors, shaped under pressure, and hardened under heated condition.

9. The coil insulator of an electrical rotating machine according to claim 4,

wherein the graphitization index (GI) is a value expressed by following equation using peak areas of (100) plane, (101) plane and (102) plane of boron nitride in an X-ray diffracted image:

GI=(S(100)+S(101) )/S(102)

where S(100), S(101) and S(102) represent the peak areas of the (100) plane, (101) plane and (102) plane, respectively.

5. A coil insulator of an electrical rotating machine used as a main insulator for insulating a bundle of conductors formed of a plurality of insulated wires to form an armature coil provided in a slot of a rotor core or a stator core of an electrical rotating machine,

wherein the coil insulator comprises:

a mica tape including a composite mica layer in which hexagonal crystal boron nitride particles having at least a graphitization index of 1.8 or more is mixed;

a woven- or unwoven cloth formed of at least one of inorganic and organic materials; and

thermosetting semi-hardened polymer organic resin which adheres the composite mica layer and the cloth to each other; and

wherein the mica tape is wound around the bundle of conductors, shaped under pressure, and hardened under heated condition.

10. The coil insulator of an electrical rotating machine according to claim 5,

wherein the graphitization index (GI) is a value expressed by following equation using peak areas of (100) plane, (101) plane and (102) plane of boron nitride in an X-ray diffracted image:

GI=(S(100)+S(101) )/S(102)

where S(100), S(101) and S(102) represent the peak areas of the (100) plane, (101) plane and (102) plane, respectively.