IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0754047
(2010-04-05)
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등록번호 |
US-7847456
(2011-01-31)
|
우선권정보 |
JP-2006-316444(2006-11-24) |
발명자
/ 주소 |
- Kori, Daisuke
- Fujigaki, Tetsuo
- Aizawa, Shuji
- Iizuka, Motonobu
- Iwai, Yasushi
- Mikami, Hiroyuki
- Kimura, Mamoru
|
출원인 / 주소 |
|
대리인 / 주소 |
Antonelli, Terry, Stout & Kraus, LLP.
|
인용정보 |
피인용 횟수 :
9 인용 특허 :
8 |
초록
▼
A permanent magnet electrical rotating machine having a permanent magnet rotor and a stator, wherein: a plurality of permanent magnets are disposed in a rotor iron core of the permanent magnet rotor along a periphery of the rotor iron core, polarities thereof being alternately changed; a cooling air
A permanent magnet electrical rotating machine having a permanent magnet rotor and a stator, wherein: a plurality of permanent magnets are disposed in a rotor iron core of the permanent magnet rotor along a periphery of the rotor iron core, polarities thereof being alternately changed; a cooling airflow channel is formed between each pair of adjacent opposite poles on the rotor iron core; and the cooling airflow channel has an approximately trapezoidal shape on an outer periphery side of the rotor iron core; and extends from an end on a central side in a radial direction of the approximately trapezoidal shape to a radial center.
대표청구항
▼
What is claimed is: 1. A permanent magnet electrical rotating machine comprising: a stator; a rotor disposed to face an inner periphery of the stator with a certain gap, wherein the rotor comprises a rotor iron core; a plurality of permanent magnet sets disposed in magnet slots of the rotor iron co
What is claimed is: 1. A permanent magnet electrical rotating machine comprising: a stator; a rotor disposed to face an inner periphery of the stator with a certain gap, wherein the rotor comprises a rotor iron core; a plurality of permanent magnet sets disposed in magnet slots of the rotor iron core and arranged along an outer periphery of the rotor iron core to face the inner periphery of the stator with each magnet set provided for each pole so that polarities of the permanent magnet sets change alternately; and a cooling airflow channel formed between adjacent poles on the rotor iron core to circulate airflow and cool the rotor during rotation, wherein the cooling airflow channel extends to an axial direction of the rotor iron core, and extends from the outer periphery of the rotor iron core, in a radial direction, to a radial center of the rotor iron core; wherein the cooling airflow channel is provided with a mouth portion in an approximately trapezoidal shape at the outer periphery of the rotor iron core, and a stem portion extended from the mouth portion, in the radial direction, to the radial center of the rotor iron core; and wherein a width of the mouth portion expands from the stem portion, in the radial direction to the end of the outer periphery of the rotor iron core. 2. The permanent magnet electrical rotating machine according to claim 1, wherein for a width in a peripheral direction on an inner diameter side of the cooling airflow channel, an angle θ formed by ends, on the inner diameter side, of a width of one pole of the rotor iron core is between 50° and 58°. 3. The permanent magnet electrical rotating machine according to claim 1, wherein, when a depth of the cooling airflow channel in the radial direction extending from the outer periphery of the rotor iron core toward the radial center of the rotor iron core is “a” and a radius of the rotor iron core is “r”, an optimum ratio (a/r) indicating the depth of the cooling airflow channel relative to the radius of the rotor iron core is between 33% and 58%. 4. The permanent magnet electrical rotating machine according to claim 1, wherein an airflow cooling axial duct is provided inside the permanent magnets in the rotor iron core, extending toward to the axial direction to circulate cooling airflow therein. 5. The permanent magnet electrical rotating machine according to claim 1, wherein an intermediate spacer for airflow cooling of the rotor is provided at an axial center of the rotor iron core or at a position shifted toward an air cooler exhaust side, and a duct piece is disposed in the intermediate spacer to form a duct space for flowing cooling air. 6. The permanent magnet electrical rotating machine according to claim 4, wherein an intermediate spacer for airflow cooling of the rotor is provided at an axial center of the permanent magnet rotor or at a position shifted toward an air cooler exhaust side, and a duct piece is disposed in the intermediate spacer to form a duct spacer for flowing cooling air. 7. The permanent magnet electrical rotating machine according to claim 1, wherein a magnetizing coil is disposed in the cooling airflow channel. 8. The permanent magnet electrical rotating machine according to claim 1, wherein the rotor iron core has at least two flat-plate permanent magnets for each pole in such a way that the flat-plate permanent magnets are disposed in a reverse V shape and identical poles face the outer periphery of the rotor iron core in a radial direction, as viewed from an outer periphery of the iron core rotor. 9. The permanent magnet electrical rotating machine according to claim 1, wherein the iron core rotor has at least two flat-plate permanent magnets for each pole in such a way that the flat-plate permanent magnets are disposed in a V shape and identical poles face the outer periphery of the rotor iron core in a radial direction, as viewed from the outer periphery of the iron core rotor. 10. The permanent magnet electrical rotating machine according to claim 1, wherein the iron core rotor has at least two flat-plate permanent magnets for each pole in such a way that the flat-plate permanent magnets are disposed in parallel and identical poles face the outer periphery of the rotor iron core in a radial direction, as viewed from the outer periphery of the iron core rotor. 11. The permanent magnet electrical rotating machine according to claim 1, wherein the iron core rotor has at least two flat-plate permanent magnets for each pole in such a way that the flat-plate permanent magnets are disposed along a periphery of the iron core rotor and identical poles face the outer periphery of the rotor ion core in a radial direction, as viewed from the outer periphery of the iron core rotor. 12. The permanent magnet electrical rotating machine according to claim 1, wherein, in the iron core rotor, the outer periphery of the rotor iron core is not concentric with the inner periphery of the stator, and the outer periphery of the rotor iron core is symmetrical with respect to the center of the periphery for one pole, so that a waveform of an induced voltage can be converted into a sine wave. 13. The permanent magnet electrical rotating machine according to claim 1, wherein, in the iron core rotor, the outer periphery of the rotor iron core of the rotor is not concentric with the inner periphery of the stator, and a radius of the outer periphery starting from a center of the periphery for one pole in a rotational direction is smaller than a radius of another outer periphery starting from the center in a direction opposite to the rotational direction, so that a reaction of an armature can be reduced. 14. The permanent magnet electrical rotating machine according to claim 1, wherein the rotor iron core and the permanent magnet are divided into packets in an axial direction, so that an output of the electrical rotating machine can be adjusted by adjusting the number of packets. 15. A wind power generating system having a wind mill, an electrical rotating machine, which is accommodated in a nacelle, connected to the wind mill through a speed-up gear, and the electrical rotating machine which is connected to a power system through a power converter, wherein: the electrical rotating machine is provided with a permanent magnet, which is seated in a slot of a rotor disposed to face an inner periphery of a stator with a certain gap, the permanent magnet is disposed in a rotor iron core of the rotor along an outer periphery of the rotor iron core to face the inner periphey of the stator, polarities thereof being alternately changed; a cooling airflow channel is formed between adjacent poles on the rotor iron core, and extends to an axial direction of the rotor iron core and extends from the outer periphery of the rotor iron core, in a radial direction, to a radial center of the rotor iron core; and a cooling air is introduced in the cooling airflow channel by a fan connected to a shaft of the rotor, so that the cooling airflow channel receives and circulates the cooling air from the fan to the rotor iron core to cool the rotor during rotation, wherein the electrical rotating machine generates electric power in response to rotation of the wind mill in the wind power generating system. 16. The wind power generating system according to claim 15, wherein the cooling airflow channel has a depth extending from the outer periphery of the rotor iron core toward the radial center of the rotor iron core, passing the permanet magnet seated in the slot of the rotor along the outer periphery of the rotor iron core. 17. The wind power generating system according to claim 16, wherein the cooling airflow channel has a depth relative to a radius of the rotor iron core that is within a range of 33% and 58% of the radius of the rotor iron core. 18. The wind power generating system according to claim 15, wherein the rotor further comprises: an airflow cooling axial duct provided inside the permanent magnet in the rotor iron core, extending toward to the axial direction to circulate cooling airflow therein; an intermediate spacer provided at an axial center of the rotor iron core or at a position shifted toward an air cooler exhaust side; and a duct piece disposed in the intermediate spacer to form a duct space for flowing cooling air. 19. The wind power generating system according to claim 15, wherein, in the iron core rotor, the outer periphery of the rotor iron core is not concentric with the inner periphery of the stator, and the outer periphery of the rotor iron core is symmetrical with respect to a center of the periphery for one pole, so that a waveform of an induced voltage can be converted into a sine wave. 20. The wind power generating system according to claim 15, wherein, in the iron core rotor, the outer periphery of the rotor iron core of the rotor is not concentric with the inner periphery of the stator, and a radius of the outer periphery starting from a center of the periphery for one pole in a rotational direction is smaller than a radius of another outer periphery starting from the center in a direction opposite to the rotational direction, so that a reaction of an armature can be reduced.
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