IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0861412
(2010-08-23)
|
등록번호 |
US-8299674
(2012-10-30)
|
우선권정보 |
JP-2009-191945 (2009-08-21) |
발명자
/ 주소 |
- Tanaka, Asuka
- Taniguchi, Makoto
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
6 |
초록
▼
In an electric rotating machine, a stator coil is comprised of first and second winding groups. The stator coil is wound around a stator core in a concentrated winding manner so that the phase difference in electrical angle between each corresponding pair of windings of the first and second winding
In an electric rotating machine, a stator coil is comprised of first and second winding groups. The stator coil is wound around a stator core in a concentrated winding manner so that the phase difference in electrical angle between each corresponding pair of windings of the first and second winding groups is equal to π/6. Further, the windings of the first and second winding groups are connected to form Δ-Y connections. Consequently, the sixth harmonic components of the electromagnetic forces created by the windings of the first winding group can be offset by those of the electromagnetic forces created the windings of the second winding group. As a result, the total magnetic noise and torque ripple generated in the machine can be reduced. Moreover, the machine can be driven with only a single three-phase inverter to achieve the effects of reducing the total magnetic noise and torque ripple.
대표청구항
▼
1. An electric rotating machine comprising: a stator including a hollow cylindrical stator core and a stator coil, the stator core having a plurality of stator core teeth that are formed at a predetermined pitch in a circumferential direction of the stator core, the stator coil having three terminal
1. An electric rotating machine comprising: a stator including a hollow cylindrical stator core and a stator coil, the stator core having a plurality of stator core teeth that are formed at a predetermined pitch in a circumferential direction of the stator core, the stator coil having three terminals via which three-phase AC current is input to or output from the stator coil; anda rotor disposed radially inside of the stator core, the rotor having a plurality of magnetic poles the polarities of which alternate between north and south in the circumferential direction of the stator core,whereinthe number of the stator core teeth is equal to 12×n, and the number of the magnetic poles of the rotor is equal to 10×n or 14×n, where n is a natural number,the stator coil is comprised of first and second winding groups, the first winding group including 2×n X-phase windings, 2×n Y-phase windings, and 2×n Z-phase windings, the second winding group including 2×n U-phase windings, 2×n V-phase windings, and 2×n W-phase windings,the stator coil is wound around the stator core in a concentrated winding manner so that each of the windings of the first and second winding groups is wound around a corresponding one of the stator core teeth,the windings of the first and second winding groups are connected to form 2×n Δ-Y connections that are arranged one after another in the circumferential direction of the stator core,each of the Δ-Y connections is formed of six different-phase windings including one X-phase winding, one Y-phase winding, and one Z-phase winding of the first winding group and one U-phase winding, one V-phase winding, and one W-phase winding of the second winding group, the six different-phase windings being adjacent to one another and arranged in a phase sequence of U, X, V, Y, W, and Z in the circumferential direction of the stator core,for each of the Δ-Y connections, the U-phase and X-phase windings are wound in opposite directions, the V-phase and Y-phase windings are wound in opposite directions, and the W-phase and Z-phase windings are wound in opposite directions, andeach of the Δ-Y connections is a combination of a Δ connection and a Y connection, the Δ connection being formed by Δ-connecting the three different-phase windings of one of the first and second winding groups, the Y connection being formed by Y-connecting the three different-phase windings of the other winding group, the Δ and Y connections being combined by connecting opposite ends of each of the Y-connected windings respectively to a corresponding one of nodes between the Δ-connected windings and a corresponding one of the three terminals of the stator coil. 2. The electric rotating machine as set forth in claim 1, wherein each of the Δ-connected windings is wound around the corresponding stator core tooth by a first predetermined number of turns, each of the Y-connected windings is wound around the corresponding stator core tooth by a second predetermined number of turns, andthe first predetermined number is set to be 1.6 to 1.9 times the second predetermined number. 3. The electric rotating machine as set forth in claim 1, wherein the magnetic poles of the rotor are skewed with respect to a longitudinal axis of the rotor by a predetermined angle. 4. The electric rotating machine as set forth in claim 1, wherein the electric rotating machine is used in a mechanical power generation system to function as an electric motor, and the mechanical power generation system comprises only a single three-phase inverter to supply three-phase AC current to the stator coil of the electric rotating machine via the three terminals of the stator coil. 5. The electric rotating machine as set forth in claim 1, wherein the electric rotating machine is used in an electric power generation system to function as an electric generator, and the electric power generation system comprises only a single three-phase rectifier to rectify three-phase AC current, which is output from the stator coil of the electric rotating machine via the three terminals of the stator coil, into DC current. 6. An electric rotating machine comprising: a stator including a hollow cylindrical stator core and a stator coil, the stator core having a plurality of stator core teeth that are formed at a predetermined pitch in a circumferential direction of the stator core, the stator coil having three terminals via which three-phase AC current is input to or output from the stator coil; anda rotor disposed radially inside of the stator core, the rotor having a plurality of magnetic poles the polarities of which alternate between north and south in the circumferential direction of the stator core,whereinthe number of the stator core teeth is equal to 12×n, and the number of the magnetic poles of the rotor is equal to 10×n or 14×n, where n is a natural number,the stator coil is comprised of first and second winding groups, the first winding group including 2×n X-phase windings, 2×n Y-phase windings, and 2×n Z-phase windings, the second winding group including 2×n U-phase windings, 2×n V-phase windings, and 2×n W-phase windings,the stator coil is wound around the stator core in a concentrated winding manner so that each of the windings of the first and second winding groups is wound around a corresponding one of the stator core teeth,the windings of the first and second winding groups are connected to form 2×n Δ-Y connections that are arranged one after another in the circumferential direction of the stator core,each of the Δ-Y connections is formed of six different-phase windings including one X-phase winding, one Y-phase winding, and one Z-phase winding of the first winding group and one U-phase winding, one V-phase winding, and one W-phase winding of the second winding group, the six different-phase windings being adjacent to one another and arranged in a phase sequence of U, X, V, Y, W, and Z in the circumferential direction of the stator core,for each of the Δ-Y connections, the U-phase and X-phase windings are wound in opposite directions, the V-phase and Y-phase windings are wound in opposite directions, and the W-phase and Z-phase windings are wound in opposite directions, andeach of the Δ-Y connections is a combination of a Δ connection and a Y connection, the Δ connection being formed by Δ-connecting the three different-phase windings of one of the first and second winding groups, nodes between the Δ-connected windings being respectively connected to the three terminals of the stator coil, the Y connection being formed by Y-connecting the three different-phase windings of the other winding group to define a neutral point therebetween, the Δ and Y connections being combined by connecting ends of the Y-connected windings opposite to the neutral point respectively to the nodes between the Δ-connected windings. 7. The electric rotating machine as set forth in claim 6, wherein each of the Δ-connected windings is wound around the corresponding stator core tooth by a first predetermined number of turns, each of the Y-connected windings is wound around the corresponding stator core tooth by a second predetermined number of turns, andthe first predetermined number is set to be 1.6 to 1.9 times the second predetermined number. 8. The electric rotating machine as set forth in claim 6, wherein the magnetic poles of the rotor are skewed with respect to a longitudinal axis of the rotor by a predetermined angle. 9. The electric rotating machine as set forth in claim 6, wherein the electric rotating machine is used in a mechanical power generation system to function as an electric motor, and the mechanical power generation system comprises only a single three-phase inverter to supply three-phase AC current to the stator coil of the electric rotating machine via the three terminals of the stator coil. 10. The electric rotating machine as set forth in claim 6, wherein the electric rotating machine is used in an electric power generation system to function as an electric generator, and the electric power generation system comprises only a single three-phase rectifier to rectify three-phase AC current, which is output from the stator coil of the electric rotating machine via the three terminals of the stator coil, into DC current.
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