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US 8,946,966 B2Granted
Electric rotating machine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsTsukasa Shimizu, Haruyoshi Hino
Life of this patent
Estimating the term…
Abstract
An electric rotating machine is provided. A tooth portion of a stator is divided into a first tooth portion and a second tooth portion that are movable relative to each other between a first position, in which a magnetic resistance between the first and second tooth portions is small, and a second position, in which the magnetic resistance is relatively large. In a state in which the second tooth portion is in the second position, a region from a stator yoke portion side end of a current-carrying winding disposed around the tooth portion to a rotor side end of a winding arrangeable region is divided into a first region and a second region. A current-carrying winding space factor in the first region is set to be relatively smaller than in the second region.
Claims20
An electric rotating machine, comprising:
- a rotor having a permanent magnet and configured to rotate about a rotation axis;
- and
- a stator arranged so as to face the rotor via a gap, the stator including
- a tooth portion arranged so as to face the rotor via the gap,
- a stator yoke portion forming a stator magnetic path together with the tooth portion,
- a current-carrying winding arranged so as to occupy a winding arrangeable region surrounded by the stator yoke portion and the tooth portion, and
- a magnetic resistance changing mechanism configured to change a magnetic resistance of the stator magnetic path by mechanically changing said stator magnetic path, and being configured to mechanically change the stator magnetic path between a first state and a second state,
- wherein in the second state the magnetic resistance of the stator magnetic path is larger than that in the first state, and an electric current passes through the current-carrying winding in both the first and second states,
- wherein the winding arrangeable region has a predetermined region ranging from a first end of the predetermined region to a second end of the predetermined region, the first end being at a stator yoke portion side end of the current-carrying winding, the stator yoke portion side end of the current-carrying winding being disposed closer to the stator yoke portion than any other portion of the current-carrying winding, the second end being at a rotor side end of the winding arrangeable region,
- wherein the predetermined region is divided at an intermediate position of the tooth portion into a first region arranged on a rotor side and a second region arranged on a stator yoke portion side that is disposed closer to the stator yoke portion than the first region, and
- wherein a first current-carrying winding space factor is defined by a ratio of a total winding cross-sectional area of the current-carrying winding in the first region relative to a cross-sectional area of the first region,
- wherein a second current-carrying winding space factor is defined by a ratio of a total winding cross-sectional area of the current-carrying winding in the second region to a cross-sectional area of the second region, and
- wherein the first current-carrying winding space factor is less than the second current-carrying winding space factor.
10 more elements
An electric rotating machine comprising:
- a rotor having a permanent magnet and configured to rotate about a rotation axis;
- and
- a stator arranged so as to face the rotor via a gap, the stator including
- a tooth part arranged so as to face the rotor via the gap, wherein the tooth part is divided into a plurality of divided tooth portions at a position disposed in a direction from a rotor side end of the tooth part, that is disposed closer to the rotor than any other portion of the tooth part, towards an opposite side end portion thereof that is opposite to the rotor side end, the plurality of divided tooth portions including a first tooth portion arranged so as to face the rotor via the gap and a second tooth portion being arranged on the opposite side end portion of the tooth part relative to the first tooth portion,
- a stator yoke portion fixed to the second tooth portion, and
- a current-carrying winding occupying a winding arrangeable region surrounded by the tooth part and the stator yoke portion,
- wherein one of the first tooth portion and the second tooth portion is a movable divided tooth portion relatively movable with respect to the other of the first tooth portion and the second tooth portion, and
- wherein the movable divided tooth portion is movable between a first position and a second position in which a magnetic resistance of a magnetic path formed by the divided tooth portions is relatively larger than that of the first position, and an electric current passes through the current-carrying winding in both the first and second positions,
- wherein the winding arrangeable region has a predetermined region ranging from a first end of the predetermined region to a second end of the predetermined region, the first end being at a stator yoke portion side end of the current-carrying winding, the stator yoke portion side end of the current-carrying winding being disposed closer to the stator yoke portion than any other portion of the current-carrying winding, the second end being at a rotor side end of the winding arrangeable region,
- wherein the predetermined region is divided at an intermediate position of the tooth part in a radial direction of the rotor into a first region arranged on a rotor side and a second region arranged on a stator yoke portion side that is disposed closer to the stator yoke portion than the first region, and
- wherein a first current-carrying winding space factor is defined by a ratio of a total winding cross-sectional area of the current-carrying winding in the first region to a cross-sectional area of the first region,
- wherein a second current-carrying winding space factor is defined by a ratio of a total winding cross-sectional area of the current-carrying winding in the second region to a cross-sectional area of the second region, and
- wherein the first current-carrying winding space factor is less than the second current-carrying winding space factor.
10 more elements
An electric rotating machine comprising:
- a rotor having a permanent magnet and configured to rotate about a rotation axis;
- and
- a stator arranged so as to face the rotor via a gap, the stator including
- a tooth part arranged so as to face the rotor via the gap, wherein the tooth part is divided into a plurality of divided tooth portions at a position disposed in a direction from a rotor side end of the tooth part, that is disposed closer to the rotor than any other portion of the tooth part, towards an opposite side end portion thereof that is opposite to the rotor side end, the plurality of divided tooth portions including a first tooth portion arranged so as to face the rotor via the gap and a second tooth portion being arranged on the opposite side end portion of the tooth part relative to the first tooth portion,
- a stator yoke portion fixed to the second tooth portion, and
- a current-carrying winding occupying a winding arrangeable region surrounded by the tooth part and the stator yoke portion,
- wherein one of the first tooth portion and the second tooth portion is a movable divided tooth portion relatively movable with respect to the other of the first tooth portion and the second tooth portion, and
- wherein the movable divided tooth portion is movable between a first position and a second position in which a magnetic resistance of a magnetic path formed by the divided tooth portions is relatively larger than that of the first position, and an electric current passes through the current-carrying winding in both the first and second positions,
- wherein the winding arrangeable region has a predetermined region ranging from a first end of the predetermined region to a second end of the predetermined region, the first end being at a stator yoke portion side end of the current-carrying winding, the stator yoke portion side end portion of the current-carrying winding, the second end being at a rotor side end of the winding arrangeable region,
- wherein the predetermined region is divided at an intermediate position of the tooth part in an axial direction of the rotor into a first region arranged on a rotor side and a second region arranged on a stator yoke portion side that is disposed closer to the stator yoke portion than the first region, and
- wherein a first current-carrying winding space factor is defined by a ratio of a total winding cross-sectional area of the current-carrying winding in the first region to a cross-sectional area of the first region,
- wherein a second current-carrying winding space factor is defined by a ratio of a total winding cross-sectional area of the current-carrying winding in the second region to a cross-sectional area of the second region,
- wherein the first current-carrying winding space factor is less than the second current-carrying winding space factor,
- wherein the rotor includes a circular plate shaped rotor main body rotatable about the rotation axis, and the permanent magnet is arranged on one surface of the rotor main body, and
- wherein the stator is arranged so as to face the rotor main body in an axial direction of the rotor main body.
12 more elements
Dependencies are inferred from the claim text.