Magnetic Shield for Stator Core End Structures of Electric Rotating Machine
First Claim
1. An electric rotating machine comprising a rotor formed with field winding wound around a rotor core, a stator placed opposite to the rotor at a predetermined space and formed with stator winding wound around a stator core formed by stacking a plurality of magnetic steel sheets in an axial direction, clamping plates clamping and retaining the stator core from both axial end parts thereof in a stacking direction of magnetic steel sheets, and a magnetic shield placed around the clamping plates to shield flux leakage flowing into the clamping plates,wherein said magnetic shield is formed of a cylinder of stacked steel sheets stacked in a form of a cylinder about a rotor shaft and powder magnetic core segments having portions which are stuck to said cylinder of stacked steel sheets on a stacking cross section, and arranged to cover side surfaces and inner surface of radial direction of the clamping plates.
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Accused Products
Abstract
In an electric rotating machine, for reducing losses that occur in clamping plates and their shield, the electric rotating machine includes a rotor formed with field winding wound around a rotor core, a stator placed opposite to the rotor at a predetermined space and formed with stator winding wound around a stator core formed by stacking multiple magnetic steel sheets in the axial direction, clamping plates clamping and retaining the stator core from both axial end parts thereof in the stacking direction of the magnetic steel sheets, and a magnetic shield placed around the clamping plates to shield flux leakage flowing into the clamping plates, and the magnetic shield is formed of a cylinder of stacked steel sheets stacked in a form of a cylinder about the rotor shaft and powder magnetic core segments and powder magnetic core segments having portions which are stuck to the cylinder of stacked steel sheets on the stacking cross section, and arranged to cover side surfaces and an inner surface of radial direction of the clamping plates.
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Citations
17 Claims
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1. An electric rotating machine comprising a rotor formed with field winding wound around a rotor core, a stator placed opposite to the rotor at a predetermined space and formed with stator winding wound around a stator core formed by stacking a plurality of magnetic steel sheets in an axial direction, clamping plates clamping and retaining the stator core from both axial end parts thereof in a stacking direction of magnetic steel sheets, and a magnetic shield placed around the clamping plates to shield flux leakage flowing into the clamping plates,
wherein said magnetic shield is formed of a cylinder of stacked steel sheets stacked in a form of a cylinder about a rotor shaft and powder magnetic core segments having portions which are stuck to said cylinder of stacked steel sheets on a stacking cross section, and arranged to cover side surfaces and inner surface of radial direction of the clamping plates.
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17. An electric rotating machine comprising a rotor formed with field winding wound around a rotor core, a stator placed opposite to said rotor at a predetermined space and formed with stator winding wound around a stator core formed by stacking a plurality of magnetic steel sheets in an axial direction, clamping plates clamping and retaining said stator core from both axial end parts thereof in a stacking direction of the magnetic steel sheets, and a magnetic shield placed around said clamping plates to shield flux leakage flowing into said clamping plates,
wherein said magnetic shield is formed of a first member and a second member of a magnetic material, the first member is higher in magnetic permeability than said clamping plates and low in conductivity and has isotropically magnetic properties, the second member is higher in magnetic permeability than the first member and anisotropic in conductivity, and the second member assumes a form of a cylinder and has a joint surface to the first member in a direction in which the conductivity is high, the first member is placed on an axial end side and an inner side of radial direction of the second member.
Specification