Brushless permanent magnet wheel motor with variable axial rotor/stator alignment
First Claim
1. A brushless permanent magnet electrical machine which comprises:
- a first cylindrical member having a central axis, an inner cylindrical surface and an outer cylindrical surface and a plurality of magnetic poles extending outward from the outer cylindrical surface of the first cylindrical member, the plurality of magnetic poles provided with wire coils around each of the plurality of magnetic poles;
a second cylindrical member having a central axis, an inner cylindrical surface and an outer cylindrical surface and a plurality of permanent magnets coupled to the inner cylindrical surface of the second cylindrical member, the second cylindrical member surrounding the first cylindrical member so that the plurality of magnet poles and the plurality of permanent magnets are adjacent and spaced apart from one another radially and the central axis of the second cylindrical member and the central axis of the first cylindrical member coincide and define a common central axis;
a rotatable shaft that is coaxial with the common axis; and
means for moving the second cylindrical member with respect to the first cylindrical member along the common central axis.
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Accused Products
Abstract
A brushless permanent magnet electric machine with a fixed radial air gap is operated to a much higher speed than normal maximum speed by the reduction in effective magnet pole strength. Permanent magnets are supported on the inner surface of an axially movable cylindrical shell. A plurality of magnetic poles provided with wire coils are supported on a stationary cylindrical member cooperate with the permanent magnets on the axially movable cylindrical shell to either cause, or react to, rotation of the axially movable cylindrical shell. The axially movable cylindrical shell and cylindrical member are coaxial. The cylindrical shell is axially movable with respect to the cylindrical member.
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Citations
21 Claims
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1. A brushless permanent magnet electrical machine which comprises:
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a first cylindrical member having a central axis, an inner cylindrical surface and an outer cylindrical surface and a plurality of magnetic poles extending outward from the outer cylindrical surface of the first cylindrical member, the plurality of magnetic poles provided with wire coils around each of the plurality of magnetic poles;
a second cylindrical member having a central axis, an inner cylindrical surface and an outer cylindrical surface and a plurality of permanent magnets coupled to the inner cylindrical surface of the second cylindrical member, the second cylindrical member surrounding the first cylindrical member so that the plurality of magnet poles and the plurality of permanent magnets are adjacent and spaced apart from one another radially and the central axis of the second cylindrical member and the central axis of the first cylindrical member coincide and define a common central axis;
a rotatable shaft that is coaxial with the common axis; and
means for moving the second cylindrical member with respect to the first cylindrical member along the common central axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A motor vehicle comprising a plurality of wheels, at least one of said plurality of wheels coupled to a hub motor that comprises:
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a stator having a central axis, an inner cylindrical surface and an outer cylindrical surface and a plurality of magnetic poles extending outward from the outer cylindrical surface of the stator, the plurality of magnetic poles provided with wire coils around each of the plurality of magnetic poles;
a rotator having a central axis, an inner cylindrical surface and an outer cylindrical surface and a plurality of permanent magnets coupled to the inner cylindrical surface of the rotator, the rotator surrounding the stator so that the plurality of magnet poles and the plurality of permanent magnets are adjacent and spaced apart from one another radially and the central axis of the rotor and the central axis of the stator coincide and define a common central axis;
a rotatable shaft that is coaxial with the common axis; and
means for moving the rotor with respect to the stator along the common central axis. - View Dependent Claims (20, 21)
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Specification