Brushless permanent magnet motor/generator with axial rotor decoupling to eliminate magnet induced torque losses
First Claim
1. A permanent magnet motor/generator that comprises:
- a housing;
a stator located in the housing in a fixed position with respect to the housing, the stator having a plurality of stator magnetic poles and windings for generating a rotating filed in the stator magnetic poles, said stator having a central axis;
a rotatable shaft extending through the housing and having a central axis which coincides with the central axis of the stator;
a rotor located in the housing and movably positioned on the rotatable shaft the rotor provided with a plurality of permanent magnets at a peripheral surface thereof and having a central axis which coincides with the central axis of the stator; and
an actuator for moving the rotor axially along the rotatable shaft within the housing so as to move the rotor while the stator is maintained in a fixed position with respect to the housing, the rotor being moved a sufficient distance relative to the stator to completely decouple the rotor from the stator so as to eliminate magnet induced torque drag.
1 Assignment
0 Petitions
Accused Products
Abstract
A permanent magnet motor/generator that includes a stator, a rotor provided with a plurality of permanent magnets at a peripheral surface thereof and having a central axis which coincides with the central axis of the stator, a rotatable shaft upon which the rotor is coupled, and an actuator for moving the rotor with respect to the stator axially along the rotatable shaft a sufficient distance to completely decouple the rotor from the stator so as to eliminate magnet induced torque drag. When the permanent magnet/generator is used in parallel hybrid vehicles, the ability to completely decouple the rotor from the stator greatly improves range and efficiency. In addition, by progressively engaging the rotor with the stator a desired voltage output can be obtained upon deceleration.
86 Citations
20 Claims
-
1. A permanent magnet motor/generator that comprises:
-
a housing; a stator located in the housing in a fixed position with respect to the housing, the stator having a plurality of stator magnetic poles and windings for generating a rotating filed in the stator magnetic poles, said stator having a central axis; a rotatable shaft extending through the housing and having a central axis which coincides with the central axis of the stator; a rotor located in the housing and movably positioned on the rotatable shaft the rotor provided with a plurality of permanent magnets at a peripheral surface thereof and having a central axis which coincides with the central axis of the stator; and an actuator for moving the rotor axially along the rotatable shaft within the housing so as to move the rotor while the stator is maintained in a fixed position with respect to the housing, the rotor being moved a sufficient distance relative to the stator to completely decouple the rotor from the stator so as to eliminate magnet induced torque drag. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method of method of operating a permanent magnet motor/generator so as to eliminate magnet induced torque drag which method comprises:
-
providing permanent magnet motor/generator that includes; i) a housing; ii) a stator located in the housing in a fixed position with respect to the housing, the stator having a plurality of stator magnetic poles and windings for generating a rotating filed in the stator magnetic poles, said stator having a central axis; iii) a rotatable shaft extending through the housing and having a central axis which coincides with the central axis of the stator; and iv) a rotor located in the housing and movably positioned on the rotatable shaft, the rotor provided with a plurality of permanent magnets at a peripheral surface thereof and having a central axis which coincides with the central axis of the stator; and b) moving the rotor axially along the rotatable shaft within the housing so as to move the rotor while the stator is maintained in a fixed position with respect to the housing, the rotor being moved a sufficient distance relative to the stator to completely decouple the rotor from the stator so as to eliminate magnet induced torque drag. - View Dependent Claims (12, 13, 14)
-
-
15. A parallel hybrid vehicle which comprises:
-
an internal combustion engine and a permanent magnetic motor/generator, wherein the permanent magnet motor/generator includes; a housing; a stator located in the housing in a fixed position with respect to the housing, the stator having a plurality of stator magnetic poles and windings for generating a rotating filed in the stator magnetic poles, said stator having a central axis; a rotatable shaft extending through the housing and having a central axis which coincides with the central axis of the stator; a rotor located in the housing and movably positioned on the rotatable shaft, the rotor provided with a plurality of permanent magnets at a peripheral surface thereof and having a central axis which coincides with the central axis of the stator; and an actuator for moving the rotor axially along the rotatable shaft within the housing so as to move the rotor while the stator is maintained in a fixed position with respect to the housing, the rotor being moved a sufficient distance relative to the stator to completely decouple the rotor from the stator so as to eliminate magnet induced torque drag. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification