Method of balancing an embedded permanent magnet motor rotor
AssigneeCanopy Technologies, LLC
InventorAndrew P. Watson
Life of this patent
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Abstract
A method of balancing an embedded permanent magnet motor rotor includes the steps of: a) providing a non-magnetic cylindrical shaft having an axis of rotation and a generally cylindrical surface with an even number of recessed slots defining an even number of ribs therebetween; b) machining an axial slot having a cross-section with a top opening, a bottom and two sides in a center portion of each of the recessed slots; c) sliding at least one balance weight into at least one of the axial slots; and d) inserting locating rods into the axial slot on each side of the at least one balance weight.
Claims20
A method of balancing an embedded permanent magnet motor rotor, comprising the steps of:
- a) providing a non-magnetic cylindrical shaft having an axis of rotation and a generally cylindrical surface with an even number of recessed slots defining an even number of ribs therebetween;
- b) machining an axial slot having a cross-section with a top opening, a bottom and two sides in a center portion of each of the recessed slots;
- c) sliding at least one balance weight into at least one of the axial slots;
- and
- d) inserting locating rods into the axial slot on each side of the at least one balance weight.
A permanent magnet rotor assembly comprising:
- a non-magnetic cylindrical shaft having an axis of rotation and a generally cylindrical surface with an even number of recessed slots defining an even number of ribs therebetween, each of the recessed slots having an axial slot positioned in a center portion thereof and extending along a length thereof;
- a plurality of stages of lamination stacks and magnets surrounding the shaft to form an assembly, each stage comprising:
- a plurality of lamination stacks surrounding the ribs, and
- a plurality of permanent magnets circumferentially positioned between the lamination stacks;
- at least one balance weight positioned within each of the axial slots;
- locating rods positioned in the axial slot on each side of the at least one balance weight;
- and
- disc-shaped retainer plates with holes machined therein corresponding to each of the axial slots at each axial end of the rotor.
A method of balancing an embedded permanent magnet motor rotor, comprising the steps of:
- a) providing a non-magnetic cylindrical shaft having an axis of rotation and a generally cylindrical surface with an even number of recessed slots defining an even number of ribs therebetween;
- b) machining an axial slot having a cross-section with a top opening, a bottom and two sides in a center portion of each of the recessed slots;
- c) positioning a plurality of stages of lamination stacks and magnets around the shaft, each of the plurality of stages comprising:
- a plurality of lamination stacks surrounding the ribs, and a plurality of permanent magnets circumferentially positioned between the lamination stacks;
- d) positioning two retainer plates with holes machined therein corresponding to a position of each of the axial slots at a first end and a second end of the shaft, respectively, to secure the plurality of stages therebetween;
- e) sliding at least one balance weight into at least one of the holes of one of the retainer plates and then into one of the axial slots;
- and
- f) inserting locating rods into the axial slot on each side of the at least one balance weight.
Dependencies are inferred from the claim text.