Patent ID: 11916447
Assignee: BLACK & DECKER, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A brushless direct-current (BLDC) motor comprising:
a stator including a stator core, a plurality of teeth, and a plurality of windings;
a rotor shaft disposed within the stator and extending along a longitudinal axis; and
a rotor comprising a rotor core including an inner body mounted on the rotor shaft and a plurality of radial projections projecting outwardly from the inner body, a permanent magnet mounted on an outer end of the plurality of radial projections, and a mold structure formed in contact with the plurality of radial projections and configured to secure the permanent magnet to the rotor core, wherein the permanent magnet comprises a magnet ring having an inner surface sized to come into sliding contact with the plurality of radial projections,
wherein the magnet ring comprises a plurality of projected surfaces and a plurality of recessed surfaces alternatingly arranged and extending along the longitudinal axis, wherein the plurality of recessed surfaces engages the outer end of the plurality of radial projections, and the plurality of projected surfaces cooperate with the mold structure to secure the permanent magnet to the rotor core.