US 12,068,639 B2
Motor rotor with sleeve for retention of magnet ring
Changxing Lu, Suzhou (CN); Abraham Sanchez, Lutherville-Timonium, MD (US); Tong Zheng, Suzhou (CN); Fulong Liu, Suzhou (CN); Yeli Gu, Suzhou (CN); David J. Smith, Columbia, MD (US); and Shailesh P. Waikar, Perry Hall, MD (US)
Assigned to Black & Decker Inc., New Britain, CT (US)
Filed by Black & Decker Inc., New Britain, CT (US)
Filed on Jun. 3, 2022, as Appl. No. 17/832,315.
Claims priority of provisional application 63/197,680, filed on Jun. 7, 2021.
Prior Publication US 2022/0393534 A1, Dec. 8, 2022
Int. Cl. H02K 1/30 (2006.01); H02K 1/2733 (2022.01); H02K 7/14 (2006.01); H02K 15/03 (2006.01); H02K 29/00 (2006.01)
CPC H02K 1/30 (2013.01) [H02K 1/2733 (2013.01); H02K 7/145 (2013.01); H02K 15/03 (2013.01); H02K 29/00 (2013.01)] 8 Claims
OG exemplary drawing
 
1. 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 having a radial wall including a center opening that receives the rotor shaft therein and a cylindrical body extending from the radial wall and forming an annular recess therein around the rotor shaft adjacent the radial wall, wherein a bearing mounted on the rotor shaft is nested within the annular recess of the rotor core,
wherein the rotor further comprises a permanent magnet ring mounted on an outer surface of the cylindrical body with no intermediate adhesive therebetween, and a metal sleeve securely fitted outside the permanent magnet ring, the metal sleeve including a flange extending radially inwardly that covers an axial end of the permanent magnet ring and is bonded to an end surface of the cylindrical body of the rotor core opposite the radial wall to secure the permanent magnet ring to the rotor core such that a rotational torque of the rotor is transmitted to the permanent magnet ring substantially through the metal sleeve, wherein the flange has a radial width that is greater than or equal to a thickness of the permanent magnet ring but does not reach the annular recess.