US 11,705,766 B2
Electric motor having permanent magnet rotor and stator
Mazharul Chowdhury, Midland, MI (US); Md Sariful Islam, Bay City, MI (US); Mohammad Islam, Bay City, MI (US); and Abraham Tesfamicael, Bay City, MI (US)
Assigned to HL MANDO CORPORATION, Gyeonggi-Do (KR)
Filed by HL MANDO CORPORATION, Gyeonggi-do (KR)
Filed on Sep. 17, 2020, as Appl. No. 17/24,652.
Prior Publication US 2022/0085671 A1, Mar. 17, 2022
Int. Cl. H02K 1/27 (2022.01); H02K 1/16 (2006.01); H02K 1/276 (2022.01)
CPC H02K 1/276 (2013.01) [H02K 1/165 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A permanent magnet motor comprising:
a stator assembly comprising teeth associated with arrangement of conductors; and
a rotor assembly configured to be rotatable relative to the stator assembly, the rotor assembly having a plurality of poles,
wherein each pole of the rotor assembly comprises:
a pair of magnet retention slots, each magnet retention slot accommodating a magnet, wherein the each magnet retention slot has a plurality of angled or curved slot surfaces forming a first barrier around a corner of the magnet positioned closest to an outer surface of the rotor assembly;
at least three second barriers positioned around a mid-axis extending along between the pair of the magnet retention slots; and
the first barrier has a first angled or curved slot surface slanted toward the at least three second barriers from a first side surface of the magnet facing the at least three second barriers to form a first part of the first barrier between the magnet and the at least three second barriers,
wherein the at least three second barriers positioned around the mid-axis extending along between the pair of the magnet retention slots comprise:
outer barriers; and
a middle barrier positioned between the outer barriers,
wherein one of the outer barriers is positioned above the middle barrier and another of the outer barriers is positioned below the middle barrier with respect to a radial direction.