초록 ▼

A low cogging torque permanent magnet rotor is provided including a shaft and a permanent magnet mounted on the shaft. A gap is provided between the shaft and the magnet near a boundary between the magnet poles thereby reducing the cogging torque as the rotor poles rotate past the poles of the motor

A low cogging torque permanent magnet rotor is provided including a shaft and a permanent magnet mounted on the shaft. A gap is provided between the shaft and the magnet near a boundary between the magnet poles thereby reducing the cogging torque as the rotor poles rotate past the poles of the motor stator.

대표청구항 ▼

[Having thus described the invention, the following is claimed:] [1.]a shaft rotatable about a longitudinal axis having longitudinally spaced front and rear ends and a radially outer surface;a magnet having a radially inner surface engaging said outer surface of said shaft an outer surface radially

[Having thus described the invention, the following is claimed:] [1.]a shaft rotatable about a longitudinal axis having longitudinally spaced front and rear ends and a radially outer surface;a magnet having a radially inner surface engaging said outer surface of said shaft an outer surface radially outwardly of said inner surface, and at least two magnetic poles having different magnetic polarities circumferentially adjacent one another at a pole boundary; andsaid shaft and said magnet near said pole boundary having an air gap therebetween, said air gap including a contoured portion on said shaft.