High-speed machine tool spindle - direct current motor with permanent magnets on spindle and no commutator

摘要

The spindle is partic. for use in high speed grinders, having one ball or roller bearing fixed and the other sliding intthe axial direction, while the motor is situated between the bearings or overhung at one end. The motor is of the direct current type without commutator, having permanent magnets on the spindle and a stator winding enclosed in a grooveless stator earth component. The stator winding is bell-shaped, and can be embedded in plastics if desired.