Abstract: A concentricity control apparatus induction for controlling a concentricity between a stator body and a rotor body in an induction motor. The concentricity control apparatus for a concentricity controlling induction motor has a sensor for detecting an eccentricity of a rotor body, an operating unit for operating an electrical current in order to correct an eccentricity according to the detection of the sensor, and a driving circuit for controlling the electrical current of the rotor body. A core control unit so constructed as to apply to a core direction of the rotor body an electromagnetic force perpendicular to a central rotating shaft of the rotor body.

Abstract: A pair of semicylindrical magnet segments are secured against the inner surface of a motor shell of a permanent magnet motor by wedging an elastic locking element into each space between the magnets. Each locking element has an enlarged head portion that extends beyond opposite ends of the magnet segments, the lock elements maintaining the magnet segments in position, circumferentially, radially and axially, within the motor shell to form a shell-magnet subassembly. An assembly fixture is used to support and align the elements during their assembly. A motor armature, including a commutator, is inserted within the subassembly, and end caps having bearings and brushes are bolted to respective ends of the motor shell to form a complete motor.

Abstract: Brush holder for a DC motor is disclosed as having at least one brush box for housing a brush biased radially toward an opening through the brush holder. A brush retainer is provided for preventing the brush from entering the opening of the brush holder until the rotor of the DC motor is assembled to the stator, where the brush retainer is releasably attached to an annular wall defining the brush holder opening. The brush holder also includes means for capturing the brush retainer once it is displaced axially during assembly of the rotor to the stator, as well as means for retaining a printed circuit board in position between the brush holder and the stator end cap.