John R. Suriano

Achievement of higher motor winding slot fill through the use of piezoelectric excitation device

This paper deals with a method to wind motor core slots with greater cross section of installed conductor wires than has been possible with prior turn-by-turn windings. Rapid turn-by-turn winding subjects conductor wires to varying tension which leads to successive slot wires not entering their slots parallel to previously wound wires. Successive turns do not move to the lowest zone of the slot due to friction coupling between themselves and previously wound wires. By inducing vibration in the wire as it is placed in the slot the wire is more apt to migrate to the lowest part of the slot where it can nest in a tighter configuration with the previously wound turns.

Production line evaluation of geared DC motor mechanical efficiency

Mechanical and electrical characteristics of DC motors are important indicators of proper assembly and design integrity. Tests of the individual components of the motor can yield information on these parameters but this is not suitable for end of line testing after the motor is assembled. For geared motors it is desirable to evaluate the mechanical efficiency of the gearing and the amount of frictional loss in the motor as well as the electrical resistance and motor torque constant. This can be done using tests at three load points as described in this paper.