Method and system for reducing bearing fluting in electromechanical machine

An electromechanical machine having an output shaft supported by bearings seated in motor bells, the electromechanical machine being driven by a fast-switching converter including a power-switching semiconductor device, wherein the turn-on/off rate of the semiconductor device is slowed to reduce the fluting of the bearings from the normal turn-on/off rate that is set without considering the minimizing of the fluting.

An electromechanical machine having an output shaft supported by bearings seated in motor bells, the electromechanical machine being driven by a fast-switching converter, wherein the switching frequency of the converter is reduced to minimize the fluting of the bearings from the normal switching frequency that is set without considering the minimizing of the fluting.

An electromechanical machine having an output shaft supported by bearings seated in motor bells, an improvement comprising:

• an insulating ring of non-conductive material shaped to be mounted in the motor bell of the electromechanical machine and to serve as a seat for the output shaft bearing thereby to electrically isolate the output shaft and the bearing from the motor bell;
• and
• the electromechanical machine being driven by a fast-switching converter including a power-switching semiconductor device, and the turn-on/off rate of the semiconductor device is slowed to reduce the fluting of the bearings from the normal turn-on/off rate that is set without considering the minimizing of the fluting.

An electromechanical machine having an output shaft supported by bearings seated in motor bells, an improvement comprising:

• an insulating ring of non-conductive material shaped to be mounted in the motor bell of the electromechanical machine and to serve as a seat for the output shaft bearing thereby to electrically isolate the output shaft and the bearing from the motor bell;
• and
• the electromechanical machine being driven by a fast-switching converter, the switching frequency of the converter being reduced to minimize the fluting of the bearings from the normal switching frequency that is set without considering the minimizing of the fluting.