INVERTER-DRIVEN DYNAMO ELECTRIC MACHINE AND SYSTEM, BEARING, AND END BRACKET FOR SAME

摘要

The purpose of the invention is to provide an inverter-driven dynamo electric machine and a system for the same having high reliability and high efficiency such that even in the case of inverter pulse voltages having high dv/dt, generation of shaft voltages and generation of bearing currents causing electrical corrosion of a bearing with the generation of the shaft voltages are suppressed, thereby keeping the bearing free of electrical corrosion. The purpose of the invention is achieved by the following method. That is, the purpose is achieved by an inverter-driven dynamo electric machine and system for the same comprising at least one machine support bearing which supports a shaft of a rotor, and one electric discharge bearing which discharges the voltage generated at the shaft of the rotor, wherein the electric discharge bearing uses a bearing having a lower dielectric breakdown voltage between the inner race and outer race than that of the machine support bearing. Accordingly, this can provide an inverter-driven dynamo electric machine and a system for the same having high reliability and high efficiency such that the bearing is not electrically corroded with respect to the inverter pulse voltage.