Direct current (DC) generator for air drilling machine, has main portion that is connected directly to rotor without shaft and is operated based on speed of rotor

摘要

The direct current generator (2) has a main portion that is connected directly to a rotor (4) without the shaft and is operated based on the speed of the rotor. A rechargeable battery (3) is charged up by the power from the generator to compensate the current fluctuations in the power source. The rechargeable battery is used in the charged state, if the power source is not operated.