MOTOR CONTROLLER FOR BATTERY FORKLIFT

摘要

The present invention provides an AC motor controller for a battery forklift operated by driving an AC motor via a three-phase bridge inverter using a battery as an energy source, wherein it is possible to replace only a damaged arm, and the contro l signal of each arm is isolated with a transformerless constitution, by using a diode. The A C motor controller comprises the three-phase bridge inverter containing three arms having semiconductor elements connected in series on their positive side and negati ve side, wherein the three arms, each of which constitutes a mounting unit, form a module, and each of the three arms is independently removable.