Patent ID: 6762581
Filing Date: 2004-07-13
Classification: H02M,H02P

Abstract:
A control system of an electric motor powered by a battery, comprising:an inverter circuit that inverts a direct current fed from said battery to an alternating current fed to said electric motor; and an output controlling circuit that controls an output of said inverter circuit to adjust operation of said electric motor, said output controlling circuit including: a first section that detects a magnitude of output voltage of said battery; a second section that, based on the detected output voltage, derives an unloaded voltage that would be outputted from said battery when said battery is unloaded; a third section that, based on said unloaded voltage, looks up an appropriate current command from maps that store various current commands with respect to operation condition of the motor; and a fourth section that, based on said current command, controls the output of said inverter circuit.