Patent ID: 7042178
Filing Date: 2006-05-09
Classification: H02M,H02P

Abstract:
1. A motor driving apparatus for driving an AC motor using a regenerative electric power as well as electric power from an AC power source, comprising: a converter section rectifying and converting an alternating current from the AC power source into a direct current; an inverter section, connected to an AC motor, converting the converted direct current into an alternating current to drive the AC motor; a DC link connecting said converter section and said inverter section; a power storage device, connected to said DC link, charging a capacitor with regenerative electric power in a decelerating drive of the AC motor and discharging the electric power stored in the capacitor to be supplied to said DC link in an accelerating drive of the AC motor; and regeneration control means for detecting a voltage of said DC link and feeding the regenerative electric power to the AC power source when the detected voltage of said DC link is equal to or higher than a regeneration control start voltage, said regeneration control means having regeneration control start voltage altering means for altering the regeneration control start voltage to avoid the regeneration control when the electric power stored in the capacitor is supplied to said DC link.