Patent ID: 8497649

Claim:
A motor driving control apparatus comprising: a motor driving unit which drives a motor; a driving control unit which supplies to said motor driving unit a command value for said motor driving unit to drive said motor; a power characteristic acquiring unit which acquires voltage and power of said AC power supply, which are power characteristics of an AC power supply that supplies power to said motor; and a control parameter determining unit which determines based on the voltage and power of said AC power supply whether, during driving of said motor, the voltage of said AC power supply drops to a level that adversely affects the driving of said motor, and which, when it is determined that the voltage of said AC power supply drops to the level that adversely affects the driving of said motor, calculates, by using the voltage and power of said AC power supply, a motor output limit value so that the voltage of said AC power supply does not drop below the level that adversely affects the driving of said motor, and supplies a control parameter, which is said motor output limit value, a motor torque limit for limiting the output of said motor, a motor acceleration/deceleration time constant for limiting the output of said motor, or a motor feed speed override for limiting the output of said motor, to said driving control unit in order for said driving control unit to determine said command value.