Motor drive system including abnormality detection unit of power storage device

A motor drive system comprising:

• a power supply unit configured to supply DC power to a DC link;
• a servo amplifier for drive configured to convert DC power in the DC link to AC power and supplies the AC power to a servomotor for drive as a driving power;
• a power storage device configured to store DC power from the DC link and supplies DC power to the DC link;
• an abnormality detection unit configured to detect an abnormality of the power storage device;
• and
• a control unit configured to control an operation of the servo amplifier for drive such that when the abnormality detection unit detects an abnormality of the power storage device, an output of a servomotor for drive is limited to a value smaller than an output before an abnormality detection by the abnormality detection unit, wherein
• a plurality of the servo amplifiers for drive are provided corresponding to a plurality of servomotors for drive;
• a plurality of the power supply units configured to supply DC power to a connected DC link are provided;
• the power storage device is connected with a DC link corresponding to each of the power supply unit;
• and
• the control unit, when the abnormality detection unit detects an abnormality of at least one power storage device among a plurality of the power storage devices, controls an operation of at least one servo amplifier for drive among the plurality of the servo amplifiers for drive connected with a DC link to which a power storage device having the abnormality is connected so that an output of a servomotor for drive corresponding to the servo amplifier for drive to be controlled is limited to a value smaller than an output before an abnormality detection by the abnormality detection unit.