Patent ID: 8436570

Claim:
A motor driving system comprising: a motor for driving a load machine; a driving state amount detector that is mechanically connected to said motor and configured to detect a driving state amount related to said motor; a motor control part configured to perform a power supply control to said motor; a higher control part capable of outputting a higher control command to said motor control part and controlling said power supply control by said motor control part; and a safety requesting part that inputs a safety request signal to said motor control part when predetermined conditions under which said motor should be decelerated or stopped are satisfied; wherein: said motor control part comprises: a motor control circuit part that performs said power supply control in accordance with a predetermined driving control command while referring to said driving state amount as a feedback signal; a mode selecting and executing part configured to select and execute either a first safety function mode in which deceleration control or stop control of said motor is performed by inputting said higher control command that is in accordance with a predetermined higher control operation pattern to said motor control circuit part as said driving control command, or a second safety function mode in which deceleration control or stop control of said motor is performed by inputting an internal deceleration command generated inside said motor control part that is in accordance with a predetermined self-control operation pattern to said motor control circuit part as said driving control command, when said safety request signal is inputted; and a comparing and monitoring processing part that compares said driving state amount and a predetermined operation monitoring pattern and monitors whether or not said driving state amount exceeds said operation monitoring pattern, when said safety request signal is inputted.