Patent ID: 11894784
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A motor drive system comprising:
a power cable including an electric cable to transmit AC power to be supplied to a motor and a ground line;
a signal transmission cable including a signal line to transmit angle information of a rotation shaft of the motor and a shield electrically connected to the ground line of the power cable on a side of the motor; and
a power conversion device including: a power conversion circuit to convert power supplied from a power source into the AC power to be supplied to the motor and to supply the AC power to be supplied to the motor to the electric cable of the power cable; a ground terminal to which the ground line of the power cable is connected; an encoder circuit to output encoder information on a basis of the angle information supplied from the signal line of the signal transmission cable; a control circuit to output a control signal that controls the power conversion circuit on a basis of the encoder information supplied from the encoder circuit; and determination circuitry to detect a current flowing through the shield of the signal transmission cable and to output disconnection detection information for disconnection of the shield of the signal transmission cable.