US 11,894,784 B2 · Power conversion device, motor drive system, and disconnection detection method for signal transmission cable

Abstract

A power conversion device includes: a power conversion circuit that outputs power to a power output terminals to which electric cables of a power cable for supplying AC power to a motor is connected; an encoder circuit that outputs encoder information on the basis of angle information input to an information input terminal and supplied from signal lines of a signal transmission cable; a control unit that outputs a control signal that controls the power conversion circuit on the basis of the encoder information supplied from the encoder circuit; a shield terminal connected to a shield of the signal transmission cable which is electrically connected to a ground line of a power cable on the motor side; and a determination unit that detects a current input to the shield terminal and flowing through the shield of the signal transmission cable, and outputs disconnection detection information for disconnection in the shield.

Claims13

Dependent claims

A power conversion device comprising:

a power conversion circuit to convert power input to a power input terminal into AC power to be supplied to a motor, and to output the converted AC power to be supplied to the motor, to a power output terminal to which an electric cable of a power cable used for supplying AC power to the motor is connected;
a ground terminal to which a ground line of the power cable is connected;
an encoder circuit to output encoder information, on a basis of angle information input to an information input terminal and supplied from a signal line of a 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;
a shield terminal to which a shield of the signal transmission cable is connected, the shield being electrically connected to the ground line of the power cable on a side of the motor;
and
determination circuitry to detect a current input to the shield terminal and flowing through the shield of the signal transmission cable, and to output disconnection detection information for disconnection in the shield of the signal transmission cable.

4 more elements

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.

6 more elements

Dependencies are inferred from the claim text.

Power conversion device, motor drive system, and disconnection detection method for signal transmission cable

Life of this patent

Power conversion device, motor drive system, and disconnection detection method for signal transmission cable

Life of this patent

Abstract

Claims13