Abstract: A motor drive according to the present invention includes an inverter, a motor rotational speed obtaining unit, a motor inertia information storage unit, a motor rotational energy calculator, a dynamic braking circuit, a tolerance information storage unit for storing the tolerances of resistors of the dynamic braking circuit, a power element operation unit, a dynamic braking circuit operation unit, and a tolerance comparator for performing a comparison between the rotational energy of a motor and the tolerance of the dynamic braking circuit. When the rotational energy exceeds the tolerance, power elements of one of arms are turned on, while power elements of the other arm are turned off, without actuating the dynamic braking circuit. When the rotational energy is equal to or less than the tolerance, the dynamic braking circuit is actuated, and the power elements of the one of the arms are turned off.

Abstract: A connection member includes: a first short bar whose one end is attached to a first terminal block; a second short bar which extends in a longitudinal direction of the first short bar and whose one end is attached to a second terminal block, at least part of the other end of the second short bar overlapping the first short bar; and a guide member which is attached to an overlapping part of the first short bar and the second short bar and which allows the second short bar to move relative to the first short bar in the longitudinal direction while maintaining surface contact between the first short bar and the second short bar at the overlapping part.

Abstract: A connection member includes: a first short bar whose one end is attached to a first terminal block; a second short bar which extends in a longitudinal direction of the first short bar and whose one end is attached to a second terminal block, at least part of the other end of the second short bar overlapping the first short bar; and a guide member which is attached to an overlapping part of the first short bar and the second short bar and which allows the second short bar to move relative to the first short bar in the longitudinal direction while maintaining surface contact between the first short bar and the second short bar at the overlapping part.

Abstract: In a motor driver of the present invention, voltage and current values measured by a voltage and current detector and a voltage value measured by a voltage detector are determined as first measurement results, in the state of turning on semiconductor switching elements connected between a positive terminal of a capacitor and motor coils. Voltage and current values measured by the voltage and current detector and a voltage value measured by the voltage detector are determined as second measurement results, in the state of, as to a group A, turning on a semiconductor switching element connected between the positive terminal of the capacitor and the motor coil, and as to a group B, turning on semiconductor switching elements connected between a negative terminal of the capacitor and the motor coil. The insulation resistance values are calculated between the motor coils of each group A or B and a ground.

Abstract: A motor drive apparatus according to the present invention comprises: an electric shunt which shunts a current flowing through a power line connected to a motor; a first current detection unit and a second detection unit, each disposed on either side of a node shunted by the electric shunt, for detecting the current flowing through the power line; a shunt commanding unit which gives a shunt command to the electric shunt to effect shunting of the current; and a determining unit which determines the presence or absence of a fault in the electric shunt, based on the shunt command and on current values detected by the first current detection unit and the second detection unit.

Abstract: A motor drive device includes a power source unit rectifying AC voltage to DC voltage and to smooth the DC voltage by a capacitor, a motor drive amplification, a power source voltage measurement unit, an insulation resistance deterioration detection unit having a contact unit connecting one end of the capacitor to the ground and a current detection unit provided between the other end of the capacitor and a motor coil, and detecting a deterioration in an insulation resistance of the motor based on a detected signal obtained from a closed circuit formed by the contact unit, the capacitor, the motor coil, and the ground by using the current detection unit, and a failure detection unit detecting a failure in the insulation resistance deterioration detection unit based on the detected signal in the insulation resistance deterioration detection unit and a voltage value measured by the power source voltage measurement unit.

Abstract: A motor drive device includes: a converter; a power supply; a plurality of inverter units configured to convert DC to AC to drive a plurality of motors by upper arm switching elements connected between a capacitor and motor coils and lower arm switching elements connected between the capacitor and motor coils; a second switch configured to connect the capacitor to the earth; a current detector configured to measure current flowing between the capacitor and the earth; a voltage detector configured to measure the voltage across the capacitor; and, an insulation resistance detector configured to detect insulation resistance of the multiple motors based on the current and voltage measured in a condition that the switching element to which the motor coil to be measured is connected is turned on and the switching elements to which a motor coil other than the target for measurement is connected are turned off.

Abstract: A motor drive according to the present invention includes an inverter, a motor rotational speed obtaining unit, a motor inertia information storage unit, a motor rotational energy calculator, a dynamic braking circuit, a tolerance information storage unit for storing the tolerances of resistors of the dynamic braking circuit, a power element operation unit, a dynamic braking circuit operation unit, and a tolerance comparator for performing a comparison between the rotational energy of a motor and the tolerance of the dynamic braking circuit. When the rotational energy exceeds the tolerance, power elements of one of arms are turned on, while power elements of the other arm are turned off, without actuating the dynamic braking circuit. When the rotational energy is equal to or less than the tolerance, the dynamic braking circuit is actuated, and the power elements of the one of the arms are turned off.

Abstract: A motor drive includes a DC power supply unit for rectifying electric power supplied from an AC power supply using a rectifier and smoothing the electric power using a capacitor; and a plurality of independent voltage measurement circuits for measuring the voltage of the DC power supply unit. The motor drive, which converts a DC voltage into an AC voltage to drive a motor, includes a voltage collection unit for collecting voltage information obtained from the voltage measurement circuits; a normal operation voltage information storage unit for storing a normal operation voltage; and an abnormality determination unit for identifying an intersection voltage of output signals based on voltage values collected by the voltage collection unit, comparing the intersection voltage with the normal operation voltage, and detecting a broken portion owing to entering foreign matter based on the difference between the intersection voltage and the normal operation voltage.

Abstract: A motor drive apparatus according to the present invention comprises: an electric shunt which shunts a current flowing through a power line connected to a motor; a first current detection unit and a second detection unit, each disposed on either side of a node shunted by the electric shunt, for detecting the current flowing through the power line; a shunt commanding unit which gives a shunt command to the electric shunt to effect shunting of the current; and a determining unit which determines the presence or absence of a fault in the electric shunt, based on the shunt command and on current values detected by the first current detection unit and the second detection unit.

Abstract: A motor drive includes a DC power supply unit for rectifying electric power supplied from an AC power supply using a rectifier and smoothing the electric power using a capacitor; and a plurality of independent voltage measurement circuits for measuring the voltage of the DC power supply unit. The motor drive, which converts a DC voltage into an AC voltage to drive a motor, includes a voltage collection unit for collecting voltage information obtained from the voltage measurement circuits; a normal operation voltage information storage unit for storing a normal operation voltage; and an abnormality determination unit for identifying an intersection voltage of output signals based on voltage values collected by the voltage collection unit, comparing the intersection voltage with the normal operation voltage, and detecting a broken portion owing to entering foreign matter based on the difference between the intersection voltage and the normal operation voltage.

Abstract: A motor drive device of the present invention includes: a rectification circuit configured to rectify an AC voltage; a power source unit configured to smooth a DC voltage by a capacitor; an inverter unit configured to drive a motor by converting a DC voltage into an AC voltage; a current detection unit configured to measure a current flowing through a resistor which is connected to a coil of the motor and the capacitor; a voltage detection unit configured to measure a value of a voltage across the capacitor; a second switch that grounds the capacitor; and an insulation resistance detection unit configured to detect an insulation resistance value of a motor by using two sets of a current value and a voltage value measured in two states where the second switch is turned off and turned on.

Abstract: The motor drive device includes: a three-phase inverter having switching elements and converting a direct current into an alternating current; a plurality of current detection circuits configured to detect a current that flows through a power line in each phase; a current abnormality detection unit configured to detect the presence/absence of an abnormality based on the detected currents; a failure diagnosis start unit configured to output a failure diagnosis start signal based on the abnormality detection results; an inverter switching command unit configured to output a command for performing a plurality of switching patterns in which switching of the switching elements is performed selectively so that a current flows between two selected phases; a current analysis unit configured to analyze the detected currents; and a failed part determination unit configured to determine a failed part based on the current analysis results and the switching patterns.

Abstract: A motor drive device includes a power source unit rectifying AC voltage to DC voltage and to smooth the DC voltage by a capacitor, a motor drive amplification, a power source voltage measurement unit, an insulation resistance deterioration detection unit having a contact unit connecting one end of the capacitor to the ground and a current detection unit provided between the other end of the capacitor and a motor coil, and detecting a deterioration in an insulation resistance of the motor based on a detected signal obtained from a closed circuit formed by the contact unit, the capacitor, the motor coil, and the ground by using the current detection unit, and a failure detection unit detecting a failure in the insulation resistance deterioration detection unit based on the detected signal in the insulation resistance deterioration detection unit and a voltage value measured by the power source voltage measurement unit.

Abstract: A motor drive device includes: a converter; a power supply; a plurality of inverter units configured to convert DC to AC to drive a plurality of motors by upper arm switching elements connected between a capacitor and motor coils and lower arm switching elements connected between the capacitor and motor coils; a second switch configured to connect the capacitor to the earth; a current detector configured to measure current flowing between the capacitor and the earth; a voltage detector configured to measure the voltage across the capacitor; and, an insulation resistance detector configured to detect insulation resistance of the multiple motors based on the current and voltage measured in a condition that the switching element to which the motor coil to be measured is connected is turned on and the switching elements to which a motor coil other than the target for measurement is connected are turned off.

Abstract: A motor drive device of the present invention includes: a rectification circuit configured to rectify an AC voltage; a power source unit configured to smooth a DC voltage by a capacitor; an inverter unit configured to drive a motor by converting a DC voltage into an AC voltage; a current detection unit configured to measure a current flowing through a resistor which is connected to a coil of the motor and the capacitor; a voltage detection unit configured to measure a value of a voltage across the capacitor; a second switch that grounds the capacitor; and an insulation resistance detection unit configured to detect an insulation resistance value of a motor by using two sets of a current value and a voltage value measured in two states where the second switch is turned off and turned on.

Abstract: A data reception unit carries out reception of data, which consists of a combination of switching noise resistant states and switching noise nonresistant states, over a fixed serial communication time a plurality of times for each fixed serial communication period same as the one or a plurality of the switching periods. A serial communication time setting unit sets the serial communication time different from one or a plurality of the switching periods, based on the switching period, the serial communication period, and the communication speed of the data communication device, so that the starts of all of the switching periods within the serial communication time are consistent with the time of reception of the switching noise resistant state at the time of at least one of the reception of the data among a plurality of times of the reception of the data.

Abstract: A data reception unit carries out reception of data, which consists of a combination of switching noise resistant states and switching noise nonresistant states, over a fixed serial communication time a plurality of times for each fixed serial communication period same as the one or a plurality of the switching periods. A serial communication time setting unit sets the serial communication time different from one or a plurality of the switching periods, based on the switching period, the serial communication period, and the communication speed of the data communication device, so that the starts of all of the switching periods within the serial communication time are consistent with the time of reception of the switching noise resistant state at the time of at least one of the reception of the data among a plurality of times of the reception of the data.