Fanuc Corporation

Takaaki Tagawa

Shinichi Horikoshi

A connection structure, of a short bar forming a conductive path and a land on a printed circuit board, in which the short bar includes a plate portion having a flat plate shape and a protrusion protruding in a stepped shape from a surface of the plate portion, the protrusion is threadably fastened to the printed circuit board by a screw inserted into a land-side through hole formed through the land, from an opposite side of the printed circuit board with respect to the protrusion, in a state where a flat surface portion formed, at a position spaced apart from the surface of the plate portion, on an outer surface of the protrusion is in close contact with the land.

Connection structure of short bar and land on printed circuit board, and motor driving apparatus

A motor drive apparatus includes: a rectifier; an inverter; a DC link voltage detection unit; an input current detection unit configured to detect input current inputted to the rectifier; a DC link voltage comparison unit configured to compare a DC link voltage with a first voltage threshold value and with a second voltage threshold value; a current comparison unit configured to compare the input current with a current threshold value; and an abnormality detection unit configured, in a case that the DC link voltage is smaller than the first voltage threshold value or that the DC link voltage is greater than the second voltage threshold value, to determine that a first abnormality has occurred when the input current is smaller than the current threshold value and to determine that a second abnormality has occurred when the input current is equal to or greater than the current threshold value.

Motor drive apparatus configured to determine cause of DC link voltage fluctuation

A rectifier according to an aspect of the present disclosure includes: a bridge circuit that derives a positive voltage component and a negative voltage component from an AC power supply voltage; a smoothing capacitor that smooths an output voltage from the bridge circuit; a pre-charge resistor that is provided between the bridge circuit and the smoothing capacitor, and reduces an inrush current; a charge switch that is provided in parallel with the pre-charge resistor; and a controller that controls the charge switch between an open state and a close state, wherein when application of the AC power supply voltage to the bridge circuit is started, the controller closes the charge switch if a voltage applied between ends of the pre-charge resistor is determined to become equal to or lower than a predetermined resistor threshold voltage.

Rectifier and motor driving device

A motor driving device includes a heat sink, a rectifier provided on the heat sink and configured to rectify an AC voltage supplied from an AC power supply to a DC voltage, a charging resistor provided on the heat sink and configured to be used for charging a smoothing capacitor for smoothing the DC voltage rectified by the rectifier, and a temperature sensor with which the charging resistor is provided.

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Yamanashi, Japan

Takaaki Tagawa