Abstract: A motor drive apparatus includes a smoothing capacitor unit including at least one smoothing capacitor provided between a converter circuit and an inverter circuit in a power conversion circuit that generates motor drive power, a snubber capacitor for suppressing a surge voltage of a power device forming a part of the power conversion circuit, and a support plate on which the smoothing capacitor unit is mounted, wherein an electrode terminal of the smoothing capacitor unit and an electrode terminal of the snubber capacitor are placed in proximity to each other with the support plate being sandwiched between them, and a positive electrode terminal of the smoothing capacitor unit and a positive electrode terminal of the snubber capacitor are electrically connected to each other, and a negative electrode terminal of the smoothing capacitor unit and a negative electrode terminal of the snubber capacitor are electrically connected to each other.

Abstract: A power conversion apparatus includes: an inverter unit; a first capacitor group, an positive electrode of the first capacitor group connected to an positive electrode on the DC input side of the inverter unit; a second capacitor group, a negative electrode of the second capacitor group connected to a negative electrode of the DC input side of the inverter unit; a first terminal portion connected to the positive electrode of the first capacitor group; a second terminal portion connected to a negative electrode of the first capacitor group; a third terminal portion connected to an positive electrode of the second capacitor group; and a fourth terminal portion connected to the negative electrode of the second capacitor group, wherein a distance between the first terminal portion and the third terminal portion is approximately equal to a distance between the second terminal portion and the fourth terminal portion.

Abstract: A connection structure includes: a support column member extending in one direction from one end to an opposite end, with the one end attached to an installation object and the opposite end having formed therein a screw hole, the support column member being configured to be non-insertable into the through hole; a surrounding member provided on a first surface of the printed board and configured to surround the opening of the through hole and to allow the opposite end of the support column member to be inserted into the surrounding member; and a fastener configured to fix the support column member to the printed board by being screw-engaged into the screw hole of the support column member inserted into the surrounding member, from a second surface side opposite to the first surface of the printed board.

Abstract: A connection structure includes: a support column member extending in one direction from one end to an opposite end, with the one end attached to an installation object and the opposite end having formed therein a screw hole, the support column member being configured to be non-insertable into the through hole; a surrounding member provided on a first surface of the printed board and configured to surround the opening of the through hole and to allow the opposite end of the support column member to be inserted into the surrounding member; and a fastener configured to fix the support column member to the printed board by being screw-engaged into the screw hole of the support column member inserted into the surrounding member, from a second surface side opposite to the first surface of the printed board.

Abstract: A motor drive apparatus includes a smoothing capacitor unit including at least one smoothing capacitor provided between a converter circuit and an inverter circuit in a power conversion circuit that generates motor drive power, a snubber capacitor for suppressing a surge voltage of a power device forming a part of the power conversion circuit, and a support plate on which the smoothing capacitor unit is mounted, wherein an electrode terminal of the smoothing capacitor unit and an electrode terminal of the snubber capacitor are placed in proximity to each other with the support plate being sandwiched between them, and a positive electrode terminal of the smoothing capacitor unit and a positive electrode terminal of the snubber capacitor are electrically connected to each other, and a negative electrode terminal of the smoothing capacitor unit and a negative electrode terminal of the snubber capacitor are electrically connected to each other.

Abstract: A motor drive apparatus includes an inverter configured to convert an input DC voltage into an AC voltage for driving a motor, by ON/OFF driving of an internal power element, and outputs the AC voltage, a high-frequency current detection unit configured to detect a high-frequency current from a current flowing through a motor power line upon application of the AC voltage output from the inverter to the motor via the motor power line, and a stray capacitance estimation unit configured to estimate a stray capacitance occurring in the motor power line and the motor, based on the high-frequency current detected by the high-frequency current detection unit.

Abstract: A power conversion apparatus includes: an inverter unit; a first capacitor group, an positive electrode of the first capacitor group connected to an positive electrode on the DC input side of the inverter unit; a second capacitor group, a negative electrode of the second capacitor group connected to a negative electrode of the DC input side of the inverter unit; a first terminal portion connected to the positive electrode of the first capacitor group; a second terminal portion connected to a negative electrode of the first capacitor group; a third terminal portion connected to an positive electrode of the second capacitor group; and a fourth terminal portion connected to the negative electrode of the second capacitor group, wherein a distance between the first terminal portion and the third terminal portion is approximately equal to a distance between the second terminal portion and the fourth terminal portion.

Abstract: To provide a motor driver and a motor driving system which allow a reduction in power consumption of a heat exchanger provided in a power magnetics cabinet while keeping down manufacturing cost. A motor driver is accommodated in a power magnetics cabinet and drives a motor. The motor driver comprises: a storage unit that stores the quantity of heat generated independently of the value of a current I[Arms] caused to flow in the motor as a generated heat quantity a[W]; a current detection unit that detects the value of the current I[Arms] caused to flow in the motor; and a heat quantity calculation unit that calculates the quantity of heat P[W] released to the interior of the power magnetics cabinet by adding the heat quantity a[W] stored in the storage unit and a heat quantity q×K[W/Arms]×I[Arms] responsive to the value I[Arms] detected by the current detection unit.

Abstract: A motor drive apparatus includes an inverter configured to convert an input DC voltage into an AC voltage for driving a motor, by ON/OFF driving of an internal power element, and outputs the AC voltage, a high-frequency current detection unit configured to detect a high-frequency current from a current flowing through a motor power line upon application of the AC voltage output from the inverter to the motor via the motor power line, and a stray capacitance estimation unit configured to estimate a stray capacitance occurring in the motor power line and the motor, based on the high-frequency current detected by the high-frequency current detection unit.

Abstract: To provide a motor driver and a motor driving system which allow a reduction in power consumption of a heat exchanger provided in a power magnetics cabinet while keeping down manufacturing cost. A motor driver is accommodated in a power magnetics cabinet and drives a motor. The motor driver comprises: a storage unit that stores the quantity of heat generated independently of the value of a current I[Arms] caused to flow in the motor as a generated heat quantity a[W]; a current detection unit that detects the value of the current I[Arms] caused to flow in the motor; and a heat quantity calculation unit that calculates the quantity of heat P[W] released to the interior of the power magnetics cabinet by adding the heat quantity a[W] stored in the storage unit and a heat quantity q×K[W/Arms]×I[Arms] responsive to the value I[Arms] detected by the current detection unit.

Abstract: A motor driving device is equipped with a narrow pitch component group made up from a plurality of narrow pitch components having a plurality of terminals, and in which an interval between the plurality of terminals is less than or equal to a predetermined distance, a heat generating component group made up from a plurality of heat generating components, which are components other than the narrow pitch components, and which generate heat greater than or equal to a predetermined amount, a fan configured to blow wind onto the heat generating component group in order to cool the heat generating component group, and a printed board on which the narrow pitch component group is mounted in a manner so that wind is not blown onto the narrow pitch component group by the fan.

Abstract: A motor drive system enabling detection of cutting fluid deposited at a housing of electronic components. A housing holding electronic components of a motor drive system has top faces slanted with respect to the horizontal plane so as to guide the deposited cutting fluid. The housing further includes storage parts collecting the cutting fluid guided along the top faces. The storage parts may be graduated so as to enable the collected amount of the cutting fluid to be measured. The storage parts may be configured to be detachable from the housing.

Abstract: A motor driving device is equipped with a narrow pitch component group made up from a plurality of narrow pitch components having a plurality of terminals, and in which an interval between the plurality of terminals is less than or equal to a predetermined distance, a heat generating component group made up from a plurality of heat generating components, which are components other than the narrow pitch components, and which generate heat greater than or equal to a predetermined amount, a fan configured to blow wind onto the heat generating component group in order to cool the heat generating component group, and a printed board on which the narrow pitch component group is mounted in a manner so that wind is not blown onto the narrow pitch component group by the fan.

Abstract: A motor drive system enabling detection of cutting fluid deposited at a housing of electronic components. A housing holding electronic components of a motor drive system has top faces slanted with respect to the horizontal plane so as to guide the deposited cutting fluid. The housing further includes storage parts collecting the cutting fluid guided along the top faces. The storage parts may be graduated so as to enable the collected amount of the cutting fluid to be measured. The storage parts may be configured to be detachable from the housing.