We claim:
1. A forced air cooling-type power conversion device (100) including power conversion
circuits (20, 40) equipped with a plurality of semiconductor elements (25) and a capacitor (30) that stores direct-current power supply, the forced air cooling-type power conversion device (100) converting electric power input from a power supply into an arbitrary value and outputting the electric power to a motor (60a-60d), the forced air cooling-type power conversion device (100) comprising:
converter power conversion modules (20a-20d) and inverter power conversion modules (40a-40d) each including: a part of the semiconductor elements (25) configuring the power conversion circuit (20, 40);
a cooler base section (27a-27d) on which the semiconductor elements (25) are mounted;
a cooler fin section (26a-26d) provided on a rear side of a surface in the cooler base section on which the semiconductor elements (25) are mounted; and
power conversion sub-blocks (75a-75d) each including: a cooler attachment member (72a-72d) to which the cooler fin sections in at least a pair of the converter or inverter power conversion modules (20a, 20b) are attached to face each other, the plurality of the cooler fin sections (26a-26d) arranged on an inner side of the cooler attachment member being collectively cooled by cooling air, and characterized by further comprising:
conductor plates (73a-73d) connected to the semiconductor elements, and a connection conductor plate (74a, 74b) that connects a plurality of the conductor plates (73a-73d),
wherein a plurality of the power conversion sub-blocks (75a, 75b) configure a power conversion block (70a, 70b) with a plurality of the conductor plates (73a, 73b) arranged perpendicularly to a connection conductor plate (74a, 74b) arranged in parallel to the bottom surface of the forced air cooling-type power conversion device (100), and a capacitor conductor plate (80) is connected to the capacitor (30),
wherein the capacitor conductor plate (80) and the connection conductor plate (74a, 74b) of the power conversion block are configured to be capable of being connected to and disconnected from each other by a conductor connection member (81),

wherein the connection conductor plate (74a, 74b) is arranged on an upper side or a lower side of the power conversion block and arranged in a direction in which a length direction thereof is orthogonal to a direction of the cooling air, and
the power conversion blocks (70a, 70b) are configured by a set of two converter power conversion modules (20a-20d) and a set of two inverter power conversion modules (40a-40d).
2. The forced air cooling-type power conversion device (100) according to claim 1,
comprising:
a cooling fan (65a, 65b); and
an air guide member (66) that couples the cooling fan (65a, 65b) and the cooler attachment member (72a, 72b),
the forced air cooling-type power conversion device (100) being configured to circulate, with the air guide member (66), the cooling air to an opened section of the cooler attachment member (72a, 72b), where the cooler fin sections (26a-26d) are present, wherein
a seal member (106) is arranged on at least one of the cooler attachment member side of the air guide member (66) and the air guide member side of the cooler attachment member (72a, 72b), and at least the power conversion module is configured to be capable of being drawn out to outside of the device so as to be attached and detached.
3. The forced air cooling-type power conversion device (100) according to claim 1,
comprising:
a cooling fan (65a, 65b); and
an air guide member (66) that couples the cooling fan (65a, 65b) and the cooler attachment member (72a, 72b),
the forced air cooling-type power conversion device (100) being configured to blow, with the air guide member (66), the cooling air to an opened section of the cooler attachment member (72a, 72b), where the cooler fin sections (26a-26d) are present, wherein
a seal member (106) is arranged on at least one of the cooling fan side of the air guide member (66) and the air guide member side of the cooling fan (65a, 65b), and at least the

power conversion modules are configured to be capable of being drawn out to outside of the device so as to be attached and detached.
4. The forced air cooling-type power conversion device (100) according to claim 1,
comprising a plurality of semiconductor elements (25),
power conversion sub-blocks (75a-75d) each including at least a pair of the power conversion modules (20a, 20b);
a power conversion block (70a, 70b) obtained by connecting a plurality of the power conversion sub-blocks (75a-75d) using a connection conductor plate (74a, 74b);
slide rails (lOla-lOld) provided in the power conversion device, the slide rails supporting the power conversion block (70a, 70b);
wherein conductor plates (73a, 73b) connected to the plurality of semiconductor elements are arranged perpendicularly to the connection conductor plate (74a, 74b) arranged in parallel to a bottom surface of the power conversion device, and one end portion of the connection conductor plate of (74a, 74b) the power conversion block is configured to be connectable to a connection conductor plate of another power conversion block via the capacitor (30), and
the power conversion block (70a, 70b) is configured to be capable of being drawn out to an outside of the device and attached and detached.
5. The forced air cooling-type power conversion device according to claim 4, wherein
the connection conductor plate (74a, 74b) and the capacitor conductor plate (80) are arranged
horizontally along a device floor surface and include an opened section and a cover on a
device lower surface to enable the conductor connection member to be attached and
detached.