Yanmar Co., Ltd.

Shinichi Motegi

Tomoyuki Ebihara

Keiji Matsumoto

Kazuma Moriguchi

Mitsuhiro Nakagaki

An electric riding mower efficiently cools a motor driver. The mower includes two running motorsindependently driving paired rear tires; a mower blade mowing grass by being rotated; a mowing motorrotating the mower blade; a batterysupplying electric power to the running motorsand the mowing motor; and a mower-motor driver MD controlling the rotational speed of the mowing motor, wherein the mower-motor driver MD is disposed in a driver storage part on a front part of the mower, and a slitSL taking in external air is disposed on a front surface of the driver storage part.

Electric riding mower having air-cooled chassis and pivotable protective cowling

There is provided a DC-DC converter circuit with which conduction loss between switching elements is lower than in the conventional art, which affords an increase in power conversion efficiency. A DC-DC converter circuit includes a first switching element including a first semiconductor switch and a first diode, a second switching element including a second semiconductor switch and a second diode, an inductor connected between the cathodes of the first and second diodes, and a third switching element and a fourth switching element provided so as to face in mutually opposite directions on the anode sides of the first and second diodes, wherein a first voltage supply is connected between the cathode side of the first diode and the anode side of the second diode, and a second voltage supply is connected between the anode side of the first diode and the cathode side of the second diode.

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Osaka, Japan

Shinichi Motegi