Yamaha Hatsudoki Kabushiki Kaisha

Yamaha Motor Engineering Co., Ltd.

Hideki Matsueda

Hiroshi Tanaka

Hirotoshi Yamauchi

Hideki Shirazawa

Mikio Saitou

Hiroaki Yagi

Hideaki Suzuki

Mitsuru Koshimizu

Yoshinori Shima

Yuuto Iyoda

Takayuki Atsumi

An electric bike includes a wheel driving apparatus. The wheel driving apparatus includes an electric wheel drive motor which drives a wheel, a gap changer which changes a gap length in the wheel drive motor, and a motor control unit which controls the wheel drive motor and the gap changer. The motor control unit calculates a target gap length for the gap changing motor in the gap changer based on an accelerator opening-degree signal, a rotation speed, a q-axis electric-current command value, a power source voltage, and a voltage utilization rate. Then, a feedback control is provided to the gap changer based on a difference value between the target gap length and the actual gap-length. A good vehicle characteristic is obtained without being affected by individual variability or operating environment of the electric motor through efficient drive of the electric motor from a low-speed range through a high-speed range.

Wheel driving apparatus and electric vehicle including the same

Growing community of inventors

Shizuoka, Japan

Hideki Matsueda