Kim says another special feature is the custom-made motor controller.

金表示这种机器人的另一个特点就是定制的马达控制器。

So we have a relative small volume and we needed to fit a brushless motor controller, a flywheel, a breaking mechanism, electronics a radio and a battery.

所以我们的体积相对较小，我们需要安装无刷电机控制器、飞轮、制动机构、电子设备、收音机和电池。