| 摘要 |
A camera crane has a telescoping arm on a mobile base. The mobile base has a drive motor assembly at each corner of a chassis. The drive motor assemblies may have an electric motor linked to an axle via gearing, and two or more wheels attached to the axle. The wheels can be set to free wheel, so that the mobile base may be pushed or towed, without back driving the electric motor. The wheels may also be linked to the axle, so that the electric motor can provide torque to each of the wheels. The electric motors may be separately controlled to propel and steer the mobile base. |
