| 摘要 |
A drive has a housing, a machining spindle rotatable in the housing about an axis and adapted to carry a machine tool, and a motor in the housing having a stator fixed in the housing and surrounding the spindle and a rotor rotatable about the axis relative to the housing and to the spindle and surrounding the spindle. A gear transmission in the housing has an input connectable to the rotor and an output connectable to the spindle for rotating the spindle about the axis. This transmission is displaceable between a low-speed position with a sun gear meshing with planet gears and a planet carrier coupled to the spindle for rotating the spindle at a rate slower than that of the rotor and a high-speed position with the sun gear out of mesh with the planet gears and directly coupled to the spindle for rotating the spindle jointly with the rotor.
|
