| 摘要 |
An electric motor for use in a borehole tool, comprising: a housing; a plurality of stator windings spaced along the inside of the housing; an output shaft located in the housing; a plurality of rotors disposed on the output shaft and aligned with the stators so as to define a plurality of motor sub-units; and separate power supplies and control systems for each motor sub-unit; wherein each motor sub-unit is separately controllable by means of its associated power supply and control system. The output shaft can comprise a single shaft with the rotors disposed thereon or a plurality of sub-shafts connected end to end with each rotor can be disposed on an associated sub-shaft. The sub-shafts can connected by means of articulated connections, and the housing can be articulated in the region of the connections.
|
