| 摘要 |
A combined linear-rotary direct drive step motor, having a rotary section and a linear section in a single housing, comprising a cylindrically shaped variable reluctance linear step motor (103); a modified hybrid permanentmagnet rotary step motor; and a common shaft (102) shared by said linear step motor and said rotary step motor. The teeth (110, 111) of the rotary motor are circumferentially spaced around the stator pole faces and rotor; while in the linear portion of the motor, the teeth are longitudinally spaced along the face of the stator poles and rotor. Except for the teeth, the shape of the stator poles in the rotary and linear sections are identical. The laminated stators and rotors reduce eddy current losses at high stepping speeds. The stator coils of both motor sections are separate and can be energized independently allowing any combination of rotary or linear motion. In an alternate embodiment of the invention, the rotor is fabricated from stacked laminations, in a waffle board like configuration. Such a motor contains no magnets in the rotor and operates as a variable reluctance motor. The rotor laminations are identical for both rotary and linear motion. Accordingly, the rotor can be made as long as practical for a particular application, with stroke not being limited to stator length. <IMAGE> |
