초록 ▼

An actuator is provided with a rotor formed to include teeth at a predetermined pitch and a rotation control coil is wound on each of plural pole pieces formed on a core member opposing the rotor, the coils forming first, second, third and fourth magnetic poles. The rotor is rotatatively driven and

An actuator is provided with a rotor formed to include teeth at a predetermined pitch and a rotation control coil is wound on each of plural pole pieces formed on a core member opposing the rotor, the coils forming first, second, third and fourth magnetic poles. The rotor is rotatatively driven and angularly positioned by attracting forces between the magnetic poles and the teeth of the rotor. Magnetic flotation coils are wound on the base portion of the magnetic member to form magnetic flotation poles. The rotor is floated magnetically by attracting forces between the magnetic flotation poles and the teeth of the rotor. In an embodiment, the rotor is provided with grooves crossing the teeth to form the teeth into a mesh-like configuration. The mesh-like teeth cooperate with the magnetic poles to provide a holding force in the axial direction, so that a function equivalent to that of a thrust bearing may be performed.

대표청구항 ▼

A magnetically floating actuator having an angular positioning function, comprising: a rotor having surface teeth spaced circumferentially at a predetermined pitch; a stator comprising a core member having poles arranged in a plurality of pole groups, said groups being arranged in diametrically oppo

A magnetically floating actuator having an angular positioning function, comprising: a rotor having surface teeth spaced circumferentially at a predetermined pitch; a stator comprising a core member having poles arranged in a plurality of pole groups, said groups being arranged in diametrically opposite pairs of groups and said stator including at least two circumferentially spaced pairs of said pole groups; each pole group including a plurality of poles formed with spaced teeth juxtaposed to said rotor teeth to form a stepping motor; and a plurality of winding means on each said pole group, said winding means comprising a first winding means having at least one coil arranged on each pole group so as to control said pole group as a magnetic flotation means for said rotor and a second winding means comprising coils wound on said poles so as to constitute angular position means for said rotor as the rotor of said stepping motor about its axis of rotation.