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US 7,679,246 B2Granted
Actuator
AssigneeRigaku Corporation
InventorsMasaaki Yamakata, Yuji Kobayashi, Kiyoshi Akiyama
Life of this patent
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AssigneeRigaku Corporation
InventorsMasaaki Yamakata, Yuji Kobayashi, Kiyoshi Akiyama
Estimating the term…
A case (100), a rotor (200) that is freely rotatably supported in the case (100), and stators (110) for rotating the rotor by magnetic force are provided. The stator (110) contains a core (111) mounted at the outside of the case (100), and a magnetic coil (112) wound around the core (111). An end face of the core (111) constituting a magnetic pole is formed of at least non-laminate ferromagnetic substance, and exposed to the inner surface of the case (100) so as to form a part of the inner wall of the case (100).
An actuator, comprising:
An actuator, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Structural association with bearings: with magnetic bearings
Bearings not otherwise provided for: using magnetic or electric supporting means
Consisting of a generally annular yoke with salient poles: sectional cores
Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures: to outer stators
Term ended 3 Aug 2026 (estimated)
The present invention relates to an actuator having a mover freely movable in a case and stators for driving the mover by magnetic force, and particularly to an actuator suitably usable under high-vacuum or high-temperature environment.
A vacuum motor is known as an actuator used for a driving source such as a vacuum pump, a turbo molecular pump or the like. The vacuum motor is equipped with a rotor and a stator comprising an electromagnet for rotationally driving the rotor. As well known, the electromagnet is formed by winding a magnetic coil around a core. A laminate steel plate is used as the core constituting the electromagnet. The laminate steel plate is constructed by adhesively attaching plural thin steel plates to one another with resin adhesive agent.
It is required for the vacuum motor to keep the inside of the case to a high-vacuum atmosphere. In the conventional vacuum motor, a rotor and a stator are disposed in the case (JP-A-10-288191), and also a laminate steep plate is used as the core of an electromagnet constituting the stator, so that it is difficult to keep a high vacuum atmosphere in the case due to an effect of gas discharged from resin adhesive agent sandwiched between laminate steels.
FIG. 1 is a cross-sectional front view showing an embodiment in which the present invention is applied to a rotary motor device.
FIG. 2 is a partially cross-sectional front view showing the construction of a rotor.
FIG. 3 is a cross-sectional front view showing a case and parts mounted in the case.
Preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional front view showing an embodiment in which the present invention is applied to a rotary type motor device. FIGS. 2 and 3 are diagrams showing the constituent elements of the motor device shown in FIG. 1, and FIG. 2 is a partially cross-sectional front view showing the construction of the rotor. FIG. 3 is a cross-sectional front view showing a case and parts mounted there.
The motor device shown in these figures is equipped with a construction suitable to a vacuum motor operated under high temperature.