Abstract: In an electromagnetic actuator for moving an object, a plurality of electromagnetic circuits is provided to produce a moving magnetic field in a substrate. There is disposed a flexible resilient plate wholly or partially made of a magnetic material. When the electromagnetic circuits impart a magnetic force to the magnetic material to produce a traveling wave in the flexible resilient plate. Also, a magnetic fluid may be disposed on the substrate and the flexible resilient plate be disposed in close contact with the surface of the magnetic fluid.

Abstract: A bearing unit comprising a rotating body, a rotating shaft and a bearing, wherein there is provided a construction with a plurality of electromagnetic poles is arranged, together with a plurality of sensors for detecting the run-out of the rotating shaft, and also comprises a control circuit for controlling the intensity of a magnetic force according to a detection output of these sensors, thereby controlling the bearing unit so that vibration and run-out of the rotating body due to inbalance thereof are effectively suppressed while making the unit to revolve around the principle axis of shape.

Abstract: A cutting apparatus for forming a noncircular cross-section on a workpiece that includes a tool advancing and retreating device. The tool advancing and retreating device includes a central shaft on which is to be mounted a tool, a journal for supporting the central shaft, a movable plate fixed to the central shaft, and electromagnets positioned opposite to one another such that the movable plate is interposed between the electromagnets with a clearance between the plate and the electromagnets. A device is provided for detecting the rotational angle of the main shaft and a displacement sensor is included for detecting the longitudinal displacement of the central shaft. A speed sensor detects the speed of the longitudinal displacement of the central shaft and an arrangement is provided for controlling the electric current passing through the electromagnets based on the output signals from the rotational angle detecting device, from the displacement sensor and from the speed sensor.

Abstract: An apparatus for effecting a fine movement of an object for making use of impact produced by a piezoelectric/electrostrictive element having a moving member, a piezoelectric/electrostrictive element attached to said moving member, means for driving the piezoelectric/electrostrictive element, and an inertia member operative in response to the driving of the piezoelectric/electrostrictive element so as to impart an impact to the moving member. As an electric field is applied to the piezoelectric/electrostrictive element, a strain is caused by a stress which acts to expand or contract the piezoelectric/electrostrictive element to a length determined by the level of the electric field. By making use of this phenomenon, impact is produced by the inertia member which operates in response to the stress, thereby effecting a step-like fine movement of the moving member.

Abstract: A precision automatic assembly apparatus for inserting an insertable part into a hole formed in a member includes a movable hand incorporating a movable body to which the insertable part is attached, and an electromagnetic wrist mechanism having a plurality of electromagnets for supporting the movable body and controlling the movable body along a plurality of axes. When the part is inserted into the hole formed in the member, an external force which acts upon the part and the position of a point at which the part contacts the member are estimated by a control unit via position sensing means incorporated in the hand. Currents supplied to the excitation coils of the electromagnetic devices are controlled on the basis of the estimate to adjust the state (position and attitude) of the insertable part, whereby the part is fitted into the hole smoothly and automatically.

Abstract: A precision automatic assembly apparatus for inserting an insertable part into a hole formed in a member includes a movable hand incorporating a movable body to which the insertable part is attached, and an electromagnetic wrist mechanism having a plurality of electromagnetic devices including air core coils and magnetic poles for supporting the movable body and controlling the movable body along a plurality of axes. When the part is inserted into the hole formed in the member, an external force which acts upon the part and the position of a point at which the part contacts the member are estimated by a control unit via position sensing means incorporated in the hand. Currents supplied to the excitation coils of the electromagnetic devices are controlled on the basis of the estimate to adjust the state (position and attitude) of the insertable part, whereby the part is fitted into the hole smoothly and automatically.

Abstract: A precision automatic assembly apparatus for inserting an insertable part into a hole formed in a member includes a movable hand incorporating a movable body to which the insertable part is attached, and an electromagnetic wrist mechanism having a plurality of electromagnetic devices including air core coils and magnetic poles for supporting the movable body and controlling the movable body along a plurality of axes. When the part is inserted into the hole formed in the member, an external force which acts upon the part and the position of a point at which the part contacts the member are estimated by a control unit via position sensing means incorporated in the hand. Currents supplied to the excitation coils of the electromagnetic devices are controlled on the basis of the estimate to adjust the state (position and attitude) of the insertable part, whereby the part is fitted into the hole smoothly and automatically.

Abstract: A controlled type magnetic bearing device which has at least two radius direction magnetic bearings, characterized in that the radius direction magnetic bearing control device has either or both of a static unbalance compensator for suppressing a whirling caused by static unbalance and a dynamic unbalance compensator for suppressing a whirling caused by dynamic unbalance.

Abstract: A linear stepping motor comprises a stationary member, a movable member, an attraction magnetic pole and a guiding magnetic pole. The movable member has four pole pieces each having a plurality of teeth facing those of the stationary member. The attraction magnetic pole maintains the movable member floated by a magnetic coil providing an attractive force. The guiding magnetic pole has four coils on the four pole pieces, and causes the movable member to move by consecutive and selective energization of the four coils.

Abstract: Where a rotating device, for example, such as a lathe, a pen-recorder, etc., is used to depict a non-circular shape, a position of a cutting tool, a pen, etc. is controlled by a method such as NC (numerical control). Generally, delay in control occurs due to the transmission characteristic of the control system, thus producing a distortion in the formed shape. This distortion can be removed by inserting an element having a reverse transmission characteristic into the control system.

Abstract: 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.

Abstract: The present invention provides a conveying system for use for carrying the work, equipped with a conveying truck having a mover of a linear pulse motor fixed at its side bottom and main travelling rails having stators mounted thereon, there being provided openings for use in operation with specified areas about the central part of the aforementioned conveying truck, thereby permitting the operation to be performed from below on the work loaded on the conveying truck, and with the stators of the aforementioned linear pulse motor located at stations for the conveying truck, the aforementioned mover and the stators composing the linear pulse motor.

Abstract: An electromagnetic bearing apparatus having five degrees of freedom includes two radial magnetic bearings. Each of the radial bearings consists of two pairs of electromagnets. The electromagnets of one pair are arranged opposite one another around a rotating shaft, and the other pair is arranged in the same perpendicular plane as the preceding pair. The pairs of electromagnets in the two radial bearings are respectively controlled to stabilize the rotating shaft to obtain automatic regulation, in which deviation of the shaft in a radial sense is compensated according to the component of shaft radial deviation and deviating velocity and the gyro-effect which will be caused by the perpendicular compensating torque to compensate the future rotation in the perpendicular component.

Abstract: A magnetic attraction system grinding method and apparatus comprised of arranging a magnetic circuit forming means between an abrasive tool and a workpiece, thereby generating a grinding pressure required to grind the surface of the workpiece, and performing the operation of the abrasive tool through a rectilinearly reciprocating movement or rotary movement working along the workpiece surface during the application of grinding pressure while controlling either grinding speed or grinding stroke. The magnetic circuit is produced with an electromagnet or permanent magnet assembly and the abrasive tool may be a magnetic material bonded grindstone.