Linear actuator control system for platform stabilization
First Claim
1. An inertial actuator stabilizing system for stabilizing a platform against vibration comprising:
- an actuator guide supported on said platform by first and second end pieces;
first, second and third rows of permanent magnets supported by said end pieces, about an axis of said actuator guide, and parallel to said actuator parallel to said axis and spaced therefrom;
a movable coil having windings coaxial with said actuator guide which slides over said actuator guide between said rows of magnets in response to a current flowing through said coil windings;
an accelerometer coupled to said platform for sensing acceleration forces applied to said platform; and
,electronic means connected to said accelerometer for producing a current for said movable coil windings which generates a force on said movable coil having a direction opposite to said sensed acceleration forces.
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Accused Products
Abstract
An inertial linear actuator for stabilizing a platform against vibration includes a movable coil having windings which may be energized, supported on an actuator guide for movement. The actuator guide is fixed to the platform and a current is supplied to the movable coil to generate a force for damping sensed vibrations on the platform surface. Permanent magnets parallel to the actuator guide, and a current in the movable coil results in a force being introduced between the movable coil and the stationary actuator guides. A control system on the platform supplies a feedback signal from an accelerometer coupled to the platform to drive electronics. The drive electronics produce a current having the magnitude and direction for creating the actuator force for damping the sensed disturbance.
47 Citations
15 Claims
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1. An inertial actuator stabilizing system for stabilizing a platform against vibration comprising:
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an actuator guide supported on said platform by first and second end pieces; first, second and third rows of permanent magnets supported by said end pieces, about an axis of said actuator guide, and parallel to said actuator parallel to said axis and spaced therefrom; a movable coil having windings coaxial with said actuator guide which slides over said actuator guide between said rows of magnets in response to a current flowing through said coil windings; an accelerometer coupled to said platform for sensing acceleration forces applied to said platform; and
,electronic means connected to said accelerometer for producing a current for said movable coil windings which generates a force on said movable coil having a direction opposite to said sensed acceleration forces. - View Dependent Claims (2, 3, 4, 5, 6)
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7. In a system for stabilizing a platform against acceleration forces applied to said platform, an inertial actuator comprising:
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an actuator guide supported on said platform by first and second end pieces; a plurality of rows of permanent magnets parallel to said actuator guide, and spaced apart therefrom along a common radius; a movable coil having a plurality of windings coaxial to said actuator guide inside said common radius, said coil being freely slidable over said actuator guide in response to an electric current applied thereto; and
,first and second position sensing coils on each end of said actuator guide, said sensing coils being connected together to provide a differential voltage having a polarity and magnitude proportional to the position of said movable coil. - View Dependent Claims (8, 9, 10, 11)
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12. An inertial actuator for generating a linear force comprising:
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a cylindrical support having an axis aligned in a direction of a force to be generated; a cylindrical coil form supported for sliding contact with said cylindrical support, said coil form including a coil winding having first and second ends, said first end in electrical contact with said cylindrical support; a cylindrical brush coaxial with said support and coil form, having an inner surface in sliding contact with said coil winding second end; a toroidal permanent magnet means having an axis coaxial with said cylindrical support, directing a magnetic flux through said coil; and
,a cylindrical housing enclosing said cylindrical support, coil form and toroidal permanent magnet means, said housing being terminated at each end with first and second end pieces, forming a magnetic circuit with said cylindrical support and toroidal permanent magnet means. - View Dependent Claims (13, 14, 15)
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Specification