HALL-EFFECT BASED LINEAR MOTOR CONTROLLER
First Claim
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1. A device comprising:
- a coil driver to drive a coil that, when driven, effects a linear displacement of a motion device having a magnet;
a magnetic field sensor to detect a magnetic field associated with the linear displacement and to produce an output signal in response thereto; and
an interface, responsive to requests provided by an external controller and corresponding to desired linear displacements of the motion device, to receive a request as a first input and the magnetic field sensor output signal as a second input, and to produce an input signal to the coil driver having a level indicative of a relationship of the second input with respect to the first input.
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Abstract
A linear motion control device for use in a linear control system is presented. The linear motion control device includes a coil driver to drive a coil that, when driven, effects a linear movement by a motion device having a magnet. The linear motion control device also includes a magnetic field sensor to detect a magnetic field associated with the linear movement and an interface to connect an output of the magnetic field sensor and an input of the coil driver to an external controller. The interface includes a feedback loop to relate the magnetic field sensor output signal to the coil driver input.
34 Citations
20 Claims
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1. A device comprising:
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a coil driver to drive a coil that, when driven, effects a linear displacement of a motion device having a magnet; a magnetic field sensor to detect a magnetic field associated with the linear displacement and to produce an output signal in response thereto; and an interface, responsive to requests provided by an external controller and corresponding to desired linear displacements of the motion device, to receive a request as a first input and the magnetic field sensor output signal as a second input, and to produce an input signal to the coil driver having a level indicative of a relationship of the second input with respect to the first input. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 17, 18, 19, 20)
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11. A system comprising:
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a controller; and a linear motion control device, coupled to the controller, comprising; a coil driver to drive a coil that, when driven, effects a linear displacement of a motion device having a magnet; a magnetic field sensor to detect a magnetic field associated with the linear displacement and to produce an output signal in response thereto; and an interface, responsive to requests provided by the controller and corresponding to desired linear displacements of the motion device, to receive a request as a first input and the magnetic field sensor output signal as a second input, and to produce an input signal to the coil driver having a level indicative of a relationship of the second input with respect to the first input. - View Dependent Claims (12, 13, 14, 15)
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16. A method of controlling a motion device having a magnet that is movable relative to a coil, comprising:
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receiving a first signal corresponding to a request from a controller that provides requests representing desired linear displacements; receiving a second signal obtained from sensing a magnetic field associated with the magnet; producing from the first signal and second signal a third signal having a level indicative of a relationship of the second signal with respect to the first signal; and applying current to the coil according to the third signal.
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Specification