Hall-effect based linear motor controller
First Claim
Patent Images
1. A device comprising:
- a coil driver to drive a coil that,-hen 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 inputwherein the interface comprises a first difference amplifier comprising a first port configured to receive the first input, a second port configured to receive the second input and a third port to provide an output of the first difference amplifier,wherein the interface further comprises a second difference amplifier comprising a first port configured to receive the output of the first difference amplifier and a second port configured to provide the input signal to the coil driver, andwherein the second difference amplifier further comprises a third port coupled to the coil driver and coupled to ground through a sense resistor.
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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.
90 Citations
19 Claims
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1. A device comprising:
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a coil driver to drive a coil that,-hen 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 wherein the interface comprises a first difference amplifier comprising a first port configured to receive the first input, a second port configured to receive the second input and a third port to provide an output of the first difference amplifier, wherein the interface further comprises a second difference amplifier comprising a first port configured to receive the output of the first difference amplifier and a second port configured to provide the input signal to the coil driver, and wherein the second difference amplifier further comprises a third port coupled to the coil driver and coupled to ground through a sense resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 16, 17, 18, 19)
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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 wherein the interface comprises a first difference amplifier comprising a first port configured to receive the first input, a second port configured to receive the second input and a third port to provide an output of the first difference amplifier, wherein the interface further comprises a second difference amplifier comprising a first port configured to receive the output of the first difference amplifier and a second port configured to provide the input signal to the coil driver, and wherein the second difference amplifier further comprises a third port coupled to the coil driver and coupled to ground through a sense resistor. - View Dependent Claims (12, 13, 14, 15)
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Specification