Reducing bias in an accelerometer via current adjustment
First Claim
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1. An accelerometer comprising:
- a first stator comprising a first magnet;
a second stator comprising a second magnet;
a proof mass assembly disposed between the first stator and the second stator, the proof mass assembly comprising;
a first coil configured to receive a first amount of current; and
a second coil configured to receive a second, different amount of current; and
a controller comprising a resistor coupled in series to the first coil, wherein the controller is configured to distribute the first amount of current to the first coil and the second, different amount of current to the second coil, wherein the first amount of current distributed to the first coil is based at least in part on a resistance value of the resistor, and wherein the resistance value of the resistor is based at least in part on a resistance value of the first coil, a resistance value of the second coil, and a ratio of a first minor loop slope associated with the first magnet to a second minor loop slope associated with the second magnet.
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Abstract
An accelerometer includes a first stator, a second stator, a proof mass assembly disposed between the first stator and second stator, and a controller. The first stator includes a first magnet and the second stator includes a second magnet. The proof mass assembly includes a first coil configured to receive a first amount of current and a second coil configured to receive a second amount of current. The controller is configured to distribute the first amount of current to the first coil and the second amount of current to the second coil. The first amount of current is different than the second amount of current.
19 Citations
20 Claims
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1. An accelerometer comprising:
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a first stator comprising a first magnet; a second stator comprising a second magnet; a proof mass assembly disposed between the first stator and the second stator, the proof mass assembly comprising; a first coil configured to receive a first amount of current; and a second coil configured to receive a second, different amount of current; and a controller comprising a resistor coupled in series to the first coil, wherein the controller is configured to distribute the first amount of current to the first coil and the second, different amount of current to the second coil, wherein the first amount of current distributed to the first coil is based at least in part on a resistance value of the resistor, and wherein the resistance value of the resistor is based at least in part on a resistance value of the first coil, a resistance value of the second coil, and a ratio of a first minor loop slope associated with the first magnet to a second minor loop slope associated with the second magnet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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distributing, by a controller of an accelerometer, a first amount of current to a first coil and a resistor coupled in series to the first coil; and distributing, by the controller, a second, different amount of current to a second coil, wherein a first stator of the accelerometer comprises a first magnet, wherein a second stator of the accelerometer comprises a second magnet, wherein a proof mass assembly of the accelerometer is disposed between the first stator and second stator and comprises the first coil and the second coil, and wherein the first amount of current is based at least in part on a resistance value of the resistor and the resistance value of the resistor is based at least in part on a resistance value of the first coil, a resistance value of the second coil, and a ratio of a first minor loop slope associated with the first magnet to a second minor loop slope associated with the second magnet. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method comprising:
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determining a first minor loop slope associated with a first magnet of a first stator of an accelerometer, determining a second minor loop slope associated with a second magnet of a second stator of the accelerometer; and distributing, by a controller of the accelerometer, a first amount of current to a first coil of a proof mass assembly disposed between the first stator and second stator, distributing, by the controller, a second, different amount of current to a second coil, wherein a ratio of the first amount of current to the second, different amount of current is inversely proportional to the ratio of the first minor loop slope associated with the first magnet to the second minor loop slope associated with the second magnet. - View Dependent Claims (18, 19, 20)
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Specification