Angular displacement pickup, particularly for the detection of torque in power steering
First Claim
1. A contactless angular displacement apparatus for measurement of torque, comprising:
- two coaxial disks electrically insulated from each other and having opposing faces which disks are each rotatable in relation to one another by an angle to be detected, wherein said disks carry on said opposing faces conductive plane coils with said coils being in the shape of spirally wound sectors coiled alternately in both directions and wherein the mutual induction of said coils varies as a function of the relative angular position of said disks;
at least one rotary transformer mounted coaxially with said disks;
circuit means for supplying the primary of one of said at least one rotary transformer with a high frequency signal input whereby the secondary of said one rotary transformer supplies an induction electromotive force to one of said disks; and
processing circuit means for processing signal indicating the induction electromotive force supplied by the other one of said disks.
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Accused Products
Abstract
The contactless angular displacement and/or torque pickup is characterized in that it comprises two electrically insulating coaxial disks (7a, 7b) that can turn in relation to one another by an angle to be detected and that carry on their opposing faces conductive plane coils (8) in the shape of spirally wound sectors coiled alternately in both directions and whose mutual induction varies as a function of the relative angular position of the detection disks (7a, 7b). Also included is a rotary transformer (6a, 6b) to supply one of the detection disks (7a, 7b), a circuit (18) for supplying the primary (11a) of the rotary transformer and a circuit (17, 18) for processing the signal (S) collected on one of the detection disks (7a, 7b).
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Citations
14 Claims
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1. A contactless angular displacement apparatus for measurement of torque, comprising:
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two coaxial disks electrically insulated from each other and having opposing faces which disks are each rotatable in relation to one another by an angle to be detected, wherein said disks carry on said opposing faces conductive plane coils with said coils being in the shape of spirally wound sectors coiled alternately in both directions and wherein the mutual induction of said coils varies as a function of the relative angular position of said disks; at least one rotary transformer mounted coaxially with said disks; circuit means for supplying the primary of one of said at least one rotary transformer with a high frequency signal input whereby the secondary of said one rotary transformer supplies an induction electromotive force to one of said disks; and processing circuit means for processing signal indicating the induction electromotive force supplied by the other one of said disks. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification