Magnetoresistive angular position sensor and rotation speed sensor
First Claim
1. A sensor for sensing at least one of angular position and rotation speed, the sensor comprising:
- a permanent magnet rotatable about an axis of rotation;
at least three Wheatstone bridges each having four bridge resistors formed of magnetoresistive strip lines extending in planes parallel to a rotation plane of said permanent magnet;
said bridge resistors of each of said at least three Wheatstone bridges being disposed on respective sides of quadrangles corresponding to respective ones of said at least three Wheatstone bridgeseach of said at least three Wheatstone bridges having two adjacently arranged ones of said bridge resistors connected to a half-bridge of respective ones of said at least three Wheatstone bridges;
said quadrangles being disposed relative to one another rotated by a preselectable angle α
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said at least three Wheatstone bridges each having an intersection point of virtual diagonals connecting corners of respective ones of said quadrangles, said intersection points being arranged substantially concentrically about said axis of rotation; and
said at least three Wheatstone bridges being disposed so as to be equally and evenly swept by a field of the permanent magnet during rotation thereof to saturate said bridge resistors.
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Accused Products
Abstract
A sensor for sensing at least one of angular position and rotation speed comprises a permanent magnet rotatable about an axis of rotation and at least three Wheatstone bridges each having four bridge resistors formed of magnetoresistive strip lines extending in planes parallel to a rotation plane of the permanent magnet. The bridge resistors of each of the at least three Wheatstone bridges are disposed on respective sides of quadrangles corresponding to respective ones of the at least three Wheatstone bridges. Each of the at least three Wheatstone bridges has two adjacently arranged ones of the bridge resistors connected to a half-bridge of respective ones of the at least three Wheatstone bridges. The quadrangles are disposed relative to one another rotated by a preselectable angle α. The at least three Wheatstone bridges each have an intersection point of virtual diagonals connecting corners of respective ones of the quadrangles, the intersection points being arranged substantially concentrically about the axis of rotation, and the at least three Wheatstone bridges are disposed so as to be equally and evenly swept by a field of the permanent magnet during rotation thereof to saturate the bridge resistors.
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Citations
19 Claims
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1. A sensor for sensing at least one of angular position and rotation speed, the sensor comprising:
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a permanent magnet rotatable about an axis of rotation; at least three Wheatstone bridges each having four bridge resistors formed of magnetoresistive strip lines extending in planes parallel to a rotation plane of said permanent magnet; said bridge resistors of each of said at least three Wheatstone bridges being disposed on respective sides of quadrangles corresponding to respective ones of said at least three Wheatstone bridges each of said at least three Wheatstone bridges having two adjacently arranged ones of said bridge resistors connected to a half-bridge of respective ones of said at least three Wheatstone bridges; said quadrangles being disposed relative to one another rotated by a preselectable angle α
;said at least three Wheatstone bridges each having an intersection point of virtual diagonals connecting corners of respective ones of said quadrangles, said intersection points being arranged substantially concentrically about said axis of rotation; and said at least three Wheatstone bridges being disposed so as to be equally and evenly swept by a field of the permanent magnet during rotation thereof to saturate said bridge resistors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A sensor for sensing at least one of angular position and rotation speed, the sensor comprising:
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a permanent magnet rotatable about an axis of rotation; at least three Wheatstone bridges each having four bridge resistors formed of magnetoresistive strip lines extending in planes parallel to a rotation plane of said permanent magnet; said bridge resistors of each of said at least three Wheatstone bridges being disposed on respective sides of quadrangles corresponding to respective ones of said at least three Wheatstone bridges; each of said at least three Wheatstone bridges having two adjacently arranged ones of said bridge resistors connected to a half-bridge of respective ones of said at least three Wheatstone bridges; said quadrangles being disposed relative to one another rotated by a preselectable angle α
;said at least three Wheatstone bridges each having an intersection point of virtual diagonals connecting corners of respective ones of said quadrangles, said intersection points being arranged substantially coaxially with said axis of rotation; and said at least three Wheatstone bridges being disposed so as to be equally and evenly swept by a field of the permanent magnet during rotation thereof to saturate said bridge resistors.
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Specification