MAGNETIC MULTI-TURN ABSOLUTE POSITION DETECTION DEVICE
First Claim
1. A magnetic device for detecting the absolute position of a rotating input shaft, the device comprising:
- a main rotor comprising a main magnet secured to the input shaft effecting a travel of n times 360°
, n being greater than 1, and a driving member of a motion converter;
at least one first magnetosensitive probe delivering, over a magnetic angle of 360°
, a signal proportional to a direction of a magnetic field generated by the main magnet to derive a measurement of absolute position of the input shaft;
a secondary magnet having two magnetic poles and effecting a travel of around 360°
under effect of the rotation of the input shaft via a motion converter;
at least one second magnetosensitive probe delivering, over a magnetic angle of around 360°
, a signal proportional to the direction of a magnetic field generated by the secondary magnet and able to derive therefrom a measurement of absolute position of the secondary magnet;
the second probe and the secondary magnet constituting a position sensor of epsilon precision, expressed as a percentage;
the secondary magnet being substantially positioned within a height H defined by upper and lower planes of the main rotor; and
the main magnet being multipole and having P pairs of poles, where P is greater than 1.
1 Assignment
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Accused Products
Abstract
The disclosure relates to a magnetic device for detecting the absolute position of an input shaft capable of rotating more than 360°, the device including a main magnetic sensor, a motion reducer, and a secondary magnetic sensor, wherein the main magnetic sensor is connected to a rotor, measures the rotation of the shaft for ranges of angles of less than 360°, and includes a main magnet, the motion reducer converts the rotation of the shaft into a reduced rotation, the maximum amplitude of which is equal to no more than 360°, and the secondary magnetic sensor measures the reduced rotation and includes a secondary magnet. According to the disclosure, the secondary magnet is arranged between the upper and lower planes of the main rotor, and the main magnet has P pairs of poles, where P is greater than 1.
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Citations
20 Claims
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1. A magnetic device for detecting the absolute position of a rotating input shaft, the device comprising:
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a main rotor comprising a main magnet secured to the input shaft effecting a travel of n times 360°
, n being greater than 1, and a driving member of a motion converter;at least one first magnetosensitive probe delivering, over a magnetic angle of 360°
, a signal proportional to a direction of a magnetic field generated by the main magnet to derive a measurement of absolute position of the input shaft;a secondary magnet having two magnetic poles and effecting a travel of around 360°
under effect of the rotation of the input shaft via a motion converter;at least one second magnetosensitive probe delivering, over a magnetic angle of around 360°
, a signal proportional to the direction of a magnetic field generated by the secondary magnet and able to derive therefrom a measurement of absolute position of the secondary magnet;the second probe and the secondary magnet constituting a position sensor of epsilon precision, expressed as a percentage; the secondary magnet being substantially positioned within a height H defined by upper and lower planes of the main rotor; and the main magnet being multipole and having P pairs of poles, where P is greater than 1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system comprising at least one magnetic device detecting an absolute position and a steering column, the magnetic device detecting the torsion of the steering column;
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the at least one magnetic device operably detecting the relative angular position of coaxial input and output shafts connected by a torsion bar in order to derive therefrom the torsion torque exerted on the bar, including a first rotor magnetic structure comprising a plurality of magnets, and a second stator structure in the vicinity of which at least one magnetosensitive probe is placed; a main rotor comprising a main magnet secured to the input shaft effecting a travel greater than 360°
, and a driving member of a motion converter;at least a first magnetosensitive probe delivering, over a magnetic angle of 360°
, a signal proportional to a direction of a magnetic field generated by the main magnet and deriving therefrom a measurement of absolute position of the input shaft;a secondary magnet having two magnetic poles and effecting a travel of around 360°
under effect of the rotation of the input shaft via a motion converter;at least a second magnetosensitive probe delivering, over a magnetic angle of around 360°
, a signal proportional to the direction of a magnetic field generated by the secondary magnet and deriving therefrom a measurement of absolute position of the secondary magnet;the second probe and the secondary magnet constituting a position sensor; the secondary magnet being substantially positioned within a height defined by upper and lower planes of the main rotor; and the main magnet having multiple pairs of poles; the main magnet being substantially concentric with the stator structure; at least one of the magnetosensitive probes of the relative angular position detection device and the first and second probes being substantially positioned within the height defined by the upper and lower planes of the main rotor. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification