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US 2021/0278252 A1Published application
Magnetic encoder
AssigneeZF Automotive UK Limited
InventorsAri Akbar Hassan Al-Jaf, Harvey Smith, John Gorton
Life of this patent
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AssigneeZF Automotive UK Limited
InventorsAri Akbar Hassan Al-Jaf, Harvey Smith, John Gorton
Estimating the term…
A magnetic encoder comprising an encoder element having at least two tracks of encoder regions, each region comprising a magnetic pole, the poles along each track being arranged as an alternating pattern of North and South poles, and one or more sensors, each sensor comprising one or more sensing elements associated with a respective track and generating an output that is indicative of the magnetic field associated with that track in the vicinity of the sensor, in which at least one track has a differing number of poles to at least one of the other tracks, and in which the properties of the poles of a first one of the tracks differ along the track such that there is a periodic variation along the first track of the magnetic field emitted by the first track that is detected by the sensing elements associated with the first track which at least partially cancels out a corresponding periodic variation in field from the other tracks that is also detected by the sensing elements associated with the first track.
A magnetic encoder comprising of an encoder element including one or more magnetized elements that in use is fixed to a backing member, the one or more elements together defining at least two tracks of encoder regions, each region comprising a magnetic pole, the poles along each track being arranged as an alternating pattern of North and South poles,
A magnetic encoder according to any preceding claim in which the feature may defines a keying portion that provides a mechanical attachment point for a mechanical fixing.
A magnetic encoder according to any preceding claim in which the feature receives a portion of the mechanical fixing that engages the track or a space between poles in the track or adjacent one or more poles in the track that interferes with the magnetic field of one or more of the poles it is adjacent to.
A magnetic encoder according to any preceding claim which comprises a rotary encoder of the kind in which the first track is located concentrically around the second track on a disk shaped encoder element, the poles of the first track extending to the edge of the disk to give a perimeter that at least partially extends around a circular path of radius r, and the fixing mechanism engages with one or more of the features that are provided at the outer perimeter of the disk.
Dependencies are inferred from the claim text.