Magnetic position measuring device using a plurality of sensors and a scale
First Claim
1. A magnetic positioning measuring device comprising a sensor and a scale, at least one of said sensor and said scale being movable in relation to the other of said sensor and said scale, said sensor comprising four sensor elements positioned along a longitudinal axis parallel to a direction of said movement, said scale comprising alternating and repeating first and second sections, said first sections having a first reluctance and said second sections having a second reluctance, said first sections each having a length "l" along said longitudinal axis and said second sections each having a length "s" along said longitudinal axis;
- said sensor comprising a field plate and said four sensor elements positioned on said field plate along said longitudinal axis, said four sensor elements comprising first and second outer sensor elements and first and second inner sensor elements, said first outer sensor element being closer to said first inner sensor element than said second outer sensor element, and said second outer sensor element being closer to said second inner sensor element than said first sensor element;
each of said four sensor elements comprising a first edge facing a first direction along said longitudinal axis and a second edge facing a second direction opposite said first direction along said longitudinal axis, positions of said four sensors along said longitudinal axis being defined as follows;
d1 =d3 =(2k+1)p/2, andd2 =kp-p/4 wherein k is one of a positive integer and zero, p=s+l is the pitch of said scale, d1 is a distance between said first edge of said first outer sensor element and said first edge of said first inner sensor element, d3 is a distance between said first edge of said second outer sensor element and said first edge of said second inner sensor element, and d2 is a distance between respective said first edges of said first and second inner sensor elements.
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Accused Products
Abstract
A magnetic position measuring device includes a sensor and a scale. At least one of the sensor and scale is movable in relation to the other. The sensor includes four sensor elements positioned along a longitudinal axis parallel to the direction of the movement. The scale is made of alternating and repeating first and second sections. The first sections have a first reluctance and the second sections have a second reluctance. The first sections each have a length "l" and the second sections each have a length "s". The Sensor includes a field plate and four sensor elements positioned on the field plate along the longitudinal axis. The four sensor elements include first and second outer sensor elements and first and second inner sensor elements.
26 Citations
12 Claims
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1. A magnetic positioning measuring device comprising a sensor and a scale, at least one of said sensor and said scale being movable in relation to the other of said sensor and said scale, said sensor comprising four sensor elements positioned along a longitudinal axis parallel to a direction of said movement, said scale comprising alternating and repeating first and second sections, said first sections having a first reluctance and said second sections having a second reluctance, said first sections each having a length "l" along said longitudinal axis and said second sections each having a length "s" along said longitudinal axis;
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said sensor comprising a field plate and said four sensor elements positioned on said field plate along said longitudinal axis, said four sensor elements comprising first and second outer sensor elements and first and second inner sensor elements, said first outer sensor element being closer to said first inner sensor element than said second outer sensor element, and said second outer sensor element being closer to said second inner sensor element than said first sensor element; each of said four sensor elements comprising a first edge facing a first direction along said longitudinal axis and a second edge facing a second direction opposite said first direction along said longitudinal axis, positions of said four sensors along said longitudinal axis being defined as follows; d1 =d3 =(2k+1)p/2, and d2 =kp-p/4 wherein k is one of a positive integer and zero, p=s+l is the pitch of said scale, d1 is a distance between said first edge of said first outer sensor element and said first edge of said first inner sensor element, d3 is a distance between said first edge of said second outer sensor element and said first edge of said second inner sensor element, and d2 is a distance between respective said first edges of said first and second inner sensor elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification