Magnetic position measuring device using Hall elements as sensors and method for its operation
First Claim
1. A magnetic position measuring device for determining the relative position of two objects which are movable with respect to each other, wherein a magnetic graduation is scanned by at least two Hall elements, each of the Hall elements generates, position-dependent, periodic output signal when the graduation is scanned by the two Hall elements, wherein the Hall elements each have at least one supply voltage and one measuring voltage connector, the device comprising:
- at least one switching unit which periodically interchanges the supply voltage and measuring voltage connectors of each Hall element with each other; and
at least one synchronization unit which passes synchronization signals to the switching unit so that the periodic interchange of the supply voltage and the measuring voltage of one of said Hall elements is performed synchronously with respect to the other of said Hall elements so that said position-dependent periodic output signals have a phase shift of 90°
with respect to each other.
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Accused Products
Abstract
In a magnetic position measuring device for determining the relative position of two objects which can be moved with respect to each other, a magnetic graduation is scanned by at least two Hall elements for the generation of position-dependent output signals. The Hall elements respectively have at least one supply voltage and one measuring voltage connector. Furthermore, at least one switching unit is provided, which periodically interchanges the supply voltage and the measuring voltage connectors of each Hall element with each other. The periodic interchange of the supply voltage and measuring voltage connectors of the various Hall elements with each other is furthermore synchronized by means of at least one synchronization unit.
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Citations
12 Claims
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1. A magnetic position measuring device for determining the relative position of two objects which are movable with respect to each other, wherein a magnetic graduation is scanned by at least two Hall elements, each of the Hall elements generates, position-dependent, periodic output signal when the graduation is scanned by the two Hall elements, wherein the Hall elements each have at least one supply voltage and one measuring voltage connector, the device comprising:
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at least one switching unit which periodically interchanges the supply voltage and measuring voltage connectors of each Hall element with each other; and at least one synchronization unit which passes synchronization signals to the switching unit so that the periodic interchange of the supply voltage and the measuring voltage of one of said Hall elements is performed synchronously with respect to the other of said Hall elements so that said position-dependent periodic output signals have a phase shift of 90°
with respect to each other. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for operating a magnetic position measuring device for determining the relative position of two objects which are movable with respect to each other, the method comprising the steps of:
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providing a magnetic graduation; providing at least two Hall elements, each Hall element having a supply and measuring voltage; scanning the magnetic graduation with the at least two Hall elements and generating a periodic position-dependent output signal with each of the two Hall elements; providing a switching unit for periodically interchanging the supply and measuring voltages of each Hall sensor; and providing a synchronization unit that passes synchronization signals to the switching unit so that the periodic interchange of the supply voltage and the measuring voltage of one of said Hall elements is performed synchronously with respect to the other of said Hall elements so that said position-dependent periodic output signals have a phase shift of 90°
with respect to each other. - View Dependent Claims (9, 10, 11)
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12. A magnetic position measuring device for determining the relative position of two objects which are movable with respect to each other, wherein a magnetic graduation is scanned by at least two Hall elements for generating position-dependent output signals, wherein the Hall elements each have at least one supply voltage and one measuring voltage connector, the device comprising:
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at least one switching unit which periodically interchanges the supply voltage and measuring voltage connectors of each Hall element with each other; at least one synchronization unit which synchronizes the periodic interchange of the supply voltage and measuring voltage connectors of the different Hall elements with each other; and an oscillator unit assigned to the synchronization unit which provides a periodic clock signal which determines the switching frequency.
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Specification