Sensor device for an electric machine
First Claim
1. A sensor device for detecting a position or a movement relative to a machine component of an electric machine having pole teeth, the sensor comprising:
- a U-shaped yoke section having opposing free ends, anda sensor arranged in or on the yoke section for measuring a magnetic variable, andtwo magnets having opposite polarity arranged on each of the opposing free ends of the yoke section, with a magnet of one polarity disposed on one end of the yoke section in cooperation with a magnet of opposite polarity on the other end of the yoke section producing in the yoke section a magnetic flux depending on a position of the two magnets in relation to an opposing pole tooth, with a flux direction in the yoke section depending on the polarity of the two cooperating magnets that oppose the opposing pole teeth.
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Accused Products
Abstract
The aim of the invention is to create an inexpensive sensor system for a movable electric machine in order to determine positions, the sensor signal featuring zero crossings. Said aim is achieved by a sensor device (1) comprising a U-shaped yoke (3) and a sensor (10) which is disposed in/on the yoke (3) to detect a magnetic variable, for example. Magnets (6 to 9) that are or can be inversely magnetized are arranged at a free end of the yoke (3). Opposite magnetic fluxes that can be detected by the sensor (10) can be generated in the yoke (3) in accordance with the position of the magnets (6 to 9) relative to one of the pole teeth (11, 12, 13) of a machine component. Approximately sinusoidal sensor signals can be generated therefrom without having to use several measuring sensors, e.g. in order to regulate a linear motor.
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Citations
22 Claims
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1. A sensor device for detecting a position or a movement relative to a machine component of an electric machine having pole teeth, the sensor comprising:
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a U-shaped yoke section having opposing free ends, and a sensor arranged in or on the yoke section for measuring a magnetic variable, and two magnets having opposite polarity arranged on each of the opposing free ends of the yoke section, with a magnet of one polarity disposed on one end of the yoke section in cooperation with a magnet of opposite polarity on the other end of the yoke section producing in the yoke section a magnetic flux depending on a position of the two magnets in relation to an opposing pole tooth, with a flux direction in the yoke section depending on the polarity of the two cooperating magnets that oppose the opposing pole teeth. - View Dependent Claims (2, 3, 4, 7)
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5. A sensor device for detecting a position or a movement relative to a machine component of an electric machine having pole teeth, the sensor comprising:
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a U-shaped yoke section having opposing free ends and an additional center limb integrally formed on the yoke section, thereby producing an E-shaped yoke section, a sensor arranged in or on the yoke section for measuring a magnetic variable, and two magnets having opposite polarity arranged on the additional center limb of the yoke section and producing in the yoke section a magnetic flux depending on a position of the two magnets in relation to an opposing pole tooth, with a flux direction in the yoke section depending on the polarity of the magnet that opposes the pole tooth. - View Dependent Claims (6)
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8. A sensor device for detecting a position or a movement relative to a machine component of an electric machine having pole teeth, the sensor comprising:
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a U-shaped yoke section having opposing free ends, and a magnet device arranged in or on the yoke section for producing in the yoke section a magnetic flux having a flux direction, and a sensor having two sensor elements arranged on each of the opposing free ends of the yoke section for measuring a magnetic variable, wherein a sensor element disposed on one end of the yoke section in cooperation with a sensor element disposed on the other end of the yoke section produce for a given magnetic flux direction in the yoke section voltages of different polarity in the cooperating sensor elements, with a magnitude of the produced voltages depending on a position of the cooperating sensor elements in relation to an opposing pole tooth. - View Dependent Claims (9, 10, 11, 12)
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13. A sensor device for detecting a position or a movement relative to a machine component of an electric machine having pole teeth, the sensor comprising:
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an E-shaped yoke having center limb and being symmetrically split along the center limb into two yoke parts transversely to a movement direction, with an air gap separating the two yoke parts, a sensor arranged in the air gap of the center limb for measuring a magnetic variable, and a magnet bridging free ends of the two yoke parts of the center limb. - View Dependent Claims (14, 15, 16)
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17. An electric machine comprising a sensor device for detecting a position or a movement relative to a machine component of the electric machine having pole teeth, the sensor comprising:
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a U-shaped yoke section having opposing free ends, and a sensor arranged in or on the yoke section for measuring a magnetic variable, and two magnets having opposite polarity arranged on each of the opposing free ends of the yoke section, with a magnet of one polarity disposed on one end of the yoke section in cooperation with a magnet of opposite polarity on the other end of the yoke section producing in the yoke section a magnetic flux depending on a position of the two magnets in relation to an opposing pole tooth, with a flux direction in the yoke section depending on the polarity of the two cooperating magnets that oppose the opposing pole teeth. - View Dependent Claims (18)
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19. An electric machine comprising a sensor device for detecting a position or a movement relative to a machine component of an electric machine having pole teeth, the sensor comprising:
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a U-shaped yoke section having opposing free ends, and a magnet device arranged in or on the yoke section for producing in the yoke section a magnetic flux having a flux direction, and a sensor having two sensor elements arranged on each of the opposing free ends of the yoke section for measuring a magnetic variable, wherein a sensor element disposed on one end of the yoke section in cooperation with a sensor element disposed on the other end of the yoke section produce for a given magnetic flux direction in the yoke section voltages of different polarity in the cooperating sensor elements, with a magnitude of the produced voltages depending on a position of the cooperating sensor elements in relation to an opposing pole tooth. - View Dependent Claims (20)
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21. An electric machine comprising a sensor device for detecting a position or a movement relative to a machine component of an electric machine having pole teeth, the sensor comprising:
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an E-shaped yoke having center limb and being symmetrically split along the center limb into two yoke parts transversely to a movement direction, with an air gap separating the two yoke parts, a sensor arranged in the air gap of the center limb for measuring a magnetic variable, and a magnet bridging free ends of the two yoke parts of the center limb. - View Dependent Claims (22)
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Specification