Moving body speed detecting device which produces and detects a magnetic pole on the body surface
First Claim
1. A device for detecting a speed of movement of a moving body, a speed of which is to be measured, having a surface made of a magnetic material, comprising:
- magnetizing means, disposed in the vicinity of said moving body, for forming a point magnetic pole on a surface of the moving body to move therewith,magnetic field detecting means, provided adjacent to said moving body, for detecting a magnetic field of the magnetic pole formed on said surface by said magnetizing means, and producing a voltage in accordance with a variation of said magnetic field caused by the movement of said moving body, both said magnetizing means and said magnetic field detecting means being spaced from said moving body on a same straight line extending in a direction perpendicular to a direction of movement of said moving body; and
output signal processing means for processing a signal output by said magnetic field detecting means for determining the speed of movement of said moving body.
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Abstract
According to this invention, a device for detecting the speed of transference of a moving body, having a construction such that the device comprises a magnetizing element for forming a magnetic pole on a surface of a moving body made of a magnetic material and disposed in the vicinity of the moving body, a magnetic field detecting circuit provided adjacent to the moving body, for linking therewith the magnetic field of the magnetic pole formed by the magnetizing element and for outputting an electrical voltage in accordance with a variation of the magnetic field caused by the transference of the moving body, and an output signal processing circuit for processing a signal output by the magnetic field detecting circuit and for determining the speed of transference of the moving body can be obtained, and by utilizing the device mentioned above, an effect whereby a signal corresponding to the displacement speed of a moving body is continuously obtained and therefore, a moving body need not be precisely fabricated with a specific configuration such as forming concave and convex portions on the surface of the moving body, and moreover, to continuously obtain precise information about the speed of the moving body, because even when the moving body moves at an extremely low speed, an increment of a ripple and a phase shift can not occur, can be realized.
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Citations
13 Claims
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1. A device for detecting a speed of movement of a moving body, a speed of which is to be measured, having a surface made of a magnetic material, comprising:
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magnetizing means, disposed in the vicinity of said moving body, for forming a point magnetic pole on a surface of the moving body to move therewith, magnetic field detecting means, provided adjacent to said moving body, for detecting a magnetic field of the magnetic pole formed on said surface by said magnetizing means, and producing a voltage in accordance with a variation of said magnetic field caused by the movement of said moving body, both said magnetizing means and said magnetic field detecting means being spaced from said moving body on a same straight line extending in a direction perpendicular to a direction of movement of said moving body; and output signal processing means for processing a signal output by said magnetic field detecting means for determining the speed of movement of said moving body. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 13)
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2. A device for detecting a speed of movement of a moving body, a speed of which is to be measured, having a surface made of a magnetic material, comprising:
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magnetizing means, disposed in the vicinity of said moving body, for forming a point magnetic pole on the surface of the moving body to move therewith, magnetic field detecting means, provided adjacent to said moving body, for detecting a magnetic field of the magnetic pole formed on said surface by said magnetizing means and for outputting a voltage in accordance with a variation of said magnetic field caused by the movement of said moving body; and output signal processing means for processing a signal output by said magnetic field detecting means and for determining the speed of movement of said moving body, both said magnetizing means and said magnetic field detecting means being spaced from said moving body on a same straight line extending in a direction perpendicular to a direction of movement of said moving body; and said output signal processing means further including means for detecting a time when said magnetic pole is formed by said magnetizing means and detecting a speed of movement of said moving body from a time after said detected time at which said magnetic pole is formed until a time when said voltage generated by said magnetic field detecting means reaches a predetermined value.
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3. A device for detecting a speed of movement of a moving body, a speed of which is to be measured, having a surface made of a magnetic material, comprising:
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magnetizing means disposed in the vicinity of said moving body for forming a point magnetic pole on the surface of the moving body to move therewith; magnetic field detecting means provided adjacent to said moving body, for detecting a magnetic field of the magnetic pole formed on said surface by said magnetizing means and for outputting a voltage in accordance with a variation of said magnetic field caused by the movement of said moving body, both said magnetizing means and said magnetic field detecting means being spaced from said moving body on a same straight line extending in a direction perpendicular to a direction of movement of said moving body; and output signal processing means for processing a signal output by said magnetic field detecting means for determining a speed of movement of said moving body, said magnetizing means further comprising a demagnetizing means for forcibly eliminating, after said determining, said magnetic pole formed on the surface of said moving body.
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12. A device for detecting a speed of movement of a moving body, a speed of which is to be measured, having a surface made of a magnetic material comprising:
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magnetizing means disposed in the vicinity of said moving body, for forming a point magnetic pole on the surface of the moving body to move therewith; magnetic field detecting means, provided adjacent to said moving body, for detecting a magnetic field of the magnetic pole formed on said surface by said magnetizing means and outputting an voltage in accordance with a variation of said magnetic field caused by the movement of said moving body, both said magnetizing means and said magnetic field detection means being spaced from said moving body on a same straight line extending in a direction perpendicular to a direction of movement of said moving body; and output signal processing means for processing a signal output by said magnetic field detecting means and for determining a direction of movement of said moving body in accordance with a polarity of the output voltage of said magnetic field detecting means.
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Specification