Device for generating electrical pulses in response to shaft rotation
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKiyoshi Hashimoto, Shigeki Kitamura
Life of this patent
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Abstract
Two yokes of magnetic material are fixedly attached to opposite axial ends of a magnet which is revolvable about its axis with a revolving shaft, an alternating magnetic field generator is positioned in the magnetic field between the two yokes to generate alternating magnetic field with revolution of the shaft, and a magnetoelectric transducer is provided in the alternating field in order to generate a pulsating electrical signal indicative of the number of the shaft revolutions.
Claims27
A device for generating electrical pulses each time a shaft turns a revolution, which device comprises:
- a magnet having a longitudinal axis and axially magnetized, and secured to said shaft in such a manner as to be revolvable about the axis;
- two yokes, each made of magnetic material and having a plurality of blades, said two yokes being fixedly attached to opposite axial ends of said magnet, respectively, and arranged such that each of the blades of one of said two yokes axially faces a space between two blades of the other yoke;
- means for coupling an alternating magnetic field between said yokes in an axial direction with revolution of said magnet, which means is provided in the magnetic field between said yokes and includes two rod-like members, said two rod-like members being arranged in parallel to each other and positioned in parallel to said axis and in the vicinity of said yokes such that, when one of the two members faces one of the blades of one of said two yokes, the other member faces one of the blades of the other yoke;
- and
- a magnetoelectric transducer magnetically coupled to said means in a manner as to be between the two rod-like members of said means for generating said electrical pulses due to said alternating magnetic field.
A device for generating electrical pulses each time a shaft turns a revolution, which device comprises:
- a magnet having a longitudinal axis and axially magnetized, and secured to said shaft in such a manner as to be revolvable about the axis;
- two yokes, each made of magnetic material and having a plurality of blades, said two yokes being fixedly attached to opposite axial ends of said magnet, respectively, and arranged such that each of the blades of one of said two yokes axially faces each of the blades of the other yoke;
- means for coupling an alternating magnetic field between said yokes in an axial direction with revolution of said magnet, which means is provided in the magnetic field between said two yokes and includes two rod-like members, and said two rod-like members being arranged to cross each other and positioned in the vicinity of said yokes, such that, when one of the two members faces one of the blades of one of said two yokes, the other member faces one of the blades of the other yoke;
- and
- a magnetoelectric transducer magnetically coupled to said means in a manner as to be between the two rod-like members of said means for generating said electrical pulses due to said alternating magnetic field.
A device for generating electrical pulses each time a shaft turns a revolution, which device comprises:
- a magnet having a longitudinal axis and axially magnetized, and secured to said shaft in such a manner as to be revolvable about the axis;
- two yokes, each made of magnetic material and having a plurality of blades, said two yokes being fixedly attached to opposite axial ends of said magnet, respectively, and arranged such that each of the blades of one of said two yokes axially faces each of the blades of the other yoke;
- means for coupling an alternating magnetic field between said yokes in an axial direction with revolution of said magnet, which means is provided in the magnetic field between said two yokes and includes two rod-like members, said two rod-like members being arranged in parallel to each other and positioned to cross with said axis of said magnet such that, when one of the two members faces one of the blades of one of said two yokes, the other member faces one of the blades of the other yoke;
- and
- a magnetoelectric transducer magnetically coupled to said means in a manner as to be between the two rod-like members of said means for generating said electrical pulses due to said alternating magnetic field.
A device for generating electrical pulses each time a shaft turns a revolution, which shaft revolves in synchrionism with running of an internal combustion engine, and which device comprises:
- a magnet having a longitudinal axis and axially magnetized, and secured to said shaft in such a manner as to be revolvable about the axis;
- two yokes, each made of magnetic material and having a plurality of blades, the number of the blades of each of said two yokes being the same as the number of cylinders of said internal combustion engine, said two yokes being fixedly attached to opposite axial ends of said magnet, respectively, and arranged such that each of the blades of one of said two yokes axially faces a space between two blades of the other yoke;
- means for coupling an alternating magnetic field between said yokes in an axial direction with revolution of said magnet, which means is provided in the magnetic field between said two yokes and includes two rod-like members, said two rod-like members being arranged in parallel to each other and positioned in parallel to said axis and in the vicinity of said yokes such that, when one of the two members faces one of the blades of one of said two yokes, the other member faces one of the blades of the other yoke;
- and
- a magnetoelectric transducer magnetically coupled to said means in a manner as to be between the two rod-like members of said means for generating said electrical pulses due to said alternating magnetic field.
A device for generating electrical pulses each time a shaft turns a revolution, which shaft revolves in synchronism with running of an internal combustion engine, and which device comprises:
- a magnet having a longitudinal axis and axially magnetized, and secured to said shaft in such a manner as to be revolvable about the axis;
- two yokes, each made of magnetic material and having a plurality of blades, the number of the blades of each of said two yokes being the same as the number of cylinders of said internal combustion engine, said two yokes being fixedly attached to opposite axial ends of said magnet, respectively, and arranged such that each of the blades of one of said two yokes faces each of the blades of the other yoke;
- means for coupling an alternating magnetic field between said yokes with revolution of said magnet, which means is provided in the magnetic field between said two yokes and includes two rod-like members, said two rod-like members being arranged to cross each other and positioned in the vicinity of said yokes such that, when one of the two members axially faces one of the blades of one of said two yokes, the other member axially faces one of the blades of the other yoke;
- and
- a magnetoelectric transducer magnetically coupled to said means in a manner as to be between the two rod-like members of said means for generating said electrical pulses due to said alternating magnetic field.
A device for generating electrical pulses each time a shaft turns a revolution, which shaft revolves in synchronism with running of an internal combustion engine, and which device comprises:
- a magnet having a longitudinal axis and axially magnetized, and secured to said shaft in such a manner as to be revolvable about the axis;
- two yokes, each made of magnetic material and having a plurality of blades, said two yokes being fixedly attached to opposite axial ends of said magnet, respectively, and arranged such that each of the blades of one of said two yokes axially faces each of the blades of the other yoke;
- means for coupling an alternating magnetic field between said yokes in an axial direction with revolution of said magnet, which means is provided in the magnetic field between said two yokes and includes two rod-like members, said two rod-like members being arranged in parallel to each other and positioned to cross with said axis of said magnet such that, when one of the two members faces one of the blades of one of said two yokes, the other member faces one of the blades of the other yoke;
- and
- a magnetoelectric transducer magnetically coupled to said means in a manner as to be between the two rod-like members of said means for generating said electrical pulses due to said alternating magnetic field.
A device for generating an electrical signal in response to a shaft rotating comprising a pair of yokes adapted to be fixedly mounted at axially spaced locations along the shaft, means for magnetically polarizing the yokes so that one of the yokes has only a first magnetic polarity and the other yoke has only a second magnetic polarity, each of said yokes including radially extending pole face segments between which high reluctance segmented regions are formed, means for establishing a low reluctance magnetic axial path between a segment of one of said yokes and a segment of the other yoke while the yokes are in a first arcuate position so that magnetic flux flows in a first direction through a portion of the low reluctance path while the yokes are in the first position and for establishing the low reluctance path between a segment of said one yoke and a segment of said other yoke while the yokes are in a second arcuate position so that the magnetic flux flows in the opposite direction through said portion of the low reluctance path while the yokes are in the second arcuate position, said means for establishing the low reluctance magnetic path being stationary relative to the discs, and means in said portion for deriving an electric signal in response to the magnetic flux flowing through said portion.
Dependencies are inferred from the claim text.