Electricity: motive power systems – Linear-movement motors
Patent
1997-03-31
1998-05-05
Stephan, Steven L.
Electricity: motive power systems
Linear-movement motors
310 12, H02K 4100
Patent
active
057479526
ABSTRACT:
A linear motor apparatus includes a stator extending in a predetermined direction and having a field magnet for driving; a movable piece having an armature coil opposed to the field magnet, and being reciprocatable along the stator; a Hall element disposed at a portion on the movable piece opposed to the field magnet for outputting a voltage signal depending on an intensity and a direction of a magnetic field formed by the field magnet as well as a Hall element reference input voltage supplied thereto; a correction circuit for producing an output signal by correcting an output signal issued from the Hall element to have a cycle equal to that of the Hall element output signal and a constant maximum amplitude depending on the Hall element reference input voltage; and a current supply circuit for supplying a current, depending on the output voltage issued from the correction circuit, to the armature coil for producing a driving force of the movable piece.
REFERENCES:
patent: 4436416 (1984-03-01), Negoro et al.
patent: 4837467 (1989-06-01), Newman
patent: 5081381 (1992-01-01), Narasaki
patent: 5493188 (1996-02-01), Yoshikawa et al.
Izawa Makoto
Nanba Katsuhiro
Jones Judson H.
Minolta Co. , Ltd.
Stephan Steven L.
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