North American Philips Corporation

Matthew L Schneider

Paul E Payne

Hermann Rosshirt

Eugene R Bishop

Ronald E Carr

An elongated generally cylindrical speed sensing device for sensing the speed of a toothed wheel to one side of the device, the device axis being transverse to the wheel axis and the device being generally tangential to the wheel. An elongated soft magnetic pole piece is surrounded by a coil coaxial with the pole piece, and a laterally extending circular symmetrical pole piece projection extends past an end of the coil to a diameter at least equal to the outside diameter of the coil. An axially magnetized permanent magnet abuts one end of the elongated pole piece. The device housing has rotationally symmetrical mounting surfaces coaxial with the magnetic axis so that angular alignment in installation is not required.

Side-looking speed sensor

A non-oriented direct coupled sensor for gear teeth or similarly shaped discontinuities of a ferrous magnetic or magnetic target uses a single magnet and a direct coupled Hall cell integrated circuit to detect the presence or absence of gear teeth. The sensor incorporates techniques for flux steering and flux reversals independent of the orientation of the sensor to the target to overcome the operate or release point of a Hall switch, latch or other device. The use of spaced apart, offset flux concentrators provides a sensitive device with favorable tolerances in temperature and air gap.

Growing community of inventors

Margate, FL, United States of America

Matthew L Schneider