Variable reluctance speed sensor of integral construction utiliz

Details Variable reluctance speed sensor of integral construction utiliz Variable reluctance speed sensor of integral construction utiliz

1976-03-08

1977-08-30

Rolinec, Rudolph V.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

335229, 335302, 324 42, G01P 348

Patent

active

040457389

ABSTRACT:
A compact, highly efficient, integral construction for a speed sensor is described which, in a preferred embodiment, utilizes a cup shaped magnetically soft body or housing as an integral core, sheath and flux return path for a rare earth permanent magnet. A reentrant center post is positioned within the cup shaped sensor housing and a thin disc shaped, rare earth permanent magnet is secured to the free end of the center post. The magnet is thus positioned directly adjacent to a rotating toothed gear, the speed of which is to be sensed but is shielded magnetically from extraneous magnetic effects because it is positioned in the housing. As the toothed wheel rotates past the magnet, the reluctance of the magnetic path varies with the varying air gap. The flux level generated by the thin magnet varies correspondingly and an AC signal is generated in a coil mounted on the center post. By positioning the high coercive force, rare earth magnet directly adjacent to the wheel and providing a direct return path from the wheel teeth to the sidewalls of the cup shaped housing the magnet, a very compact and efficient construction is made possible.

REFERENCES:
patent: 3633138 (1972-01-01), Baermann
patent: 3671893 (1972-06-01), Edgar et al.
patent: 3826985 (1974-07-01), Wiley
patent: 3881127 (1975-04-01), MacMaster et al.
patent: 3929519 (1975-12-01), Benz
Measurement of Magnetic Properties of Cobalt-Rare Earth Permanent Magnets, M. G. Benz & D. Luther Martin, IEEE Trans. on Magnetics, vol. Mag. 7, No. 2, June 1971, pp. 285-291.

Affiliated with

Also associated with

Rating

Variable reluctance speed sensor of integral construction utiliz does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Variable reluctance speed sensor of integral construction utiliz, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable reluctance speed sensor of integral construction utiliz will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-964478