PICKUP OF ROTATIONAL SPEED Russian patent published in 1994 - IPC

FIELD: measurement technology. SUBSTANCE: pickup of rotational speed has body, cover and rotor. Body is produced in the form of hollow sleeve. Cylinder with longitudinal through duct is connected to outer surface of sleeve bottom. Pole element which end carries permanent magnet is mounted on inner surface of bottom. The other end of element is provided with hole embracing bushing pressed into duct. Rotor which sprocket is located in space of sleeve is installed with its shaft into bushing. Cover is manufactured in the form of disc produced from insulation material. Its outer side has block of contact terminals. Back side of disc facing space of sleeve has block installed in parallel to sleeve plane which includes terminals, board with electron elements, concentrator of magnetic flux and magnetosensitive element. Concentrator is placed between board and magnetosensitive element. When pickup is assembled its shaft borders on plane of concentrator at right angle. Concentrator closes magnetic circuit between shaft and magnetosensitive element. In this case tabs of sprocket extend into clearance between magnet and magnetosensitive element. Interrelation of elements of structure and magnetic circuit allow dimensions and mass of pickup to be reduced. EFFECT: reduced dimensions and mass of pickup. 3 cl, 3 dwg