ROTATION DRIVE OF WORKING ORGAN TO APPARATUS AND METHOD FOR TREATING FOOD PRODUCTS Russian patent published in 2005 - IPC

FIELD: magnetic drive unit designed for transmitting rotation from rotation motion source to closed space without direct mechanical link.

SUBSTANCE: drive unit of rotating working organ mounted in closed housing, namely of impeller mounted on shaft in cup of blender or in apparatus for preparing ice chips includes relatively thin round driving plate of magnetized material having poles along its circumference, arranged in housing and mounted in driving shaft. DC brushless motor mounted on base separated from housing includes rotor in the form of set of segment-like permanent magnet zones engaging with electronically controlled rotary electromagnetic field created by means of rings of stator windings. Second similar permanent magnet is mounted for coaxial rotation together with rotor and it has opposite polarity poles arranged in the same level one near another. Steel disc is clamped between magnet of rotor and second permanent magnet and it is joined with them. Magnetic field (flux lines) of second magnet passes along axis from rotor for inducing magnetic poles of opposite polarity in driving plate. Said second magnetic connection of magnets with plate uses adjacent gap restricted by lower wall of base, upper wall of housing and air gap between said walls and plate and second magnet. Gearing unit may be joined with driving shaft for increasing or decreasing torque transmitted from driving plate to working organ.

EFFECT: enhanced reliability of transmitting rotation at controlled rate to member with rotary drive separated from moving force source.

45 cl, 9 dwg