GEAR TESTING SPEED OF ROTATION OF SHAFT Russian patent published in 1997 - IPC

FIELD: measurement technology, automatic disconnection of electric motor drives of technological plants. SUBSTANCE: gear testing speed of rotation of shaft includes disc joined to shaft of tested machine having perforation in the form of slots and protrusions evenly arranged over its circumference, two transducers put on side of perforation of disc, actuating mechanism, two level formers, two resistors connecting output of proper level former to power supply source two RC networks, two discs shunting resistors of RC networks, coincidence circuit and third level former. Each transducer is coupled to input of corresponding level former, resistors of RC networks are connected to outputs of level formers. Points of contact of resistors with capacitors of RC networks are connected to inputs of coincidence circuit which output is connected to input of third level former which output is coupled to actuating mechanism. Alternating forced charge and slowed-down discharge of capacitors of RC networks take place during operation of gear. Coincidence circuit controls level of potentials of capacitors and fall of potential across one of capacitors to low level related to increase of period of discharge with deceleration of speed of rotation of shaft causes change of signal across output of mentioned circuit and operation of third level former sending command into actuating mechanism. EFFECT: expanded functional capabilities, diminished mass and size characteristics. 1 dwg