METHOD OF AND DEVICE TO CONTROL DC ELECTRIC DRIVE OF SINGLE BUCKET EXCAVATOR Russian patent published in 2005 - IPC

FIELD: earth moving equipment; mining industry.

SUBSTANCE: invention relates to control of dc electric drive of main mechanisms of single-bucket excavator and it can be used in other dc drives of mining machines and mechanisms operating at low temperatures and wind loads. Method comes to control motor stopping by control of field current simultaneously and in inverse proportion to value of motor setting speed. Control of motor speed as a function of complex parameter taking in account level of negative temperature of machine metal, wind load and speed of change of these values, is also carried out. Device for implementing the method contains additionally motor field current setter mechanism, motor field current regulator whose output is connected with motor field current source, motor field current weakening setter whose input is connected with output of master controller, and output, with second input of field current regulator. First input of motor field current regulator is connected to output of motor maximum field current setter. Shaper of complex signal taking into account negative temperature of metal of machine, wind load and speed of change of said values is connected with second input of emf regulator.

EFFECT: reduced dynamic loads at starting, reversing and stopping, improved conditions of excavator bucket filling at digging.

3 cl, 5 dwg