DEVICE FOR CONTROLLING DUAL-SPEED MOTOR OF BLOWER FAN

摘要

FIELD: electronic equipment.;SUBSTANCE: invention can be used in electric drives of boiler unit blow fans. Step-up control device is equipped with motor performance computing units (13), setting control range (14) and dead zone, and switching control circuits (15). Input of unit for calculating efficiency (13) is connected to output of sensor of second controlled parameter (12), mechanically connected to blower fan (2), and output to input of control range setting unit (14) and dead zone, output of which is connected to input of switching control (15), whose outputs are connected to control inputs of switching elements (7, 8). Power controlled keys are applied as switching elements (7, 8). Semiconductor voltage converter (5) power module is made in form of frequency converter. First (11) of controlled parameter is negative pressure in boiler furnace; second (12) of controlled parameter is forced draft fan air flow (1); boiler furnace negative pressure setting unit is used as command unit (10).;EFFECT: reduction of electric energy consumption due to increased equivalent electric drive efficiency of blow fan at preset process mode of boiler unit.;1 cl, 1 dwg