DC驱动基本知识.ppt

DC 驱动基础 E.g. ABB DC motors are rated with continuous current. In addition they can take an cyclic overload of 180 % for 20 s every 30 minutes The converter has to be dimensioned according to the “real” load (current) of the application not according to the rated current of the motor not according to the maximum current of the motor This is done by means of customized duty cycles using DriveSize Thank You for Your attention! ? ABB APR/AWV - * DCS800 DC Drive basics ? ABB APR/AWV - * DCS800 DC Drive basics DCS800 Thomas Vinz DCS800built on DCS technology DC Drives basics - General layout MV进线 MV/LV 变压器 励磁变压器 励磁熔断器 励磁接触器 励磁变流器 励磁绕组 AC-断路器 半导体熔断器 进线电抗器 电枢变流器 DC熔断器 DC 电机 电路原理图: ? 电机 变流器 = Id Udiα ? cos? M DC Drives basics - Armature converter 3 ? AC 电网 进线电抗器 DC 电压 DC 电流 AC 进线电流 Usupply 6-pulse thyristor bridge (line commutated) 可控电压源 (触发角 a) Output voltage can be positive or negative 电压源特性: Udiα a ? = 90° 1 3 5 4 6 2 EMK Udiα Id iL UL ~ ~ ~ Udiα ? cos? The convention for a Cartesian coordinate system is:(该公约为一个笛卡尔坐标系统) The 1st quadrant is on the top right(第一象限最上面的是正确的) All other numbers follow counterclockwise(所有其他数据按照逆时针方向) : Thus follows II I III IV Y X DC Drives basics – Quadrants (直流驱动器基础——象限) 0 0 0 0 y-coordinate 0 0 0 0 x-coordinate IV III II I Quadrant II Active braking I Driving III Driving IV Braking Speed (voltage) Torque (current) Typical applications: Extruder Mixer Rod and bar mills M UD? ID DC Drives basics - Single bridge (2-Q) Speed in one direction only, opposite speed direction is not possible! Negative current is not possible! Active braking is not possible! DC Drives basics - Double bridge (4-Q) II Active braking I Driving III Driving IV Braking Speed (voltage) Torque (current) Typical applications: Ski lifts Test rigs For smooth and fast torque reversal M UD? ID Speed in both directions is possible! Negative current is possible! Active braking is possible! DC Drives basics - Example double brid