變頻器制動電阻選擇和計算方法(編輯修改稿)
2025-06-19 21:42 本頁面
【文章內(nèi)容簡介】 maximum motor speed, Rad/s ?o = a slower motor speed, Rad/s Copyright 169。 2021 Rockwell Automation, Inc. All rights reserved. Step 6 Percent Average Load Step 7 Percent Peak Load 1 00xPPALdbav?AL = Average Load in percent of Dynamic Brake Resistor Pav = Average dynamic brake resistor dissipation calculated in step 5, watts Pdb = Steady state power dissipation capacity of the selected dynamic brake module 1 00xPPPLdbb?PL = Peak Load in percent of Dynamic Brake Resistor Pav = Peak braking power calculated in step 2, watts Pdb = Steady state power dissipation capacity of the selected dynamic brake module Copyright 169。 2021 Rockwell Automation, Inc. All rights reserved. Step 8 Plot AL and PL on Curves 6001 0 7 . 5 4 4 3 9 3Pd3t( )100 . 5 t0 1 2 3 4 5 6 7 8 9 10100200300400500600K A , K B , K C T r a n s i e n t P o w e r C a p a c i t yT i m e , s e c o n d sPower, %Copyright 169。 2021 Rockwell Automation, Inc. All rights reserved. How to Select a Chopper Module and Dynamic Braking Resistor Copyright 169。 2021 Rockwell Automation, Inc. All rights reserved. Step 1 Total Inertia LmT xJGRJJ2??JT = total inertia reflected to the motor shaft, kilogrammeters2 (kgm2) or poundfeet2 (lbft2) Jm = motor inertia, kilogrammeters2 (kgm2) or poundfeet2 (lbft2) GR = the gear ratio for any gear between the motor and load, dimensionless. 2:1 = JL = load inertia, kilogrammeters2 (kgm2) or poundfeet2 (lbft2) Note: = kgm2 Copyright 169。 2021 Rockwell Automation, Inc. All rights reserved. Step 2 Peak Regenerative Power ? ?23 ttxJP obbTb??????JT = total inertia reflected to the motor shaft, kgm2 ?b = max angular rotational speed, Rad/s = 2pNb/60 ?o = angular rotational speed, less than rated speed (can be zero) Rad/s Nb = maximum application speed in RPM t3t2 = total time of deceleration from ?b to ?o, seconds Pb = peak braking power, watts Note: HP = 746 watts Copyright 169。 2021 Rockwell Automation, Inc. All rights reserved. Step 3 Maximum DB Resistor Value bddbPVR21 ?Vd = the value of DC Bus voltage that the chopper module regulates at. This value will be 375VDC or 750VDC or Pb = peak braking power calculated in step 2 Rdb1 = the maximum allowable value for the dynamic brake resistor Resistor tolerances could be built in here. +/ 10% Copyright 169。 202
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