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thanks my friends after reading a book "power calculation handbook" stationary battery I have found maybe a good thing : we can use the formula 0.2*C5 Amps where C5 is AH capacity of battery and we this we can find the cuurent of charging for 5 hours, is it true? thanks

hello I have a 110v battery charger, in first time it used for a 720 AH 110v battery , now I would change the battery by other type 110v 500 AH the charger is firstly configured in floating for the 110 v ,720 AH battery, my question is : can use this charger for the 110v 500AH without...

thanks electricpete your response is very helpful best regards

i think that the best question is: why ABB gives this induction motor data like this?, it's easy to calculate all parametres of motors if the parametres was given like what wehave study in school (paremetres in no load and blocked rotor)not in depend of temperature(my english is not well...

thanks a lot but what means by changing speed ,is the machine manufacturer make mistake about speed measured? regards

yes you are right in french couple means torque. the document in attachment is an official document from ABB the motor type is : AMDT 500-700 with directive atex , if we compare between this document and other induction machine guide books there is a named difference for the resistance and...

hello I have an 3 phases IM 5.5kv ,2450kw , 291 amps, Id/In=4.5, Td/Tn=0.3 , 50Hz, 2983tr/min when I calculate the current in full load with equivalent circuit(see attachment file ) i can't found 291 amps if i do a mistake? I don't know, can anyone give helpregards

hello in the aim to view the efficiency of induction motor variation with load variation i would know the formula of n(efficiency) and the P(power in shaft or load) to draw this curve example: for 10% 15% 20% 25% 30% 35%........OF P power what is the efficiency best regards

I MUST inform u that our hydraodynamic drive use the same motor and pump so there is not a more change and the effeciency may be still the same or better than a hv vfd ( our hydrodynamic fluid drive is vorecon from voith) regards

hello in pumping sation of oil we use a hydrodynamic fluid coupleur to change flow for pump and the driver is a HV motor (2.5 MW).so we would change the hydrodynamic coupleur by a HV variable fraquency driver. is it a good idea?and for annual energy cost witch the better? best regards