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  1. Takhinen

    variable speed efficiency

    Thanks Alehman, It is not a general question ,Lets think that we need for example 10 kW power to be used for (X) load on the output of an AC motor , with efficiency 0.83. in this case your calculation will lead you to have 12 kW , (or 13,3 KVA if the motors cos f =0.9 ) power on the input of...
  2. Takhinen

    variable speed efficiency

    Hi, I am wondering if there is any study showing the AC drive chain efficiency? Lets assume that we have the following AC Drives parts: EMC filter , Frequency converter PWM type ,Output Filter ( for example - sine wave former) , long cables,AC motor , load So , what is the losses ( approx. in...
  3. Takhinen

    Switch Circuit Drive

    Thanks Gunnar ! yes , i went to the link http://www.nfodrives.se/ and red about the patents.I hope to find more therotical information whith details about max power rating of the Switch Circuit Inverter (SWI)and the way or modulation to form the output sinusoidal signals ( voltage & current)...
  4. Takhinen

    Switch Circuit Drive

    Hi ! What is the difference between PWM inverter and Switch circuit(SC) inverter ? Where can i find information about switch circuit(SC) patent and its possibility to be used in VSD? Seems to be that switch circuit inverter is more progressive than that one uses PWM , but how to form output...

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