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Valentin Angelovski
11/30/05 16:26
Read: 624 times
Melbourne
Australia


 
#104460 - Not in every case
Responding to: Erik Malund's previous message
Erik,

Leroy-somer, ( http://www.leroy-somer.com/uk/produits.html ) for example specify >50% overspeed - provided you have forced-ventilation fan externally mounted on the motor's rear. So double base frequency is indeed possible (we have done it successfuly many times) - not running the motor at maximum power (upsizing) also helps in this regard. Chances are, a Baldor Sales Engineer could also propose a greater than 20% overspeed solution using their motors...

One thing I will agree though, the performance/price ratio of Variable Speed Drives (VSD's) Has become so good that you can nowadays run 'specially re-constructed' AC motors to around 700 Hz synchronous speed(!) - all with the same 'off-the-shelf' AC motor controller(!!). Those IGBT's would be switching pretty fast in order to maintain <1% THD...

Valentin

List of 14 messages in thread
TopicAuthorDate
ac drive      Shashikant Sharma      11/05/05 01:39      
   How to select      Andy Neil      11/05/05 07:32      
   Speed sensor      Andy Neil      11/05/05 07:36      
      Re: ac drive      Valentin Angelovski      11/05/05 23:25      
   AC drives (inverters)      Erik Malund      11/07/05 07:03      
       AC Drive- Can you help?      Anil Gupta      11/30/05 03:49      
         ABB, Siemens      Andy Neil      11/30/05 04:25      
         No, I have not been involved in inverter      Erik Malund      11/30/05 05:58      
            When & which make?      Anil Gupta      11/30/05 23:13      
               I recall      Erik Malund      12/01/05 06:38      
   most likely it will blow up      Erik Malund      11/30/05 09:24      
      Not in every case      Valentin Angelovski      11/30/05 16:26      
         It is a common misconception that you ta      Erik Malund      12/01/05 06:42      
            motor drives      Terry Lingle      12/01/05 09:20      

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