| ??? 11/30/05 23:26 Read: times |
#104460 - Not in every case Responding to: ???'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 |
| Topic | Author | Date |
| ac drive | 01/01/70 00:00 | |
| How to select | 01/01/70 00:00 | |
| Speed sensor | 01/01/70 00:00 | |
| Re: ac drive | 01/01/70 00:00 | |
| AC drives (inverters) | 01/01/70 00:00 | |
| AC Drive- Can you help? | 01/01/70 00:00 | |
| ABB, Siemens | 01/01/70 00:00 | |
| No, I have not been involved in inverter | 01/01/70 00:00 | |
| When & which make? | 01/01/70 00:00 | |
| I recall | 01/01/70 00:00 | |
| most likely it will blow up | 01/01/70 00:00 | |
| Not in every case | 01/01/70 00:00 | |
| It is a common misconception that you ta | 01/01/70 00:00 | |
motor drives | 01/01/70 00:00 |