Such a motor is in principle an ordinary 3 ph asynchronous motor. Connect it to 400 V, 3ph, 50 Hz and it will run at 3000 rpm (or 1500 with four poles etc.) like any other motor of this kind. So, these motors are produced as machine drives in large numbers and cheaper than special ones. There are, however, special shapes and mounts to suite the needs of special installation sites.
The trick is the electronic phase generator. It contains MOSFET or IGBT transistors that are cheaper as high voltage, low current models than vice versa. And rectifying standard mains voltage without transformers is the cheapest and lightest way to provide the power. These motors are not especially fit for servo purposes, but cheap and, with some compromising, there is simply a trade off between price and performance. Peter Gabriel Willen schrieb: > Sorry for any misspelled words, I'm writing this from my phone with limited > time. > > I understand just about everything when it comes to 3 phase motors with the > exception of one thing. Voltage, I can't figure out why servo motors run > on such high voltages. I have searched and searched for an explenation > with no prevail. What would a motor with a 310 voltage rating and > continuous current of let's say 5 amps benefit from a motor rated at 48v by > 15 amps. Assuming all other parameters are the same such as 8 poles, same > frame size. Also i notice on bldc motors there is a lot of cogging between > the poles, feels like soft gear teeth. How could one use a Bldc as a servo > with this issue? What prevents it from settling in those slots when > stopped. Sorry docket my ignorance I hope I can get this answered. > > Gave > ------------------------------------------------------------------------------ > For Developers, A Lot Can Happen In A Second. > Boundary is the first to Know...and Tell You. > Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! > http://p.sf.net/sfu/Boundary-d2dvs2 > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! http://p.sf.net/sfu/Boundary-d2dvs2 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
