http://groups.yahoo.com/group/lrk-torquemax/ building high-torque brushless e-motors Sun, 05 Jul 2009 15:56:21 GMT Ron van Sommeren http://groups.yahoo.com/group/lrk-torquemax/message/12262 http://groups.yahoo.com/group/lrk-torquemax/message/12262 ... That would resume e-mail reception in non-digest format. To resume in original format, send a message to lrk-torquemax-mail@yahoogroups.com Vriendelijke Sun, 05 Jul 2009 15:51:00 GMT Ron van Sommeren http://groups.yahoo.com/group/lrk-torquemax/message/12261 http://groups.yahoo.com/group/lrk-torquemax/message/12261 Goedendag, There are several ways to suspend and resume e-mail reception from this group. 1- via e-mail Suspend: Send empty message, no subject to: Fri, 03 Jul 2009 22:54:55 GMT plpastore http://groups.yahoo.com/group/lrk-torquemax/message/12260 http://groups.yahoo.com/group/lrk-torquemax/message/12260 I going to make a exterior rotor brushless DC motor, with 16 poles and 36 slots, airgap 0,6422 mm, diameter outside stator of 172 mm and diameter inner rotor Fri, 03 Jul 2009 22:54:49 GMT Plpastore http://groups.yahoo.com/group/lrk-torquemax/message/12259 http://groups.yahoo.com/group/lrk-torquemax/message/12259 Dear,   I thank lrk-torquemax@yahoogroups.com add me.   I am Brazilian descendant of Italian, a specialist in the design of mechanisms and this year I am Thu, 02 Jul 2009 18:07:01 GMT carl http://groups.yahoo.com/group/lrk-torquemax/message/12258 http://groups.yahoo.com/group/lrk-torquemax/message/12258 They use 400 hertz in alot of surplus military applications such as radar drive motors and other drives .All there generators are 400 hertz. Carl ... From: Joe Thu, 02 Jul 2009 13:15:33 GMT Joe http://groups.yahoo.com/group/lrk-torquemax/message/12257 http://groups.yahoo.com/group/lrk-torquemax/message/12257 Thank you Gentleman, for settling what seemed to be a contradiction. Regards, Joe Thu, 02 Jul 2009 11:34:40 GMT Poul Børge Pedersen http://groups.yahoo.com/group/lrk-torquemax/message/12256 http://groups.yahoo.com/group/lrk-torquemax/message/12256 That is because 400 Hz is the highest powerline grid frequency used. That is the simple explanation. Some people will say, they only know of 50 or 60 Hz grids, Thu, 02 Jul 2009 02:10:39 GMT Donald H Locker http://groups.yahoo.com/group/lrk-torquemax/message/12255 http://groups.yahoo.com/group/lrk-torquemax/message/12255 Hi, Joe. Any bad effects are all due to hysteresis, as far as I know. Thinner laminations and higher resistivity materials (metallic glasses, for instance, Wed, 01 Jul 2009 15:01:43 GMT Joe http://groups.yahoo.com/group/lrk-torquemax/message/12254 http://groups.yahoo.com/group/lrk-torquemax/message/12254 Hi Kenny, Thanks, but no I don't mean on the drive side. I'm just talking about the frequency in Hz created by the PM motor or generatior and what has been Wed, 01 Jul 2009 14:21:43 GMT Kenny Valdemarsson http://groups.yahoo.com/group/lrk-torquemax/message/12253 http://groups.yahoo.com/group/lrk-torquemax/message/12253 Are you sure you're not confusing 'drive' frequency with PWM frequency ? Standard AC motors(syncronous) and BLDC are quite different beasts... /Kenny Wed, 01 Jul 2009 14:07:28 GMT Joe http://groups.yahoo.com/group/lrk-torquemax/message/12252 http://groups.yahoo.com/group/lrk-torquemax/message/12252 In all the literature I've read most AC motors are designed to operate at up to 400hz. At 400 Hz they use special steels and higher still 1500+ move to other Wed, 01 Jul 2009 09:40:39 GMT Kenny Valdemarsson http://groups.yahoo.com/group/lrk-torquemax/message/12251 http://groups.yahoo.com/group/lrk-torquemax/message/12251 Jan, batt-mann.de has 65mm/24N /Kenny Wed, 01 Jul 2009 09:01:31 GMT janb2000nl http://groups.yahoo.com/group/lrk-torquemax/message/12250 http://groups.yahoo.com/group/lrk-torquemax/message/12250 Dear Ron, that looks good. A large number of poles / magnets to obtain a low speed motor. My biggest problem is how to get the stator plates. 24 / 65 mm is Wed, 01 Jul 2009 01:22:02 GMT carl http://groups.yahoo.com/group/lrk-torquemax/message/12249 http://groups.yahoo.com/group/lrk-torquemax/message/12249 Hi Guys,Where can I buy some custom magnets?I keep trying to contact supermagnet guy but he dosnt respond back.I have  a 24 tooth stator that is 100mm in Wed, 01 Jul 2009 00:57:22 GMT Donald H Locker http://groups.yahoo.com/group/lrk-torquemax/message/12248 http://groups.yahoo.com/group/lrk-torquemax/message/12248 If the steel is not good, you may have significant losses due to hysteresis, but I don't see any permeability problem at 1200Hz. Or maybe I'm missing a part