Dear All,
You can download the manual for these motors at: http://library.abb.com/GLOBAL/SCOT/scot259.nsf/VerityDisplay/28CB0CA418BA1F8CC2256F3900385D0B/$File/Permanent%20magnet%20motors%20GB%2005-2004.pdf These are basically 10 pole synchronous machines (600 RPM RATED SPEED), with permanent magnets in the rotor, which can ONLY BE USED WITH FREQUENCY CONVERTERS. If you want to use them for generating purposes, you need a 4Q frequency converter (i.e. ACS811 family from ABB), which needs a regular 50 Hz grid. So, good-bye island operated applications. There is no other way to change the number of poles, or so, available for this motor family. The flexibility goes with the converter. If you simply take this kind of motors and spin it with a turbine (without a converter I mean), and you happen to loose the turbine at something like 1500 rpm, you will have 380*1500/600 = 950 Vac at output, simply because there is a permanent exciter field imposed the rotor magnets - which cannot be killed. What I am trying to say is that brusless excitation is not always an advantage. The price of this motor + inverter combination is awsomely high. This special motor is 2 times more expensive than a regular ABB induction motor, while the 4Q converter is actually made of 2 standard back-to-back 2Q converters, therefore twice the price of a regular ABB converter. Beside the fact that ABB is not a cheap supplier, you would also need a chopper+braking resistor, just for the funny case when you loose the network and you would like to avoid overspeeding the turbine. I think this PM machines are most suitable for wind application (very low speed, without gearbox, with inverter). BR, Radu ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/FGYolB/TM --------------------------------------------------------------------~-> Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. The microhydro-group does not endorse products or support the advertisements in any way. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
