Redo: The motor info, I sent to this group and some other groups (like Wind Mill) as information for future use. The set up you are indicating for many uses is not necessary.
Basically if run at the Low RPM to generate the desired 50, 60 Hz or even other frequencies is easily obtainable with Banki turbines -- directly -- without RPM multipliers. The Motors are expensive because they are high quality and, as well, the cost of using large size magnets to generate higher KWs. Controls to manage the output power under emergency conditions are common and standard, like water regulated dumping, ballast loading, Nozzle direction re-routing, etc. Indeed, there are more adaptable to low RPM systems like a wind mill, but under certain cases they could be used with Hydro systems. Regards Nando ----- Original Message ----- From: "Radu Babau" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Wednesday, October 26, 2005 6:46 AM Subject: [microhydro] permanent magnet synchronous motors from ABB > 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 > > > > > > > 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 > > > > > > > ------------------------ 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/
