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Model Forum / General / Railroads / September 2004Converting Hornby Ringfield Motors
Hello Does anyone know if it is possible to fit the 5 pole armature from their ringfield motor straight into the older 3 pole ringfield motors Thanks Gary > Does anyone know if it is possible to fit the 5 pole armature from their > ringfield motor straight into the older 3 pole ringfield motors It's not possible, they have different armature shaft diameters. John. Grrrr the sly buggers :-) oh well Thanks anyway John > > Does anyone know if it is possible to fit the 5 pole armature from their > > ringfield motor straight into the older 3 pole ringfield motors > > It's not possible, they have different armature shaft diameters. > > John. You would think someone would have invented a brushless DC motor by now? kim :o) >You would think someone would have invented a brushless DC motor by now? > >kim :o) Why don't you set to work and invent one? After you've perfected your perpetual motion machine, squared the circle and duplicated the cube of course.  SignatureJohn Sullivan OO in the garden http://www.yddraiggoch.demon.co.uk/railway/railway.html My next project: Extend the layout back up the other side of the garden. >> You would think someone would have invented a brushless DC motor by now? >> [quoted text clipped - 3 lines] > perpetual motion machine, squared the circle and duplicated the cube of > course. Like this perhaps: http://www.teamnovak.com/products/MOTOR/motor.htm this type of motor has existed for many years. > You would think someone would have invented a brushless DC motor by now? > > kim :o) It's called a linear motor. Ken >> You would think someone would have invented a brushless DC motor by now? >> [quoted text clipped - 3 lines] > >Ken No its not. Linear motors are a different thing entirely and could be built with brushes although most are AC and don't need brushes any more than rotary AC motors do. Keith Make friends in the hobby. Visit <http://www.grovenor.dsl.pipex.com/> Garratt photos for the big steam lovers. The problem with DC brushless motors is Torque, unless you have large windings and rotors they do not produce much torque. Sony developed Tiny brushless dc motors for there top of the range walkmans in late 80s and early 90s but these would not produce enough torque to be useful in a loco. That's my two penneth worth Gary > >> You would think someone would have invented a brushless DC motor by now? > >> [quoted text clipped - 13 lines] > Visit <http://www.grovenor.dsl.pipex.com/> > Garratt photos for the big steam lovers. Dc Brushless motors have been around since the very late 1960s in the hi-fi turntable world but the problem with them is they do not produce enough Torque unless you have large windings and rotors and associated circuitry to drive them. Sony developed Tiny brushless dc motors for there top of the range walkmans in late 80s and early 90s but these would not produce enough torque to be useful in a loco. That's my two penneth worth Gary > >> You would think someone would have invented a brushless DC motor by now? > >> [quoted text clipped - 13 lines] > Visit <http://www.grovenor.dsl.pipex.com/> > Garratt photos for the big steam lovers. >>> You would think someone would have invented a brushless DC motor by >>> now? [quoted text clipped - 14 lines] > Visit <http://www.grovenor.dsl.pipex.com/> Garratt photos for the big > steam lovers.About Linear Motors Sorry, missed your follow up. Just changed my newsreader characteristics and it surfaced. Look at:- Globalspec Engineering search Engine Show all Linear Motors companies Quote <Linear motors generate force only in the direction of travel. A linear motor applies thrust directly to a load, and does not require any intermediate mechanism to convert rotary motion into linear motion. Linear motors are capable of extremely high speeds, quick acceleration, and accurate positioning. Choices for linear motors include moving coil, moving magnet, AC switched reluctance design, AC synchronous design, AC induction or traction design, linear stepping design, DC brushed design, and DC brushless design.........> Unquote Ken. |
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