Post by thread:[ee]: Solenoids, is there a way to calc their powe

Hello Sports Fans, I was wondering if modern science yet knows of a way to calculate the strength of a solenoid's pulling/pushing force, by number of winds, or diameter of wire, or current applied or voltage etc Is this possible? Thanks Sports Fans! -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

F = BIL where F is the force in Newtons B is the magnetic field measured in... um...Newtons per amp-meter (yes that's probably cheating) I is the current in amps L is the length in meters of wire in the field this assumes that the wire is at right angles to the field (which it will be), that the magnetic field is constant (which it won't be, pretty sure a solenoid will use a long coil in a short gap, but it should not be too far wrong) probably assumes some other stuff too but I can't think of anything useful right now. stuff that becomes apparent from the above: more current means more force, until the wire burns out of you demagnetise the permanent magnet. longer wire means more force, but to fit more wire in you will need to use thinner wire which will mean lower current rating... not a great way to change to force of a solenoid, unless you feel like winding a solenoid with rectangular section wire, which will give you a nice packing ratio... Should give you a start anyway... if nothing else then try searching for that equation ;) Regards, Simon p.s. have a happy w/e everyone. friday at last! -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

I don't know how modern this science is, but what you asked for depends on the following items: - the exact geometry of the winding, not just coil wire diameter. - current through windings - exact structure of the magnetic circuit - exact shape of the magnetic field density over the entire volume of the armature - exact magnetic permeability of the armature - exact position of the armature inside the solenoid. I hope that I did not leave anything out. If you are good about computer simulation then you can make a reasonably accurate model of a solenoid with partially inserted core and obtain some reasonably accurate numbers. The only way I know to do this is to buy the solenoid with a datasheet (or find a datasheet for what you have). Peter -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use spam_OUTlistservTakeThisOuTmitvma.mit.edu?body=SET%20PICList%20DIGEST

>Hello Sports Fans, Do violent video games count :-) >I was wondering if modern science yet knows >of a way to calculate the strength of a solenoid's >pulling/pushing force, by number of winds, or >diameter of wire, or current applied or voltage >etc > >Is this possible? Yes. If you do a web search for coil gun you may find what your are looking for. Scott -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use .....listservKILLspam@spam@mitvma.mit.edu?body=SET%20PICList%20DIGEST