looking for an RPM meter ( revolution per minute meter) for a dc motor !!?
926392
Do you have to build it or can you buy it? Radio Spares/ Allied Components supply these things off the shelf.\n\nYears ago tacho generators were made using a dc generator (hence the name) that produced a certain number of volts per number of rpm, usually expressed in volts/100 rpm. This may not give the accuracy you require.\n\nModern tacho generators are basically pulse encoders, that may be optical or proximity switch based, and the pulses are counted by some electronics and converted to an rpm reading. The actual design depending on the application. Do you want a display or a signal (0-10v, 0-20mA etc) that can be used in control? Optical based encoders can give you much more accuracy than you want but I could never understand wanting to make, or being able to make something of this complexity.
834512
Torque is not the right question to ask in this problem!\nFirst define the generator output in terms of watts.\nAssume an efficiency of 0.8 for the generator and define the Input of the generator (In = Out / 0.8).\nThis is the output of your motor (assuming some diesel/petrol).\nTorque is expressed as N/m (force x radius) and is part of the electric generator specs.  See there to get the equivalence.\nUsually, the motor power is also 0.8 efficient, so the motor power should be W / (0.8*0.8) and that will give you the right ratio.
523969
The best controller in my opinion would be a dc chopper that smoothly reduces input voltage to the motor thus slowing it smoothly.
748213
Try Edmund Scientific on the web..but if you want to make your own try the link provided.\n\nGood luck!
849547
Texas Instruments has a website where you can download a users manual.\n\nOther makers probably have the same thing.
677244
One really needs the manufacturers part number to get that information. If the dataplate is gone, you can ohm out the windings, and through the process of elimination determine the  proper connections. You might want to check out the stepper motor seciton at CNC zone.\nhttp://www.cnczone.com/forums/forumdisplay.php?f=193
478080
Is this for an electric motor or an engine? \n\nNEMA National Electrical Manufaturers Association) has a standard set of starters for electric motors. Try a web search, I bet you will find what you want if you are talking about an electric motor.
818883
Es = L*r*w (w=2piN) , N=600 rpm=10rps , L=9 \nEs = L*r*2pi*N) , N=10, L=9 \nEs = 9*0.18*2*3.14*10\nEs (Shaft Energy)= 101.734 Newton/second which is not a unit of power.\n\nPlease specify the units of r,Es,L=95 or 9 ?\nWhat is the unit of Ee? HP or KW?\nfurther you have given following data which are contradictory.\nPump Shaft Speed =1200 ?\nEe (Electrical Energy) = 67.2\nT = 1.62\nw (Rotational Speed)= 62.8
93948
There are molecular vacuum pump motors that spin in the 100's of thousands of revolutions per minute.  I know this doesn't answer absolute highest, but it puts things in perspective.
640257
try google\nor siemens .com
780568
In this site:\n\nhttp://www.coolmagnetman.com/magacmot.htm\n\nyou will find what you are looking for.  (You may need to jump to another site from there if you want more).
525309
1) Convert rpm to revolutions per second, by dividing rpm by seconds (so the minutes cancel).\n\n2)Convert revs per sec to radians per second, by multiplying rev/sec *2pi rad/rev (the revs cancel).\n\n3 Acceleration is in the form of distance/(time^2), so dividing radians per second by the time required to stop will give you the magnitude of acceleration over that time period. \n\nFor your example:\n\nrotational acceleration = \n            1000 rev/min *1 min/60 sec* 2Pi rad/rev *1/2 sec\n           =  52.4 rad/sec^2\n                 \n\nPart 2:"\n\nIf by distance you mean radial distance traveled by the tip of a spinning blade, then you know that \n\n1 revolution = 2*pi*r \n\nso to find the number of revolutions, multiply the distance by 1 rev/(2*pi*r)- the units of linear distance will cancel (see a pattern?).\n\n(distance) * 1rev/(2*pi*r) = number of revolutions
807379
Your question is SO unclear.\n\nWhy are you not looking for submarine motor kits? http://www.patronic.com/motors/motors.html\nhttp://www.dogpile.com/info.dogpl/search/web/submarine%252Bmotor%252Bkit/1/-/1/-/-/-/1/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/417/top/-/-/1/0
873132
What sort of prints? What sort of current do you want to source? How few milliviolts do you want?
1169017
A voltmeter and an ammeter will provide the input power. You will need some form of dynamometer to measure output power.\n\nOutput power divided by input power yields efficiency.
727926
88 revolutions per 5 seconds = 88/5 rps = 17.6 rps (revolutions per second) or in rpm...\n=  88*60/5 rpm = 1056 rpm (revolutions per minute).
1146491
Look for caliper (spelling counts).  Specifically, Vernier Caliper, and micrometer.  \n\nThose are the two major precision measuring tools.  Try the starrett.com web site.  They have a sterling reputation for quality.