Shop our Airplanes Products Drone Products Sales
Thread Tools
Apr 13, 2011, 11:49 AM
Registered User

Winding turns calculation.?


i have permanent magnet DC motor and it s attributes :
Voltage=12 Volt
Current=2,5 A (No Load)
RPM= 3000 rpm (No Load)

lamination size :
diameter :81 mm
lenght :21 mm
Pole : 4 poles (N-S , N-S)
Each magnet has: 1000 gauss
Brush :4 brushes
Hook count:20

and windings of this motor is: 0.80mm(diameter) x 14 (turns)

Firstly anyone can express me how can i design dc motor with formulas? i mean how will i calculate Resistance of windings?( and how will i canculate others (R, E, I)?(current division factor?resistance and magnetic flux... i cant realize how will i use them....?there are 4 poles but must i use just N pole counts?

Another Subject , i want to design this motor in 24 V (Current and RPM, magnets, size will be the same, i can change only winding turns and wire diameter). How can i do it? anyone can express me with formulas?
Sign up now
to remove ads between posts
Apr 13, 2011, 01:42 PM
Registered Aircraft Offender
Truglodite's Avatar
I use this thread as a primary reference for motor equations on RCG:

Kv is related to the termination and # of turns for a given motor... Kv*turns=constant. Be aware there are winding schemes that may physically have 12 loops of copper, but as far as physics and math are concerned they are really 6T (4T, 3T... endless possibilities). So you also must take note if the wind is terminated with parallel coils or not.

Once you establish Kv*T for your motor, you can design the number of turns/termination that will give your target Kv for your application. The exact Kv depends on how your load behaves. The dynamics of your load is something that motor equations won't help with. So you also need to put a number on operating torque.

With double the input power at the same RPM, hopefully you'll operate at least double the torque, otherwise efficiency will be lower than the original. That said, if you're running the same torque and RPM, the current could be a bit less than half the original (more efficiency as amps drop). Hope this $.02 helps... there are much more knowledgeable motor calc guys out there who might chime in with the good stuff.


edit: regarding wire thickness... calculate the total cross sectional area of the original windings, and try to meet or exceed that as best you can. More copper area is ALWAYS better.

Wait a minute... just noticed "brushes"... this info pertains to brushless, LOL! Sorry.
Last edited by Truglodite; Apr 13, 2011 at 01:50 PM.
Apr 14, 2011, 12:13 PM
Registered User
i cant winding 2 x Nold(14 turns) for my motor. Because physical size of my armature is not available(for 28 turn, 0,80 milimeter diameter wire.).
12V, 14 turns, 0.80 mm diameter.
24V, X , X ?
Armatures are the same in both motors. if i design 24V 0x55 mm and 28 turns so could be done well?

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion DC motor winding turns, wire diameter calculation.? mir_as82 Electric Motor Design and Construction 50 Apr 05, 2011 04:22 PM
Discussion What is the type of this motor winding? Dt.Serkan Electric Motor Design and Construction 1 Mar 27, 2011 06:53 PM
Discussion Calculation of the winding number of 6N4P Monie Electric Motor Design and Construction 0 Jan 30, 2009 12:14 AM
Discussion Calculation of winding numbe Monie Electric Motor Design and Construction 6 Jan 19, 2009 07:19 AM
Winding Tool / Counting Turns goldguy Power Systems 1 Dec 20, 2004 05:19 PM