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Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
Hi Patrick Would this be a good way to select the wire size. 1N/1I 2N/2I 3N/3I 4N/4I
N=turns,I=amp Then select the amps you battery can supply for a duration, then select the wire in the space to match the turns. If 1amp is to much, adjust to say 0.1amp..0.2amp..0.3amp. You could probable bruteforce the graph made with different starting amps, when the wire size and amps is selected, pick a battery with the required voltage
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Patrick wrote ...
Dr. Slack wrote ...
Heat losses depend on copper *MASS*, not copper area (other things being optimally designed for a motor of given power). This is one of the cases where you get what you pay for, directly in terms of materials. Buy less copper, and your power goes down, or your losses up. Buy a stronger magnet, everything else gets better.
if the length is constant, increasing diameter does increase mass.
My feeling is that it helps everybody, anybody who wants to particpate in the discussion, noobs certainly, and maybe yourself as well, that if you have in mind a quantity that has dimensions of volume, m3, you call it that, rather than area, which is m2, and assume another dimension coming in by magic. Communicating in exactly the units that matter is good practice. How many of us wince at confusion between energy and power, what's a second left out the equation between friends?
I notice that I'm using mass and volume interchangeably, but in my defense I think the density of copper is a more valid assumable in this discussion.
The number of turns does not matter, other things being equal. However, usually things are not equal, which creates apparent differences due to availablity of specific voltages, or wire sizes, or stator slot widths and lengths. Now if the discussion could go along the lines of 'for this motor iron size, this wire diameter gets more copper onto the motor than this size', then we'd probably get somewhere.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
The number of turns problem has an optimum when looked at purely as a motor as discussed above,
when battery, wiring and electronics are included, there becomes a point when few turns/high current causes significant loss in the circuit external to the motor. so the 'optimum' motor or motor/gearbox setup will not be the most efficient system.
if moving to lower voltage supply then delta should be easier than wye for high speed.
I can't imagine how many iterations are required for optimising rotor, gearbox, motor, controller and battery .... a lot !
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Electrical and Magnetic Circuits of a Motor
