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Magnetic Effect On Motor Performance


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#1 jphanna

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Posted 12 April 2019 - 02:34 PM

guys, maybe this has been brought up long time ago, maybe not.....given 2 motors, say 23K

1. one has magnetic effect
2. one does not

in just motor performance only, (not handling) does the fact that the motor with 'magnetic effect ', actually out perform their non magnetic effect counterpart?

is there more low down grunt?
is there more top end?
none of the above?
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#2 charlesx

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Posted 12 April 2019 - 10:16 PM

Hi jphanna.

No expert on this matter but Magnetic effect motors are mainly for magnet racing on plastic track or races on wood with magna braid. I do not believe of any benefit on an ordinary track as normal braid or copper is not magnetic. Not sure though if magnets in motor are stronger and hence motor is more powerful. Sure somebody will be able to tell you this. Competitions also often provide a magnetic effect limit which is measured with a magnet marshal apparatus. Hope this is of some help. Regards Chas Le Breton (charlesx)

#3 Peter Gunn

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Posted 12 April 2019 - 10:27 PM

The answer generally is yes, i have run the Slot it 23 against the B.R.M 23 and noted the following .

1.on any plastic track with metal rails the BRM outperforms the Slot it in every department, for the obvious reasons the magnetic effect.

2. On wood track with copper tape the BRM has a quicker acceleration pick up, but the main gain with this motor is breaking, will out break the Slot it with the same configuration and gearing every time gained 4 tenths a lap, both geared at 3 to 1 inline, or 11 to 32 sidewind

3. Reasons why in my opinion, taking the BRM motor first being a mag type motor the magnets in the can are better so you get more performance out of it, and looks such a plain motor , but has the performance , turning to the Slot it the current motor is a very good motor with good improved brush gear retention, but in a direct comparison my choice for performance is the BRM, i cannot speak on other mag S cans as i don't own any but guessing like for like the better magnets in those cans should give similar performance .

#4 difinity

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Posted 13 April 2019 - 06:43 AM

In the ‘older’ days, we called it ‘having good magnets’.
A stronger or higher magnetic field will create more torque, and if the brushes and arm wind allow, more rpm.

With the sealed motors we run today, you can’t really adjust these parts to get the effect you want, but a higher mag motor can always be geared taller, giving more speed. I used a Dodo in one lemans car a couple of years ago to run on a commercial track. Had to gear it at about 1.4:1 to smooth it out. Undrivable on my copper braid track because it was so aggressive.

The other advantage of these motors is in magnet racing as noted above.

Best to find the motor you are allowed to run, and set your car up for smooth running (balance, gearing etc) rather than rely on the mag effect alone IMHO.

#5 Kevan

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Posted 15 April 2019 - 06:28 AM

You can only compare motors if they have the same performance, OK both are 23k what are the torque figures and power output? I bet they're totally different. Don't be blinded by the peak revs figure, it's only one of many aspects of a motor, you can easily get a lower rpm motor lapping quicker than a higher rpm motor if the other characteristics are more favourable.
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#6 jphanna

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Posted 15 April 2019 - 10:55 AM

thanks for the insight guys.

it makes sense that if a motor has stronger magnets that it should perform better.

btw...i never set up a car for magnetic effect only. always set up on copper braid. magnetic effect, if its avail at a certain venue, is a bonus.
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