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Magnet orientation


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#1 chasbeeman

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Posted 21 February 2017 - 02:30 PM

I'm a novice at motor building, but do own a compass and was curious if all motors have the poles (N/S) in the same position. I think I built one backwards years ago and didn't want to repeat that mistake.

 

Thanks in advance for any information!


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Charles Beeman




#2 Cheater

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Posted 21 February 2017 - 02:40 PM

Charles,

 

The motor doesn't really care which way the magnets are installed. All it effects is the polarity of the electrical connections to the motor itself and you simply have to reverse your leadwire hook-up.

 

That being said, I think it is traditional to have the rearward magnet on a sidewinder/anglewinder be the south (or white magnet).

Most racers who build motors try to install their magnets all the same way so they can swap motors in and out of their chassis without having to change their leadwire set-ups.


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#3 Taylor Davis

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Posted 21 February 2017 - 02:42 PM

As long as the endbell doesn't have any advance timing I agree with Greg. :)



#4 Half Fast

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Posted 21 February 2017 - 02:58 PM

A ceramic magnet motor can be re-zapped to change an incorrect orientation.

 

Cheers.


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#5 MSwiss

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Posted 21 February 2017 - 03:22 PM

The motor doesn't really care which way the magnets are installed. All it effects is the polarity of the electrical connections to the motor itself and you simply have to reverse your leadwire hook-up.
 
That being said, I think it is traditional to have the rearward magnet on a sidewinder/anglewinder be the south (or white magnet).

Most racers who build motors try to install their magnets all the same way so they can swap motors in and out of their chassis without having to change their leadwire set-ups.

  
Good post.
 

A ceramic magnet motor can be re-zapped to change an incorrect orientation.

 

So can cobalts.

That's how multi mag setups are typically built.
 

As long as the endbell doesn't have any advance timing I agree with Greg. :)

 

Doesn't matter.

As Greg mentioned, you just flip your leadwires (to get the motor to turn the way the armature/magnets are timed)


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#6 Taylor Davis

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Posted 21 February 2017 - 03:26 PM

As Greg mentioned, you just flip your lead wires(to get the motor to turn the way the armature/magnets are timed)


You can, but that defeats the purpose of having an advanced endbell, unless you want to retard the timing.

#7 MSwiss

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Posted 21 February 2017 - 03:40 PM

No.

Timing has nothing to do with polarity.

However the mags are zapped, once you get the lead wires hooked up correctly, to make the motor run in the right direction, it's spinning the same way.
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Mike Swiss
 
IRRA® Components Committee Chairman
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Two-time G7 World Champion (1988, 1990)
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mikeswiss86@hotmail.com (also my PayPal address) 
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Make checks out to Chicagoland Woodworking, Inc.


#8 MSwiss

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Posted 21 February 2017 - 03:48 PM

To be more clear, unless the motor has zero timing, it's destined to run better in one direction.

It doesn't matter if the armature is timed 20 degrees at the arm, or 15 degrees at the arm and +5 degrees at the endbell.

That's why anglewinder chassis are designed to accept motors running in one direction.


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Mike Swiss
 
IRRA® Components Committee Chairman
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Two-time G7 World Champion (1988, 1990)
Eight-time G7 King track single lap world record holder
17B West Ogden AveWestmont, IL 60559, ( 708) 203-8003
mikeswiss86@hotmail.com (also my PayPal address) 
Note: Send all USPS packages and mail to: 5858 Chase Ave., Downers Grove, IL 60516
Make checks out to Chicagoland Woodworking, Inc.


#9 Taylor Davis

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Posted 21 February 2017 - 03:57 PM

OK, that makes sense, I stand corrected.



#10 havlicek

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Posted 21 February 2017 - 03:59 PM

To be more clear, unless the motor has zero timing, it's destined to run better, in one direction.

 
 ... and even with zero timing, it still might run a bit better in one direction!


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#11 Les

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Posted 21 February 2017 - 04:23 PM

John,

 

That would depend on which side of the equator you are on. :)


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