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Unread 10-23-2016, 09:45 AM   #11
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Default Re: Armature modification

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Originally Posted by timmyjane View Post
I'm asking about the larger main part of the armature and not the lower area where the brushes make contact. I have heard that by removing material from the upper area (maybe made of steel) performance can be improved.
I scrolled back to read more. I was on the road when this thread first posted or I would have responded sooner. I think what you're referring to here was a practice that had been done on brushless AC induction armature designs where there are cast aluminum 'windings' poured into the rotor and bonded on both ends by cast aluminum rings that are cast all at once. There were some that drilled lightening holes into the laminations between the castings in order to reduce rotational mass. This resulted in lowered torque and faster spinup due to the lowered rotational mass, but it would not be applicable to modern golf cart motor design. Those motors were typically of less than 50% efficiency. Golf cart motors are totally different, where efficiency needs to remain peaked.

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Unread 10-23-2016, 08:32 PM   #12
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Default Re: Armature modification

All very interesting. Thanks for the replies and information. What could be done with a shop full of tools to a motor/armature to get performance gains. Saying, of course, that someone had the skills. Again not trying to do anything just learning.
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Unread 10-23-2016, 08:44 PM   #13
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Default Re: Armature modification

Not much if anything.
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Unread 10-23-2016, 08:51 PM   #14
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Default Re: Armature modification

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Originally Posted by timmyjane View Post
All very interesting. Thanks for the replies and information. What could be done with a shop full of tools to a motor/armature to get performance gains. Saying, of course, that someone had the skills. Again not trying to do anything just learning.
My suggestion would be to sign up for a course in electric motor rewinding. They should teach you what you'll need to know.
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Unread 10-23-2016, 10:29 PM   #15
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Default Re: Armature modification

These motors are a bear to rewind. You would need some fancy equipment and training to do it right.
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Unread 10-24-2016, 10:22 AM   #16
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Default Re: Armature modification

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Originally Posted by timmyjane View Post
All very interesting. Thanks for the replies and information. What could be done with a shop full of tools to a motor/armature to get performance gains. Saying, of course, that someone had the skills. Again not trying to do anything just learning.
Performance gains come in many flavors and for the most part are compromises between speed and torque.

In very general terms, if you rewind the motor to produce more speed (reaches a higher RPM with same voltage applied and same mechanical load applied), the amount of torque it generates at low RPM is reduced. Conversely, if you rewind the motor to generate more low end torque, it won't reach as high of RPM at the same voltage with the same load.
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Unread 10-24-2016, 08:31 PM   #17
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Default Re: Armature modification

How does PQ offer up performance boosts with the Bandit motor without rewinding? Based on the comments it doesn't seem possible.
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Unread 10-25-2016, 09:48 AM   #18
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Default Re: Armature modification

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How does PQ offer up performance boosts with the Bandit motor without rewinding? Based on the comments it doesn't seem possible.
They rewind the motors.

I'm speculating, but my guess is they definitively rewind the field coils and possibly the armature also.

-------------
Whether a motor is a Torque motor, a Standard motor or a Speed motor depends on the relative strengths of the electromagnetic fields produced by the moving (armature) and stationary (field or stator) windings. A torque motor has a relatively strong stationary electromagnet while a speed motor has a relatively weak stationary electromagnet and a standard motor is somewhere in the middle.

If the electromagnetic strength of the armature remains the same, weakening the strength of the field increases speed, but reduces low end torque while increasing the field strength increase low end torque, but reduces speed.

Again, I am speculating, but to increase both speed and torque like some motor re-manufacturers do, the total electromagnetic strength of both the moving and stationary fields have to be increased. Motor manufactures do it by using a longer motor chassis and armature, while re-manufacturers using a stock motor chassis has to add more turns of wire in the original space available, or something like that.
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