Motor rebuild kits: 1410 and 1415

[Pdelcast]

Originally Posted by ta_man

Got a question on these (sort of). Since they have been out, I have had 6 different 1410 motors in my possesion. The first three (manufacturing time wise) had wires about 4-5 inches long. The last three have wires about 8-9 inches long.

Interesing observation: There is a significant difference in the magnetic detent strength between the early motors with the short wires and the later motors with the longer wires. About as much and maybe even more difference than between a Castle 1512 and a Castle 1518 (both of which I own). Another way to characterize this: The difference in magnetic detent strength between the short wire 1410s and the long wire 1410s is greater than the difference between the 1406 and the short wire 1410. At least to my fingers.

Is this difference because of a change in the magnets? And so the real question: Do the rebuild kits have the same magnets on the rotors as the later 1410s with the long wires?

I'm sure the length of the wire is incidental, and just indicates a running change in the spec for wire length but it curious that all the long wire motors I've had have apparently stronger magnets.

I realize this effect could, alternatively, be a design change in the stator, so I'm asking the question.

There has been two small changes in the magnet design on the 14xx series since we started building them.

Neither of them has anything to do with the cost of magnets (unfortunately.)

One was to make the rotors more consistent from production run to production run (magnet alignment)

The other was to improve back-emf matching.

So yes, you might feel some difference between earlier and later build-date motors.

Thanx!

Patrick

[ta_man]

Originally Posted by Pdelcast

There has been two small changes in the magnet design on the 14xx series since we started building them.

Neither of them has anything to do with the cost of magnets (unfortunately.)

One was to make the rotors more consistent from production run to production run (magnet alignment)

The other was to improve back-emf matching.

So yes, you might feel some difference between earlier and later build-date motors.

Thanx!

Patrick

Thank you. But now:

1) What does "improved back-emf matching" do for us in terms of motor control, driveability, or performance?

2) Would it be correct to assume that since the rebuild kits came out after the first of the newer dresign motors with the stronger detent feel, that the rebuild kit rotors would be the same as the newer design rotors in the motors?