Hmmm...just curious as to the inductance readings for an upgraded Novak 4300 motor? Reading needs to be taken from a motor with the sintered rotor.

I would be very interested to find out if it makes a difference. Inductance is a property of the coil.

Have meter on the way. talk to the man today should read in the 26 range or above.

Which one did you get Kevin?

ta_man....yes it is a property of the coil, but you have to induce something into it. Which is why you have to rotate the motor to get the inductance reading correctly.

26- 29 seemed to be the average this weekend with the sintered rotor.

13.5 motor is in the 50+ range with a standard rotor.

ta_man....yes it is a property of the coil, but you have to induce something into it. Which is why you have to rotate the motor to get the inductance reading correctly.
Not entirely true. You measure brushed motor armatures out of the can with no magnets at all.

The reason for rotating the shaft is to find the lowest reading as the location of the rotor affects the reading. The question is: It it just the location or also the strength of the rotor that affects the reading?

26- 29 seemed to be the average this weekend with the sintered rotor.

13.5 motor is in the 50+ range with a standard rotor.

I thought that Charlie from Novak said they shouldn't be below 30? At least that is what the said at the Novak race in the spring.

One more question. Shouldn't the inductance meter read the same no mater what arm you have in your brushless. It should be reading lenght of the wires in the can right? So the rotor shouldn't have any effect on the reading.

The strength of the rotor magnets will lower your inductance readings.

The strength of the rotor magnets will lower your inductance readings.

Can you explan to how it does this or point to an artical to read Rob? As a track operator I'm trying to learn all a can about the brushless so can police the class.

Not entirely true. You measure brushed motor armatures out of the can with no magnets at all.

ta_man, I'm speaking entirely of brushless, hence posting this in the brushless section. :) You measure brushed motors out of the can because of how the brushes/comm. contact area affect the readings.

Sonny,

I know you did some random 4300's, but did you tech any 13.5 at the race? I really didn't expect the 13.5 to be THAT much of a difference, wow. Not questioning the number (50), but that's a huge jump.

I know when I replaced the rotor in my 4300, the windings looked like complete crap (pattern wound my $%%). The alternator on my Mazda has 50 times the wire as my 4300 and it's perfectly neat and tidy looking! :)

Motor ModelInductanceSS430029-33* µHSS580019-23* µH


* Inductance should never be below 27 µH for SS4300 or below 17 µH for SS5800

This is right off of Novak's site for what the inductance should be. I don't know if they have updated the site since the upgrades have come out.

Jason

Last year at the Novak race I asked Charlie to check my motor with his meter and compare it to my meter. His meter read 1-2 points higher but Charlie lengthened the lead wires a bit for ease of use. My manual says the lead length is critical to get an accurate reading. If the lead length is not calibrated with the meter, the reading will go up.

I know when I checked my 4300 it was right where Novak said it should be but when I put the sintered rotor in it dropped well below the allowed range. How does one address this in tech?