RC-Monster Forums - MM hesitates/stammers on slow take off. Where should I start

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Quote:

Originally Posted by lincpimp (Post 154588)

Are you running the upgraded firmware with the neu too?

The 2 pole motors seem to be quiter on startup than higher pole counts. It is a totally different startup routine from the old firmware. Seems like it switches at a reasonably low rpm to different frequentcy. I will actually say that my plett max (4pole) runs smoother than my hacker motors with this revised software. Not sure why, but it seems like the mm likes the higher pole counts better, depending on gearing etc.

I have a novak 6.5 that I would like to try on 3s in my ls10. Just need to wire it up and give it a try. I was waiting on the 5mm shaft upgrade first. Just broke a c50 maxx shaft and would prefer not to do that again!

The Novak 5mm upgrade is available, I got mine over a week ago

Quote:

Originally Posted by Gee (Post 155467)

Hey did notice a post here. Yeah, got the new software and firmware on the mm controllers. Does it matter to the motor if you are running a sensored ESC or not? Not sure it that is what I am asking. What is the difference between a sensored motor vs not sensored?

Well, a non-sensored motor is run by a non-sensored esc by sensing the back emf while firing the individual phases (I do not really understand this on a level to make electronics, but it is a method of determining the rotor position). With that info it can adjust the timing and other important parameters.

A sensored motor uses a hall sensor to determine the rotor position.

So any non-sensored esc can run any motor, with or without a sensor. A sensored esc can only run a sensored motor.

Okay so the Novak motor being "Sensored" shouldn't have any more of an effect on this then a sensored motor. It has more to do with the poles of the motor? I've been thinking about this the wrong way all along with the sensored sensorless stuff. What's the Novak motors as far as poles and the nue motor? I could go search for my answers but so far you've been a wealth of info for me.

Well the novak motors are different to a feiago in that they have a slotted stator. They share this with the neu motors, and before the firmware update the mm had issues getting them strated without cogging.

I have not seem what a slottled stator looks like, or really know how it differs from the other types. I do know that the segmented magnet (like a bunch of pennies stacked up to make a solid cylinder) are better for power production and effecientcy. The lehner and hacker c50 motors use these. The feigao uses a bonded magnet, like a mixture of magnet bits in epoxy from what I can understand. This is cheaper to manufacture, and not as good.

I do not know how many poles the novak motors have. Lehner, feigao, and hacker have 2 poles, as do the cc motors and the traxxas motor. Pletts have 4-6 poles, and the mega motors have at least 4 poles too.

Now the more poles the harder the esc has to work to get the motor to turn over 1 time. From my understanding the esc has to "fire" twice as much per motor revolution on a 4 pole as a 2 pole. That is why the higher pole counts have more torque.