They will, but so will that have an effect of the field outside of the can. It isn't a guarantee that a higher reading at the can is really a stronger field. Most of the field is retained in the core... To test I just spun up a motor putting a hall sensor right by the can, it was negligible.

So what is really needed then would be the ability to measure the field inside the motor, but where exactly? Where can you fit a hall sensor in the motor for testing? Maybe something in the shape of a rotor with sensors in it, that is inserted for the reading while electrolyzing the coils with a low current.

[/QUOTE]So what is really needed then would be the ability to measure the field inside the motor, but where exactly? Where can you fit a hall sensor in the motor for testing? Maybe something in the shape of a rotor with sensors in it, that is inserted for the reading while electrolyzing the coils with a low current.[/QUOTE]


EXACTLY what I was picturing. A sensor that is placed inside the stator. as each coil energizes, it will measure the strength of that coil. Of course, the rotor will not be inside the stator at the time.

How would PWM frequency affect wide open throttle? Isn't PWM frequency at WOT based on the rpm of the motor at that moment?

I understand how PWM would/could affect part throttle operation.

PWM doesn't affect full throttle, at full throttle the duty cycle is 100%

what I thought. I do hear people talking about finding the right pwm to get the best punch. I've always been skeptical of that.

PWM will affect punch, so long as it isn't a trigger full. Honestly, stock racing you pretty much set it to 1-2kHz if you have a ton of traction. But if you don't have traction and you are not grabbing a trigger full coming out of corners, then yes, PWM will have an effect. Lower frequency produces a touch more torque. This comes really apparent in mod, when I am running a 4.5 in mod TC, I set the PWM as high as I can without over heating the ESC, this helps calm corner exits down a bit for me.

So what is really needed then would be the ability to measure the field inside the motor, but where exactly? Where can you fit a hall sensor in the motor for testing? Maybe something in the shape of a rotor with sensors in it, that is inserted for the reading while electrolyzing the coils with a low current.[/QUOTE]


EXACTLY what I was picturing. A sensor that is placed inside the stator. as each coil energizes, it will measure the strength of that coil. Of course, the rotor will not be inside the stator at the time.[/QUOTE]


FYI, second test didn't yield as big of a difference, just 5 counts. I'm not convinced yet, but I'll see if I can put together something a bit more repeatable.

So, I have receive a lot of questions about the purpose of The Jerry. I explained it there, but I will also explain it here. Comparing motors on a tuner is great, but it doesn't really explain torque. Knowing the rotor's gauss and the motors inductance will give a good idea on torque, but it's still hard to determine which motor will have the most torque. The load master is a great tool to help determine that, but the motors will have a different load, so it can still be confusing. What motor is working the hardest when under the same load? With the WMH Racing Load Master, the faster the motor, the more of a load will be put on the drive motor. So, The Jerry allows me to gear the motors so they see the same load. The RPM, I post, would be an example of the spur gear's RPM and not the motor's RPM.

Look at the graph below. Lets compare the Tekin and the HobbyWing. If you compare the amp draw and RPM of each motor, you will see that the Tekin will draw less amps, at the same RPM, as the HW. For example, the Tekin has a 21,113 RPM with an 11.42 amp draw, vs the HW's 20,495 RPM and a 11.46 amp draw. This would show the Tekin has more torque. But then you compare them to the Surpass, and it becomes a huge difference.

Just getting into the motor tuning numbers. I am wanting to make sure I reading you correctly. According to the data, comparing the amps draw at comparable rpms, in terms of torque, the motors would fall in this order:
1. Exalt - 20,553 rpm / 10.95 amps
2. Tekin - 20,494 rpm / 11.26 amps
3. Hobbywing - 20,495 rpm / 11.46 amps
4. Surpass - 20,758 rpm / 11.43 amp

Actually, you would compare the amp draw then the RPM. Notice how the amps are pretty much the same?

1. Surpass - 11.43 amps - 20,758 rpm
2. Exalt - 11.47 amps - 21,873 rpm
3. Tekin - 11.42 amps - 21,113 rpm
4. HobbyWing - 11.46 amps - 20,495 rpm.

You start to compare them, from that point, as the load increases. Then you look at how much the amps increase as another tooth is added. You will start to see how the numbers will change. Notice how the fastest motors, at the beginning, start to burn much more power than the slower motors. That means the slower motors have more torque. Take a close look at the Tekin and the HW. with a 32T pinion, the HW has a much higher RPM, but the Tekin is burning 1.2 amps less. For the Tekin, for every tooth you add, you get over 500 RPMs and add less than .5 amps. So, if you add 3 teeth, you will be close to 23,500 rpms and be at around the same amp draw as the HW. But, in the real world, your motor will see a higher load than what my Load Master/Jerry is putting providing. So, the Tekin would be a much better motor on small technical, high traction tracks while the HW would be better for wide open fast low traction tracks. Anyhow, that's my personal theory on it, but from what I have heard, from many comments, the theory seems to be pretty good.

I wish I had the 41-tooth pinion when I tested the Tekin and the HW. That would really set the motors apart.

so for 2wd stadium truck on black crc med to large but tight sometimes your top choice would be??

That would depend on how much you are looking to spend. If you have $180, the better motor, I have tested, would be the Team Exhalt Phoenix Gold. If you are looking for under $130, I would go with the Team Exalt Phoenix Silver or the Surpass V6. The Surpass and Phoenix Silver are almost the same, but the Surpass showed a slight more torque and is $30 cheaper.

Thank you....surpass it is...too many exalt at my track I like to be different

Can anyone confirm if a Hobbywing G4R rotor will fit a G4 or G3 motor?

Yes, the G4R and G4. They both come with the same rotor. As for the G3, I cannot confirm that.