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Old 11-04-2017, 06:06 PM   #1
Tom47
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Default Admiral A2 and XCT48400IQ Question

I had the max RPM set at 6000 for several days after completing my upgrade and was able to get a fairly consistent 25 MPH with 2 aboard, full windshield and 18" tires that are closer to 18 1/2" at 22 PSI.

Today I dropped the max RPM setting to 5800 as a safety measure to ensure not over revving the motor. I also dropped the tire pressure to 19.5 PSI for a better ride.

I got 24 MPH consistently today which is the speed mentioned in all sales literature. I really don't need 25 MPH, but is there any danger in keeping it at 6000 RPM for several miles?

What is the safest choice to avoid shortening the motor life?

Thanks, Tom
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Old 11-04-2017, 06:13 PM   #2
scottyb
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Default Re: Admiral A2 and XCT48400IQ Question

A tech gadget guy like you should have a temp gauge on the motor... temperature is the bottom line

http://www.buggiesgonewild.com/elect...p-exist-5.html
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Old 11-04-2017, 06:20 PM   #3
Tom47
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Default Re: Admiral A2 and XCT48400IQ Question

Quote:
Originally Posted by scottyb View Post
A tech gadget guy like you should have a temp gauge on the motor... temperature is the bottom line

http://www.buggiesgonewild.com/elect...p-exist-5.html
Yesterday after a full speed run at 6000 rpm, 5400 RPM actual, I checked the motor temp with the infrared gun. I had 132 degrees max on the red housing and 124 degrees on the aluminum end bell. What is the maximum endbell temp?

Today after a 5800, 5200 actual, run I had about the same, maybe a 1 degree lower reading on both.

Please note, these RPM's are where the controller is SET AT. Actual RPM are less by 10 % or so.

Do you think I would be OK to keep the XCT max at 6500 which is 5850 actual?

Last edited by Tom47; 11-04-2017 at 07:31 PM.. Reason: Added question
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Old 11-04-2017, 06:27 PM   #4
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Default Re: Admiral A2 and XCT48400IQ Question

Scotty, I saw where you soldered the temp probe on the motor. I may look into that in the future.

But I won't be soldering it. I'm not that brave....and I don't have rapid access to more motors!

A large hose clamp will be my choice.
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Old 11-05-2017, 08:19 AM   #5
jsmith294
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Default Re: Admiral A2 and XCT48400IQ Question

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Originally Posted by Tom47 View Post
Scotty, I saw where you soldered the temp probe on the motor. I may look into that in the future.

But I won't be soldering it. I'm not that brave....and I don't have rapid access to more motors!

A large hose clamp will be my choice.
You may want to reconsider the hose clamp idea. It could change the heat transfer characteristics at the TC enough to give you an inaccurate reading. Contact between the wires and casing may be marginal. Scotty's approach of soldering is the best way to do the installation. Good luck!
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Old 11-05-2017, 10:03 AM   #6
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Default Re: Admiral A2 and XCT48400IQ Question

Or use REAL (non tear-able) duct tape. If anything, it will give a higher reading which is a good thing in this application.
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Old 11-05-2017, 10:07 AM   #7
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Default Re: Admiral A2 and XCT48400IQ Question

I would personally avoid soldering the probes as the melting point of solder can substantially exceed the device rating, specially if you don't have the proper equipment to control the temperature or use improper technique.

If You are attaching the probe to a copper lug or ring terminal, use thermal adhesive epoxy specifically designed for the application:
https://www.amazon.com/Arctic-Silver...dp/B0087X7262/
Amazon usually stocks the smaller and cheaper 5g size, but other places sell them as well.

If You are going to attach the probe directly to the motor body, use heat resistant tape designed for the task:
https://www.amazon.com/3M-High-Tempe...dp/B00004Z4DS/

The relation between the outside temperature of a motor and the actual internal winding temperature varies depending on the motor construction and materials used, but You can safely assume anything below 250F on the outside is way below the class H rating for those motors.
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Old 11-05-2017, 01:43 PM   #8
Tom47
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Default Re: Admiral A2 and XCT48400IQ Question

Quote:
Originally Posted by Sergio View Post
I would personally avoid soldering the probes as the melting point of solder can substantially exceed the device rating, specially if you don't have the proper equipment to control the temperature or use improper technique.

If You are attaching the probe to a copper lug or ring terminal, use thermal adhesive epoxy specifically designed for the application:
https://www.amazon.com/Arctic-Silver...dp/B0087X7262/
Amazon usually stocks the smaller and cheaper 5g size, but other places sell them as well.

If You are going to attach the probe directly to the motor body, use heat resistant tape designed for the task:
https://www.amazon.com/3M-High-Tempe...dp/B00004Z4DS/

The relation between the outside temperature of a motor and the actual internal winding temperature varies depending on the motor construction and materials used, but You can safely assume anything below 250F on the outside is way below the class H rating for those motors.
This sounds like the way to go! I happen to have high temp metal foil duct tape from my days in HVAC.

The highest temp I have read is 135 degrees on the motor housing, 123 on the end bell and 105 on the XCT. This was after a 2 mile high speed run at 100% throttle, 5950 to 6020 RPM on the monitor.

Since that run, I tweaked it down to 5975 RPM.

BTW, in post # 3 I mentioned the max RPM setpoint was higher than the actual by about 10%. This was with throttle response set at 40%. I raised the throttle response to 70 % today and the setpoint was only 50 RPM above actual.

Last edited by Tom47; 11-05-2017 at 01:52 PM.. Reason: Added info
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Old 11-05-2017, 01:44 PM   #9
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Default Re: Admiral A2 and XCT48400IQ Question

Quote:
Originally Posted by Cruise Master View Post
Or use REAL (non tear-able) duct tape. If anything, it will give a higher reading which is a good thing in this application.
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