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Electric Motor Temps, get varying temps where best to messure?

Electric Motor Temps, get varying temps where best to messure?

Old 10-15-2014, 01:52 PM
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Default Electric Motor Temps, get varying temps where best to messure?

Hey hoping to get some direction on where to take motor temp readings to monitor temps. The motor is in a 1/10 XRAY T4 USGT, Carpet, 21.5 Motor, Spur is 96, Pinion is 50.

The issue I am noticing is that when I take the temp on the back of motor around the bearing area I am seeing good temps ex. 140 to 150 but when I take temps on the side up near where the shaft comes out the temps are higher 160 to 175. The other thing is that temps taken on the back have been 2 to 3 inches straight on with digital gauge where the temps on the side are at an angle 3 to 4 inches away from area being measured. Usually I run for 6 min and check by lifting the side of the body.

I'm a newb at this and loving it. I want to take car of my motor and dial up the timing to get the most zing I can out of it as well.

Thanks in advance for any advice you share!
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Old 10-15-2014, 01:55 PM
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What temp gun are you using?
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Old 10-15-2014, 02:03 PM
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Sounds like you are right in the ballpark in terms of running temps. You won't get any kind of consistency when you measure at different areas of the motor as differences in airflow and heat dissipation will be different all around the motor.

I usually measure from 3 different spots and take the highest.
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Old 10-15-2014, 02:58 PM
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Find the hottest location on the motor. Typically the lower winding, and measure the winding temps if you can through a vent in the can.
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Old 10-15-2014, 03:34 PM
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Most of the non-contact thermometers have a "max" mode where it will record temps as long as you hold the button, then show you the highest number it gets. I just scan every part of the motor and go with that.
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Old 10-15-2014, 05:55 PM
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Originally Posted by Odin544 View Post
What temp gun are you using?
I'm using a BAFX Products Non Contact Infrared (IR) Thermometer Range of -58F to 1,022F
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Old 10-15-2014, 05:57 PM
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I plan on adding a fan / heatsink. How much cooling will typically this provide?
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Old 10-15-2014, 06:52 PM
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I run a WTF fan and my motor stays around 100-115F after 6 min on the carpet. i do have a vented endbell and i run one strip of lexan to separate the fans air to blow into one of the endbell openings. the other is the exit for the hot air. works well.
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Old 10-15-2014, 07:50 PM
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Originally Posted by dragonracing View Post
I run a WTF fan and my motor stays around 100-115F after 6 min on the carpet. i do have a vented endbell and i run one strip of lexan to separate the fans air to blow into one of the endbell openings. the other is the exit for the hot air. works well.
I'd love to see a pic of how you use the lexan to do that if it's possible
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Old 10-15-2014, 08:01 PM
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i used shoogoo to mount the fan to the lexan. then double sided taped it to the chassis. used this setup all summer. my motors got up to around 130-140 even on 90 degree days on the asphalt. simple and basic but very effective.
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Old 10-15-2014, 08:04 PM
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I have been thinking about modifying the lexan mount to more encompass the motor and vents. adding a side dam and roof to direct the airflow over the motor can.
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Old 10-15-2014, 08:36 PM
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Originally Posted by dragonracing View Post
I have been thinking about modifying the lexan mount to more encompass the motor and vents. adding a side dam and roof to direct the airflow over the motor can.
Like this?



Works great actually.
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Old 10-15-2014, 09:22 PM
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Yes sir.
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Old 10-16-2014, 05:28 AM
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When most manufactures give a temp rating, they are expecting you to measure the hottest part of the can.
Remember that if the motor can is very reflective you are aren't going to get a true reading from an infrared temp gun.

I try to get the measured temp on the inside, measured through the vent holes, then try to get the temp on the outside as similar as possible.
This means the can is conducting the heat away well.
If there is a big temp difference then you are effectively cooking the stator on the inside.
Remember, the can just holds it all together, it's the stator that gets hot.
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