Motor magnets strength measured

Recently saw a post in a Mini 4WD group TAMIYA田宮四驅車情報站 on FB about measuring magnet strength using the “Compass” App. I am not sure how this can be done with the compass app but we did use a Magnetometer App to do some measurements before. We tested 9 motors: Stock double shaft (PRO), Rev Tuned 2 PRO, Torque Tuned 2 PRO, Atomic Tuned 2 PRO, Light Dash PRO, Hyper Dash PRO, Mach Dash PRO, Power Dash and Ultra Dash. We placed the motor around the phone sensor until we got a maximum value. The unit for magnetic strength is Tesla (T). We were measuring in micro Tesla (µT). We normalised the result with the background magnetic noise. Please note, we haven’t calibrated the app nor checked the accuracy. So the result might be off, but it should give a good indication. Here is what we found:

– Power Dash and Hyper Dash PRO have the strongest magnets, but only just.

– Torque Tuned, Atomic Tuned, Light Dash and Mach Dash all seems to use similar magnets.

– Rev Tuned magnets are only a little bit stronger than Stock

– The “high rev” motors e.g. Rev Tuned and Ultra Dash seem to use weaker magnets. So does it mean (high torque – strong magnet, high rev – weak magnet)?

What do you think? What do you take away from these results? Please share your comments below.

Magnetometer App

https://apps.apple.com/us/app/magnetometer/id1662997574

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