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Use for questions regarding brushless DC motors.
3
votes
Accepted
What props for a 2207 2750KV motor?
Things like this are something that is usually only determined empirically, i.e. by trying and seeing what happens. That said, it is unlikely that you will cause damage to your motors by putting too h …
8
votes
Accepted
What does BEC, SBEC, UBEC, and OPTO mean for brushless motor ESCs?
This is an understandably confusing topic because of how the names evolved, and some of those acronyms have become more of a marketing label rather than an actual term. So I'm going to dive a bit deep …
1
vote
How should one chose the correct motor KV for a build?
The basic formula by which you determine (at least the ballpark of) the desirable motor KV is:
KV * Battery Voltage/2 = characteristic RPM (for the prop size)
Basically, what you want is for the mo …
9
votes
Accepted
Can I run two motors off of one ESC?
Technically, you could connect 2 motors, and it will probably work if they're exactly the same size and model, and have identical props on them. However, if the motor-prop combinations are sufficientl …
6
votes
Accepted
Effect of motor load on ESC?
The primary thing that high torques affect in a brushless motor is the current flowing through. It obviously affects your ESCs, but also the motors themselves: high currents have been known to melt/bu …
10
votes
What happens if i select the wrong number of motor poles in BetaFlight?
This is a setting that is needed for RPM sensing and RPM filtering. An ESC can not sense the RPM of your motors directly, but can sense how often the magnets in the motor bell pass by the coils in its …
15
votes
6
answers
956
views
How does one hold the motor bell still when tightening prop nuts?
Almost all of the brushless motors used in hobby-grade multirotors have a single threaded shaft and rely only on friction between the propeller and motor to keep the prop from slipping. This means tha …
5
votes
How does one hold the motor bell still when tightening prop nuts?
There are commercially-available tools that are designed to grab around the bell using a rubber band, like this one:
However I felt that it's a fair bit too expensive for what it is.
So I made my …