How can I run two brushless DC motors at simultaneous RPM?
Specs:
Model: PROPDRIVE v2 5050 580KV
KV: 580KV
Max current: 90A
ESC: 100A
Cell count: 4s~6s LiPo
Bolt holes: 25mm
Bolt thread: M4
Shaft: 6mm
Connectors: 4mm Bullet
Weight: 331g
I’m powering the motors with two 22.2 Volt 5.0 Amp Lipo batteries, with two electronic speed controllers. They operate under a heavy load. I think running one electronic speed controller to the two motors could smoke the ESC.
I need two of these motors to move at the same speed, around 3000 rpm. I have digital tachometers with Hall switches to monitor the rpm. I would like the accuracy to be within one RPM. Please advise.
Thanks,
Jeffrey
Hi @jeffrey ,
The RPM of the motors would be ideally determined by the pulse width of the ESC drive signal to the controllers. Although brushless motors are a bit more accurate than regular brushed motors as far as RPM, they most likely would still have RPM differences do to startup hesitation (cogging) and load factors. Are these motors connected directly to one drive mechanism such as a gear, or is each motor independent of the load?
Using sensored brushless motors will definitely provide more identical RPM. If you power two identical sensored motors (same winding, KV rating, etc.), under identical conditions they should theoretically spin at the same RPM when unloaded or when applied to the same exact load. The majority of the problem comes into play if each motor sustains a different load.
Hello Ryan,
Each motor is independent with the same independent load. I will research sensored brushless motors. Thank you for the advice!
Jeffrey
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