Turntable motor drive using Odrive

Projects
1

I’m evaluating the use of an Odrive micro together with a BLDC motor to drive (at the rim) the turntable platter.
The required speed is about 150rpm (or circa 2.6 r/s) for turning the platter at 33.33rpm
The motor is a 24V, NEMA 34 size, with internal rotor and about 30W, so pretty low power.

It’s running smoothly but the speed control isn’t as precise as I would like. There’s about ±0.04 r/s of variation around the set speed.
I’m going to try another motor with an external rotor (like those tipically used in drones) as I believe they have less cogging, which might improve the speed control.

Any ideas ?

2

Usually the encoder is the main factor in your achievable position or velocity precision. Any cogging torque can be compensated with anticogging. What encoder are you using?