So I'm trying to figure out how to spin a camera on a brushless gimbal motor. I am feeding each of the terminals a sinusoidal pwm signal from a via 3 half bridges on the SN754410. Each of the pwm signals is 120 degrees apart in phase.
When this signal is fed into the motor I get a kind of cogging (almost like a clock) and not smooth motion. see this https://www.youtube.com/watch?v=tDNnhxuPoEQ
I am wondering how normal gimbal drivers (for quadcopters and stuff) accomplish smooth motion. From what I understand, you can create acceleration maps with a magnetic position sensor and then do compensation (inverse and apply) to get smooth motion but it seems like those gimbal motor drivers don't use magnetic postion sensors.
How do those gimbal drivers work?