Hi folks,
I have here air system fans and need to regulate them (simple induction motor with run capacitor)
Question is can I use slow speed ON/OFF modulation and what frequency is best. Control system can go up to 10Hz. But full phase control is not achievable, without external hardware, now they are connected with SSR controlled by logic signal.
At 5Hz fans run steady even at low 10% duty and make little audible switching noise but produce some shaking to mounts as they are relative strong 80W radial fans with big inertia
Noise is not a problem but I'm afraid of that vibrations can it damage motor and bearings ?