FusionJim
- 56
- 11
Long story short, I got a vacuum cleaner with a standard universal series motor inside. It also had the TRIAC pcb with a potentiometer and a triac/thyristor to control the RPM which allowed to control the suction power. Some moisture got on the pcb and it shorted. I simply took it out since I run the cleaner at max setting anyway thinking that at max setting the motor receives the mains voltage anyway. I think I was wrong because now the motor tends to overheat shortly after running. Can anyone explain how the triac board controls the universal series motor? Because judging from sound alone, the motor spins at roughly the same RPM as before yet now it overheats quickly. How do these board alter the sine wave applied to the motor to keep it cool yet running fast?