This probably won't work. I don't know enough about motors and electronics to know. I was looking at some zero crossing solid state relays. Thinking that one could be used to switch on a 1 HP single phase motor. The type with a starting winding and no caps. Then, after wiring up a VFD (Variable Frequency Drive) to a three phase motor, I got to thinking that maybe the aforementioned single phase motor could be started on 60HZ and then switched to 120 HZ. From what I've read about VFDs the voltage rises with the frequency so that at 120HZ a 115 volt motor would be supplied with 230 volts. If this is so, could a
230 volt DC supply be switched by a zero crossing SSR at 120HZ controlled by a 555 timer? What effect would the induction from the motor windings have on the SSR? Obviously the complex VFD electronics aren't just there for fun. But would the described scheme work? Well enough to get useful work from the motor? Thanks, Eric R Snow- posted
18 years ago