Asking for a friend who is intending on setting up a one-off, custom-built appliance for a farm. He needs a motor and control scheme for "rotary impact cleaning". It should be:
- Low-cost (insofar as that's possible)
- Accuracy and efficiency do not matter whatsoever, direction doesn't really matter either
- Three-phase is unavailable so he's stuck with 110VAC single-phase
- Has rudimentary speed control - either continuous or multi-setting
- Is "reasonably powerful", perhaps 500W
- Can handle unpredictable mechanical load
- Target RPM up to perhaps 300 RPM
Commonly-available used parts are preferred if possible, but new parts are not ruled out completely. Custom circuitry is fine if needed.
I've seen controllers for sale that convert a single-phase supply to a lines controlling a three-phase motor, and that's OK in principle, but these controllers were somewhat expensive.
My questions are:
- What kind of control scheme (phase or inverter control, etc.) is appropriate here?
- Are there any common types of appliances or automotive systems, etc. viable as used sources for such a system?
- Failing used parts, what category of new parts should I be looking at - motors with integrated speed control, or a separate controller, etc.