Quote:
Originally Posted by snowyskiesau
Mental,
I've done a bit of browsing on some CNC/machining forums and was given some recommendations.
As I said previously, the most common use of a VFD is to drive a 3 phase motor from a single phase supply. (having 3 phase power installed is expensive!). There are however a number of low power VFD's (1/4, or 1/2 HP) available for use where voltage and/or frequency control (motor speed) are required. Prices for these are around the $200 - $300 mark. Perhaps cheaper on eBay although I couldn't see any single phase units listed.
The VFD's are programmable for voltage/frequency either via a built in keypad or in some cases via an RS485 controller.
Here's one supplier of a number of different brands. Hitachi and Danross were both given thumbs up in response to my queries.
DIsclaimer: These are mains voltage devices and need to be installed in a suitable enclosure and wired up by a licensed electrician. |
Most VFD's output a PWM generated sin wave, not a pure sin wave as in mains power. Not too sure of your telescope electronics would cope too well with that..
One could build your own fairly easily with an adjustable sin wave generator, linear transistor amplifier and a small mains transformer.
What voltage is required by the drive motor?
Cheers
Lee