SILVERDRIVE phase converters

Does anyone know anything about these converters please.
I'm doing a bit of a write up for another forum (woodworking) comparing
methods of running 3 phase machines from single phase supplies. Silverdrive make things they call phase converters and yet appear to offer variable speed. They have a website under construction but don't seem to respond to emails or phone calls.
Any info about their products would be most helpful.
TIA
Bob
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Bob, Email sent.
John s.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here. All logos and trade names are the property of their respective owners.