I want to design a 3 phase cyclo-converter to run a 7.5kW induction motor. The input to the cyclo-converter is 50Hz AC and the output of the cyclo-converter should be 60Hz AC.

What are the specific ratings of thyristors for designing the above?

  • 2
    \$\begingroup\$ "Hz" not "hz". Why not buy a 3 phase motor speed controller? \$\endgroup\$
    – Andy aka
    Apr 7, 2015 at 10:20
  • \$\begingroup\$ Why not just use a frequency drive? it can vary the Hz, 50/60. \$\endgroup\$
    – user71847
    Apr 9, 2015 at 4:04

1 Answer 1


As per Wikipedia's page on cycloconverters, firstly they are only used for producing a lower frequency. Secondly, they are only financially sensible at megawatt powers.

As for thyristors' ratings, they will be in their respective datasheets.

A Google search for "50Hz to 60Hz" gives a plethora of options for achieving what you want. There are plenty of off-the-shelf solutions as well as cheaper home-brew methods.


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