Electromagnetic cluthes

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Hi,
HAve anyone knowlegde about electronic circuit to control a electromagnetic clutches, i describe,
I had a electric motor and coupled the electromagnetic clutches, this clutches is controlled by a electronic circuit that have an anolog input (0 to 10V) , have an pulse input sensding by a sensor that read the output speed of the clutches and last have an DC output (0 to 320 V DC) to the electromagnetic clutches coil, the input supply is 220V AC.
Zero.