Schaeffler MF-Generator-2.5-10kW Manual Del Usuario página 12

The number of windings/turns depends on the size, shape and
material of the workpiece.
A workpiece large in diameter generally needs less turns than a
workpiece with smaller diameter.
To determine if the number of windings is optimal, we advise to
start somewhere between 5 – 8 turns.
Magnetic holders can be used as aids to keep the windings in
place during the heating process.
The coupling in below example is used to explain how to make the
most optimal number of turns. In this example we start with 8 turns.
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■ The next step is to connect the inductor to the generator.
■ Make sure the power of the generator is set on maximum.
Depending on the heater type this is 10kW, 22kW or 44kW.
■ Press start and let the generator run shortly.
■ Read the actual power in the display of the heater.
■ Stop the heating process.
Actual power on MF-Generator-2.5
There are several possibilities now:
1. The actual power is near the max power (10, 22 or 44kW) 
number of turns are optimal.
2. The actual power is much lower than the max power e.g. only
15kW  most likely the number of turns on the workpiece is
too high, remove one turn and check the actual power again in
the display.
■ If the actual power has increased than indeed the number
of turns was too high. Repeat these steps till actual power is
approximately the max power of the generator.
■ If the actual power has decreased, then the number of turns
was already too low and became even lower. Generator is
automatically limiting power in this case because otherwise
currents in inductor become too high. Put extra turns on the
workpiece till actual power is approximately the max power
of the generator.
■ To heat a piece more evenly the turns can/must be
spread over the work piece. Leaving space between turns
is therefore allowed. This might be of influence of the
power so it might be necessary to ad or remove a winding
according above steps.
Schaeffler Technologies