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Like the PWM power supply and the SCR voltage controller a variac gives you variable output power so you can adjust the speed of a DC motor such as those found in a treadmill. Just like the SCR this power supply requires the use of a bridge rectifier. This unit seams to have a lot of advantages but I wonder if there is a significant loss of torque at lower RPMs.
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Variable Transformer:
Variable transformer with 130 max volts amzn.to/3RdWxyh
100 amp Bridge rectifier amzn.to/40DjWg6
Emergency stop switch amzn.to/43mgveT
3PDT direction switch amzn.to/3ZShNLG
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Toroid Core for AC inductor/choke amzn.to/3QTk5Zs
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