Variac as a Treadmill Motor Power Supply Is this Another Budget Option to Power a Treadmill Motor?

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.

Amazon link to a Variac

This is the rectifier I am using

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