What is the advantage of a current regulated power supply?
A. As a magnetic particle clutch or brake heats up during normal operation, the resistance of the copper in the coil can increase by 30%. Because clutch or brake torque is proportional to current, a constant current is required to provide constant torque. If only the voltage is regulated, the current will drop as the coil resistance increases; therefore, using a voltage regulated power supply will result in unwanted changes in web tension. Using a current regulated amplifier to control a magnetic particle clutch or brake will provide consistent torque output and more precise control of tension.
