What is a cogging?

Cogging is pulsating output torque. Cogging occurs after input current is greatly reduced, while the shaft is at zero or very low RPM. Placid's hysteresis brake feature the patented 'Cog-Buster', which automatically decogs (stops the brake from cogging) in 1 revolution of the shaft. Hysteresis brakes without the 'Cog-Buster' must be manually decogged. To manually decog: Rotate the shaft while simultaneously reducing the input current from the previous high current to zero. This is quite inconvenient, or impossible if the brake is located remotely.  more