Pise tocno u onom pdf-u. Oba su mjerena. Cekaj sad cu quotati taj dio, pa da vidis sam. Kvaka je u tome da se izbaci opseg kotaca kao varijabla, ,a za to se moraju znati okretaji motora.
When the term Roller Torque is used, this means we are measuring Torque from a Load Cell that is attached in some fashion to the Retarder (Eddy Current Retarder/PAU) that is coupled to the Drive Rollers (the knurled rollers). The Retarder applies a braking force to the Rollers, and since the Retarder Frame is restrained from turning by the Load Cell, the force is transferred into the Load Cell which measures force in typically Kg or pounds force. The length of the arm the Load Cell is attached to is precisely known, so, with force over a given length, we can determine “Torque” in Nm or Ft/lbs.
Roller RPM is usually measured by an Inductive speed sensor of some type, or a Shaft Encoder, or in the old days on a Vane Dyno, a Tacho generator.
These two inputs are used by the Dynamometer Control System to calculate the Power.