Magtrol WB Series User Manual

Contents

Magtrol WB Series User Manual Manual pdf 76 page image

66Magtrol WB/PB DynamometersChapter 4 – Connections / Conguration4.2 TANDEM DYNAMOMETER CONFIGURATIONThe tandem configuration combines the advantages of both the WB Eddy-current and PB magneticpowder dynamometers by coupling them in series.USBPCM-TESTClutch(EK)DSP7002DynamometerControllerTransformerPowder BrakeDynamometer (PB)ExcitationTorqueDES Power SupplyTSC 401Torque/SpeedConditionerEddy-Current BrakeDynamometer (WB)ExcitationTorqueTSC 401Torque-SpeedConditionerDES Power SupplySpeedFigure 4–3 Tandem ConfigurationIn tandem, the unique features of each type of dynamometer brake are utilized, allowing nominalbraking torque to be applied to the unit under test from zero speed to maximum rotation. Eachdynamometer (WB and PB) can also autonomously operate according to its own characteristics.Tandem Dynamometers are available on a number of PB/WB combinations. Refer to the correspondingdata sheets in Section 1.2 for speed and torque ratings of each tandem configuration.Note: The parametrization of the tandem dynamometers is quitecomplicated. In order to get the maximum torque and to be able touse the system at its fullest capacity, a complete Magtrol measuringchain (as illustrated in Figure 4–3) is required.4.2.1 electromAgnetic clutchTo couple both dynamometers together in a tandem configuration, a toothed electromagnetic clutchis required. This clutch is delivered as standard with all Magtrol tandem dynamometers.When the speed of the PB Dynamometer is at zero, the electromagnetic clutch is engaged. Conversely,the clutch disengages when the PB Dynamometer has reached its maximum speed. This functionis automatic when a Magtrol DSP Controller is used. (See Note in Section 4.2.)