On the GE LM2500 gas turbine engine, magnetic pickups are utilized for what purpose?
• Role of magnetic pickups in rotating machinery • Difference between gas generator speed and power turbine speed in a split‑shaft gas turbine like the LM2500 • Typical inputs needed to calculate engine torque on marine gas turbines
• On an LM2500, which rotating components would produce a measurable tooth or notch signal that a magnetic pickup can read? • Is torque usually measured directly by magnetic pickups, or is it typically derived from other kinds of sensors or strain measurements? • Do magnetic pickups sense rotational speed, load, temperature, or pressure?
• Confirm that magnetic pickups sense passing teeth/notches to produce a frequency signal proportional to rpm. • Distinguish clearly between gas generator (N1/Ngg) speed and power turbine (N2/Npt) speed sensing on the LM2500 layout. • Verify whether torque on this engine type is obtained from magnetic pickups or from other torque‑measuring arrangements.
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