Synchro And Resolver Engineering Handbook Moog Inc May 2026

The most revered section was always the troubleshooting guide. “Synchro system hunting?” the handbook would ask. “Check velocity damping. Increase tachometer gain or add a lead network.” “Null voltage too high?” “Verify orthogonality of stator windings.” It was diagnostic jazz, not simple checklists.

The Synchro and Resolver Engineering Handbook is not just a manual. It is a monument to the era when feedback was analog, when noise was a physical force to be grappled with, and when a company like Moog could build a lasting reputation not just on the hardware it sold, but on the knowledge it freely shared. Synchro And Resolver Engineering Handbook Moog Inc

This is the story of that handbook, the technology it champions, and why, in an age of digital abundance, its principles remain utterly indispensable. To understand the handbook, one must first understand the components at its heart. A synchro is, in essence, a rotary transformer. It looks like a small, precision motor but behaves like an analog computer. When you rotate its rotor, it outputs a set of three voltages (or receives them) that encode the exact angular position of a shaft. No glass disks, no LEDs, no fragile optics—just copper windings and a magnetic field. The most revered section was always the troubleshooting

Moog’s handbook didn’t just explain what they were; it explained how to weaponize them . It provided the transfer functions, the Scott-T transformer connections to convert three-wire synchro data to two-wire resolver data, and the critical error budgets that separate a functioning radar dish from a gimbal lock in an inertial navigation system. The handbook emerged from a specific historical cauldron: the Cold War aerospace boom of the 1960s. Moog, founded by William C. Moog (whose brother, “Bill” Moog, invented the Moog synthesizer—a neat footnote of analog genius running in the family), was already the leader in high-performance servovalves. Increase tachometer gain or add a lead network

Consider a Mars rover. Temperatures swing from -120°C to +20°C. An optical encoder’s glass disk would shatter; its LED would dim. A resolver? It’s just copper and magnetic steel. It keeps working. Consider a wind turbine’s pitch control. The nacelle vibrates with brutal low-frequency energy. An encoder’s bearings would fret and fail. A resolver, with no optical components, brushes, or active electronics, survives. Consider the main engine nozzle of a SpaceX Falcon 9. The gimbal actuators move through extreme vibration, radiation, and vacuum. Resolvers are the feedback device of choice.