Definition
An electric motor that rotates in small, fixed increments (steps) each time it receives an electrical pulse, rather than turning continuously. The motor's shaft position can be precisely controlled by counting the number of pulses sent to it, and its speed is controlled by the rate of those pulses.
Plain English
A motor that turns a tiny set amount each time it gets an electrical signal. Send it ten pulses and it moves ten little steps. This makes it very precise — you always know exactly where the shaft is.
Context Anchor
Seen in powerplant maintenance when discussing electrically controlled engine parts, position indicators, and other devices that must move to a precise setting.
Derivation
Named for how it operates — the shaft moves in discrete 'steps' rather than rotating smoothly, much like a person stepping forward one pace at a time instead of walking continuously.
Why Pilots Care
Provides accurate repeatable positioning for fuel metering and engine controls, supporting efficient operation and reliable power response.
Analogy
Think of the second hand on a quartz clock — it doesn't sweep smoothly, it ticks once per second to a known position. A stepping motor works the same way: each pulse equals one tick to a known position.
Intuition Check
Do not read “stepping” as walking or physical footsteps. Here it means the motor turns in small measured increments when electrical pulses tell it to move.
Example Sentence 1
The fuel control unit uses a stepping motor to meter fuel flow in precise increments based on signals from the engine computer.
Example Sentence 2
Technicians command the stepping motor through its full range of steps to verify smooth movement and correct positioning during maintenance.