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The Basics of Motor Performance

Various symbols and units are used to indicate motor performance.

List of terms on motor performance

Term Symbol Unit
Input P W
Output P W
Maximum output Pmax. W
Voltage V V
Current I A
No-load current I0 A
Stall current Is A
Efficiency (*1) η %
Maximum efficiency ηmax. %
Speed N r/min(*2)
No-load speed N0 r/min
Torque T mN·m, g·cm
Stall torque Ts mN·m, g·cm
  1. It indicates what percentage of the electric energy applied to the motor is used effectively as the mechanical energy.
  2. It means "revolutions per minute".