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Black:
Blue:
Dashed Blue:
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Pull-in torque
Pull-out torque
Power
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Pull-In Torque: the maximum torque at which a synchronous motor (stepping motor included) can accelerate its load to synchronous speed.
Pull-Out Torque: the maximum torque which a synchronous motor (stepping motor included) can develop and still maintain synchronous speed.
Full-Load Torque: the torque developed by a non-synchronous motor at its rated full-load speed.
Breakdown Torque: the
maximum torque that the motor can develop; it occurs as a point on the
speed-torque curve below synchronous or full-load speed.
Locked-Rotor Torque: the torque developed with the rotor at standstill.
Holding or Static Torque
(Stepping Motor): the torque required to displace the rotor from its
equilibrium position with one or more stator phases energized with the
rotor at rest.
Detent or Residual Torque
(Permanent Magnet Motor): the torque developed in an unenergized motor
when the permanent magnet rotor is displaced from a position of minimum
stator eluctance.
( from http://www.myhurst.com/hurstmfg/technical.jsp?image=4)
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