The torque illustrated
in these torque curves is known as pull out torque, the
maximum torque that can be applied to the rotating shaft of a
stepping motor at a given pulse rate, under specified drive conditions,
without missing steps.
The torques are
for half step operation (400 steps/rev).
Torques are approximate and slight statistical variation may
occur between individual motors and drives.
Stepper motors can run upto 3000 rpm, although this should be
for intermittent periods. Running at speeds in excess of 2000
rpm for more than one hour will cause the motor to overheat,
possibly demagnetising the rotor.
The torque curves do not take into account the effects of the
inertia ratio (load/motor) which should be between 1:1 and 5:1.
The parallel mode is the recommended connection. When using parallel
mode, set the drive current to no more than the bipolar motor
rated current. If using series mode, set the drive current to
half the bipolar motor rated current. H series motors only have
4 leads so they cannot be connected in series mode.
are shown in the torque curves, however, this is a guide only.
The torque may vary from different drive models.
are also on back of SD stepper motor brochures.
Motion Systems for torques outside this range.