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stepping mode with LED indication for the active
phase. The unit may also be operated by a
microprocessor kit for which a built-in interfacing
and automatic changeover has been provided.
It may be seen that this is a complete experiment
set and not a microprocessor kit with an ADD-ON
card and a motor.
An exhaustive literature is supplied with the unit
explaining in details the theory of stepper motors,
procedure for conducting the experiments and
interpretation of the results. The details of
application software are also included.
With the rapid advancement in digital electronics,
the stepper motor by virtue of its being a direct
digital actuator, has become an important element
of a control system. Well known applications
include watches, floppy and hard disk drives,
printers etc. This experimental set-up aims at
providing an exposure to the basic operation of a
stepper motor, its drive and logic, and limitations
as far as the internal dynamics is concerned.
Experiments have been designed to demonstrate
the effect of external load – inertial and frictional,
on the motor performance. Provisions are available
for free running operation as well as single
Experiments
• Study of manual stepping through push button
switch - it would enable the student to
appreciate one to one correspondence between
the number of steps and shaft movement. A
360° calibrated dial is used for the measurement
of step angle
• Study of speed and direction control logic by
recording the pulse sequence for both clockwise
and counter clockwise motions
• Study of resonance effect at various speeds - it
provides an idea of the dynamic behaviour of
the motors
• Display and measurement of the dynamic
characteristics of the motor...