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The
first component is the computer or PLC. This is the brains
behind the system. The computer not only control the step
motor system but will also control the rest of the machine.
It might raise an elevator or advance a conveyor. It can be
as sophisticated as a PC or PLC or as simple as an operator
push button.
The second
portion is the indexer or PLC card. This tells the step motor
what to do. It will output the correct number of pulses that
motor will move and alters the frequency so the motor will
accelerate, run at a speed, and then decelerate. |
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This could be
a separate component like the ORIENTAL MOTOR SG8030 indexer or a
pulse generator card that slides into a PLC. The form is immaterial,
but it must be present for the motor to move.
The next four
boxes make up the motor driver. The logic for phase control takes
the pulses from the indexer and determines which phase of the motor
should be energized. The phases must be energized in a particular
sequence, and the logic for phase control takes care of this. The
logic power supply is a low level supply that powers the ICs in
the driver. It depends on the chip set or application design, but
most logic supplies are in the 5 volt range. The motor power supply
is the supply voltage to power the motor. This voltage level is
usually in the 24 VDC range but can be much higher. Finally, the
power amplifier is the transistor set that allows current to energize
the phases. These are continuously turned on and off to move the
motor through its correct sequence.
All of these
components will instruct the motor to move the load. The load may
be a lead screw, a disk, or a conveyor.
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