🚀 go-pugleaf

In article <36004@eerie.acsu.Buffalo.EDU> ferrick@acsu.buffalo.edu (patrick k ferrick) writes:
>motor by <somehow> changing its input electronically. I would really
>appreciate a brief explanation of the concept!!

OK, this will be brief; You have a motor. The output shaft is connected
to a potentiometer aranged as a voltage divider, therefore, moving the
shaft of the motor changes the voltage from the pot/voltage divider.
This is the FEEDBACK voltage. This voltage is applied to a circuit that
will compare the feedback voltage, some input voltage, and drive the
motor. The circuit essentially moves the motor until the feedback voltage
equals the input voltage. In a radio control system, there is usually
additional circuitry to convert pulse width signals to the DC control
voltage for the servo system. Also, servo systems can get the feedback
from shaft speed, air flow, sound level, temperature, or any other
parameter which can be measured. Your furnace/thermostat combination
is a crude servo system. Cruise control on a car is a servo system.

(OK! So I left out hysteresis, error amplification, and a bunch of other
 stuff but the request said brief.)

>
>OK. Can anyone out there point me toward information on IC servo
>controllers?  I have heard that such things exist but I don't know
>

MOTOROLA part number MC33030.

direct drive of DC motor to 1 amp, requires only reference input and
feedback voltage, neat chip. Call Motorola literature center at
(602)994-6561. Ask for a data sheet. Might be able to get a "LINEAR
AND INTERFACE INTEGRATED CIRCUITS" data book with the right title
and company name :-)

John

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reply to 'from' address; hbg6@citek.mcdphx.mot.com
NOT the 'sender' line address!
Someday my sysadm will decide this is a 'real' problem. :-)
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All opinions expressed are mine and not Motorolas, their loss.
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