ferrick@acsu.buffalo.edu (patrick k ferrick) (09/14/90)
A little help, please!
I'm not completely clear on the operation of servomotors...I think
the basic idea is that one can remotely control the motion of a DC
motor by <somehow> changing its input electronically. I would really
appreciate a brief explanation of the concept!!
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
quite where to find out about them.
Thanks in advance,
Pat
____
/\T B\ Patrick K. Ferrick / KA2AYK | Heaven's net casts wide;
/ \E S\ ferrick@acsu.cc.buffalo.edu | Though its meshes are coarse,
\ / / 219 Computing Center | Nothing slips through.
\/___/ State University of NY at Buffalo | {Lao Tzu}hbg6@citek.mcdphx.mot.com (09/14/90)
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 ..................................................................... reply to 'from' address; hbg6@citek.mcdphx.mot.com NOT the 'sender' line address! Someday my sysadm will decide this is a 'real' problem. :-) ..................................................................... All opinions expressed are mine and not Motorolas, their loss. .....................................................................