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How to interface PIC16f877 with AC motor ( as output)

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delifadzli

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Hi everyone,,

here i would like to ask for your opinion on AC motor-PIC interface problem. I wanna ask how to interface PIC and AC motor actually..

Isn't need some sort of additional circuit between both "thing" or i would just implement relay circuit....or even transformer?? anyone...

please help
 

Hi,
Depends on what you mean by AC motor. If it's just to turn on/off the AC motor, all you need is a relay or triac and turn the relay/triac on/off accordingly.
If you mean controlling the speed, you will need something more complex, like triac phase control / triac pulse skipping / sinusoidal pwm full bridge / frequency control with triac.
Instead of triac, back to back SCRs can also be used.
Hope this helped.
Tahmid.
 

ooo.ook ...for this project my aim for the ac motor basically on controling the speed...

the situation here, the data from pic will result to what value of speed of motor

for example,, if the detection of the temperature less 20 cel will resulting slow motor speed...less rotating...

if the input medium ( btwn 20- 40 cel)... the resulting motor speed ...medium... ++ motor rotate


and last, if the input high (>>>40 cel)...much faster... motor rotate much faster...

32_1265896489.png


Added after 1 minutes:

The circuit above...isn't OK...or problem for ac motor...
 

Hi,
Take a look at these:
Code: 
en.wikipedia.org/wiki/Phase_fired_controllers
[url]www.nxp.com/documents/application_note/APPCHP6.pdf[/url]
Hope this helped.
Tahmid
 

so...ur suggestion use phase controller ... ok, i will try study on that...by the way, isn't the circuit can't be applicable...in my mind... i would like just to change the value of resistor for each of the relay..which mean the slower speed use much higher resistance...

hope for ur respond...
 

Yea, use phase controller.
About your diagram, it's quite unclear. But you shouldn't be using resistance to control speed, bad idea.
Hope this helps.
Tahmid.
 

Tahmid said:
Yea, use phase controller.
About your diagram, it's quite unclear. But you shouldn't be using resistance to control speed, bad idea.
Click to expand...

He's not wrong, do the basic maths for the power dissipation of the resistors. It'll be huge, = big resistors = expensive + lots of heat.


What kind of AC motor is this? Power requirements? three phase? part numbers?
 

Hi,
I don't think you should be doing that with the resistors. Instead use phase control or frequency control although the latter will be more difficult.
Tahmid.
 

just to ask...especially to Tahmid...

if i apply phase controller....( not study yet)...i wonder, about the code Ur give me 2 weeks ago...still can be use???
 

Hi,
You can use the temperature sense part not the PWM part, as phase controller is different from PWM.
Tahmid.
 

hi all,

i currently practice to make itself serial to parallel input/output, parallel to serial input/output but i have problem to make the address & baud rate selection? any schematic for address & baud rate?
 

hii all,

may I ask the interaction diagrams ac motor pic16f877a with a clear and complete ...

thx all
 

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