7
\$\begingroup\$

I want to use a triac controlled by a suitable optoisolator such as a MOC3020 to switch a single phase AC motor on and off, like the ones you'd find in a typical desk fan or a blender or similar.

I don't want speed control... just on or off.

I've used triacs in the past to switch resistive loads, which have worked with no problems.

Is there anything special or different I need to do to switch an inductive load? Do I need to include any kind of protection or noise suppression? If so what additional components are needed, and how are they implemented?

\$\endgroup\$
  • \$\begingroup\$ This issue has been dealt with before here. Pages 6 & 7 of the fairchild datasheet refer to inductive loads. \$\endgroup\$ – MikeJ-UK May 25 '11 at 14:55
3
\$\begingroup\$

A 3-quadrant triac is well-suited for inductive loads like a motor. It is resistant to spurious turn-on caused by sudden \$\frac{dv}{dt}\$ - like the inductive kick from a motor.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.