Change the speed of ac motor .

[nassimback]

Hi i'm new here and i'm only 2nd yeah of study of electronics....anyway i would like to know if it's possible to change the speed of an ac motor without a tachogenerator ,
just some ideas of yours to help me get inside electronic world Thanks

 

[Minder]

Depends on the type of AC motor, single phase induction motors do not control well, with the exception of small fans or motors that are shaded pole type, i.e. no capacitor.
For these a Triac Dimmer style will work.
3 phase motor do control well however with the aid of a VFD etc.
M.

 

[Minder]

Incidentally, the 3 phase motor can be driven by a 1ph supply to the VFD, usually up to around 5hp.
M.

 

[nassimback]

sorry for not precising the type of motor i have : i have a small 210watt 220v ac motor like this one
http://newimg.globalmarket.com/PicLib/440/2591440/prod/3_1351842562067_l.jpg
will the Triac Dimmer circuit work for this motor ?

 

[Bluejets]

It's a series motor...look for triac phase angle controller.

There was discussion on one of the above not so long ago ( commercially available)
Plug in unit up to around 10a load if I remember correctly.

 

[Minder]

The link does not work for me, but if in fact it is a Universal motor (has brushes) then the the triac type controller should work for it.
Google triac motor controller.
M.