Hack cheap synchronous motor for single direction? 1

[mkeveney]

Hi All,

I'm new here; please direct me if this has already been answered.

I want to use one of these cheap synchronous motors (

http://i01.i.aliimg.com/photo/v0/279558351/_font_b_AC_b_font_font.jpg)

in a hobby project, but I need it to turn in a predictable direction. I understand that this style motor (with two leads only) might start in either direction, depending on where the rotor comes to rest.

Is there a way to modify the motor so it always starts in one direction? I've seen vague references to a capacitor in a few places, but not enough detail.

Thanks in advance.

-Matt

 

[iop995]

This is so-called hysteresis motor. Rotor is made by high hysteresis material and in small time from start-up catch and remain synchronous with one rotating field.

http://www.faculty.umassd.edu/xtras/catls/resources/binarydoc/3636.ppt