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In Reply to: RE: Excellent - thank you both! posted by ToddM on March 28, 2015 at 20:27:37
Most definitely! Use a motor run cap. They are oil filled paper or some polymer film. Since they are in the circuit the entire time the motor is running they need to be of good quality. Non-polarized electrolytics are suitable for motor starting but not good for a motor run cap.This one should do it. The hyperlink seems to suggest 20 microfarad but it goes to a 3 microfarad.
Phil
Edits: 03/29/15Follow Ups:
the following pic is a Papst 38.09 hall effect motor. This was (and still is) a working unit, but I decided to replace the silver cap (220uf, left upper corner) based on it's advanced age.I didn't consider replacing it with a better or different cap, simply the same value.
Are you familiar with this engine?
Could I utilize a better quality cap, or a different value, to minimize vibration?
Any info you can provide on this motor is appreciated.
Edits: 03/30/15
Hi TBone,
I think that capacitor is simply a power supply filter. In this motor which is likely Hall effect brushless DC motor the timing is not controlled by capacitors. The position of the rotor is sensed by Hall sensors to switch current to the stator windings. If vibration is excessive first get it running then shut off the power. If the vibration continues as the rotor winds down it is likely unbalance. If the vibration stops with the removal of power there could be an electrical problem such as a bad driver transistor. This is going to involve getting a schematic and probing aroung with a scope. This could end up to be more effort than the motor is worth if a replacement can be found.
Phil
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