MaxHeadRoom
- Joined Jul 18, 2013
- 28,619
A universal motor is series connected field so the field would have to be reversed in order to run in reverse on AC or DC.
Max.
Max.
Yes, this is true; there is a jog of the drive belt at both pulleys when either of the two outside steps are used. The middle step of the 3-step pulley is directly above the driver pulley on the motor shaft, and that means that the two outside steps are not. Now, I'm trying to decide if the stepped pulley is worth keeping, and if it is, to find a way to keep it aligned with the driver pulley, no matter which step is used.Your belt drive appears to be driving at an angle to the pulley rather than truly perpendicular to each shaft?
I did not know about these, had never heard of them. Thank you. I used epoxy to hold these steel ball bearings in place. Epoxy works well. It's not a very easy bond to break. I wonder how I'm going to get these bearings out to replace them? Maybe I won't. The loudest noise coming from this machine now is the sound of the flyer arms cutting through the air.Also an issue if you want quieter running is to replace the ball bearings with bronze Oilite sleeve bearings, these are traditionally much quieter.
Max.
What I'm finding is that Oilite was developed in the 30s, is about 20% SAE 30 motor oil by weight due to it's porosity, a characteristic that can be damaged or destroyed by using any but the sharpest cutting tools to machine it. What I'm not finding is how it might replace the sealed ball bearings I'm currently using.bronze Oilite sleeve bearings
Max.
In reading about Oilite since you introduced me to it last evening, I concur with your appraisal of it for this application, but I have another project, currently on the back burner pending a different way to approach it for which it seems perfectly suited. Bearings do make noise, and I would love to find an alternative if a reasonable one exists...but the bore in the bearing is so precise in it's match to the OD of the aluminum tube that there is no slippage, and therefore, no friction between the bearing, and the shaft.Looking at the application again, Oilite may not be the best alternative if the shaft is aluminum as I am not sure about the friction characteristics between the two?
Unless it is relatively low rpm.
BTW, a nice resource for components is Misumi, the huge (free) catalogue is worth it just for a reference book.
Max.
I have no experiience with RC motors, but my understanding is they require alot of power and alot of cooling, they appear to be designed for short - very high current operation.Those brushless DC motors made for RC airplanes seem increasingly interesting to me, but I'm not finding much applicable data to help me narrow down the field. .
I've seen the phrase constant torque a couple of times in the last couple of days, and the association with winding seems strong, but now that I'm looking for such a motor, I'm not able to find anything small enough. I am seeing a lot of permanent magnet motors, but they seem to be DC. What brings you to making this particular suggestion; do you have something specific in mind? Your suggestion of an AC motor also has my attention, but why AC?Belaboring the point, constant torque ac motor seems perfect for your winding operation.