Anyone taken a cheap servo motor apart?

[AlZilla]

I have an inexpensive, generic servo motor that got damaged in transit. The seller credited it back and told me to keep it.

Once the replacement gets here, I'll get it off the machine and take it apart.

The motor works but rattles and thumps. The tighter the belt, the louder. I'm thinking a damaged front bearing (the damage was a very hard shot to the pulley area that drove it through the styrofoam and cardboard).

Also, how interchangeable are the control boxes? The wiring and pinouts of every one I've had my hands on is the same. I'm thinking maybe a higher rated box, say 750 watts, might be ok running a 550 watt motor?

[dikman]

Regarding the control box if it's the same brand and the menus/settings are the same then there's a pretty good chance they will be interchangeable. The motor, being cast alloy, may have a broken bit of the housing inside?

[Cumberland Highpower]

2 hours ago, AlZilla said:

I have an inexpensive, generic servo motor that got damaged in transit. The seller credited it back and told me to keep it.

Once the replacement gets here, I'll get it off the machine and take it apart.

The motor works but rattles and thumps. The tighter the belt, the louder. I'm thinking a damaged front bearing (the damage was a very hard shot to the pulley area that drove it through the styrofoam and cardboard).

Also, how interchangeable are the control boxes? The wiring and pinouts of every one I've had my hands on is the same. I'm thinking maybe a higher rated box, say 750 watts, might be ok running a 550 watt motor?

Sounds like a bent shaft, but could be a bent pulley as well? I doubt it a bad bearing though.  A damaged bearing would make a rumble or a bit of vibration from the brinelling caused by the impact but that's about it.

Edited 16 hours ago by Cumberland Highpower

[AlZilla]

Hmm... I'm anxious to take it apart. The pulley doesn't wobble. I'm surprised nobody has taken one apart but I can't find anything online. Yet.

A week or two, I guess.

[Cumberland Highpower]

Just a thought, but if your pulley doesn't wobble and the shaft appears to have no runout, is your belt having a bad section?   Just thinking of all options.

[chuck123wapati]

14 hours ago, AlZilla said:

I have an inexpensive, generic servo motor that got damaged in transit. The seller credited it back and told me to keep it.

Once the replacement gets here, I'll get it off the machine and take it apart.

The motor works but rattles and thumps. The tighter the belt, the louder. I'm thinking a damaged front bearing (the damage was a very hard shot to the pulley area that drove it through the styrofoam and cardboard).

Also, how interchangeable are the control boxes? The wiring and pinouts of every one I've had my hands on is the same. I'm thinking maybe a higher rated box, say 750 watts, might be ok running a 550 watt motor?

i've seen electric motors break the fan blades located in the rear of the housing They make quite a racket sometimes, i dont know if your motor has one. the blades are usually plastic and can come loose or break.

[AlZilla]

4 hours ago, Cumberland Highpower said:

Just a thought, but if your pulley doesn't wobble and the shaft appears to have no runout, is your belt having a bad section?   Just thinking of all options.

No, definitely not a belt. It makes a small winding/grinding sound with no belt. A belt makes it worse and more tension increases the noise.

To @chuck123wapati's point about the fan, even if it isn't a bad fan, I'm going to dig up a small 5 VDC computer fan, point it into the motor housing and plug it in to the LED socket on the control box. One thing consistently said about these things is that they make heat at  low speeds, exacerbated by the fact that the fan is running slowly. That should be easily solved.