r/Motors

Looking for some help.

I’m an HVAC tech working on a heat recovery ventilator.

Intake and exhaust fans motors both have worn rubber rings that mount onto the resilient motor base. The wobble was so bad it actually ruined the shaft on one of the intake blower assembly.

I took them to a motor shop but he can’t find the part # for the rubber ring. I’d hate to have to scrap 2 functional motors over a small piece of rubber, so I’m hoping someone here can help me find replacement rings.

I operated this servo motor at 8v and full speed for 5 or 10 minutes before it gave up. I moved it constantly 10 times with 2 second breaks after each 10x cycle of movement. And I moved the servo around 90 degrees each movement back and forth with some weight on the end of it.

The current drawn from the servo was around 4-6amp during those movements.

The gears are now locked at 5-10 degrees movement even with the motor removed entirely. The motor wires also burnt as you can see in the image and probably shorted destroying the motor? Im not sure.

I haven't tested the motor yet separately but the servo doesnt move at all so motor is probably damaged but unsure why the gears are stuck in this 5 degree angle. Is this common? I got the dsservo 25kg pro version.

UPDATE: one of the gears is stripped. Need to find a stronger servo possibly and reduce the voltage slighly or get brushless as they produce less heat I heard

Motor is a Louis Allis 1/3 HP, explosion proof motor. Came from Brown Forman Distillery. Our shop was going to repair before Brown Forman said to drop it and go with a new system.

Does this look familiar to anyone?

There’s 6 leads total. The 2 longer ones on the right go to the centrifugal switch. The other 2 pairs go to the main terminals that accept the wires from the power cable. Each of the 2 switch wires show continuity with one of the wires going to a terminal, but the other 2 wires do not show continuity with any other wire. Can someone explain the wiring to me? Why are there two wires that aren’t showing continuity with anything right now? This motor works great btw, I’m just trying to understand how the wiring works in this type of induction motor. Thank you for your help, I am new to this stuff but really want to learn.

This one came to me in the same purchase as my prior post.

From what I can gather it’s most likely 24v 10,000rpm 24mmx54mm with a 3mm drive shaft. The 54mm length can be shorter and the 24mm diameter can be narrower. I can also machine the shaft down if needed.

OEM manufacturer won’t reply to my emails, they only sell to other manufacturers.

I'm trying to reduce audible noise from an air quality sensor. A little 20x20x10mm dc fan is being variably driven with pwm. It has an inherent small whine, probably being driven in the low 10s of kHz or having sidelobes there. It's mounted on a plastic plate, so this vibration ends up amplified and shifted to be a persistent hum. Photos included of the assembly.

What is the usual approach isolating noise? It's a cheap component so swapping to a better bearing is fine, but I'd rather just cut a gasket under the fan and screws, or between the sensor box and its mount on the plate. I have already tried a gasket under the fan with some fiber I had on hand, but it's not a suitable material and vibration was not reduced.

I'm down for electronics modifications. I could add some reactance, but I cannot change how the motor is being driven as this is driven by a black box.

Thoughts and advice appreciated, have a nice day.

Hello all! We are thinking of recreating this setup for a kind of slider with maybe a stepper motor and belt drive? This mechanism is used by concertlab studio, it moves the camera on a track allowing it to swing overhead. Was thinking of DIY ways of engineer or build something similar?

Gotta have this guy rewired. What are the pros and cons of 115v and 230v? It's for the fan in the pictures, if that makes a difference.

Video

I have a 545 DC motor which I'm running on a 5 volt 4 Amps charger it keeps doing this

I recently purchased an old lathe, the motor is 3 phase but in my home shop of course I only have single phase. I will post my motors spec sheet. (1st and 2nd pic)

Automation direct recommended the following VFD (3rd pic) which could provide up to 5 Horsepower (HP) given my motor. But my concern is that my lathe was sold with a 3 HP motor. I have the following questions that hopefully someone smarter than me can answer!

Can my motor be configured to run at 3HP given the specs?

Is it smart to run my lathe with a 5HP motor when it was sold with only a 3HP?

Is it worth it to convert my lathe to a single phase motor or is purchasing an addon VFD to run my big motor worth it?

Is this VFD good for my motor?

Thank you for any and all advice in advance I really do appreciate it <3