servo motor startup speed

[Uwe]

I made a short demo video showing the 100rpm startup speed on my Adler 30-1 and Juki LS-341 using the 1500 watt servo motors I source on Alibaba.com. They cost around $150 each shipped to the US (minimum order quantity is 4).

 

I’m not trying to sell these motors, just giving a demo of the motor that works for my needs. 

 

https://youtu.be/4Uc7uEdmcK4
 

 

 

Edited September 16, 2023 by Uwe

[Uwe]

Just trying to embed the video in the post …

https://www.youtube.com/watch?v=4Uc7uEdmcK4

Hmmm, not sure why I can’t do this right now.

 

Edited September 17, 2023 by Uwe

[Tastech]

Very informative video Uwe . Is that a 45mm pulley on the motor ? That Adler runs at a perfect speed for doing shoe repairs 

You say you have 4 motors . The next time you fit one of the motors could you please make a video of how you installed the needle positioner .

[shelr1]

I purchased a 6" OD 1/2" bore pulley from Amazon,  22.20 including tax. 

[kgg]

Here is Uwe's video @Uwe.

kgg

 

 

Edited September 17, 2023 by kgg

[fibersport]

There have been many good comments on my original question.  After doing more research and actual testing, it seems that my biggest problem is the ramp up speed of my Goldstar servo motor.  With that said, I'm really leaning towards just replacing it with a better motor.  The two that seem to be popular are the Consew CSM550 (or equivalent) and the Reliable 6000sm (or equivalent).  I know Wizcrafts has the analog type motor and Uwe has the digital type and I value both of their knowledge and opinions.  The price is minimal between the two types although the digital model can use a needle positioner, which might be a nice option but not required.  Brush wear is not an issue for me as I would probably never wear a set out.  I guess my question really is which one has a slower ramp up speed?  

[Constabulary]

Or add a speed reducer. That slows down the speed when you start sewing and increases torque. I have speed reducers on all my machines. I have digital servos and stepper motors (you don´t have them in the US AFAIK or at least they are not wide spread). On my side of the pond (Germany) they are called "Anlasser Motor".

Speed reducers add a lot of comfort IMO.

Just my 2 cents.

Forum search for speed reducer via Google - just to give you an idea

https://www.google.com/search?client=firefox-b-d&q=speed+reducer+site%3Aleatherworker.net%2Fforum

Edited September 20, 2023 by Constabulary

[fibersport]

Thanks Constabulary but I already built a speed reducer.  It does bring the overall speed down nicely but it's the ramp up speed that I'm looking to slow down.  My current motor starts at about 500 rpm, I have brought the machine rotation down to about 100 rpm which is nice and slow but it literally goes from 0 to 100 with no ramp up.  My current motor also has a digital control so unless it can be reprogrammed, there is no way I can adjust the start up speed.  One other thing, using a speed reducer means I can't use a needle positioner due to the rpm differences of the different pulleys involved - although not having one isn't that big of an issue with me.  I'm just trying to see if there is a difference in ramp up speed between the two motors that I think I've narrowed things down to.

[Quade]

Quote

 After doing more research and actual testing, it seems that my biggest problem is the ramp up speed of my Goldstar servo motor. 

Did it come with a table you bought from them?  I got a machine from them last week with table and the servo is pretty cheeseball.  While it's the same design as the "Consew" I recently bought, the consew is an altogether better motor. 

You can reduce the start speed of this motor by programming the box. The default start speed is 200.  It's functional but I am planning on switching to a smaller pulley for now.  

Quote

The two that seem to be popular are the Consew CSM550 (or equivalent) 

https://www.amazon.com/gp/product/B07Z7F6W79/

I have this on one table. Pretty happy with it. Better than the one that came with the new machine. 

[fibersport]

No it didn't.  I bought it some years back to upgrade from a clutch motor on my old Singer.  I'm really hesitating to buy another digital controlled motor that looks a lot like what I already have.  From what I'm reading, the Reliable motor is a 12 coil motor which should give me better start up torque and what looks like a stronger physical designed motor.  It seems the Reliable and the Sailrite are the same motors except for price.  The brush motor that Wizcrafts talks about looks like its a tried and true motor, just more old school in terms of servo motors.  Those reasons are why I'm looking to find someone that has one of these motors, to basically compare actual experiences rather than just reading about them.