lecky mortor

This topic has 5 replies, 5 voices, and was last updated 22 March 2017 at 10:43 by Ian P.

Viewing 6 posts - 1 through 6 (of 6 total)

Author

Posts
21 March 2017 at 20:54 #25151
kevin beevers
Participant
@kevinbeevers61752
Advert

21 March 2017 at 20:54 #289953
kevin beevers
Participant
@kevinbeevers61752
evening

i have just been on the bay and saw these (sorry dont know how to link stuff)but here is new silent digital energy saving servo motor for industrial sewing machine 3/4 hp iten no 142313344848 thought it may be of some interest to yo electronics chaps

kevin
22 March 2017 at 03:21 #289979
Pero
Participant
@pero
I am not certain if this is the same item but there are lots of industrial sewing machine servo motors complete with servo drive, speed control and digital readout available on Aliexpress (no I don't own the company – pity really – just a frequent shopper). I have one sitting on my unused equipment shelf but I can't give any information on its performance as it is 'unused'. However, given that industrial sewing machines are generally designed to do at least 8 hours per day I assume they should be suitable for small machinery – at least that was my thinking when I bought it.

On a related note there are also domestic sewing machine motors available with higher ratings than the typical motors. The one I have (again unused) is rated at 180W. As the power consumption is stated to be 0.9A at 220V = 198W I assume the 180W is the output power, or so one might be led to believe. As these motors are in a standard sewing machine type package I am not sure how some of the power quoted for these motors is achieved – heavier windings perhaps? They also come complete with a foot operated speed control – already binned due to poor quality. The motor seems ok though.

Cheers Pero
22 March 2017 at 08:00 #289985
Michael Gilligan
Participant
@michaelgilligan61133
One of our forum members [Bazyle, I think it was] posted some positive comments about such motors.

MichaelG.
22 March 2017 at 09:45 #290004
Russell Eberhardt
Participant
@russelleberhardt48058
Why would anyone need a servo motor for a sewing machine? I suspect that is a normal brushless DC motor with speed controller. As such it looks to be useful.

Russell
22 March 2017 at 10:43 #290016
Ian P
Participant
@ianp
Posted by Russell Eberhardt on 22/03/2017 09:45:27:

Why would anyone need a servo motor for a sewing machine? I suspect that is a normal brushless DC motor with speed controller. As such it looks to be useful.

Russell

Given a choice I would have servomotors on all (well most) motorised equipment!

Servo motors do exactly what they are told, they can know the exact position of the rotor during every rotation, change speed several times within the same revolution (if you want it to), produce maximum torque from standstill and lots of other useful controllable features. Hardly any of these features are normally needed to drive, say a lathe or a disk sander but for a sewing machine the fact that the needle responds faithfully to the foot pedal allows the operator to do both very intricate or delicate work that would be much harder to do if the motor was just controlled by a variable resistor.

As it happens (because I have a spare servomotor) it is fitted on a cheap Chinese 4" wide belt linisher and I have been pleasantly surprised by how much more useful the linisher is now. It can move the belt at 1m a week if I wanted it to, but at really low speed the linisher can be used like a very fine controllable file. Changing the speed also means the belt can be run at the optimum for the job in hand so even a very coarse grit can produce a fine finish if its run fast enough with light pressure.

Ia P
Author

Posts