I'm going to pin my own comment here just to say... some of these comments are so interesting. You know what, it doesn't seem to matter how long I research these videos to make them as accurate as possible, there is ALWAYS more to learn and you guys open my eyes to things that I didn't know. The only problem is, I have to upload a video to learn these things! If only I could reverse time and learn these things before I design the video for upload! Impossible, but thanks for the valued comments you've added here. I'm hoping that everyone is benefiting including me! :)

The sequence is actually correct. For this setup the time the resistors need to be in circuit is extremely short, less than 1 second. This is common in small (yes, this IS a small one) AC motors which are used for inching (i.e. repeated starting and stopping) as is commonplace in this lift when someone is lining up a floor. The starter in this case is not there to provide more torque but provided to limit the initial stalled inrush current in order to comply with the supply authority regulations. Yeh the time could be a little longer but it's clearly working correctly in this configuration. As soon as the rotor moves it's no longer stalled and so its fine to go straight to DOL operation which provides plenty of torque through the geared drive.

The motor design reminds me of the wood working machines that we had at school in the workshop. They ran at 415 volts and you couldn’t let them run at full speed from a cold start. They all had a special start up and turn off sequence where there was a third state on the on/off dial. If you turned them on too quickly, the circuit breaker / fuse box would trip. Every machine had it’s own fusebox as well.

I know it has nothing to do with this particularly video but since we are / I’m in quarantine, I’m doing a mrmattandmrchay marathon, rewatching all your videos to get the time by. 😅

Thank you for this easy to understand video. I have never known the workings of a slip ring motor before because I've never needed to. Now my education is complete!

This video is great! Greetings from germany

I am glad youtube channel like yours exist. Cheers

I know 9/10 of naff all about lifts. I know roughly how motors work so, there's that. But you clearly conveyed the use of slip ring motors, how they operate, their advantages and show them in action. I love these videos because of their quality and this one is no exception. Looking forward to the next one 👍

I love your chanel because of grate interesting videos that I learn from them 😁. I'm from the UK Buckinghamshire

Being a motor is essentially a rotating transformer, increasing the resistance of the rotor windings (adding the starting resistors) decreases the current of the stator windings. Once the motor is rotating, removing the resistance provides the motor to run at rated power and torque.

Excellent video👏👏👏👏

this was so interesting to watch! Im learning about electro motors in my studies, but hard a hard time visualising what was going on. This was a perfect help! Great explanation!!

Hai sir iam nsivaramakrishna thanks again your time with the class prasnet my role

first the video was private the other day and I'm like dammit! I check again now I'm like whoohoo! can you make a playlist of the motor rooms? that's the best part of your videos.

good explanation, we love slip ring motors ;-)

Very well edited and explained video ! Thank you !

NICE. TOP NOTCH AS USUAL !!!!!.

This video is pure gold Thanku sir 👏

Thank you for sharing your knowledge

Pretty nice. Thank you very much

Why is the motor not running as it should. Does a timing component need replacing?

Hai iam nsivaramakrishna thanks again

Nice.

In the U.S. the three phases of power are coded black, red and blue.

Amazing , thanks a lot

3 Phase circuits are now coloured Brown/Black/Grey with Blue as the neutral.

The colours have changed in 2004 from red, yellow and blue to grey, black and brown

Do best transition time from resistance connection to shorting coils depends on motor size/power or resistances or both? I appreciate the time you put into sharing this knowledge

maintain quality as well as quantity

Thank you sir very nice, sir elevator motor - rotor and coil Replacement video can I find

Did you manage to fix or time those relays up so they started up correctly?

Great video! But there is an inaccuracy: the rotor speed NEVER catches up with the synchronous speed and the difference between rotor speed and synchronous speed is called "slip", which makes the rotating magnetic field of the stator sweep round and round through the surface of the rotor, induce electromotive force to let electric current flowing in the rotor circuit. If the rotor rotates at synchronous speed, NO torque is created, because there is NO electromotive force and NO current through the rotor circuit.

Help full 🙏🙏

These windings are in delta, how can the stopping jerk is maintained in these machine special in up travel with balance load, is there roll back felt.

neat

1:27 it creates a rotating magnetic field, not electric field.

Great video :) do you have a picture of the slip ring? Would it need to support all the motor amps as the stator?

Waduh aku entok tugas tekok dosen tentang iki su

So the shorting is just a bypass.

Only star-delta and autotransformer starters work with slip-ring motors. VFDs and soft starters don't work

Interesting technology. Not really relevant nowadays as most elevators use either a VFD or simple two speed motors.

Uploaded twice (:

First

Please sir give me diagram

Way tooo FAST