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! :)
Hi there. I'm new to motors and found this video great for my learning, it's very clear and concise. There is one thing, when the motor is at its desired speed, you said a contactor pulls in and removes the resistance on the windings in the panel. What tells this contactor to pull in? Is there a centrifugal switch or some form of switch somewhere? How does it know when to pull in?
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.
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. 😅
To be, I consider that to be an excellent idea haha! If you could just watch them enough to get me a million views then that'd be superb!! haha, just joke. Thanks very much for watching my videos :)
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.
Ooh yes I remember seeing a pump (à wastewater pump or something) like that too! If you got the sequence wrong, you blew the fuse! It was really long to start (like you first had to press a switch, then push a certain button and release the button after 20 seconds), it was very unusual to say the least. It was later ripped apart with a assembly of programmable logic controllers, now all you have to do is flick a switch and the PLC will do the rest...
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!
Me included! But it's these situations that I put myself in that means I have to research how these machines work and I too learn massives amount of stuff (probably that I didn't NEED to know haha!)
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!!
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 👍
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.
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
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.
yeah, I made a big error calling the rotor an armature! Adjusting the visuals wasn't that difficult, but then I had to re-do ALL the voiceovers and make the video match the new voice overs. Mostly the same words, but different lengths - ARGGGH added 1 day's editing!
Yes, this is something else that I learnt from this video from the comments. I'm still old-skool haha! HOWEVER, not sure that grey/black and brown would have shown up as much as red/yellow/blue does in the visuals :)
@@markh5210 I'm in North America. Working on imported machinery from Europe (German, British, and Italian,) I've seen 3ph BRN/BLK/BLU, GRY/BLK/BRN, YEL/BRN/BLK. North America is RED/BLK/BLU for lower voltages and ORG/BRN/YEL for higher voltages. Canada and the US are approximately the same, but sequencing is different.
Yes, this is something else that I learnt from this video from the comments. I'm still old-skool haha! HOWEVER, not sure that grey/black and brown would have shown up as much as red/yellow/blue does in the visuals :)
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.
yep, I made a big error calling the rotor an armature! Adjusting the visuals wasn't that difficult, but then I had to re-do ALL the voiceovers and make the video match the new voice overs. Mostly the same words, but different lengths - ARGGGH added 1 day's editing!
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! :)
@Worlds largest Culvert theatrical Poster for poltergeist 3 by chris zabriskie.
Hi there. I'm new to motors and found this video great for my learning, it's very clear and concise. There is one thing, when the motor is at its desired speed, you said a contactor pulls in and removes the resistance on the windings in the panel. What tells this contactor to pull in? Is there a centrifugal switch or some form of switch somewhere? How does it know when to pull in?
@mrmattandmrchay What type of wave is beetween the rotor phases. Is it an AC sine wave or DC wave?
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.
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. 😅
Mike i386 Great idea. His old videos can be interesting too! :-)
To be, I consider that to be an excellent idea haha! If you could just watch them enough to get me a million views then that'd be superb!! haha, just joke. Thanks very much for watching my videos :)
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.
Ooh yes I remember seeing a pump (à wastewater pump or something) like that too! If you got the sequence wrong, you blew the fuse! It was really long to start (like you first had to press a switch, then push a certain button and release the button after 20 seconds), it was very unusual to say the least.
It was later ripped apart with a assembly of programmable logic controllers, now all you have to do is flick a switch and the PLC will do the rest...
@@Alexis_du_60 @dykodesigns2yt Both very interesting comments! Yes, makes sense!
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!
Me included! But it's these situations that I put myself in that means I have to research how these machines work and I too learn massives amount of stuff (probably that I didn't NEED to know haha!)
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!!
Very well edited and explained video ! Thank you !
I am glad youtube channel like yours exist. Cheers
This video is great! Greetings from germany
Hey ein Deutscher 😂
Hey, thanks Matze!
I love your chanel because of grate interesting videos that I learn from them 😁. I'm from the UK Buckinghamshire
Cool, thanks for watching! What part of Buckinghamshire are you from? I'm in High Wycombe.
@@mrmattandmrchay Aylesbury. I thought you lived further than that.
Thank you for sharing your knowledge
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 👍
COOOOL!, Thanks for the very nice comment :)
Excellent video👏👏👏👏
Pretty nice. Thank you very much
good explanation, we love slip ring motors ;-)
thanks! :) Hope I did them some justice!
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.
That's a brilliant comment and observation!
Hai sir iam nsivaramakrishna thanks again your time with the class prasnet my role
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
Amazing , thanks a lot
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.
yeah, I made a big error calling the rotor an armature! Adjusting the visuals wasn't that difficult, but then I had to re-do ALL the voiceovers and make the video match the new voice overs. Mostly the same words, but different lengths - ARGGGH added 1 day's editing!
This video is pure gold Thanku sir 👏
wow, thanks very much for the comment :)
Great video :) do you have a picture of the slip ring? Would it need to support all the motor amps as the stator?
Thank you sir very nice, sir elevator motor - rotor and coil Replacement video can I find
NICE. TOP NOTCH AS USUAL !!!!!.
very easy to follow as well.
@@SamSitar Yes, it should be class room material. Trying to explain this without this video will take way longer and not so clear.
Cool, thanks for the comment :)
Did you manage to fix or time those relays up so they started up correctly?
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.
Nice.
thanks
Help full 🙏🙏
cool thanks.
Why is the motor not running as it should. Does a timing component need replacing?
Possibly, or an engineer not knowing what they are for had adjusted them incorrectly.
In the U.S. the three phases of power are coded black, red and blue.
Hai iam nsivaramakrishna thanks again
neat
maintain quality as well as quantity
The colours have changed in 2004 from red, yellow and blue to grey, black and brown
Yes, this is something else that I learnt from this video from the comments. I'm still old-skool haha! HOWEVER, not sure that grey/black and brown would have shown up as much as red/yellow/blue does in the visuals :)
3 Phase circuits are now coloured Brown/Black/Grey with Blue as the neutral.
Phase identification colors and sequence vary depending on supply voltage involved and the country you are in.
@@abpsd73 BBG is the current UK/EU colour scheme (replacing RYB in the UK).
MMMC is a UK based channel.
@@markh5210 I'm in North America. Working on imported machinery from Europe (German, British, and Italian,) I've seen 3ph BRN/BLK/BLU, GRY/BLK/BRN, YEL/BRN/BLK. North America is RED/BLK/BLU for lower voltages and ORG/BRN/YEL for higher voltages. Canada and the US are approximately the same, but sequencing is different.
Yes, this is something else that I learnt from this video from the comments. I'm still old-skool haha! HOWEVER, not sure that grey/black and brown would have shown up as much as red/yellow/blue does in the visuals :)
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.
1:27 it creates a rotating magnetic field, not electric field.
Waduh aku entok tugas tekok dosen tentang iki su
So the shorting is just a bypass.
yep, but bypass is more an American word. I work with electronic systems for my job and train engineers, and I always refer to it as 'shorting'.
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.
Please sir give me diagram
The only diagrams I have are shown in the video
Uploaded twice (:
yep, I made a big error calling the rotor an armature! Adjusting the visuals wasn't that difficult, but then I had to re-do ALL the voiceovers and make the video match the new voice overs. Mostly the same words, but different lengths - ARGGGH added 1 day's editing!
mrmattandmrchay oof
First
Way tooo FAST