When I was a kid, I connected a small DC motor to the speaker terminals on a radio and made a very inefficient speaker. If I touched the drive shaft to a surface, I could hear the radio. It worked quite well touching a glass window.
Modern inverter are better in making real sine waves therefore they make less noise and are more efficient. A low power equivalent are stepper motor drivers. Some people played songs on printer or even floppy drives with that.
Here in Portugal we have fairly recent trains that make a similar noise, IF i'm not mistaken they are made by Siemens-Bombardier however is well muffled and is hard to tell if it the same type of frequencies.
When braking, energy is returned to the inverter capacitor. Which can explode. Therefore, for safety, this energy must be dissipated using a brake chopper or returned to the electrical network.
When I first heard a video of that train I was like this is the coolest thing Ive seen (or should I say heard)...safe to say whoever the engineers were, they were also musicians! Also side note you can kinda tell the technology is older cause there are so many "steps" in the acceleration/deceleration even after the singing part...one of the more modern versions of this idea, the NYC R160B with Siemens IGBT has smoother sounding acceleration (but it also has only a single 400Hz "note" in the low speed area so I totally get it if you don't think it's as cool) Im not sure if this is just me but the acceleration on the R160B makes it sound a lot faster than it is
actually, the reason for the switching frequency change even though it is an induction motor is to control the losses during startup and very high slip conditions
Nice! I live in Austria and I'm used to the sound of the "Taurus" locomotives which is similar, though if I recall correctly, the musically sounding sequence is shorter than in the trains you showed.
for the 100th anniversary of the ÖBB (Österreichischhe Bundesbahn - Austrias train company), they controlled the inverters of some trains, so that the trains played Happy Birthday
The reason for this sound should be something about magnetic field and efficiency at extremely low RPM. Nissan Leaf has stall protection, that if motor is hardly turning it will not use regular high frequency swithcing and will downgrade for lower one, more heard, but more efficient and less heat output at low rpm.
I would like more in depht explanation of circuit, with schematic. Just 2 to 5 minutes. For example, this is PWM generator, this is mosfet driver etc. With wave forms explained.
I've seen an elastomer used as heatsink compound. It was white and had a silicon texture. Can the stator not be vacuum molded with this compound instead of epoxy, or just being wrapped with twine? Wouldn't that make the motor almost silent?
In here trains sing as well but not so nicely :D in other hand its pretty loud and i can hear it in my house when i have opened winodows and that about 1Km
The reason the motor steps through pitch is because the controller sends different higher frequencies to start the motor spinning. Think of it like PWM. If you went full send the motor would burn out due to stall torque/rotor failure.
I have so many questions ;) Did You use snubbers? How about dead time? Is Your driver use bootstraping cap to switch on High side of inverter bridge or isolated circuit ? I did some PMSM inverter with Space Vector Control drive system on TMS320F28335 what was interesting that this motor need starting sequence due I was using incremental encoder - so magnetic field position was unknown on start
yeah, but you only get constant voltage and constant frequency. Those inverters are often referred as VVVF (Variable Voltage and Variable Frequency). You change the voltage to control the torque and change the frequency to control (and match) the motor speed. By just applying constant voltage and constant frequency, you will consume too much power on startup and missing some performance since the motor cannot go faster than the applied frequency and cannot achieve peak mechanical power output.
The engineers choosing sounds that are musical notes is an elegant touch. Thank you both for the video and the translation.
Those were added only as a deliberate easter egg. On some models it was removed later in a firmware update, unfortunately.
Our subway trains still use 400 Hz for something. I love this sound especially when two sources form a binaural wave. It reminds me old good days...
A very good example for a do re mi fa inverter is the Siemens "TAURUS" train used by the Austrian ÖBB train company
When I was a kid, I connected a small DC motor to the speaker terminals on a radio and made a very inefficient speaker. If I touched the drive shaft to a surface, I could hear the radio. It worked quite well touching a glass window.
Siemens still do this,in their IC trains
Modern inverter are better in making real sine waves therefore they make less noise and are more efficient. A low power equivalent are stepper motor drivers. Some people played songs on printer or even floppy drives with that.
It took a moment to realize that the name of the inverter comes from the “do re me fa so la ti do” tool for teaching music.
You can hear similar sound in Busan Metro Green Line (2nd line) in Korea, but it just ramps up and down like a sawtooth wave.
This is nuts! Reminds me so much how our RC planes works!
Yep very similar except with permanent magnet motors rather than induction motors
Here in Portugal we have fairly recent trains that make a similar noise, IF i'm not mistaken they are made by Siemens-Bombardier however is well muffled and is hard to tell if it the same type of frequencies.
Since Poland is like two decades behind on train tech we go them like few years ago. I like how they sound.
When braking, energy is returned to the inverter capacitor. Which can explode. Therefore, for safety, this energy must be dissipated using a brake chopper or returned to the electrical network.
I was always curious about the sounds that TAURUS locomotives make, now I understand.
Thanks for the time dedicated to the experiment.
When I first heard a video of that train I was like this is the coolest thing Ive seen (or should I say heard)...safe to say whoever the engineers were, they were also musicians!
Also side note you can kinda tell the technology is older cause there are so many "steps" in the acceleration/deceleration even after the singing part...one of the more modern versions of this idea, the NYC R160B with Siemens IGBT has smoother sounding acceleration (but it also has only a single 400Hz "note" in the low speed area so I totally get it if you don't think it's as cool)
Im not sure if this is just me but the acceleration on the R160B makes it sound a lot faster than it is
actually, the reason for the switching frequency change even though it is an induction motor is to control the losses during startup and very high slip conditions
My friend, the SIEMENS Eurosprint "TAURUS" locomotives use a doremifa inverter and are still in operation in Germany and Austria.
Nice! I live in Austria and I'm used to the sound of the "Taurus" locomotives which is similar, though if I recall correctly, the musically sounding sequence is shorter than in the trains you showed.
It could've been meant as a soft start for the engines, either to prevent wear or to prevent load on the electrical network.
Japan is Master of all things Trains, from small scale train sets to full scale national transportation.
for the 100th anniversary of the ÖBB (Österreichischhe Bundesbahn - Austrias train company), they controlled the inverters of some trains, so that the trains played Happy Birthday
Thank you for the video! Greetings from 1520 rail gauge in Russia
As an engineer and music lover, I assure you that the frequencies were not chosen coincidentally 😂
12:05 It sounds like overclocking a car
The reason for this sound should be something about magnetic field and efficiency at extremely low RPM. Nissan Leaf has stall protection, that if motor is hardly turning it will not use regular high frequency swithcing and will downgrade for lower one, more heard, but more efficient and less heat output at low rpm.
I would like more in depht explanation of circuit, with schematic. Just 2 to 5 minutes. For example, this is PWM generator, this is mosfet driver etc. With wave forms explained.
Excelente trabajo 👍🏻
Saludos cordiales desde Argentina 🇦🇷
Thanks ❤
please feature more interesting electronics
It sounds like it is changing gears.
I am assuming that this is all accomplished via pulse width modulation.
Well done sir.
Heard this in Densha de d - Out of Sight.
There's some disagreement between musicians about what frequencies certain notes should be, especially the A and B notes
Now built this type inverter for an old drill. Because my old drill would also make funny sounds like this. Until the nicd batteries died
A cordless, brushless drill motor does practically exactly the same.
You should publish the circuit and code that you used
do you have a japanese voiced channel? with your original voice
Maywa Denki would like a word with you :p
I've seen an elastomer used as heatsink compound.
It was white and had a silicon texture.
Can the stator not be vacuum molded with this compound instead of epoxy, or just being wrapped with twine?
Wouldn't that make the motor almost silent?
The principle is the same as the loudspeaker and the buzzer
now the train cars make sounds of tentacle grape
respekt
In here trains sing as well but not so nicely :D in other hand its pretty loud and i can hear it in my house when i have opened winodows and that about 1Km
Did you run the fan on 115 or 230 volt?
is there a tentacle inverter
The reason the motor steps through pitch is because the controller sends different higher frequencies to start the motor spinning. Think of it like PWM. If you went full send the motor would burn out due to stall torque/rotor failure.
wow
Envíanos un diagrama del circuito de potencia
Hi Denki! Connect by MIDI controller e play some musics
hello, i would love to do this as a college project, can you give me some schematics or something ?
What is the type of the disassembled motor on your table?
Looks like a Nissan leaf motor
Hello what is name of switch
In Finland we have the first VVVF trains in our metro: th-cam.com/video/e3QwhuecbC4/w-d-xo.html . It's not very musical but it is very distinctive.
Oscilloscope !
No schematics or code :(
I could make a monster belt grinder with that motor set up 👍
I have so many questions ;) Did You use snubbers? How about dead time? Is Your driver use bootstraping cap to switch on High side of inverter bridge or isolated circuit ? I did some PMSM inverter with Space Vector Control drive system on TMS320F28335 what was interesting that this motor need starting sequence due I was using incremental encoder - so magnetic field position was unknown on start
It looks like there are six independent insulated DC/DC converters
meanwhile i can just plug the motor into my wallsocket and get 3phase without inverters.
because you are getting AC power from the power socket!!!
yeah, but you only get constant voltage and constant frequency. Those inverters are often referred as VVVF (Variable Voltage and Variable Frequency). You change the voltage to control the torque and change the frequency to control (and match) the motor speed. By just applying constant voltage and constant frequency, you will consume too much power on startup and missing some performance since the motor cannot go faster than the applied frequency and cannot achieve peak mechanical power output.
AI sound？
AI voice over? This is not good. We like your sound. It sounds not natural
the voice is not in sync.
What is the code used?
we should call them cables, not wires, that connect the inverter to the motors.
this format sucks. i prefer first person pov.
Luckily nobody asked you