[Inductor-Recorded Traction Motor Sound モハラジオ録音] CTA 5000 Series [Bombardier IGBT-VVVF]
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- เผยแพร่เมื่อ 3 ต.ค. 2024
- #モハラジオ #TractionMotorPWMSound #CTA
Car Type: CTA (Chicago L) 5000 Series
Traction: Bombardier MITRAC 2-Level IGBT-VVVF
PWM Pattern:
Asynchronous (Speed Estimating? Part → 675 Hz) → 21P → Advanced PWM (2 Steps) → 3P → 1P
Sound Characteristics:
Immediately after startup, the carrier frequency changes in a very short time (1440Hz → 780Hz → 675Hz). This kind of behavior is often seen in vehicles equipped with traction systems made by other manufacturers that estimate speed by sensorless control, but it is characteristic that this vehicle also switches to 1440Hz just before it totally stops.
After the carrier frequency reaches 675Hz, this frequency is held for a while until it switches to synchronous modes. When accelerating, it smoothly transitions to the next 21 pulse mode, but when decelerating, this part does not seem to connect smoothly. In addition, as far as I could tell, there was no change in the sequence of synchronous modes.
The AC traction PWM sound shown in this video is recorded by a sensor which is placed on the floor of a train car near its traction motor. This sensor is made by myself just using a 100mH inductor.
Due to the resolution of the spectrogram software, the frequency displayed in this video may include some error. Thank you for your understanding.
This sound is recorded in March 2019.
Sorry, I am NOT taking requests for recordings.
Posted by Ebara Express
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vvvfdatabase.st...
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![[Inductor-Recorded Traction Motor Sound モハラジオ録音] 700-7000 Series Shinkansen](http://i.ytimg.com/vi/Ldh1x92VjPg/mqdefault.jpg)
This sounds strikingly similar to the R179 motors as well... almost as if it’s nearly the same motor.
they do have the same motor but it is slighty more different
The motors are the same but sounds slightly different only because the R179 is way heavier than the 5000 series
Actually the modulation pattern is Async(1440Hz→780Hz→675Hz)→Sync 21P→15P→9P→5P(Center Pulse [CPn])→5P(Edge Pulse [EPn])→3P→1P.
Very nice!, closest thing you have to the TR's here in Toronto! they also use MITRAC IGBT-VVVF!, cool to hear it recorded this way.
Am I the only one who hears that it sounds similar to the R179?
you are not alone
The same IGBT-VVVF sounds is also used by the Bombardier subway trains in my (former) home city of Bucharest, in Romania!
Nice one! Greetings from Chicago!
I hear a lot of interference from the third rail section breaks, even though this train was made from stainless steel.
sound of Malaysia's MRT Putrajaya Line because its new line!
I didnt even know these trains sounded like this I thought it only had the beginning sound like patco trains
That's because PATCO's system is DC chopper, but CTA 5000 uses PWM for converting DC to 3 phase AC.
@@ebaraexpress7260 And if your supply voltage is AC, it'll almost certainly be single-phase so it must be converted to DC first, and even if you have a 3-phase AC supply voltage, that voltage will almost certainly be too high to power the motor, so again: regardless of how many phases you have, all AC railway voltages must be converted to DC before the VVVF inverter can make an artificial AC wave.
Can you get one for the CTA 7000 series too?
Can you do the Breda A650 of the LA Metro B and D lines?
Is the Class 373 at all possible? I believe the end coaches have powered bogies, but there's a whole engine room. Otherwise, here's some other ideas: Class 707 and NS VIRM.
Class 373 would be OK, but Class 707 would be difficult because they have aluminum bodies. I couldn't get to the information about whether the NS VIRM cars have aluminum bodies.
@@ebaraexpress7260 I did a bit of digging around and you right, there isn't much information on the VIRM. But based on some other trains construction I am guessing it's some form of steel.
Can you try R142A/R188/R143 sound next?
Ebara doesn’t take requests...
th-cam.com/video/I8WXGLEt6BY/w-d-xo.html th-cam.com/video/dTILIhPkUvo/w-d-xo.html
0:08 | 1:45
Can I ask you a question. Can you possibly try to get the 1800 series MBTA Red line next?
Much appreciated
What equipment do you use to record these? I do not think you are using just a regular field recorder with how little noise is picked up. I have been wondering for a while on how to recreate some of these sounds in studio because of how interesting some of them can get.
In particular, I have been browsing around for a good recording of the E231 series propulsion; I think that train sounds super cool with the airy quality of its power up sound. Shame that JRE is replacing their propulsion equipment to something that sounds too much like the E233 series. The one on the VVVF database sounds super distorted, unfortunately, or perhaps that may be due to how I perceive it versus listening to an ambient recording.
I connected an inductor (100 mH) to a TRRS cable adapter, then I inserted a TRRS cable which is connected to an IC recorder.
I record these sounds by putting this on a train car's floor just above its traction motor.
The collected sounds are caused by the PWM signal, so it might sound more distorted than the sound we usually hear from the motor.
Subway of chicago
What software do you use the visualize the frequencies?
It's wavetone.
ackiesound.ifdef.jp/download.html#wt
Current version supports language change to English.😁
R179 motor
Can you do the ACS-64
So basically, he places a device on the floor of the train, therefore it would be quite difficult to record it unless he can get access to the locomotive.
@@graythewolf6096 He recorded the loco's sound from the next passenger car, so I cannot say that's impossible. th-cam.com/video/C4AFn6MjvL4/w-d-xo.html
Well, I don't know when I can go to the east coast for the next time.
@@ebaraexpress7260 I see
@@ebaraexpress7260 Speaking of electric locomotives with AC motors, here is the Taiwan Railways E1000 push-pull Tze-chiang (GEC Alsthom GTO-VVVF) in moha radio form: th-cam.com/video/Kao2vHdYhM0/w-d-xo.html (NOTE: Due to the air brake there is no deceleration sounds.)
they make a noise?
um obviously
Anything with less than 100% efficiency will make noise.
oh... but its pretty quiet over chicago noises
hard to tell