[Inductor-Recorded Traction Motor Sound モハラジオ録音] NYC Subway R142/ R160A/R160B [Alstom IGBT-VVVF]

#モハラジオ #TractionMotorPWMSound #NYCSubway
Car Type: New York City Subway R142, R160 (R160A, R160B)
(All files in this video are from R160A.)
Traction: Alstom ONIX 2-Level IGBT-VVVF
PWM Pattern: Asynchronous
(380 Hz → 665 Hz → 1290 Hz) → (1430 Hz ⇔ 1235 Hz)
Sound Characteristics:
At least in the speed range I recorded, asynchronous PWM is used all the time. The carrier frequency changes like 380 Hz → 665 Hz → 1290 Hz in the beginning, and after that it switches between 1430 Hz ⇔ 1235 Hz according to the train speed.
When decelerating, this pattern is turned upside down. However, since it switches to the air brake completely before stopping, the sound of 380 Hz cannot be heard so often (this case is shown in the second file in this video).
Similar Alstom IGBT traction, whose carrier frequency changes discretely during the asynchronous PWM, is used for the Washington Metro 2000/3000/6000 series and the Walsaw Metro Metropolis fleets (Walsaw cars also seem to have similar frequency values).
I wonder why this pattern is adopted, and still have no idea what happens in the higher speed range.
* 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.
I wish the day to record this crazy sound will come again.
* Sorry, I am NOT taking requests for recordings.
Posted by Ebara Express
Twitter (Available in Japanese; translate please!)
/ vvvf_tokyu2000
Website "VVVF Database" (Available in Japanese; translate please!)
vvvfdatabase.starfree.jp
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/ @ebaraexpress7260

[@ebaraexpress7260]

When I remeasured the part marked 1235 Hz in the video, it seemed to be about 1240 Hz to 1245 Hz. 動画内で1235Hzと記した箇所について、もう一度測定し直したところ1240Hz～1245Hz程度のようでした。

[@TheSearleFamily123]

1240-1245Hz didn't work for me on OTOTETSU; too high pitched. So I think 1235 Hz is actually right.

[@rainbowrailroadcrossing7798]

“I listen to just about every kind of music” Me:

[@greg.anywhere]

I realized my taste in music was weird when I found myself listening to the sounds of subway propulsion systems for fun💀

[@METRO_SUBWAY]

When you step on a Lego:

[@Martimtrs]

lol

[@maxbataille778]

Lol

[@minecraft_javjavatonkoonca8109]

LoL

[@SeraphimVegito9268]

Lol

[@WCE107]

Heh.

[@OliversElevators]

I always thought these VF drives sounded so weird... I couldn't understand why they seemed to jump around between pitches, and I've never heard anything like that before! It would be cool to do the VF drive on the R160 with the Siemens propulsion - that one sounds more like a traditional IGBT drive. Cool video!

[@ebaraexpress7260]

Thanks! I still don't have any idea why Alstom set these values for the carrier freq. of this train. Wow, I'm just preparing to upload the inductor recorded R160B Siemens sound tonight, so stay tuned!

[@cablemanagement1524]

it also seems odd that the pulse mode is 100% asynchronous, could the frequency jumps have something to do with avoiding resonance/emi? also i'm sure if we knew the properties of the traction motors it would make more sense. i love this pattern though, and wish we had more information on it

[@MiketheNerdRanger]

This seems to be characteristic of Alstom drives of this period. The DC metro has a similar sound with their Alstom drives.

[@znxchngames]

1:00 and 1:22 so clean

[@youtubefan6908]

This was so well done!

[@Yonchoku_3041Yonichi_Keisei]

いい音ですね！

[@marknicholsaviationplanesp8840]

0:22 I swear if I stepped on a lego I would’ve been like this

[@Alex_Campbell_MTA]

Very nice! I’ve received mines in the mail, as well as a TRRS cable. Will hook it when I have the time.

[@ebaraexpress7260]

Great to hear that! There are many kinds of VVVF sounds around NYC, so it'll be fun to collect them.

[@Alex_Campbell_MTA]

Definitely!

[@SigmaRho2922]

Ha ha Warsaw metro Alstom metropolis 98B also has those same motors. Those trains were being designed at the same time as the R142 was being developed. A variant of those traction motors was later developed for use on the 6000 series trains of the Washington metro, which are set to be retired once the 8000 series trains are delivered.

[@davidng2336]

The 2000 and 3000 series are also being retired.

[@benjaminbrown3939]

The 6000 series may see service beyond the 8000 series introduction, though it's unlikely.

[@DigitalAndInnovation]

What a beautiful sound! 😪

[@nyc_kawasakiv8778]

Nice job, ur 100 subscriber!!!

[@user-dr1tl2ik4s]

Amazing

[@atomstarfireproductions8695]

I've always thought it sounds interesting because of the alternating carrier frequency. Does anyone know what the purpose of alternating the carrier frequency is for?

[@Bombardier2199]

THis is Amazing! Could you do either R179, or Alstom OPTONYX when the R211s come out later this year?

[@ebaraexpress7260]

I'll try them when I'm able to visit United States again.

[@TheSearleFamily123]

@@ebaraexpress7260 Luckily, someone has recorded the Bombardier MOVIA R179 already: kzbin.info/www/bejne/j5Wvi4uZaKx4jpY

[@Elect_railway]

初めまして、全域を非同期で加速するのは日本には無くてかなり新鮮ですね。 海外の鉄道は日本には無い変調をするものが多くて旅行の楽しみの1つでもありました。 使用されたモハラジオは1コイルのモノラル出力でしょうか？

[@ebaraexpress7260]

オム / 鉄道設備系CH はじめまして！ 自分も最近の海外旅行の目的は日本にない音を堪能することが大半を占めています笑 全域非同期は確かに国内では全然見当たらないですが、海外では路面電車とかでもそこそこ走っているみたいです。 センサについてはおっしゃる通りで、本当に1個のインダクタをただ4極ケーブルに繋いだだけの、L側にしか出力されないモノラル仕様です！

[@Elect_railway]

@@ebaraexpress7260 返信ありがとうございます！ 当方も4極でモハラジオを作成を試みたのですが、録音の機器はオーディオレコーダーでしょうか？ 4極のマイクとGNDにコイルを繋いだだけだとスマホはマイクを認識しなかったのでコンデンサや抵抗を接続したり工夫をしたところです。

[@ebaraexpress7260]

@@Elect_railway 自分はICレコーダーを使っています。 この方のツイートによると、iPhoneの場合はコンデンサをつなぐ必要がありそうですね、、、 twitter.com/masashi_214/status/1178188269239951366?s=20

[@Elect_railway]

@@ebaraexpress7260 情報ありがとうございます。同じ4極を使用してもスマホ特有の事象なのかもしれませんね。 引き続き動画楽しみにしています！

[@HuSerrVVVF]

Sounds really interesting, in Valencia there are also two series that have the Alstom VVVF, class 4300 and Class 464 (Civia), I hope that I can go and record them soon.

[@sobu_hasy]

Sounds pretty much like the Alstom trains in the subway system of Warsaw in Poland!

[@SigmaRho2922]

The trains in Warsaw have the air brake triggered at 1290 Hz, not 665 Hz as in New York. The motor deceleration sound goes to 600 Hz.

[@jaytv25]

At least 35% of trains are made by alstom in nyc

[@mikeythesoulace]

Seems like the R160 jumps around a lot more between 1250 and 1430 Hz compared to the R142

[@williamscoufaras7045]

Can you actually do a recording with the inductor directly off an R142 please? While the R160A and R142 sound similar, there are some noticeable differences with how long the 1,290, 1,430 and 1,235Hz sound is on the R142 compared to the R160A and I think that’s worth noting in a future video

[@ebaraexpress7260]

I also have R142 recordings, but the switching timing of 1290→1430Hz and 1430Hz→1235Hz (which in the 1st time they appear in the lower speed) are same as R160, regarding the inverter output frequency. However, one file I have had a different behavior; it seems like when the acceleration is low and there are several interruptions (coasting) occuring in the 1290Hz phase, this phase is extended for a higher speed range and skips the 1st 1430Hz and 1235Hz phase. Thanks for the suggestion that let me look back my data!

[@unitedrail-mainchannel8991]

Mate, your content is super. How do you make these sounds? Keep it up!

[@ebaraexpress7260]

Thanks! I use an inductor (100 mH), a TRRS cable, and an IC recorder. I record these sounds by putting this on a train car's floor just above its traction motor.

[@unitedrail-mainchannel8991]

@@ebaraexpress7260 Thats cool!

[@coastersaga]

@@ebaraexpress7260 How does it work? Does the inductor "listen" to the magnetic fields from the motor?

[@lirrproductions4622]

0:24 I never heard that part when I was on the train normally when 0:20 ends I just hear track noise when I ride the train

[@ebaraexpress7260]

That's because the sound caused by the PWM is almost erased by the motor's roaring sound in the higher speed range. However, if you record them by using an inductor, you can get this full PWM sound.

[@crazyboutferrets]

you should do some vids on the tube

I wonder why the carrier frequency does change so slowly. A technique which can help a lot to lower percieved noise is to change the carrier frequency a lot of times per second between two frequencies located in a different third of octave, in such a way the human hearing cannot "tune" on it which lowers the disconfort. However, doing it once every few seconds does not have any interest IMO. Would someone know what is the reason behind this solution ?

[@ajaytransitproductions]

These props are not bad if you ask me. I still prefer the Siemens however.

[@marknicholsaviationplanesp8840]

1:26 REAL LIFE

[@Ontario_Fanner]

Can you try to do R110A

[@garageauto5275]

Can you do the R211?

[@Nakayamaken.06]

日本ではあまり聞きませんがAlstom製だそう。 ONIX 2lv. IGBT

[@TheSearleFamily123]

This VVVF is also used on the Warsaw Metro Alstom Metropolis 98B! kzbin.info/www/bejne/qZ2xXqaVrMaZqMk

[@oofyalDAMMIT]

Is there a way you can convert this to midi? Maybe somehow you can recreate the noise on piano? or synth?

[@benjaminbrown3939]

Ototetsu

[@claudianedelcu2853]

0:37

[@Rtrain-yd6xl]

Can you make the part

[@hiyokokun]

チョッパみたい()

[@no_service429]

Noticed on the title there,the first thing is wrong,you said R142,not R143.

[@ebaraexpress7260]

No, it's right. R142 has this Alstom traction, while R142A and R143 have the ADtranz/Bombardier traction.

[@no_service429]

@@ebaraexpress7260 Oh ok

[@maxhemenway]

0:08

[@minecraft_javjavatonkoonca8109]

Made Warsaw 98. B

[@kenjiharima23nep91]

Just here to correct you, R142 A and B don't sound like that, only R160 A and B Do.

[@ebaraexpress7260]

The title's “(A/B)” is for only “R160”. Sorry for the misleading.

[@kenjiharima23nep91]

@@ebaraexpress7260 its OK.

[@shemarfeliz]

0:11

[@claudianedelcu2853]

0:41

[@shemarfeliz]

0:12