Its impressive how long the service life for these trains are considering they are the first VVVF trains! Even after refurbishment they still retain the same exact VVVF drive they were built with!
Such an interesting recording! The clip from the station is what your ears hear, and the buzzing graph is like what the electronics would hear, if they had ears that is. It almost sounds like a video game from the 80's.
Wow, great video and great description! I always wondered why the Helsinki metro almost sounds like it has a gearbox, in a way that I've never heard in metro trains elsewhere (at least in Stockholm, Sendai, London, Paris, Kyoto or Tokyo), but you finally gave me a satisfying answer! Think I need to learn more about AC power electronics!
"never to make VVVF trains again" Strömberg made other three-phase propulsion systems than the 3 trains you mention in the description: 1977- the prototype trolleybus No.121 from Winterthur 1978- the prototype trolleybus SWS from Helsinki 1980- the Finnish prototype locomotive Sv1 1981- the ZGT6/6 700 tramway from Rotterdam 1982- Winterthur trolleybus GT560/640-25 1984- the prototype trolleybus Ikarus 284T1 1987- Adelaide metro series 3000 1989- a prototype R44 subway in New York
To be exact, it should be SCRS-VVVF. SCRS=Silicon Controlled Rectifier Switch. Deutsch Wikipedia - Thyristorschalter: Ein Thyristor-Schalter für Wechselstrom, auch elektronischer Schütz genannt, besteht aus zwei antiparallel geschalteten Thyristoren oder aus einem Triac (An AC thyristor switch, also called an electronic contactor, consists of two antiparallel thyristors or a triac)
VilMatrix found a book describing the inverter's operation and passed the information to me. Calculating the pulses through the audio isn't possible at least for me.
![[Inductor-Recorded Traction Motor Sound モハラジオ録音] DART SLRV [AEG GTO-VVVF]](http://i.ytimg.com/vi/E7LzvPDTBJA/mqdefault.jpg)
Its impressive how long the service life for these trains are considering they are the first VVVF trains! Even after refurbishment they still retain the same exact VVVF drive they were built with!
Mrw the 15-pulse mode hits
Such an interesting recording! The clip from the station is what your ears hear, and the buzzing graph is like what the electronics would hear, if they had ears that is. It almost sounds like a video game from the 80's.
Would you mind sharing the unedited audio file? i would like to analyze it further to see at exactly what frequency it switches to the next pulse
anyone else notice the heartbeat like sound?
yup, i think its sounds from the train bouncing as it goes
@@randlofsI don't think it's bouncing, but some kind of interference.
Wow, great video and great description! I always wondered why the Helsinki metro almost sounds like it has a gearbox, in a way that I've never heard in metro trains elsewhere (at least in Stockholm, Sendai, London, Paris, Kyoto or Tokyo), but you finally gave me a satisfying answer! Think I need to learn more about AC power electronics!
freaking love trains floks :.D
"never to make VVVF trains again"
Strömberg made other three-phase propulsion systems than the 3 trains you mention in the description:
1977- the prototype trolleybus No.121 from Winterthur
1978- the prototype trolleybus SWS from Helsinki
1980- the Finnish prototype locomotive Sv1
1981- the ZGT6/6 700 tramway from Rotterdam
1982- Winterthur trolleybus GT560/640-25
1984- the prototype trolleybus Ikarus 284T1
1987- Adelaide metro series 3000
1989- a prototype R44 subway in New York
0:12 Sounds exactly like the SEPTA ADtranz M-4
To be exact, it should be SCRS-VVVF. SCRS=Silicon Controlled Rectifier Switch.
Deutsch Wikipedia - Thyristorschalter: Ein Thyristor-Schalter für Wechselstrom, auch elektronischer Schütz genannt, besteht aus zwei antiparallel geschalteten Thyristoren oder aus einem Triac (An AC thyristor switch, also called an electronic contactor, consists of two antiparallel thyristors or a triac)
"heard by people born in the 19th century up to the present day" Onhan niitä saattaneet 1800-luvulla syntyneet kuulla, aika vanhoja ovat kyllä olleet.
19th century on 1800-luku.
Hi, can you tell me how you made your inductor?
Hi, how did you measured the pulses? I mean in order to know how many pulses there are at each phase.
VilMatrix found a book describing the inverter's operation and passed the information to me. Calculating the pulses through the audio isn't possible at least for me.
@@bandimint Interesting....which book is it?
@@HuSerrVVVF Here, fak.mbnet.fi/kirja/ISBN_978-952-93-6959-1.pdf
It is written in Finnish though, so you need to use translator.
@@vilmatrix723 Ok, thanks
@bandimint May I know the name of the book
Re: “unmistakable” sounds - A lot of trains have similar sounding drives. The Washington DC Metro has some that sound very similar.
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