[Inductor-recorded traction motor sound] Helsinki Metro M100 (Strömberg SCR-VVVF)
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- Опубліковано 5 лют 2025
- This is it - the finale of the trilogy that's called the Helsinki Metro. The M100 is the first series-produced VVVF train in the world, and Strömberg nailed it on the first try, never to make VVVF trains again, apart from a small batch of Dr 16 diesel-electric locomotives and a single prototype VL 86F locomotive for the Soviet market. Nowadays the Strömberg heritage brand is owned by ABB - which still has its VF manufacturing and development in Pitäjänmäki, Helsinki.
Besides the back-then-cutting-edge technology, the train body is made entirely of aluminium by Valmet Airplane Factory in Tampere, Finland. The trains are wonderfully simple and provide a smooth ride, with a tiny jolt when braking during shifting from 15-pulse mode to 23-pulse mode. Many of the parts, including the doors, are picked from buses made during the 1970s and are wonderfully nostalgic. The train is liked by drivers, passengers and maintenance personnel alike.
The M100 is renowned for the unmistakable sounds it produces when accelerating and decelerating, heard by people born in the 19th century up to the present day. The AC drives being SCR-VVVF has been confirmed from multiple sources, including a former technician of Strömberg.
Unfortunately the aluminium body made the train very difficult to record. There was one spot on the floor where my inductor microphone could pick up anything besides static. The previous one was recorded with the inductor on the window and it picked up way too much additional sounds. The recording is still not perfect, but it was the best I could do. It has been amplified nearly +24 dB and a slight amount of the highest tones, mostly hiss, has been cut with an equalizer.
The 10-step PWM pattern is as follows (thanks to VilMatrix):
43P - 31P - 23P - 15P - 11P - 9P - 7P - 5P - 3P - 1P
Technical specifications:
Top speed 100 km/h (electronically limited to 90 km/h, 80 km/h under normal operation)
Weight: 63.2 tons
Length: 44 200 mm
Width: 3 200 mm
Height: 3 600 mm
Wheel arrangement: Bo'Bo+Bo'Bo'
AC drives: SCR-VVVF (Strömberg Asynchronous Motor Inverter = SAMI)
Motors: 4x Strömberg HXUR/E 505G2 per car, 125 kW each
Input voltage 750 VDC
The first VVVF train series in the world
Numbered 101 - 184, prototype units 101 - 106 withdrawn from service; 39 units (19 trainsets) still in operation.
Originally built 1977 - 1984
Refurbished 2004 - 2009 (Talgo Oy / Transtech)
Undergoing second refurbishment 2019 - 2023 (VR FleetCare)
Service life expected until 2031
Recorded from unit 141.
Photo credits:
commons.wikime..., Helsinki City Museum
Other photos by me
![[Test of inductor-recorded traction motor sound] Helsinki Metro M100 (Strömberg SCR-VVVF)](http://i.ytimg.com/vi/P8xoa_9bEgI/mqdefault.jpg)
![[Test of inductor-recorded traction motor sound] Helsinki Metro M100 (Strömberg SCR-VVVF)](/img/tr.png)
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!
Valmet made better trains than any other company.
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
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
Mrw the 15-pulse mode hits
freaking love trains floks :.D
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.
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)
0:12 Sounds exactly like the SEPTA ADtranz M-4
Hi, can you tell me how you made your inductor?
"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, 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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