Hitachi IGBT VVVF | Class 465 Traction Sound | PWM Inverter - Class 465 Inductor Recording

[@gapthemind--mindthegap8524]

The mixture of induction recording with IRL makes this SO much better!!

[@gapthemind--mindthegap8524]

Not gonna lie. By far this is the best sounding induction recording for me. That sync mode sound epic and so does thw distorted nature of the hitachi modulation before it enters sync mode

[@gapthemind--mindthegap8524]

Its cute how you could hear the little desiro city igbt in the distance. "Wee wee wee wee" lol

[@ItsYa165]

I have two 1H coils. 1H is comparatively a lot compared to what most people choose because cars tend to be skinned fully of aluminium. Aluminium is a good conductor which should make it good at transmitting flux, but its material smoothness and density and count of delocalised electrons makes it an even better reflector - shielding the interior from the inverter, the stator leads, and the motor... but never the transformer (it has too much current to be blocked). The 1H coil lets me get around this as it is more sensitive than 100mH. The disadvantage is that flux from hundreds of meters away is gained. In the Tube recordings, you can hear trains which are 2 stations away. And in the Cl465/2/9 recording, you can hear Desiros which have long passed the train. Other people use maybe 3H or higher to try and detect what little flux may pass through the TIC and the car body directly. However, I have scaled the floor of a Class 710 where the TIC was fitted and could not pick anything up. I also tried for the stator leads and by the doors. I think there is simply too much aluminium in the floor or that I would need maybe 5H or more to be able to pick anything up through inches of metal.

[@gapthemind--mindthegap8524]

Best 90s gearbox sound on trains imo. If only 365s and met cams had similar gearboxes theyd sound just as loud.

[@ItsYa165]

If you listen from the 3P-W3P-1P part of the natural sound section of the Cl465/2/9 video, you will be able to tell which noise is the sync mode and which is the gearbox. You will quickly realise that the gearbox is actually really loud on the Class 365 and 465/2/9. I've played the switch from 3P to 1P back multiple times and you can hear that 3P and 1P are audible but quiet and also not at an aligned frequency with the gearbox (because that's what reduction is for).

[@gapthemind--mindthegap8524]

@ItsYa165 what i mean is the met cam and 365 gearboxes arent as "out there" with gearbox ambiance as the BREL class 465s gearboxes. The class 365 gearboxes are quitest out of entire 3. But i get what you mean generally

[@gapthemind--mindthegap8524]

@@ItsYa165 also what i mean is if brush or BREL produced the gearboxes fir a class 365, Then you may have had a better sounding traction sound , as the 365s gearboxes made by alstom (if they were made by alstom that is) The 365s were rather quiet after 50mph all you really heard was the motor humming after. The 465 BRELs gearboxes are VERY pronounced. The only difference is the 465 BREL gearbox sound was more apparent and Clear. But it seems alstom made the entire, if not most of the 365s traction systems including the gearbox, which was much quieter by comparison to the BREL/ABB 465s. That was what i was saying. Sp if 365s had a BRUSH/BREL built Gearbox adapted from the 465s, the 365s may have sound better at higher speeds. Hope that makes sensem and im only brigning this hypothetical because. 1.BREL built the 365s body shell meaning hypothetically BRUSH traction could have also been selected as they did for the 465s. 2. 365s gearbox seem to sound very similar to a class 465 BRELs gearbox frequencies. Or the noises blended together similar in sound. The difference here being that 365s hit 100mph and the 465s gearbox spools up faster to hit 75mph.

[@Anonymoususer_8823]

The Hitachi traction motors on the Southeastern Class 465 do sound similar to the Class 395 Javelins that were built by Hitachi. Whilst the other Class 465s have the old Brush traction motors that do sound identical to the Class 466 and Class 365.

[@gapthemind--mindthegap8524]

The motors are the original BRUSH style, probably modified , but the igbt has been modified or changed. One of the two id say.

[@ItsYa165]

The Class 465/0/1 have the Brush Traction motors. The Class 465/2/9 and Class 466 have Alsthom 352 motors. The Class 365 have Alsthom 354 motors. This probably either means it has a longer core, bigger stator, or is simply just a newer version. I doubt it means that it has 2 extra pole pairs.

[@gapthemind--mindthegap8524]

@@ItsYa165 interesting. Im also aware the same motors can be used to do both higher and lower speeds. Meaning there possibly could have been usage of the met cam motors on the 365s with some sort of double reduction or 2/3 speed gearbox removing too much stress of higher speeds on the motor. This is hypothetical anyways.

[@ItsYa165]

@@gapthemind--mindthegap8524 none of that made any sense. There are no Metro-Cammell motors. Only Brush and Alsthom manufactured motors. The Class 465/2/9 uses the Alsthom 352 model. The Class 365 uses the Alsthom 354 model. The fact that they are different models means that they aren't interchangeable (because that would defy RAMS) and speed has nothing to do with anything as that's what a gearbox is for. Therefore, no, there would not be any swapping of motors between Class 465s and 365s because that would put the train at risk.

[@gapthemind--mindthegap8524]

@ItsYa165 im labelling the motors based on the trains. My bad. Also yes im reffering to a hypothetical scenario where the motor of a 465 metro cammel is geared up to be used for higher speed via the gearbox. Thats why i mentioned a 2 speed or 3 speed gear box, or reduction to aid the motor in performance if lets say they were used interchangeably. This is why i mentioned the gearbox being the factor making it possible in theory. Also im sure you could adapt the 465/9 ad 2 motors to work at 100mph with some mods+gearbox again this is all ideas. Not reality. Also what is RAMS

[@gapthemind--mindthegap8524]

Im sure also the 465 /1 and 0 was built by BREL and not metro cammel.

[@ItsYa165]

BREL and ABB built

[@Andrewjg_89]

Most train enthusiasts say that the Class 465 with the Brush traction motors are lot more efficient than the ones that have been upgraded with Hitachi traction motors.

[@gapthemind--mindthegap8524]

Its the same motor. Its just been modified and connected to a newer or modified IGBT. the old style inverter was apparently an issue for some reason. So they changed it or updated it.

[@Andrewjg_89]

⁠True

[@ItsYa165]

The BREL and ABB Class 465/0/1 have the Brush Traction motors. When Hitachi submitted the RAMS package for replacing the traction drive, it was based on the already fine three-phase Brush Traction motor. An ACIM or ASM itself cannot particularly have that much wrong with it. They tend to stay fairly innocent when it comes to reliability. The Metro-Cammell-built Class 465/2/9 and Class 466 have Alsthom 352 motors.