Siemens Desiro City Class 700/707/717 features:
On 750VDC mode: 600Hz-700Hz PCFM, 1450Hz PCFM (~45km/h), 5P (~85km/h)
On 25kVAC mode: 675Hz SPWM, 675Hz-725Hz SPWM (~25km/h), 725Hz-1000Hz SPWM, 1000Hz SPWM (~45km/h), 5P (~85km/h)
5P half waves look like:
__|¯|_|¯¯|_|¯¯¯|_|¯¯|_|¯|__ 😸🧐💀
00:00:00 Electromagnetic
01:04:15 Natural Sound
02:08:31 Electromagnetic & Natural Sound
Noise reduction post-processing:
- 44100Hz sample of the ACU, HVAC, and Transformer
- 48dB reduction
- Triple sensitivity with no smoothing
- Manual frequency delete
- 8000Hz low-cut at 36dB
Equipment used:
- 2x 1000mH telephone pickup coil
- Sony ICD PX470
Class 350 Traction Motor Sound
Class 360 Traction Motor Sound
Class 380 Traction Motor Sound
Class 444 Traction Motor Sound
Class 450 Traction Motor Sound
Class 700 Traction Motor Sound
Class 717 Traction Motor Sound
#induction #inductorwindingmachine #motor #vvvfサウンド #vvvfインバータ #vvvf #train
