Скачать с ютуб Bombardier IGBT VVVF | Class 377/6 Traction Sound | PWM Inverter - Class 377 Inductor Recording в хорошем качестве

Bombardier IGBT VVVF | Class 377/6 Traction Sound | PWM Inverter - Class 377 Inductor Recording

Class 375/376/377/378/387 traction inverters - the Electrostar sound when running on 750VDC power mode... which is different to when running on the 25kVAC mode:    • Bombardier IGBT VVVF | Class 387/1 Tr...   All Electrostars use the Mitrac DR1000 TCMS which run the traction motors... it's all the same. Even the Movia 2009 Tube Stock uses the DR1000. A lot of people think that the Class 377/6, 377/7, and 377/8 sound different to the older trains because "they're new" or whatever. No, it's the voltage that determines the PWM option and it always has been. It's been the case for the Class 377/2 and the Class 377/5 on 25kVAC since forever. A higher voltage means more power, more flux, and more carrier voltage values to compare which gives merit to additional pulse modes which are chosen carefully by designers. With less voltage, those opportunities don't present themselves. On 25kVAC, the first sync mode is 15P... whereas on 750VDC, the first sync mode is 6P - nothing to do with the year of the train's manufacture... just science. I need to stomp this myth now before it gets out of hand. We can see: 1000Hz Async, 6P Sync, 5P Sync, 3P Sync, 1P Sync. 15P makes a cameo here on braking as the modulation index (the ratio of the carrier voltage to the phase voltage) calls the shots it seems. 00:00 Electromagnetic Recording 03:46 Natural Sound Recording 07:30 Natural Sound + Electromagetic Bombardier Transportation UK Ltd, the previous developer of the Electrostar platform, is now owned by Alstom Engineering and Services Ltd. Noise reduction post-processing: - 44100Hz sample of the ACU, HVAC, and Transformer - 48dB reduction - Triple sensitivity with no smoothing Equipment used: - 2x 1000mH telephone pickup coil - Tascam DR40X Class 375 Traction Motor Sound Class 376 Traction Motor Sound Class 377 Traction Motor Sound Class 378 Traction Motor Sound Class 387 Traction Motor Sound #induction #inductorwindingmachine #motor #vvvfサウンド #vvvfインバータ #vvvf #train