[Inductor-Recorded Traction Motor Sound モハラジオ録音] E2-1000 Series Shinkansen

Описание: #モハラジオ #TractionMotorPWMSound #E2Series

00:00 Title & Introduction
00:05 File 1-1: Type 1 Acceleration
03:18 File 1-2: Type 1 Braking
07:04 File 2-1: Type 2 Acceleration
10:13 File 2-2: Type 2 Braking
13:48 File 3-1: Type 3 Acceleration
16:59 File 3-2: Type 3 Braking
21:23 Manufacturer Presumption

Car Type:
JR East E2-1000 Series Shinkansen

VVVF:
Hitachi/Mitsubishi/Toshiba 3-level IGBT-VVVF

Sound Characteristics:
[Type 1]
Pattern:
Asynchronous (Dipolar Modulation → (Continuous Transition) → Unipolar Modulation) → Multi-Pulse Mode (3-Pulse Mode) → 1P
Asynchronous Mode Carrier Frequency:
500 Hz (Dipolar Modulation) → (Continuous Transition) → 1000 Hz (Unipolar Modulation)
For the dipolar modulation, the most emphasized component is around four times the carrier frequency.

[Type 2]
Pattern:
Asynchronous (Dipolar Modulation → Unipolar Modulation) → Multi-Pulse Modes (9P → 3P) → 1P
Asynchronous Mode Carrier Frequency:
500 Hz (Dipolar Modulation) → 1000 Hz (Unipolar Modulation)
For the dipolar modulation, the most emphasized component is around twice the carrier frequency.

[Type 3]
Pattern:
Asynchronous (Dipolar Modulation → Unipolar Modulation) → Multi-Pulse Mode → 1P
Asynchronous Mode Carrier Frequency:
①Set a random modulation spread spectrum between upper limit 1000 Hz and lower limit 750 Hz → 1000 Hz.
②Only for the dipolar modulation part, set the carrier frequency to 1/2 compared to the setting of ①.
③For the dipolar modulation, the most emphasized component is around four times the carrier frequency.
　On the other hand, for the unipolar modulation, the most emphasized component is around twice the carrier frequency.
　This factor and the factor ② make the most emphasized components sound connected.

Others:
In addition to the 3 types shown in this video, the E2-1000 Series was also equipped with Fuji Electric's CI only for the J51 formation. (See P.48 below)
https://cf-store.widencdn.net/fujiele...
Unfortunately, it was not applied for the mass-produced cars, and since the J51 formation has already been scrapped, we cannot confirm the PWM at present.
The sound sources for the other cars in this video can be found below.
JR West 223-2000 Series (Hitachi Traction):
https://vvvfdb.stars.ne.jp/vvvf_data/...
Meitetsu 3100 Series (Toshiba Traction):
https://vvvfdb.stars.ne.jp/vvvf_data/...
Tokyo Metro 7000 Series ･ 6000 Series (6301, 6418) (Mitsubishi 3 Level IGBT-VVVF Traction):
https://vvvfdb.stars.ne.jp/vvvf_data/...
JR Kyushu 800 Series Shinkansen:
   • [Inductor-Recorded Traction Motor Sound モハ...  

The AC traction PWM sound shown in this video is recorded by a sensor. This sensor is made by myself just using a 100mH inductor.
Regarding the files used, the extra noise components has been reduced from the ones saved immediately after recording. In addition, the WaveTone screen of the E2-1000 in the movie shows a 400 Hz high-pass filtered version of this sound source in order to make the spectrum near the carrier frequency easier to see.
Due to the resolution of the spectrogram software, the frequency displayed in this video may include some error. Thank you for your understanding.
This sound is recorded in December 2022.
Sorry, I am NOT taking requests for recordings.

Posted by Ebara Express
X (Available in Japanese; translate please!):
https://x.com/VVVF_tokyu2000
Website "VVVF Database" (Available in Japanese; translate please!):
https://vvvfdb.stars.ne.jp
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