[Inductor-Recorded Traction Motor Sound モハラジオ録音] MRTJ 1000 Series [Toyo Denki IGBT-VVVF]

[Inductor-Recorded Traction Motor Sound モハラジオ録音] MRTJ 1000 Series [Toyo Denki IGBT-VVVF] #モハラジオ #TractionMotorPWMSound #MRTJ 00:00 Title & Introduction 00:05 File#1: Station to Station - 1 01:48 File#2: Station to Station - 2 Car Type: MRT Jakarta (MRTJ) 1000 Series VVVF: Toyo Denki 2-Level IGBT-VVVF Sound Characteristics: Pattern: Asynchronous (800 Hz) → 9P → 1P *Asynchronous (2500 Hz → 1050 Hz) appears only immediately after startup This car is equipped with Toyo 2-level IGBT, but the carrier frequency of the asynchronous modulation is not the standard 1050 Hz, but 800 Hz, which is same as the JR East E129 series and Los Angeles Metro P3010. Sound source of LA Metro P3010：    • [Inductor-Recorded Traction Motor Sound モハ...   The length of the asynchronous modulation is a combination of long during acceleration and short during deceleration (classified as “Y2I-1D” in my website: https://vvvfdb.stars.ne.jp/analysis/t..., and this type was adopted before any other car models in Japan. The way to stop powering/braking seems to change depending on the driving operation, and in the second file, there were cases where the 1-pulse mode was maintained until just before. The AC traction PWM sound shown in this video is recorded by a sensor. This sensor is made by myself just using a 100 mH inductor. 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 January 2023. 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 Please click here to subscribe:    / @ebaraexpress7260