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Please enjoy the sound of the Toshiba IGBT-VVVF inverter on Tobu Railway's paid express 500 series "Liberty"! Like Seibu's 40000 series, the Liberty has a quiet PMSM sound, and the same sound can be heard on Hankyu and Keio trains. PMSM is suitable for lines with repeated acceleration and deceleration, so I wondered why Tobu chose the expensive PMSM for its express trains. In mountainous areas with many slopes, the anti-skid and adhesion coefficients are increased, and the characteristics of the PMSM motor are demonstrated. Filming locations: Tobu World Square Station, Tochigi Station, Kita-Senju Station, inside Tobu World Square, along the line (Tobu Zoo to Sugito Takanodai) Good sound level: ★★☆☆☆ 2 Exterior: ★★★★★ 5 *This is the poster's personal rating [Good Sound♪Sound Train Video Series No. 266] *The title "PMSM drive" is an abbreviated expression for the PMSM motor and parallel cardan drive, and does not refer to the drive device. Also, despite the misconception that many people have, "PMSM" refers to the "permanent magnet synchronous motor" that moves the train car attached to the bogie, and is different from the VVVF inverter device.