Although They Have The GTO-VVVF Controlled Traction Motors, Known For It's "Car Shift" Like Acceleration and Deceleration at Low Speeds. The IGBT For Instance Makes Rathet a "Whine" (Like in 2:26) Or a Hiss For Later IGBTs. The Best Example Are The Japanese EMUs Equipped with Hitachi, Mitsubishi, Toshiba Or Even Toyo Denki VVVF Motors.
@@FM60260 323s actually have IGBTs that are programmed to switch like this. These replaced the original GTOs (since replacements are hard to get hold of) but made it much easier and cheaper to get them certified (since they are putting out the same frequencies and interference as when they were originally tested and certified). The same has been done with other trains in other countries.
@@ChrisCooper312 Yes, it is pretty cool that Alstom set up the new IGBT equipment like they did. I don't know how much work it would take programming everything vs testing the motors on a default inverter setting. But I often wonder if someone at Alstom had a thing for the characteristics of the 323s and empathised for those that missed the old 465/0 after Hitachi repowered them, so decided to have them programmed rather than the motors recertified. I think it would also remove the need to have that weird artificial sound system on electric vehicles if the inverters were setup to have a lower switching frequency (and would also sound cooler when the lights turned green).
@@FM60260 it was nothing to do with keeping the sounds. That was just a result of the way they set up the new IGBTs. It's all about the electrical noise. The 323s were extensively tested back in the early 90s for the routes they operate to make sure that any electrical noise isn't a problem. By setting up the IGBTs to work exactly the same as the GTOs did, it means that testing is still valid.
Diego, você poderia explicar para leigos como funciona motores elétricos e pra que serve o inversor de frequências? Principalmente para enterdemos a diferença das trações GTO-VVVF e IGBT-VVVF
bom dia Diogo ! obrigado por compartilhar suas experiências , 2 perguntas : no seu outro vídeo ,1 ° pode ser usado com IGBT ? no meu vídeo , eu usei igbt, , parei os testes devido a falta de tempo, a etapa de DRIVE que eu desenvolvi pode usar IGBT ou qualquer transistor, mas esse seu é ótimo, o drive eu desejo desenvolver e vender no ML, , O japonês que aqui em baixo nas perguntas , ele perguntou se nesse vídeo aqui voce esta usando qual tipo de transistor na etapa de potência? eu penso que é um bloco , ok?
The IGBT (insulated-gate bipolar transistor), or GTO (gate turn-off thyristor), are just the names of the semiconductor technology used. Since IGBT is a much more modern transistor technology, it has a much higher switching frequency which gives it the ability to make a higher sound. But not every sound heard is to do with the semiconductor technology; most sounds relate to how the motor is pulsed, which is the VVVF (variable-voltage/variable-frequency) drive pulsing out an artificial AC wave from a DC supply (but if you have an AC supply it has to be converted to DC first). The sounds are not to do with gear changes, they are caused by a byproduct of how the software for the VVVF drive is programmed. The motor we use must be either an asynchronous or synchronous AC motor in a 3-phase configuration or a synchronous motor with permanent magnets. Since AC goes between positive and negative, we need 6 semiconductors, i.e. 3 for positive and 3 for negative. Depending on which type of semiconductor we are using, it may have a limit on how fast it can pulse at; this means upon reaching a certain speed we need to remove some pulses so that the semiconductors don't get overloaded. Since the pulse-width modulation is what causes the sound, every time pulses are removed causes the sound to go back down. This is for the pattern based method; there is also perfectionist method where semiconductors are pulsing at a set frequency that doesn't change as the voltage changes, changing how long they pulse between 0 and 100%; it's recommended upon reaching a certain speed to switch back to the pattern-based PWM method to obtain the precise pinpoints on where your VVVF drive pulses.
