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| Re: Wheel Axels (343876) | |||
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Re: Wheel Axels |
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Posted by nasadowsk on Mon Nov 27 00:06:09 2006, in response to Re: Wheel Axels, posted by 19characterusername on Sun Nov 26 23:36:01 2006. Some DMUs have mechanical transmissions, or hydromechanical types. You also sometimes hear a 'gear changing' noise on electrics, but that's just the VFD changing carrier frequencies as needed. Some types do, some don't, and it's not an IGBT vs GTO thing, since IGBT types do it too. More like what the engineers writting the software felt like :)I don't mind VFD carrier noise, but the constant shifting drives me nuts. I've yet to ride a PCCII, but they sound awfully like an ABB industrial inverter - just white noise. |
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