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  • Users: onatirec
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  1. onatirec

    Flexplate design: misalignment and fatigue

    Hello, I'm going through an analysis for a flexplate connecting a diesel engine to single bearing generator. We are currently using a HSLA 50 Class 1 steel and haven't had any failures to date. We do however have some concerns about fatigue from bending due to angular misalignment (at the far...
  2. onatirec

    PWM Subharmonics?

    I've been looking at noise and vibrations from a small-medium, 3-phase AC motor and have found peaks at multiples of 4kHz (8k, 12k, 16k)… They show up in a spectrogram just as I would expect PWM signals and their corresponding harmonics to appear. The PWM is set at 16kHz, and these peaks show...
  3. onatirec

    Electric motor NVH

    In gathering data to characterize noise and vibration in electric motors, I'm having trouble understanding some spectrogram features. The sharp vertical lines seem to behave very similar to pwm harmonics (see pic). They are flanked by sloped lines at multiples of twice the fundamental mechanical...

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