That's the special time wrap cycle were for a split second a wormhole opens up and one or two socks go missing.
My washing machine's motor controller does an interesting thing between 15kHz and 16kHz as it changes the spin speed. #UltrasoundInAirpic.twitter.com/kmlAcjPHA1
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I know, but a lot of people can't hear it and make devices that produce noise at those frequencies, sometimes at ear-damage levels. The hashtag is intended to cover near ultrasound too.
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Just the switching frequency? It will be louder when changing speeds due to higher torque.
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Look at those sidebands spreading out as the speed changes though. It's both amplitude *and* frequency modulated. I'm guessing an inverter with 3-phase AC output, internally switching at a fixed frequency and changing the AC output frequency.
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Please reverse engineer a bunch of washing machines, because honestly this is where we need to install our own software stacks. Mine has bugs and sucks feature wise. Mechanically it's fine.
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I know a lad that did this on his. Put an Arduino in it. It only has one mode, and you press water level down button to run the cycle. But it works
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Spectrogram encoded fireworks!
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Likely noise control. Get the power down via PWM at those rotation speeds that match the resonance frequency of the washing machine chassis.
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New twitter accound idea: EMI/EMC offenders. Name and shame any company finding unnecessary to respect EMI/EMC standards when designing their products.
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