Whining sound? Motors, esc, mfu, board?

[MrChef]

So electronics wizards this really isn't bothering me but it's something I notice and am curious about. It's definitely noticeable on some tanks more than others and interestingly enough almost non existent on my last FrankenTiger build.

So 3 Taigen/Torro tanks all same motors/gears. First 2 V3 boards. Sorry about anty background fan noise it's bloody hot and humid here. Got the AC cranking.

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The oldest one is the loudest circa 2018.

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Newer one whines the same.

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Is it strange that the FrankenTiger is almost silent? TK7.0 mated to the same Taigen motors and gearbox. It does make a slight whine but so much less and a higher pitch.

Learn me some electronic black magic knowledge Ye olde Wizards.

[ColemanCollector]

When I asked about the whining noise in the Coolbank Stuart, consensus was the esc/mosfets were the culprit. The older HLs I have with the RX18 mfu's are especially bad. Sounds like the newer components in the TK7.0 are doing a good job of noise reduction compared to the V3's.
viewtopic.php?p=367978#p367978

On the motor front, you can try adding capacitors from the terminals to the motor can, and apparently twisting the power leads around each other can help(?)

Mike.

[MrChef]

When I asked about the whining noise in the Coolbank Stuart, consensus was the esc/mosfets were the culprit. The older HLs I have with the RX18 mfu's are especially bad. Sounds like the newer components in the TK7.0 are doing a good job of noise reduction compared to the V3's.
viewtopic.php?p=367978#p367978

On the motor front, you can try adding capacitors from the terminals to the motor can, and apparently twisting the power leads around each other can help(?)

Mike.

Thanks for sharing that Mike. I wasn't sure where to post the query-

Makes more sense.

Like my videos show the V3 groaning along. I guess it's just the TK7.0 is newer. It barely whines like the Taigen boards. BUT I also just thought that the TK7.0 is more progressive/sensitive control combined with a different frequency that it's just much less noticeable.

[Pavel]

The sound itself is produced by the motor winding...
But the reason is precisely in the motor regulator.
This device has a low-quality protection circuit against reverse current induction...
If we exaggerate and compare it with water pipes, then there is no check valve.
This can be fixed by buying a higher-quality motor regulator....
Installing additional capacitors or larger capacity may help, but this is not a fact...
First try a less expensive option with capacitors..

[MrChef]

The sound itself is produced by the motor winding...
But the reason is precisely in the motor regulator.
This device has a low-quality protection circuit against reverse current induction...
If we exaggerate and compare it with water pipes, then there is no check valve.
This can be fixed by buying a higher-quality motor regulator....
Installing additional capacitors or larger capacity may help, but this is not a fact...
First try a less expensive option with capacitors..

I was more curious why it makes the sound more than remedying it. The new one will be a TK7.1 that I have waiting. So since the other TK7.0 doesn't seem to be nearly as bad I'd guess it won't be an issue. Thank you very much

[Pavel]

In principle, the capacitors that are installed on the motor brushes remove high-frequency interference from sparks, they interfere with the control of equipment with a frequency of 27 MHz.... For 2.4 . this is not critical, but for a number of reasons, manufacturers install them (since the production of models with 27 MHz still exists...)