[Vermont Lt]

So you are telling me there would no RFI from an electric motor that would interfere with an AM radio?

That’s interesting.

[Elsie]

No, I'm not. But brushless motors use electronics to detect when to apply power (at voltage zero crossing) to windings and brush style motors use mechanics to do so (the commutator/brush may not be aligned at zero crossing of the voltage, cause a surge or spark - which is the source of the RFI).

https://en.wikipedia.org/wiki/Zero-crossing_control