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document updated a month ago, on Dec 22, 2022

product-search for a fan speed controller (or speed controllers for other AC motors)

My goal is to make my desk fans slow down, even below their lowest setting, for use during winter.

modifying electronic components

If you're willing to tinker with the innards of a fan, most commercial off-the-shelf (COTS) fans use a speed controller that's either capacitor-based or triac-based. (TODO — is this actually right? I need to find more sources to confirm this)

For capacitor-based speed controllers [2], you could adjust the capicatance values for the high/med/low settings, or install a variable capacitor to achieve "stepless" speed control.

For triac-based speed controllers [2] [3], (TODO)

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