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Any circuit for driving a motor that's more complex than wiring it to a power source through a simple on/off switch. Examples include speed and torque control using H-bridges, brushless motor controllers, stepper controllers, VFDs. Constant speed examples include relay control, reversing, reduced-voltage starting, overload protection and other control requirements more complex than a simple 0n/off switch.

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Brushless DC motor controller / ESC output, DC or AC for EU Low Voltage Directive?

The EU "Low Voltage Directive" applies to goods with an input or output voltage of over 50 volt AC or 75V DC.^1 My question is: Would the output of an ESC be considered AC or DC in this context? Eg. w …
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