Once the fan spins, the inertia actually helps the motor and less energy will be needed. The electrical energy needed to make the fan turn is a given, at first, to start the fan up, a higher amount of energy is needed to compensate for the inertia. This is why most Electrical Appliances and motors are regulated using Voltage and the Amps are then drawn as needed to make up the Energy needed for whatever load said Appliance or Motor is under.

' On lightly loaded motors with easy-to-start loads, reducing the voltage will not have any appreciable effect, except that it might help reduce the light load losses and improve the efficiency under this condition.'Īlso, why did you think they use or should use Amps ? Using a higher voltage is more effecient and also easier to regulate than using Amps with a constant voltage.

To add to all of this that Article is talking about 230v Motors with Heavy Loads, which also requires more power to start, where a deviation in the Voltage being applied could cause more degridation of the motor if the load is hard to start, It even says right in the article

1Ax12V = 12watts of total power.Īs what your talking about the Electric motors, Pushing the limits of any motor will degrage is MTFB and the like, but Case fans for computers have different ratings that they are designed to operate in.Ī lot of fans can use anywhere from 5-12v and some can even use anywhere from 4.5-14v depending on the Motor used, so no it wont adversley effect the lifespan of the fans, which by the way usually have an MTFB of 50,000-100,000 Hours so any small degridation in the lifespan, say 1000 hours, represents a very small percentage of the lifetime of the motor. Well first off Overall Power, as in energy is regularly measure in Watts, not amps, and watts are calculated by multiplying amperage by voltage e.g.

3 pin fan controller