He ended up exploring hard drive motors as encoders ... A little oscilloscope work showed the expected three-phase output when the motor hub was turned, with the leading and lagging phases ...

Variable frequency drives (VFDs) are used in many industrial applications to improve energy efficiency and provide precise control over electric motors. By adjusting the frequency, voltage and current ...

Industry generally runs on three-phase AC systems, mainly because three-phase electric motors are so much more efficient and compact than the equivalent single-phase motor. But residential ...