bldc motor speed calculation measure the time between two transitions: ttr it's the time it takes to go 60 electrical degrees (or 1/6 electrical period) electrical frequency = (1/6) / ttr multiply by 2xpi to get rd/s multiply by number of pole pairs (P) to get mechanical speed multiply electrical frequency by 60xP to get RPM 1. / One Formula: David Vizard's Rule for IM Runner Length The general rule is that you should begin with a runner length of 17.8 cm for a 10,000 rpm peak torque location, from the intake opening to the plenum chamber. You add 4.3 cm to the runner length for every 1000 rpm that you want the peak torque to occur before the 10,000 rpm.

The concept of motor starting time "ta" can be associated to this concept of properly calibrated starting and can be evaluated making reference to concepts linked to the motion dynamics, but also by introducing simplifying hypotheses which allows, however, an evaluation with a good approximation.

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