Dashboard NCEES PE Power — Oct 2025 Blueprint 6. Rotating Machines B. Motor starting

B. Motor starting

DC motor starters, induction motor starting methods (DOL, star-delta, autotransformer, soft-start, VFD).

Lessons

Lesson 1

DC motor starter design

Stepped armature resistance, 3-point and 4-point starters, NVR + OLR coils, and the modern current-limited converter.

Freshman ~8 min
Lesson 2

Starting methods compared

DOL, star-delta, autotransformer, rotor resistance, soft starter, VFD — six ways to tame the inrush.

Freshman ~9 min