🌀 Motor Starting Methods

Motor parameters

FLA (running current) 50 A

Locked-rotor code (× FLA) 6.0×

Start ramp duration 4 s

Inrush current — first 6 seconds

DOL — full-voltage direct start Star-delta — 1/3 inrush in Y, then Δ Soft-start — voltage ramped up VFD — frequency ramped up, current stays near FLA

Comparison

⚡ Teaching visualization. Simplified inrush curves — real motor starting profiles depend on load type (fan, pump, conveyor), coupling inertia, and starter tuning. Always size overcurrent protection per CEC Section 28 / NEC 430, verify starter ratings against motor nameplate LRA, and consider utility inrush limits for large motors.