Copyright Goodheart-Willcox Co., Inc. 256 Essential Electrical Skills for HVACR: Theory and Labs 1 1 S N + – L1 S N L2 Centrifugal switch Run winding (red lines) reaches peak current and maximum magnetic field strength Start winding (blue lines) at zero current and no magnetic field First Half Cycle of Sine Wave Goodheart-Willcox Publisher Figure 13-7. The run winding current peaks as the start winding current decreases. The rotor moves clockwise. 1 1 S N + – L1 S N L2 Centrifugal switch Run winding (red lines) reaches peak current and maximum magnetic field strength Start winding (blue lines) at zero current and no magnetic field Inertia causes continued rotation to complete 180° in a half cycle First Half Cycle of Sine Wave Goodheart-Willcox Publisher Figure 13-8. Inertia causes the rotor to complete half a rotation, 180°.