🔍 Key Concepts

• Figure B shows an auxiliary (start) winding in series with a start capacitor and a centrifugal switch – this is the classic capacitor-start split-phase motor configuration. • Compare the typical starting torque and running efficiency of these types in the split‑phase family: resistance‑start (no capacitor), capacitor‑start (start capacitor only), permanent‑split capacitor (run capacitor only), and capacitor‑start/capacitor‑run (both). • Think about what a start capacitor is optimized for (starting performance) versus what a run capacitor is optimized for (running performance/efficiency).

💭 Think About

• How does adding a start capacitor in series with the auxiliary winding affect the phase angle between currents in the main and auxiliary windings, and what does that do to starting torque? • Once the motor is up to speed and the centrifugal switch opens, is any capacitor left in the circuit to improve running power factor and efficiency? • Which option best matches a motor that is designed mainly to improve starting performance but reverts to a standard induction‑run condition after startup?

✅ Before You Answer

• Confirm in the diagram that the capacitor in figure B is labeled Start Capacitor and is removed from the circuit by the centrifugal switch during normal running. • Verify whether there is any run capacitor left in the circuit in figure B once the motor reaches speed – this directly affects running efficiency. • Match that configuration to the known characteristics of a capacitor‑start, induction‑run split-phase motor: focus separately on starting torque and running efficiency.