Compare single-phase and three-phase induction motors.
Q.1 (d) Compare single-phase and three-phase induction motors.
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| Point | Single-phase induction motor | Three-phase induction motor |
|---|---|---|
| Supply | 1-phase AC | 3-phase AC |
| Field produced | Pulsating field (two counter-rotating fields) | Rotating magnetic field of constant magnitude |
| Starting | Not self-starting; needs auxiliary winding/capacitor or shading coil | Self-starting |
| Efficiency and pf | Lower | Higher |
| Power rating | Fractional kW (small) | Up to hundreds of kW / MW |
| Torque | Pulsating, lower starting torque | Uniform, higher starting torque |
| Size/cost per kW | Larger, costlier per kW | Smaller, cheaper per kW |
| Applications | Fans, mixers, washing machines, pumps, refrigerators (domestic) | Industrial drives: lathes, compressors, cranes, pumps, conveyors |
Doubtly AI
· 25 Oct 2026
AI-verified · Oct 2026
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