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Single-Phase Induction Motors

Part 6

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Instantaneous direction of current in

rotor bars:

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The direct axis flux and the quadrature-axis

flux:

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The resultant flux:

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Starting Method

• Phase splitting

 – Resistance start

 – Capacitor start

 – Two-value capacitor

 – Permanent-split capacitor

• Pole shading

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Phase Splitting:

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Pole Shading:

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Locked-Rotor Torque:

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Example 1. Resistance start

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Capacitor start

Permanent-split capacitor motor:

Two-value capacitor start:

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Example 2. Capacitor start 

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NEMA Standard Rating for Single-Phase

Induction Motors:

NEMA –  National Electrical Manufacturers Association

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  End of Part 6