When stator and rotor windings of a 2-pole rotating electrical machine are excited, each would produce...

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When stator and rotor windings of a 2-pole rotating electrical machine are excited, each would produce a sinusoidal mmf distribution in the airgap with peal values F and F. respectively. The rotor mmf lags stator mmf by a space angle 8 at any instant as shown in figure. Thus, half of stator and rotor surfaces will form one pole with the other half forming the second pole. Further, the direction of torque acting on the rotor can be clockwise or counter-clockwise. Stator Surface ABC forms -Stator (A) North Pole (B) South Pole (C) North Pole (D) South Pole Airgap D -Rotor Fs FR Stator mmf axis The following table gives four set of statement as regards poles and torque. Select the correct set corresponding to the mmf axes as shown in figure. Rotor mmf axis Stator Surface CDA forms South Pole North Pole South Pole North Pole Rotor Surface abc forms North Pole North Pole South Pole South Pole Rotor surface cda forms South Pole South Pole North Pole North Pole Torque is Clockwise Counter Clockwise Counter Clockwise Clockwise When stator and rotor windings of a 2-pole rotating electrical machine are excited, each would produce a sinusoidal mmf distribution in the airgap with peal values F and F. respectively. The rotor mmf lags stator mmf by a space angle 8 at any instant as shown in figure. Thus, half of stator and rotor surfaces will form one pole with the other half forming the second pole. Further, the direction of torque acting on the rotor can be clockwise or counter-clockwise. Stator Surface ABC forms -Stator (A) North Pole (B) South Pole (C) North Pole (D) South Pole Airgap D -Rotor Fs FR Stator mmf axis The following table gives four set of statement as regards poles and torque. Select the correct set corresponding to the mmf axes as shown in figure. Rotor mmf axis Stator Surface CDA forms South Pole North Pole South Pole North Pole Rotor Surface abc forms North Pole North Pole South Pole South Pole Rotor surface cda forms South Pole South Pole North Pole North Pole Torque is Clockwise Counter Clockwise Counter Clockwise Clockwise

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