Two-Phase Servomotors Quiz

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Questions and Answers

What is the primary feature of two-phase servomotors that distinguishes their construction?

They are characterized by high inertia and low-resistance rotor.
They have a single winding that controls speed.
They include two primary windings displaced by 90° electrical degrees. (correct)
They operate using a three-phase power supply.

What type of rotor is typically used to achieve low inertia in two-phase servomotors?

Drum rotor
Squirrel cage rotor
Drag cup rotor (correct)
Solid rotor

What kind of supply is applied to achieve balanced operation in two-phase servomotors?

Unbalanced three-phase supply
Variable frequency supply
Asymmetrical single-phase supply
Two-phase balanced supply (correct)

Which component of a two-phase servomotor is analogous to that of a split-phase induction motor?

Stator windings (B) Signup and view all the answers

What is the purpose of the high resistance in the rotor of a two-phase servomotor?

To achieve linear speed-torque characteristics (C) Signup and view all the answers

What is essential for a 2-phase servomotor to operate in a balanced manner?

The two windings must be displaced by 90° electrical angle and have the same number of turns. (A) Signup and view all the answers

In unbalanced operation of a 2-phase servomotor, how can the unbalanced supply be analyzed?

By decomposing it into positive and negative balanced voltages. (A) Signup and view all the answers

Which of the following represents the positive sequence component in the context of machine performance?

The component that causes a clockwise rotation. (B) Signup and view all the answers

What equation is associated with the aspects of 2-phase servomotors discussed?

$ α = -j$ (D) Signup and view all the answers

What is necessary for accurately determining machine performance using sequence components of voltages?

The development of an equivalent circuit that incorporates positive and negative sequence components. (A) Signup and view all the answers

Flashcards

Two-Phase Servomotor

An AC servomotor with two windings displaced by 90 electrical degrees, having low inertia and high resistance rotor for linear speed-torque characteristics.

Stator (Two-Phase Motor)

The stationary part of the motor with two windings (control & reference) displaced by 90 electrical degrees; similar to a split-phase induction motor.

Rotor Types (Two-Phase Motor)

Two types: squirrel-cage and drag-cup. Squirrel-cage rotors are common, small diameter, high resistance for linear speed-torque. Drag-cup rotors are for low-output motors.

Balanced Two-Phase Operation

Two windings with equal turns and cross-sections, symmetrical, fed by balanced two-phase supply—important for optimal motor performance.