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Rotor Winding and Control Systems

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Questions and Answers

What is the primary purpose of the rheostat connected to the rotor in this motor design?

To maintain consistent speed under varying loads

To connect the rotor to a three-phase supply directly

To increase the starting torque during the starting period (correct)

To provide insulation for the rotor windings

How are the slip-rings modified during the motor's normal running conditions?

They are disconnected to prevent electrical faults

They are short-circuited by a metal collar (correct)

They are connected to a variable resistor

They are replaced with solid conductors

What characteristic of the rotor winding is noted in this design, even when the stator is two-phase?

It utilizes a single-layer configuration

It is wound for fewer poles than the stator

It has no external connections

It is always wound 3-phase (correct)

What effect does lifting the brushes from the slip-rings have on the motor's operation?

<p>Reduces frictional losses and wear and tear</p> Signup and view all the answers

What happens to the rotor's winding terminals when the motor is started?

<p>They are connected to three insulated slip-rings</p> Signup and view all the answers

Study Notes

Rotor Winding Details

Rotor uses 3-phase, double-layer, distributed winding.
Rotor winding poles match stator poles.
Rotor winding is 3-phase, even if stator is 2-phase.
Internal rotor phases are connected in a star configuration.
External terminals of the three phases are connected to slip rings.
Slip rings are mounted on the shaft, with brushes contacting them.
Brushes are connected to an external 3-phase star-connected rheostat.

Starting Control

Rheostat allows variable resistance in rotor circuit during startup.
Increased resistance enhances starting torque.
This adjusts the speed-torque/current characteristics.

Running Conditions

Metal collar short-circuits slip rings during normal operation.
Brushes are lifted from slip rings to reduce friction and wear.
Under normal operation, the wound rotor is short-circuited like a squirrel-cage rotor.

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Description

This quiz covers the essential details of rotor winding in electrical machines, including starting control mechanisms and operational conditions. Learn about the phase configurations, rheostat functions, and how the rotor's design contributes to performance. Test your understanding of these key concepts in electromechanical systems!