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Questions and Answers
What is the primary function of a DC motor?
Which principle explains the operation of a DC motor?
Which type of winding in a DC motor is stationary?
What is a characteristic feature of a DC shunt motor?
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In a DC series motor, how is the field winding connected?
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Which type of DC motor has a combined field winding configuration?
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What causes the rotor of a DC motor to rotate?
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Why does a DC series motor utilize fewer turns of wire in the field winding compared to the armature winding?
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Study Notes
Introduction to DC Motors
- A Direct Current (DC) motor transforms electrical energy into mechanical energy.
- Operates using electricity and a magnetic field to generate torque, which turns the rotor.
Principle of DC Motors
- Based on electromagnetism principles.
- Current-carrying conductors in a magnetic field experience the Lorentz force.
- This force generates torque, causing the motor's rotor to rotate and deliver mechanical work.
Construction
- Comprises two main components: Field winding and Armature winding.
- Field winding remains stationary while armature winding rotates.
- DC supply to the field winding produces a magnetic field.
- The rotating armature winding, powered by a DC source, causes the shaft to turn due to the Lorentz force.
Working of DC Motors
- Types of DC motors include:
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DC Shunt Motor
- Parallel arrangement of two windings connected to a common DC supply.
- Shunt field winding has higher resistance than armature winding.
- Shunt winding consists of more turns with thinner wire than the armature winding.
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DC Series Motor
- Field winding is connected in series with the armature.
- Armature current is identical to the current in the series winding.
- The series winding has fewer turns of thicker wire, resulting in lower resistance than the shunt winding.
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DC Compound Motor
- Combines features of both shunt and series motors for varied applications (not detailed in text).
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Applications
- Widely used in various industries due to their simplicity and effectiveness in converting electrical energy to mechanical work.
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Description
This quiz covers the fundamentals of DC motors, including their principle of operation, construction, working mechanism, types, and applications. Understanding these concepts is essential for grasping how these motors convert electrical energy into mechanical energy.
