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Questions and Answers
What is the primary function of the commutator in a DC motor?
What is the primary function of the commutator in a DC motor?
- To reverse the direction of current flow (correct)
- To maintain electrical contact between parts
- To convert mechanical energy to electrical energy
- To generate a magnetic field
Which component of a DC motor is responsible for creating a stationary magnetic field?
Which component of a DC motor is responsible for creating a stationary magnetic field?
- Stator (correct)
- Brushes
- Commutator
- Rotor
How do DC motors achieve variable speed and torque?
How do DC motors achieve variable speed and torque?
- By varying the voltage supplied to the motor (correct)
- By changing the frequency of the current
- By adjusting the load on the rotor
- By altering the size of the rotor
What role do brushes play in a DC motor?
What role do brushes play in a DC motor?
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What property of DC motors makes them suitable for applications in robotics and electric vehicles?
What property of DC motors makes them suitable for applications in robotics and electric vehicles?
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Which of the following components is a moving part in a DC motor?
Which of the following components is a moving part in a DC motor?
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Study Notes
DC Motor Overview
- Converts electrical energy into mechanical energy through magnetic field interaction.
- Operates on electromagnetism principles; current in a coil generates a magnetic field, producing rotational motion.
Key Components
- Stator: Stationary part containing permanent magnets or windings, creating a magnetic field.
- Rotor (Armature): Rotating part with a coil or winding that carries current, interacting with the stator's magnetic field.
- Commutator: Rotating switch that reverses current direction in the rotor, ensuring continuous rotation.
- Brushes: Conductive materials that maintain electrical contact between stationary and rotating components.
Characteristics and Applications
- Valued for simplicity, ease of control, and variable speed and torque capabilities.
- Commonly used in electric vehicles, robotics, and household appliances.
- Speed and torque control achieved by adjusting the voltage supplied to the motor, enhancing versatility in various applications.
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