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Working Principle of DC Motor Video Lecture - Class 11

FAQs on Working Principle of DC Motor Video Lecture - Class 11

1. What is the working principle of a DC motor?
Ans. The working principle of a DC motor is based on the interaction between the magnetic field produced by the stator (stationary part) and the magnetic field produced by the rotor (rotating part). When an electric current is passed through the armature (rotor), it experiences a force due to the interaction of these magnetic fields, causing it to rotate.
2. How does a DC motor convert electrical energy into mechanical energy?
Ans. A DC motor converts electrical energy into mechanical energy through the process of electromagnetic induction. When an electric current is supplied to the armature of the motor, it creates a magnetic field. This magnetic field interacts with the magnetic field of the stator, causing a force to be exerted on the armature, resulting in rotational motion.
3. What are the main components of a DC motor?
Ans. The main components of a DC motor include the stator, rotor, commutator, brushes, and armature. The stator is the stationary part of the motor that houses the field windings. The rotor is the rotating part that contains the armature windings. The commutator is a rotary electrical switch that allows the current to flow in the armature windings. The brushes are conductive connections that supply current to the commutator, and the armature is the part that rotates and interacts with the magnetic field to generate motion.
4. How does the commutator function in a DC motor?
Ans. The commutator in a DC motor serves as a rotary electrical switch. It consists of segments that are connected to the armature windings. As the armature rotates, the commutator changes the direction of the current in the armature windings at the appropriate time, ensuring that the torque produced is always in the same direction. This allows the motor to continue rotating in a single direction.
5. What are the advantages of a DC motor?
Ans. DC motors have several advantages, including high starting torque, precise speed control, and a wide range of speed control. They are also relatively simple in construction, making them cost-effective. Additionally, DC motors can operate at high speeds and are able to provide constant torque over a wide range of speeds. These advantages make DC motors suitable for various applications, such as in electric vehicles, robotics, and industrial machinery.
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