1 Answer. The casing is the flux return path for the magnets. If you replace it with plastic, the strength of the flux through the coils will be significantly reduced which will reduce the torque production efficiency of the motor.
What is the outer casing of a DC motor made of?
In DC motors the housing is usually made of solid steel with a cross-sectional area at least equal to the sum of the pole roots (or is it half the pole roots… can never remember that).
What is the outer casing of a DC motor called?
Whether permanent magnet or electromagnet, these generally form the outer casing of the motor and are termed the stator. For a d.c. motor with the field provided by a permanent magnet, the direction of rotation of the motor can be changed by reversing the current in the armature coil.
What are the parts of a DC motor?
These components are: a stator, a rotor, a yoke, poles, armature windings, field windings, commutator, and brushes.
What are motor casings made of?
The motor case generally consists of a steel or aluminum tube; it has a head-end dome that contains an igniter and an aft-end dome that houses or supports the nozzle.
What are the four main parts of a DC motor?
A brushed DC motor is made up of 4 basic components; the stator, the rotor ( or armature ), brushes, and commutator.
What are the applications of DC motor?
DC machines are also used in applications where high starting torque and accurate speed control over a wide range are important. Major applications for DC motors are: elevators, steel mills, rolling mills, locomotives, and excavators. Like other rotating machines, DC motors result from the interaction of two magnets.
Why DC current is not used in homes?
DC is mainly not applied for these purposes due to some reasons. For example, heat production due to more power loss compared to AC, more significant dangers of causing a fire, more costs, and problems from converting high voltage and low current to low voltage and high current with the help of transformers.
What are the 3 types of DC motors?
Main Types of DC Motors
- Permanent Magnet DC Motors. The permanent magnet motor uses a permanent magnet to create field flux. …
- Series DC Motors. In a series DC motor, the field is wound with a few turns of a large wire carrying the full armature current. …
- Shunt DC Motors. …
- Compound DC Motors.
What is the full form of dc motor?
A DC motor is defined as a class of electrical motors that convert direct current electrical energy into mechanical energy. From the above definition, we can conclude that any electric motor that is operated using direct current or DC is called a DC motor.
What is the principle of DC motor?
DC motors operate on Faraday’s principle of electromagnetism which states that a current-carrying conductor experiences a force when placed in a magnetic field.
What is the main function of DC motors?
A direct current (DC) motor is a type of electric machine that converts electrical energy into mechanical energy. DC motors take electrical power through direct current, and convert this energy into mechanical rotation.
Which is not part of a DC motor?
The correct answer to the question will be compass i.e compass is not a part of a DC motor. Various parts of a DC motor are coil of wire, armature, field magnets, brushes and commutator.
What materials are used in a motor?
Powder metal components for motors generally consist of iron, nickel, and cobalt.
- Iron is the cheapest of the three, so many designers turn there first.
- Cobalt is rarely used on its own, but is sometimes added to iron. …
- Nickel is expensive but valuable to motor applications.
What do you think is the role of electric motor in the materials appliances?
Answer: The role of electric motor is to converts electrical energy into mechanical energy, so that it can operate the appliances.
What do you think is the role of electric motor in the materials or appliances?
Electric motors impact almost every aspect of modern living. Refrigerators, vacuum cleaners, air conditioners, fans, computer hard drives, automatic car windows, and multitudes of other appliances and devices all use electric motors to convert electrical energy into useful mechanical energy.