How Dc Motor Works Pdf

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How DC motor works explain?

DC motors take electrical power through direct current, and convert this energy into mechanical rotation. DC motors use magnetic fields that occur from the electrical currents generated, which powers the movement of a rotor fixed within the output shaft.

What is DC motor in PDF?

An electrical motor is a machine that mainly converts electrical energy into mechanical energy. A DC motor is an electrical machine that converts mechanical energy into direct current and vice-versa.

What is the application 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.

What is main part of DC motor?

DC motors include two key components: a stator and an armature. The stator is the stationary part of a motor, while the armature rotates. In a DC motor, the stator provides a rotating magnetic field that drives the armature to rotate.

What are the characteristics of DC motor?

The performance of a DC motor is given by the relation among the armature current, torque and speed. These relations are given graphically in the form of curves, which are called as characteristics of DC motors.

What is the efficiency of DC motor?

Most electric motors are designed to run at 50% to 100% of rated load. Maximum efficiency is usually near 75% of rated load. Thus, a 10-horsepower (hp) motor has an acceptable load range of 5 to 10 hp; peak efficiency is at 7.5 hp.

What is the importance of DC motor?

The primary advantage of the DC motor is that it can develop constant torque over a wide speed application. Power supply is an important consideration in the application of DC motors. The most common way to provide DC voltage to a motor from an AC line is through the use of an electronic drive.

Where are DC motors generally used?

Small DC motors are used in tools, toys, and appliances. The universal motor can operate on direct current but is a lightweight brushed motor used for portable power tools and appliances. Larger DC motors are currently used in propulsion of electric vehicles, elevator and hoists, and in drives for steel rolling mills.

What is armature in DC motor?

The armature of an electric machine is the name historically given to the winding where a voltage is induced and power transfer between electrical and mechanical systems occurs. It is a term used in dc machines and ac synchronous machines. In a dc machine, the armature is the rotating circuit.

What is pole in DC motor?

The stator of the DC motor has poles, which are excited by DCs to produce magnetic fields. In the neutral zone, in the middle between the poles, commutating poles (supplied by a DC) are placed to reduce sparking of the commutator. Compensating windings are mounted on the main poles.

What is rotor in DC motor?

The rotor is a moving component of an electromagnetic system in the electric motor, electric generator, or alternator. Its rotation is due to the interaction between the windings and magnetic fields which produces a torque around the rotor’s axis.

What is the frequency of DC?

The frequency of direct current (DC) is 0 Hz, as the current only flows in one direction.

How does a motor produce electricity?

The transfer of energy begins with the mechanical rotation of the shaft and rotor. As the rotor spins inside of the stator, it generates a current. The current can then be harnessed and used to supply electricity to an external circuit.

Can a DC motor charge a battery?

For the electric motor to provide DC energy, its output has to pass through an electronic circuit called a rectifier. An electric motor can be used in conjunction with a source of mechanical energy and a rectifier to recharge a 12V battery.

Does a DC motor produce AC current?

If you put any kind of load on it, the voltage will drop drastically. Small DC motors don’t really generate a lot of power when you spin them. An LED will operate on AC. An LED is after all a diode (Light Emitting Diode) and so will rectify as needed.

What are the two main parts of a DC motor?

DC motors include two key components: a stator and an armature. The stator is the stationary part of a motor, while the armature rotates. In a DC motor, the stator provides a rotating magnetic field that drives the armature to rotate.

What is armature voltage?

Armature voltage is the voltage developed at the terminals of the armature winding of an AC or a DC machine during generation of power.

What is the function of commutator?

On DC and most AC motors the purpose of the commutator is to insure that the current flowing through the rotor windings is always in the same direction, and the proper coil on the rotor is energized in respect to the field coils.

What is the function of a stator?

In an electric motor, the stator provides a magnetic field that drives the rotating armature; in a generator, the stator converts the rotating magnetic field to electric current. In fluid powered devices, the stator guides the flow of fluid to or from the rotating part of the system.

What is the torque of DC motor?

The sum of the torques due to all the armature conductors is known as armature torque (τa). The expression in the equation (2) is known as the armature torque of DC motor. Therefore, the armature torque developed in a DC motor is directly proportional to the flux per pole and the armature current.

What is DC starter?

Starters are used to protect DC motors from damage that can be caused by very high current and torque during startup. They do this by providing external resistance to the motor, which is connected in series to the motor’s armature winding and restricts the current to an acceptable level.

Why do we use 2 point starter in DC motor?

In case of series motors, field and armature are inserted and hence starting resistance is inserted in series with the field and armature. Such a starter used to limit the star4ting current in case of dc series motor is called two point starters.

What is motor used for?

An electric motor is a device used to convert electrical energy into mechanical energy. Scientifically speaking, the electric motor is a unit used to convert electric power into motive energy or electrical energy into mechanical energy.

What are the losses in DC motor?

Copper losses. Eddy-current losses. Hysteresis losses. Mechanical losses.

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