How does strong dc work

A Direct Current DC motor is a motor that turns energy from a direct current and turns this into mechanical energy. They were commercially unsuccessful, because these motors were battry powered and batteries were still very expensive and the quality was low. When the electrical grid was created and the rechargeable batteries were invented in the late s this all changed. The first commercially viable DC motors entered the market. DC motors have been improved continiously, but other types of motors, like the BLDC motor , have been developed in the mean time too.

As a result, the use of brushed Direct Current motors in several applications is limeted today. The rotor is normally located on the inside of the motor, while the stator is located on the outside.

The rotor contains coil windings that are powered by the DC current and the stator contains either permanent magnets or electromagnetic windings. When the motor is powered by DC current, a magnetic field is created within the stator, attracting and repelling the magnets on the rotor. This causes the rotor to start rotating.

To keep the rotor rotating, the motor has a commutator. When the rotor aligns with the magnetic field, it would stop spinning, but in this case the commutator would reverse the current through the stator and this way reverse the magnetic field. This way the rotor can keep spinning. Each coil is o from the previous coil. The brushes of a DC motor provide the coils with power and are metal pieces that act like springs. On one side, they have a conductive material made of carbon. On the other side, they have a pin where the power supply is applied to the motor.

The brushes are pushed by their spring action against the commutator, are held in place by the brush arms, and are directly connected to the terminals or electrical supply. The commutator is made of small copper plates that are mounted on the shaft and rotate as the shaft rotates.

The rotation of the rotor causes the poles of the power supply to the coils to change. Each coil is connected to two commutator plates, which are electrically isolated from each other but connected by the coils.

With positive and negative terminals connected to two commutator plates, current easily flows and an electromagnetic field is generated. DC motors are used in any number of applications since they have a high starting torque compared to induction motors. Brushed DC motors are easy to miniaturize, and they provide good rotational control as well as high efficiency. Brushless DC motors have a long life due to their lack of wear from brushes, are easy to maintain, and are noiseless.

It is easy to find DC motors since they are all around us in multiple applications and processes. DC motors have been used as a mechanical power source for over years. The variations in their use run from providing power to a ceiling fan in a bedroom to supplying mechanical energy to a large printing press.

In a diesel electric locomotive, combustion from the diesel engine is converted into rotational energy by the diesel engine, which is coupled with a generator that converts it to electrical energy.

The converted electrical energy is fed to DC motors that are coupled with the wheels on the engine. Brushed DC motors are used in electric vehicles for retracting and positioning electrically powered windows. Since brushed motors tend to wear out rapidly, many electric vehicle applications use brushless motors due to their long life span and noiselessness. Brushless DC motors are used for windshield wipers and CD players.

All of the recent hybrid electric vehicles depend on brushless DC motors. In applications with overhauling loads, it is important for the motor to have the ability to hold a full load at zero speed where mechanical brakes may not be required. In those situations, DC motors are the most cost effective and safest option. A major benefit of their use is their size and weight.

Conveyor systems require constant speed and high torque, which makes DC motors an ideal option. As has been found with other applications, DC motors have high torque at start up and even consistent speed. Brushless DC motors are the most commonly used for conveyor applications.

They are noiseless and can be easily controlled, a major requirement for conveying systems. Ceiling fans made with DC motors have become extremely popular. They use less power and have a rapid start up torque. The alternating current in a home or office is easily converted to DC power by a transformer, an effect that decreases the amount of power required by the fan. As with other DC motor applications, brushless DC motors are most commonly used in ceiling fans.

DC motors have been the main driving force behind pumps for several decades because of their variable speed control, simple control system, high starting torque, and good transient response.

For many years, pumping systems depended on brushed DC motors as their primary source of energy. The development of permanent magnet DC motors and brushless DC motors have offered a more beneficial option for pump system operations.

In high speed elevators, AC motors are impractical due to their difficulty decelerating and accurately leveling with the floor. These problems are overcome with DC motors because they allow for infinite control of their speed by varying the current supplied to the armature.

As with ceiling fans, the operation of a DC motor for elevators depends on changing the incoming AC current to DC current through the use of a transformer. There is an ever growing demand for DC motors, especially 12 V and 24 V models. The expanding market of solar, marine, and truck mounted equipment have come to depend on DC motor technology as an exceptionally cost effective solution.

Though DC motor technology is older than AC motor technology, DC motor manufacturers are constantly developing and engineering methods to reduce motor maintenance and extend motor life. The many types of DC motors are adaptable and adjustable to fit a wide variety of applications. Constantly discussed in regard to DC motors is their high startup torque.

Sign up for our Newsletter! Mobile Newsletter banner close. Mobile Newsletter chat close. Mobile Newsletter chat dots. Mobile Newsletter chat avatar. Mobile Newsletter chat subscribe. Solid State Electronics. How Electric Motors Work. Electric motors are everywhere. Inside an Electric Motor " ". You might be surprised to find out just how much work is done by electric motors. You flip the magnetic field by changing the direction of the electrons.

How a DC Motor Works " ". There are two magnets in the motor here: The rotor in green is an electromagnet, while the field magnet is a permanent magnet. Toy Motor " ". From the outside you can see the steel can that forms the body of the motor, an axle, a nylon end cap and two battery leads. Rotor, Commutator and Brushes " ". Putting It All Together When you put all of these parts together, what you have is a complete electric motor. It causes the motor to have better dynamics.

In a two-pole motor, if the electromagnet is at the balance point, perfectly horizontal between the two poles of the stator when the motor starts, you can imagine the rotor getting "stuck" there.

That never happens in a three-pole motor. Each time the commutator hits the point where it flips the field in a two-pole motor, the commutator shorts out the battery for a moment.

This shorting wastes energy and drains the battery needlessly. A three-pole motor solves this problem as well. The parts inside an AC motor are: Advertisement. Stator Rotor Solid axle Coils Squirrel cage. An industrial type of AC motor with the electrical terminal box at the top, the output rotating shaft on the left, and the squirrel cage covering it.

AC Rotor and Stator The key to an AC induction motor, where the field of the rotor is induced by the field of the stator, is that the rotor is always trying to catch up. Motors Everywhere!

Starting in the kitchen, there are motors in: The fan over the stove and in the microwave oven The blender The refrigerator - Two or three in fact: one for the compressor, one for the fan inside the refrigerator, as well as one in the icemaker The stand mixer. The washer The dryer The electric screwdriver The vacuum cleaner The electric drill The furnace blower. The fan The electric toothbrush The hair dryer The electric razor. Power windows Power seats Fans for the heater and the radiator Windshield wipers The starter motor An AC motor might power your car rather than a gasoline engine.

AC motors are generally considered to be more powerful than DC motors because they can generate higher torque by using a more powerful current. However, DC motors are typically more efficient and make better use of their input energy. Both AC and DC motors find application in processes and facilities in almost every industry. Some of the most common industrial applications for AC motors include:.

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