dc motor

DC motor How it works :

A direct current (DC) motor is a motor that converts direct current into usable energy. The first DC motors were developed from the 1830s to the 1840s. Since these motors used batteries and the batteries were expensive and of poor quality, they were not commercially successful. Everything changed in the 1800s when the electrical grid was built and high-capacity batteries were invented. The first commercial DC motor entered the market. DC motors continued to be developed, but other types of motors, such as BLDC motors, were also developed. Therefore, the use of modern brushed DC motors is limited in many applications. How dc motors work. The rotor is usually inside the motor, while the stator is outside. The rotor has coil windings powered by DC current and the stator has permanent magnet or electromagnetic windings. When the motor is supplied with DC current, a magnetic field is created in the stator, which attracts and reverses the rotor magnet. This causes the rotor to start moving . The motor has a commutator to keep rotor to rotating. The rotor should not rotate when it follows the magnetic field, but in this case the commutator will reverse the current from the stator, reversing the magnetic field. This allows the rotor to continue moving.  DC Motor Applications -application examples where DC motors are also used :Crane Conveyor, pump, Fans, Mechanical Equipment,  Air Compressors, Toys, Car, Engine Starters.

Four Types of Direct Current (DC) Motors:-

there are four types of DC motors. as a DC motor always has two main parts: the rotor and the stator. Permanent Magnet DC Motor ,Series Motor, Parallel Motor, Compound Motor, Advantages and Disadvantages of DC Motors Brushed DC motors have advantages compared to starting and speed control. yield. These motors have high torque rates. DC motor is efficient and has high speed. Strong overload capacity and low electromagnetic interference. The disadvantage of DC motors is their body structure. This can cause sparks and mechanical wear. Therefore, the life of the DC motor is short and the maintenance cost of the motor is high. It also creates trust issues.

DC motors are simple in design and easy to control and are widely used to open and close dishes. In cars, they are often used to reverse, extend and open power windows. The low cost of these motors makes them suitable for many applications. However, a disadvantage is that the brushes and commutator wear out very quickly due to constant contact, requiring frequent replacement and maintenance time.

Stepper motors are driven by pulses; stepper motors are driven by pulses; Stepper motors are driven by pulses. It rotates an angle (light line) with each stroke. Since the rotation is controlled by the number of pulses received, these motors are widely used to complete the task. For example, they are often used to control paper feed in fax machines and printers because these devices can interfere with pulse counting by feeding paper in fixed steps. The delay can also be easily controlled because the motor immediately stops rotating when the signal pulse is interrupted.

In a synchronous machine, the rotation is synchronized with the frequency of the current product. These motors are often used to move turntables in microwave ovens; Reducing the power on the motor unit can be used to achieve the required rotation speed to heat food. In asynchronous motors, the rotation speed also varies depending on frequency. However, their movements are not consistent. In the past, these motors were mostly used in electric fans and washing machines.

There are many types of engines commonly used. In this session we will look at the benefits and applications of brushless DC motors.

Whydo BLDC motors rotate:-

As the name suggests, brushes are not used in brushless DC motors. In brushed motors, the brushes rotate into the rotor’s coils and carry current. So how does the inertial body send current to the rotor coil? This is not a problem since the coil is not above the rotor. In contrast, the rotor is a permanent magnet; the coils do not rotate but are fixed to the stator. Since the coil does not move, brushes and commutators are not needed.

In brushed motors, rotation is achieved by controlling the magnetic field created by the rotor coils, while the magnetic field created by the permanent magnet remains safe. To change the rotation speed, you change the voltage of the coil. In the case of BLDC motor, it is the rotating permanent magnet; The rotation is achieved by changing the direction of the magnet produced by the surrounding fixed coils. To control the rotation, you adjust the magnitude and direction of the current flowing into the coils.



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