DC Motor Speed Control

DC Motor Speed Control devices can be found in different electronic machines. Speed control in such a device often shows an immediate effect on the DC motor rotation, thereby showing a direct relationship to the overall performance and output of such a machine.

DC Motor Speed Control

There are different kinds of DC Motor Speed Control devices available in the market. Most of these controls work based on a switching mechanism. These devices have several steps associated with arming and disarming, switching between various pulse widths, and even some types of pulse width selections.

DC motor operates on direct current, converting the received electrical energy into mechanical energy. This causes a rotation change in the device itself, thereby providing power to run various applications in multiple areas. A DC motor is a motor that converts direct current into mechanical work.

It works according to the principle of Lorentz’s law, which states that a conductor with a current, placed in a magnetic and electric field, experiences a force. DC motor speed control is one of the most useful motor functions. By controlling the motor speed, you can change the motor speed as required and get the work you need.

Control speed

The speed of dc motor can be controlled manually and automatically. This is different from speed regulation, where a change in shaft load can control speed versus a natural change in speed. The main function of DC motor speed control is to control the amount of direct current (DC) power produced by a DC motor. The rotational motion of a DC motor will always directly depend on the current source.

Speed ​​control mechanisms are used in many applications, such as controlling the movement of robotic vehicles, the movement of motors in paper mills, and the movement of motors in elevators, where various types of DC motors are used. DC motor speed control is one of the most useful motor functions. The motor speed is directly proportional to the motor supply voltage.

DC power is used in our devices and electronic devices such as cameras, ovens, car remote controls, personal digital assistants (PDAs), cell phones, and medical devices. The DC power supply is also used to heat the water. The energy is converted to AC energy and then back to DC energy at the end of the cycle. Controlling DC over time can create a dangerous situation where the overall energy consumption of an organization can increase.

DC Motor Speed Control Method

1: Flux Control Method

2: Armature Control Method

1: Flux Control Method

DC motor speed is inversely proportional to the flux. This can be done by reducing the flow, increasing the speed,A rheostat is added to the series with the fail winding to control the flow. Adding more resistance to the series with field winding will increase the speed and decrease the flow.

Therefore, this method is quite effective. Although this method can be used to reduce the magnetic flux and increase the speed rating value, it limits the maximum speed because weakening the field flow beyond a certain limit can make the journey worse. Will be affected.

2: Armature Control Method

The rotor winding is called armature winding. When a DC source drives both the armature and the field windings, current flows through the windings, and a magnetic flux proportional to the current is created. When the flow of the field interacts with the flow of the armature, it causes the rotor to move. Armature control is the most common method for controlling DC motors.

The speed of a DC motor is directly proportional to the back EMF Eb and Eb = V – IaRa. This means that when the supply voltage V and the armature resistance are kept constant, the speed is directly proportional to the armature current.

For this, either the stator voltage is kept constant, or the stator coils are replaced with a permanent magnet. In the latter case, the motor is called a permanent magnet DC motor and is only driven by the armature coils.

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