A collection of common knowledge about brushed DC motors

What is a Brushed DC Motor?
A DC brushed motor, also known as a DC brushed motor, is a motor that converts direct current into mechanical energy. Its operating principle is to use the electromagnetic force of direct current to make the motor rotate. The motor has an armature with a rotating permanent magnet pole, the armature consists of a number of windings, and there are some brushes in the windings. When current is passed through the armature, the brushes come into contact with the rotating permanent magnet, creating an electromagnetic torque that turns the motor. Since the brushes need to be replaced periodically, this motor is called a brushed motor.

What is it mainly composed of?
The structure of the brushed DC motor mainly includes two parts: the stator and the rotor. The stator is the static part of the motor, consisting of iron core, coil and end cover. The iron core is made of stacked silicon steel sheets, which can effectively reduce hysteresis and eddy current loss and improve the efficiency of the magnetic circuit. The coil is composed of windings and insulation, which converts the current into magnetic force and drives the rotor to rotate. The end cover plays the role of fixing the stator coil and protecting the iron core.

The rotor is the moving part of the motor and consists of an iron core, brushes and permanent magnets. The iron core is also made of silicon steel sheets stacked to improve the efficiency of the magnetic circuit. The brush is to obtain electrical energy from the power supply and transmit it to the coil of the rotor to generate a magnetic field, which then drives the rotor to rotate. A permanent magnet is a special material with permanent magnetism. Its magnetic field interacts with the magnetic field generated by the motor, creating a torque that turns the rotor.

In actual production, the raw materials used in brushed DC motors mainly include copper wires, silicon steel sheets, brushes, permanent magnets, etc. Copper wire is a very high-quality conductor material, which can effectively reduce resistance and energy loss. Silicon steel sheet is a special steel sheet with high magnetic permeability and low electrical resistance, which is used to improve the efficiency of the motor. Brushes are electrodes made of various materials that come into contact with the rotating rotor to transfer electrical energy. Permanent magnets are high-quality magnetic materials, including different types of materials such as neodymium iron boron, cobalt steel, and alnico iron.

The structure of the small brushed DC motor includes two parts, the stator and the rotor, which are composed of copper wires, silicon steel sheets, brushes, permanent magnets and other raw materials. The high-quality performance of these materials can ensure the efficient operation and long life of the motor, providing reliable power support for various applications.

What is the working principle?
A brushed DC motor is a common motor, and its working principle can be simply summarized as using the action of current between the stator and the rotor to make the motor rotate. Next, let's take a closer look at the working principle of a brushed DC motor.
1. Principle
The basic structure of a brushed DC motor is composed of a stator, a rotor, a brush, a collector ring, a bearing, and a casing. Among them, the stator is equipped with coils, and corresponds to two different brushes successively. The rotor is fitted with permanent magnets and a slip ring. When the coils in the stator are energized, a magnetic field is generated. At the same time, the magnetic field generated by the permanent magnets on the rotor interacts with the magnetic field of the stator, causing the rotor to start rotating. When rotating, the collector ring will continuously contact and disengage with the brush, so as to realize the conversion of electrical energy into mechanical energy. The speed of the motor is directly proportional to the magnitude of the current.
2. Working process
When the motor starts to work, the coil on the stator will generate a magnetic field, and the direction of this magnetic field is determined by the direction of the current in the coil, which is called the magnetic field polarity. Therefore, the positive and negative directions of the current will affect the steering of the motor when the motor is working. After the motor starts, the rotor starts to rotate.
When rotating, due to the contact and disengagement of the collector ring on the rotor and the brush, the direction of the current will be reversed, that is to say, the sign of the current is constantly changing, so that the direction of the magnetic field is also constantly changing. This in turn affects the direction and magnitude of the stator current, thereby affecting the direction and magnitude of the magnetic field.
Therefore, when the current and the rotor rotate, the generated magnetic field is constantly changing, so that the rotor is subjected to different magnetic forces, and the direction and magnitude of the magnetic force will affect the rotation and speed of the rotor. When the motor load is too large or stalled, the motor will stall or burn out.
A micro brushed DC motor is a mechanical device that can convert electrical energy into mechanical energy. Its working principle is to rely on the mechanical torque generated by the force of the magnetic induction line to achieve electrical energy conversion. Its structure is simple, easy to use, widely used and so on.

What are the advantages of brushed DC motors?
1. Low cost
The relatively low price of brushed DC motors compared to other types of miniature motors makes them the first choice for many applications. In addition, their maintenance costs are relatively low.
2. Quick response
The speed can be changed very quickly, and its response speed is very fast, and it can be accelerated or decelerated in a short time. Ideal for applications requiring fast response, such as robotics and automatic control systems.
3. High efficiency
Very efficient, they don't need to switch current types. This also makes them more energy efficient and reduces energy waste.
4. Easy to control
Speed and direction can be controlled with a simple controller, making them ideal for applications that require precise control, such as medical devices and automated control systems.
5. Good stability
Brushed DC motors ensure the stability and working life of the motor by using adjustable carbon brushes. These carbon brushes can be replaced periodically to extend motor life and maintain stability.

What are the internal structures of the brushed DC motor?
A brushed DC motor is a common type of electric motor. Its internal structure consists of stator, rotor, carbon brushes and electric brushes.
The stator is the stationary part of the motor and consists of the armature, poles, insulators, terminals and stationary parts. The armature is a component composed of several coils, usually copper or aluminum wires. The armature forms a complex three-dimensional structure on the stator, which can provide a variety of magnetic field shapes, making the performance of the motor have superior characteristics. The poles are where the electric field is generated and are mounted across the armature to cause current to flow back inside the armature. The insulator is the material that separates the armature from the poles to prevent short circuits between the armature and the poles. Terminals are the parts that connect the power source to the motor and are usually made of metal. The fixing part is the basic element for installing the motor.

The rotor is the dynamic part of the motor. It's the rotating part that makes the motor generate power through the interaction of electrodes and a magnetic field. The rotor has two parts, one is the ring-shaped iron core, and the other is the shaft in the center of the iron core. Electrodes are windings mounted on iron cores and consist of coils that are energized. The magnetic field is generated by the stator and formed around the center of the rotor so that the rotor can rotate under the action of the magnetic field.

The carbon brush is an object used to transmit current to the rotating parts of the motor. It connects the electric chatter on the rotor core through elastic contact. Shocks are fixed mechanisms within the motor that support the shims and other components by connecting iron frames. Carbon brushes are always a vulnerable element of commercial motors and if not functioning properly will cause the motor to fail.

Brushes are tools that transmit current through carbon brushes, and their shapes and functions are more diverse than carbon brushes. The brushes are mainly about the fixed springs with the carbon brushes pre-installed, sliding freely inside the motor so that the carbon brushes always keep in good contact with the rotating parts.

The internal structure of the brushed DC motor is complex but the key components include the stator, rotor, carbon brushes and electric brushes. Through the interaction of electric current and magnetic field, electric motors can generate power and carry out various applications, such as small motors, reflexive starter generators and high-voltage motors, etc. The development of the modern power industry requires more complex motors with more components, but the basic construction and stability characteristics have not changed.

How to prolong the service life of the motor?
Brushed DC motor is a very common motor that can be seen everywhere in our daily life. It is not only an important component in household appliances, but also plays an important role in mechanical equipment and industrial equipment. However, brushed DC motors have a short service life, so in order to maximize their service life, we need to take some measures.

The first thing to pay attention to is the usage environment. Brushed DC motors are suitable for use indoors or in dry areas, where the environment with high humidity will have a greater impact on them. In addition, users should also avoid placing the motor in direct sunlight or exposed to heat sources for a long time.

Secondly, pay attention to reasonable maintenance of the motor. When the motor is working, keep it clean and dry to prevent the motor from flying dust or getting moisture. At the same time, regularly check the brushes of the brushed DC motor, and replace the brushes and severely worn mechanical parts if necessary.

In addition, attention should be paid to the working load of the motor. If the motor is overloaded for a long time, it will accelerate the loss of the motor and reduce the service life. Therefore, in the process of use, the mechanical equipment in which it is located must be produced and used according to the rated load of the motor. Moreover, it is also necessary to avoid alternating use of short-term high loads and long-term low loads.

In short, correct use and maintenance is the key to prolonging the service life of brushed DC motors. Users need to pay attention to the environment, keep it clean and avoid overloading, so as to maintain the normal operation of the motor and prolong its service life.

What are the common problems and solutions of brushed DC motors?
Brushed DC motor is a commonly used type of motor. During use, it often encounters some common problems, such as loud noise, high temperature, unstable speed, etc. What should we do if these problems occur?

1. Loud noise
Noisy brushed DC motors are a common problem and can be caused by many factors, such as friction between the internal parts of the motor, mismatching the motor with the load, etc. There are several ways to solve this problem:
1. Replace the motor or reduce the power
High-power motors are prone to noise, and you can consider reducing the power of the motor or replacing it with a motor with a lower power when the use effect is guaranteed.
2. Change the motor installation position
The difference in the installation position of the motor will also lead to the difference of loud noise or low noise. Try to choose a location with relatively low noise to install the motor.
3. Check the internal parts of the motor
The wear of the brushes, bearings and other parts inside the motor will increase the noise. If the situation is serious, these parts need to be replaced to solve the problem.

Two, the temperature is too high
Excessive heating of the brushed DC motor will affect the stability of the operation and the life of the motor. This problem is usually due to the following reasons:
1. The motor load is too large
When the load is too large, the motor will be under greater pressure and generate higher temperature, so it is necessary to control the load to make it run more stably.
2. Poor insulation of the motor
Poor insulation of the motor will also lead to excessive heat generation of the motor. It is necessary to check the insulation before installing the motor to ensure normal operation.
3. Poor heat dissipation of the motor
Poor heat dissipation of the motor will also lead to overheating. It is necessary to increase the heat dissipation capacity of the motor, which can be solved by adding heat sinks and installing fans.

3. The speed is unstable
The problem of unstable speed is caused by the unstable output torque of the motor, which may be caused by the following reasons:
1. The power supply voltage of the motor is unstable
Power supply voltage fluctuations may affect the operation of the motor, and the stability of the motor's power input voltage can effectively solve this problem.
2. Motor internal failure
Faults inside the motor will affect its normal rotation. It is necessary to check the faults and replace the faulty parts in time.
3. The motor does not match the load
The mismatch between the motor and the load can affect the speed stability of the motor, and it is necessary to readjust the matching degree of the motor load and the output power of the motor.

The solutions to the common problems of brushed DC motors need to be selected in combination with the actual situation, and corresponding operations should be performed according to the needs. Only by ensuring the normal operation and maintenance of the motor can it provide better power support for production and life.

 

The above is the introduction of the relevant knowledge about brushed DC motors introduced by our VSD motor. For more knowledge and doubts, please contact us. Professional customer service staff will provide you with the most professional answers.