DC brushed motors also have wide applications in the transportation industry. For example, in urban rail transit traction systems, DC motors, with their powerful torque output and reliable performance, provide power support for the smooth operation of trains. In the electric vehicle field, DC motors were more common in early models, as they can provide a large starting torque in a short time, meeting the needs of rapid vehicle acceleration.
In the aerospace field, brushless DC motors are equally indispensable. For example, in the attitude control systems of some satellites, DC motors can precisely adjust the satellite's attitude and orientation, ensuring the satellite's normal operation and communication. From a historical perspective, the development of DC motors has been a long process. DC motors were first invented in the 19th century, and with continuous technological advancements, their performance and application scope have expanded. From the initial simple mechanical drive to their widespread application in high-tech fields today, the development of DC motors has witnessed the tremendous progress of human industry and technology. Hello everyone, I'm Machine Panda. In real life, we encounter many types of motors, among which permanent magnet motors account for a large portion. Most of these motors operate based on the principle of interaction between the stator and rotor magnetic fields. Among these, those motors driven by DC power supplies are called DC motors, which are further divided into brushed DC motors and brushless DC motors. Now, let's delve into the working principle and applications of brushed DC motors. Brushed DC motors, also known as Brushed DC or BDC motors, have core components including a stator, rotor (armature), and brushes. These components together constitute the basic working framework of a brushed DC motor. The stator, as a stationary component in a DC brushed motor, provides a stable magnetic field for the motor. The rotor, also known as the armature, is the rotating part of the motor, rotating under the influence of the stator's magnetic field.
This rule is used to determine the direction of the force on a current-carrying conductor in a magnetic field. Specifically, extend your left hand, making your thumb perpendicular to your other four fingers and in the same plane. Imagine magnetic field lines flowing into your palm, and point your four fingers in the direction of the current flow. The direction your thumb points is the Ampere force, i.e., the direction of the force on the conductor. This rule is also used to determine the direction of the induced electromotive force (EMF) generated when a conductor cuts magnetic field lines in a magnetic field. Specifically, extend your right hand, making your thumb perpendicular to your other four fingers and in the same plane. Imagine placing your right hand in a magnetic field, with magnetic field lines perpendicularly entering your palm, and your thumb pointing in the direction of the conductor's motion. The direction your other four fingers point is the direction of the induced EMF.
In an electric motor, the brushes and stator remain fixed and do not move, while the armature (including the armature shaft, windings, and commutator) is fixed together and rotates. Using the left-hand rule, we can understand that when a current-carrying conductor is in a magnetic field, it experiences a force. Furthermore, every time the armature rotates 180°, the commutator reverses the direction of the current in the conductor, ensuring that the armature continues to rotate in one direction. In reality, there are various winding methods, and each method corresponds to a different number of commutator groups. Here, we will not delve into the details but will use a drum-shaped winding as an example to help you understand its winding method more intuitively. The working principle of a generator is essentially the reverse operation of an electric motor. When the conductor is not energized, we manually rotate the armature, and the conductor cutting the magnetic field lines thus generates an induced electromotive force (i.e., current).
Next, we will discuss the classification of brushed DC motors. Among them, the permanent magnet brushed DC motor (PMDC) is the most widely used BDC motor. This type of motor uses permanent magnets to generate a stator magnetic field and has a significantly linear performance curve, meaning that voltage and speed have a linear relationship. Simultaneously, because its stator magnetic field remains constant, the PMDC motor responds very quickly to voltage changes. However, the magnetism of the permanent magnet gradually decays over time, which is the main drawback of the PMDC motor. The shunt-wound brushed DC motor (SHWDC) is characterized by its field coil being connected in parallel with the armature. This makes the current in the field coil independent of the current in the armature, thus giving this type of motor excellent speed control capabilities. Compared to the permanent magnet brushed DC motor (PMDC), the SHWDC motor does not have the problem of magnetic decay, therefore its reliability is generally higher.
Brushed DC motors, or simply brushed motors, are a type of electric motor with a long history. Their operating principle is deeply rooted in the law of electromagnetic induction. Compared to brushless motors, brushed motors exhibit unique characteristics in their construction and operation. Brushes and commutators (rectifiers) are indispensable elements in the construction of a brushed motor. Inside the motor, the brushes are in close contact with the commutator rings (rectifiers) on the rotor shaft, working together to complete the transmission and conversion of direct current. This unique design allows the brushed motor to smoothly introduce direct current from an external power source into the rotor windings through the brushes, thereby driving the motor to rotate. The rotor windings are made of tightly wound conductive coils. When direct current passes through these coils, it generates a strong magnetic field. This magnetic field interacts with the magnetic field generated by the stator, thus producing torque, which in turn drives the motor to rotate efficiently and smoothly.
The stator, as the stationary part of the motor, is typically equipped with permanent magnets or electromagnets, and its core function is to generate a stable magnetic field. When direct current flows into the rotor windings through the brushes and commutator, a magnetic field that dynamically changes with the direction of the current is formed within the windings. This magnetic field interacts with the fixed magnetic field generated by the stator, thus producing a torque that causes the rotor to rotate. During rotor rotation, the commutator continuously adjusts the contact point between the brushes and the windings to ensure that the current direction and the magnetic field direction remain synchronized, thereby maintaining the continuous rotation of the motor. Brushed motors are characterized by their simple structure and low manufacturing cost. However, due to the mechanical friction between the brushes and the commutator, they require regular maintenance and brush replacement to ensure continuous operation. In terms of efficiency, brushed motors are relatively inefficient due to the sparks and heat generated by brush friction, and they also produce noise and electromagnetic interference. However, their control circuits are relatively simple, and starting and speed adjustment are easy, which makes brushed motors widely used in toys, home appliances, power tools, and model airplanes. Nevertheless, with the increasing demands for high performance and high reliability, brushed motors are gradually being replaced by brushless motors in these fields. However, brushed motors still hold a place in some applications due to their cost-effectiveness and ease of control.
In addition, brushed motors come in various models, such as RS-548SH. These models of DC brushed motors are suitable for applications requiring medium to high performance, such as model airplanes and remote-controlled vehicles.
Detailed Explanation of Brushed Motors (370, 380, 540):
These model numbers primarily indicate the length of the motor housing, such as 37mm, 38mm, and 54mm. Their diameters also differ; for example, the 370 and 380 models have a diameter of approximately 28mm, while the 540 and 550 models have a diameter of 36mm. These motors are widely used in small appliances, toys, and model airplanes.
Detailed Explanation of the 130 Motor:
The 130 motor is a general classification of motor sizes, commonly used to describe a range of small DC brushed motors. These motors play an important role in toys, small fans, and many other applications.
DH series motors:
DH series motors may be designed for specific brands or applications and are suitable for specific operating conditions, such as altitude limitations, ambient temperature requirements, and special environmental conditions such as the absence of corrosive gases.
GR53x30 and GR53x58 motors:
These two types of motors may be of different sizes or specifications, each with unique applications and performance characteristics. However, further information is needed to elaborate on the specific details and applicability.
This is a DC brushed motor from the German brand DUNKERMOTOREN, with specific technical parameters and applications, such as industrial automation and medical devices. The models mentioned above represent only a small fraction of the many brushed motors available. In reality, a vast array of brushed motors exist on the market, each manufacturer employing its own unique naming and classification system. These motors cover a wide range, from miniature to high-power models, meeting diverse needs from consumer electronics to industrial applications. When selecting a model, factors such as the application scenario, required power, speed requirements, size constraints, and budget must be considered to determine the most suitable option.
