The concept of a brushed servo motor may be a little counter-intuitive-most of us believe that as a high-performance device, the servo motor is used in high dynamic applications, while the brushed DC motor is a kind of The low-cost application solution produced by others. And, to a large extent, this is correct. However, please remember that the servo motor is a very broad concept. It is any kind of motor with feedback that uses a closed loop system.
Brushed DC motors are also commonly referred to as permanent magnet DC motors because the stator contains permanent magnets in the inner diameter. The rotor (usually called the armature) consists of a slot iron core with windings embedded in the commutator. Permanent magnet DC motors are mechanically commutated, and their carbon brushes carry current to the windings. This is the opposite of a brushless DC motor-a type typically used in the servo field-which uses electronic commutation instead of mechanical commutation.
The mechanical commutation of a brushed DC motor seems to be a defect-the carbon brush is a worn part, which often requires maintenance and replacement-such a design is lower in cost than a brushless DC motor. And in terms of performance, the carbon brush servo motor has a smooth speed output (especially at low speeds), a wide speed range, and a good speed control, as well as the use of renewable energy to control the motor. (In addition, renewable energy can be input into the power source) For acceleration or starting, they can also generate high torque. Compared to other DC motors, carbon brush types are generally smaller and more efficient because they do not have an excitation coil.
There are two important characteristics of servo brushless motors that need to be kept in mind by engineers and designers. First, the rotor is the inside of the motor, and the heat dissipation path of the rotor is not very effective. Therefore, special attention should be paid to the heat dissipation characteristics of the motor. Secondly, the permanent magnets in the stator are partially demagnetized.
Manufacturers of permanent magnet DC motors-brushed servo motors-can use areas such as power seats, windows or windshield wipers as their main application areas. These features make them a popular choice for household appliances and small motors. In the industrial field, permanent magnet DC motors are usually used in equipment where torque is the main requirement.
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