The difference between brushless DC motor and brushed DC motor

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A DC motor is a motor that converts DC electrical energy into mechanical energy. Due to its good speed regulation performance, it is often used in electric transmission. DC motors can be divided into brushless DC motors and brushed DC motors. This article CNS Motor Technology introduces the working principle and application of brushless DC motors. Secondly, the principles and applications of brushless DC motors are explained .

The brushless DC motor consists of a motor body and a driver, and is a typical electromechanical integration product. The stator winding of a motor usually consists of a three-phase symmetrical star connection, which is very similar to a three-phase asynchronous motor. Magnetized permanent magnets stick to the motor’s rotor. The position sensor is installed inside the motor and is used to detect the polarity of the motor rotor. The driver consists of power electronics and integrated circuits. Its function is to receive the engine’s start, stop and braking signals to control the engine’s start, stop and braking, receive position sensor signals, and control the forward and reverse signals of the reverse gear switch. Each variable axle power tube generates continuous torque, accept speed instructions and speed feedback signals, control and adjust speed, provide protection and display, etc.

The DC motor responds quickly, has large starting torque, and can output rated torque from zero to rated speed. However, due to the advantages of the motor, the DC motor also has the disadvantage of producing DC rotation under rated load. For torque output, the armature magnetic field and the rotor magnetic field must be kept constant at 90°, which requires the use of carbon brushes and commutators. When the motor rotates, the carbon brushes and commutator produce sparks and carbon dust. Therefore, in addition to component damage, possible uses are also limited. AC motors have no carbon brushes or commutators, require no maintenance, are sturdy and durable, and can be used in a wide range of applications. However, to achieve comparable performance to a DC motor, sophisticated control techniques can be used to achieve this. Currently, in order to improve the performance of drive motors, the switching frequency of semiconductor devices continues to increase. The speed of microprocessors is also getting faster and faster, realizing the control of AC motors in the rotating two-axis Cartesian coordinate system, so that the current components of the AC motors are properly controlled on the two axes, thus achieving performance equivalent to that of DC motors. Similar control of DC motors.

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