# Difference between brushless motor and Brush Motor

by：V&T Technologies     2020-01-25
Brushless motors and Brush Motors. For several years, we have been seeing brushless motors dominate the advanced power tool industry. Is there really a difference in using brushless superbrush Motors? Yes, exactly. There are significant differences between them. Let's look at the basic knowledge of DC motors. DC motors are about magnets and electromagnetism. Magnets with opposite charges attract each other. The main idea behind the DC Motor is to keep the opposite charge of the rotating assembly in front of the fixed magnet (Stator)On, thus generating a constant pulling force. This kind of forward pulling is generated by the physical behavior of electromagnetism. Principle: based on the following principle: when the current-carrying conductor is placed in a magnetic field, it will be subjected to mechanical force. The direction of the mechanical force is given by Fleming's left-hand law, and its magnitude is given by the force, F = BI l Newton, where B is Weber/m2 magnetic field. I is the current (In amperes), L is the length of the coil (In meters). Force, current and magnetic field are all in different directions. Structural difference: The brush inside the motor is used to transfer current to the motor winding through commutator contacts. Brushless motor does not have current-carrying commutator. The magnetic field inside the brushless motor passes through the reversing device (Such as optical encoder)The triggered amplifier is switched. Brush DC motor adopts winding coil configuration, I . e. armature, which is used as bipolar electromagnet. Commutator (A mechanical rotary switch) The direction of the current is reversed twice in each cycle. This facilitates the flow of current through the armature. Therefore, the magnetic poles of the electromagnet pull along the outside of the motor and push the permanent magnet. Then, when the magnetic pole of the electromagnet of the commutator crosses the magnetic pole of the permanent magnet, the polarity of the commutator is reversed. In contrast, brushless motors use permanent magnets as their external rotors. In addition, it uses a three-phase drive coil and a special sensor to track the rotor position. When the sensor tracks the rotor position, it sends a reference signal to the controller. The controller activates the coil in a structured manner in turn-One meets the other. TAG brushless motor
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