Find a solution: What does “brushless motor” mean?


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Brushless motors are more expensive to produce than their counterparts, but their benefits outweigh the initial cost. (DepositPhotos) The latest development in power tools is the use of brushless motors. But what exactly is a brushless motor, and what are its benefits? To fully understand this technology, let’s take a quick look at the current technology: polished motors. How polished motors work In a typical electric motor, there is a permanent magnet (stator) on the outside, and a rotor (rotor) on the inside. The rotor contains an electromagnet. When electricity passes through the electromagnet, it creates a magnetic field inside the rotor that attracts and repels the permanent magnet in the stator, however, to make the motor rotate 360 ​​degrees, it is necessary to change the polarity of the electromagnet and a pair of brushes help to do so The motor brushes are not brushes at all, But they are small blocks of carbon attached to a pressure spring. The brushes press against the rotating electrodes attached to the rotor. When the electromagnet rotates, the magnetic polar brush changes, polished motors are reliable, relatively efficient and inexpensive to manufacture, but they have distinct limitations, firstly, carbon brushes wear out at the end and must be replaced. While the engine is running, the brush is constantly broken and then makes electrical contact, which produces spark and noise. Friction caused by brush friction with the rotor rotor causes the motor to overheat. Brushes limit the maximum speed of the motor, and for these and other reasons, all major tool manufacturers have now added brushless motors to their portable power tool kit. Brushless versus brushless motor, in a brushless motor, there are no brushes of any kind and the motor itself turns from inside to outside: permanent magnets are transferred to the rotor, electromagnets are connected to the stator, then instead of brushes, the computer connected to high-power transistors Charging an electromagnet as a motor There are several advantages of a brushless motor. For example, there are no brushes to wear or replace, the motor runs quieter and cooler, there is no electric spark, and the operating time of cordless tools is increased by up to 50% compared to the similar brushed motor. Controlled, it delivers the exact amount of power needed for the job, for example, the motor can sense whether you are drilling a inch hole in drywall or a 2 inch hole in a steel door, then provide the correct amount of torque (force ). By contrast, smooth motors run at maximum speed regardless of function. Well, at this point, I am sure you are thinking that brushless motors are pretty cool; There should be a problem, well, there is no exact problem, but the cost of producing brushless motors is more than that of conventional polished motors, however, the initial cost is often recovered by increasing tool efficiency and longer life, and with the increase in brushless motors. Ultimately, prices will decrease.


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