They are installed on the fixed part of a motor to ensure optimal transmission of power to the rotor (the rotating part). Carbon brushes are chosen according to the brand and type of tool. The majority of brushless have an internal rotor that turns fast up to 100,000 rpm.īrushes are essential for the proper functioning of brushed motor tools, such as drills, jackhammers, planers, hedge trimmers and grinders. The windings can be built in different ways either in the form of a star or triangle. They come with a fixed stator, which holds the coils and a mobile rotor on which the permanent magnets are glued. It is understandable that with this power principle, the coils are fixed in the motor and do not rotate as in brushed motors.Īll the brushless motors have a relatively similar design. This transforms the DC current into a three-phase variable-frequency current and supplies the motor coils successively to create the rotating field. In a brushless motor, the commutation of the windings is not mechanical but electronically driven by a device known as a controller. In addition, brushless units significantly reduce maintenance, which comes down to dusting and there is no need to replace worn brushes. For this reason, brushless motors are better adapted, generate no friction, produce less heating and provide better performance. The main difference between brushless or brushed drill motors is that the brushed variants are made of carbon while the brushless units use magnets to generate power. In turn, customers are taking advantage of key benefits associated with variety and reduced maintenance requirements. This has transformed the way drill manufacturers produce efficient drilling tools. Improvements to the brushless motor have continued unabated over the last three decades. The greater availability of permanent magnets combined with high-voltage transistors has allowed this type of motor to generate as much power as brushed motors. However, it was not until the 1980s that the brushless motor really got off to a good start. The major revelation behind the concept of the brushless motor was the absence of a physical switch to transmit the current. The units were equipped with a technology that leveraged magnetism and successively opposed by an electric device. Trickey published an article describing a brushless motor operating on direct current. The brushless motor’s journey to prominence began in the early 1960s with the arrival of a power dimmer that had the capacity to convert alternating current (AC) to direct current (DC). Although rudimentary, the inventions have undergone a number of improvements over the decades, one of which was a rheostat for precisely controlling the rotational speed of the shaft.
To understand its origin, it is important to look back to inventions by Mr.
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