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The application of 3-phase brushless motors (BLDC) are the latest trend for battery-powered hand tools. The advantages over a conventional brushed DC motor are: approximately two times the power of a similarly-sized brushed DC motor; more energy efficiency resulting in longer battery life; no brushes needing to be serviced; in equivalent applications, a brushless DC powered tool is significantly lighter than a brushed motor tool; the maximum rotation speed of a brushed motor is limited by the brushes, a brushless DC motor’s maximum rotation speed is limited only by the design of the motor; and electromagnetic interference, also known as EMI, is greatly reduced because there are no arching brushes. The only disadvantage of 3-phase brushless motors is the cost. This approach requires three half bridges instead of the two half bridges required for brushed DC motors. Normally, a more complex controller for controlling the brushless DC motor results in longer initial development time.
