APPLICATION OF SYNCHRONOUS BRUSHLESS MOTORS IN ELECTRIC HAND TOOLS

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In recent years an increased interest has been observed in the synchronous brushless (SBL) motors. This interest refers both to the theoretical investigations of such a motor and to its practical realization.
Conducting research into the SBL motors, investigators apply different approaches. One of them is based on the conventional DC regulation using principles of the general theory of synchronous machines, while another approach considers the operation of such a motor with semiconductor switches and position sensors in a continuous transient process described by differential equations. Each of these approaches has its own advantages and disadvantages. Lately, the SBL motor is more often considered as a synchronous machine that operates in specific mode; in this case the analysis is comparatively simple and visual [1, 2].
One of the areas where a SBL motor could successfully be applied is electric hand tools. It is found that the application of brushed motors for this purpose has definite disadvantages – mainly associated with the collector and brushes (low level of safety, short lifetime, etc.) [3].
In this paper, the possibility to apply SBL motors (instead of brushed ones) in electric hand planes is analyzed.