In addition, power tools are required for the capability of forward and reverse rotation as well as operating at different speeds.īrushed direct-current (DC) motors have been employed for such applications because of their excellent torque-speed characteristics and ease of control. Therefore, technical performance and convenient operation in power tool design are becoming more and more essential, including factors such as smaller size, more robust operation, higher battery voltage driving capability and higher speed capability. The global power tools market is expected to increase at a compound annual growth rate of 5.5% and to reach US$41.7 billion during the period of time from 2019 to 2024. Due to their convenience and easy operation, they have been widely employed in automotive maintenance, construction and home repair as well as in plant and garden pruning. In recent years, power tools, also known as electric hand tools, have been applied in many areas of the machinery and mechanical industries.
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