UPDATE : 2017-09-06
of brushless electric tools are their brushless motors and controllers. As both
load and speed of electric tools change in work, they are required of good
torque output whenever they are moving fast or slow.
most brushless electric tools are applied with Hall control. Their controllers can
decide the positions of motor rotors by feedback codes sent by Hall sensors and
thus the motors can operate continuously in a controlled manner.
development, some electric tools are now powered by lithium batteries to render
lower power consumption. In this case, they can be used for a longer time once
charged. Lower power consumption and wider voltage range become development
direction of the industry.
LiBrave is now working on this kind of Hall circuit and will launch its product
magnet: bonded NdFeB.