What type of motor is used in electric tools?
The speed regulating motor is composed of a taper driving wheel and a pressure plate, pressed by a set of disc springs, and the input shaft is connected with the driving wheel by a key to form a pressing active device. A group of tapered planetary friction wheel inside between the driving wheel and the pressing plate, lateral sandwiched between the taper ring and fixed speed cam, and friction; when the compression of the active device operation, the friction wheel to do pure rolling, the fixed cam ring and the governor does not move, so the friction wheel in the rotation for public transport, through the planetary friction wheel central shaft and a slider driven by planetary gear bearing rotation.
Most power tools are series excited motors with an electric brush inside. The motor has the characteristics of small size, high power and high speed. But you can't work long hours.Electric tools, motor speed is mostly motor speed unchanged, through the output of mechanical speed reduction mechanism to speed.
Turn the hand wheel drive speed change the angle of the cam to the position and speed curve of the cam face and fixed by the flat marbles clip the role of the cam face curve, so that the axial movement speed cam, and even change between the speed cam and the fixed ring spacing, the taper produces planetary friction wheel radial movement. Finally, the working radius of the friction gear between the planetary friction wheel and the driving wheel, the pressure plate and the fixed ring and the speed regulating cam is changed uniformly, and the stable stepless speed change is realized.
