Discount tool motor Power tools are mostly series motors with electric brushes inside. The motor has the characteristics of small size, high power and high speed. But cannot work for long periods of time. Most of the motor speed control of electric tools is the same, and the speed is adjusted by outputting a mechanical deceleration mechanism. The speed-regulating motor consists of a tapered driving wheel and a pressure plate that are compressed by a set of disc springs. The input shaft and the driving wheel are connected by a key to form a compressed driving device. A set of tapered planetary friction wheels are sandwiched between the compressed driving wheel and the pressure plate on the inner side, and the outer side is sandwiched between the tapered fixed ring and the speed control cam to form a friction pair; when the compressed driving device is running At this time, the friction wheel does pure rolling. Because the fixed ring and the speed control cam do not move, the friction wheel revolves while rotating, and drives the planet carrier to rotate through the central shaft of the planetary friction wheel and the slider bearing. While turning the handwheel to drive the speed control cam to change the angular position, the end surface curve of the speed control cam acts on the flat pin clamp and the end surface curve of the fixed cam to cause the speed control cam to move axially, thereby uniformly changing the speed control cam and the fixed ring The interval between the tapered planetary friction wheel produces radial movement.
Finally, the working radius of the friction between the planetary friction wheel and the driving wheel, the pressure plate and the fixed ring, and the speed control cam is uniformly changed to realize stable stepless speed change.
