A paper shredder enables to control power consumption and achieve energy saving by realizing a torque characteristic of low torque at high speed or high torque at low speed keeping an output of a motor within a steady level. This circuit adopts a paper shredder structured with a driving motor for a rotary...http://www.google.fr/patents/US7520452?utm_source=gb-gplus-shareBrevet US7520452 - Motor control circuit for paper shredders
