Patent ID: 6997408
Filing Date: 2006-02-14
Classification: B02C,H02P,Y02P

Abstract:
1. A motor control circuit for paper shredders comprising of a paper shredder that is composed of a driving motor for a rotary cutter having an inverted linear flow characteristic between rotation speed and torque, a detecting block for said rotation speed of said motor, a voltage control block for restricting a voltage output of said motor within a certain range in accordance with said rotation speed, and a current and voltage detecting block for monitoring a current flow of said motor; and characterized by: decreasing a voltage gradually in accordance with decreasing of said rotation speed which correlates with a torque increase of said motor in shredding papers, and suspending or reversing a motor operation in the case that a current detected by said current and voltage detecting block exceeds a certain level when a voltage is restricted to a minimum within said certain range by said voltage control block.