Motor control circuit for paper shredders

Details Motor control circuit for paper shredders Motor control circuit for paper shredders

2006-02-14

2006-02-14

Rosenbaum, Mark (Department: 3725)

Solid material comminution or disintegration

Processes

Miscellaneous

C241S036000, C241S236000

Reexamination Certificate

active

06997408

ABSTRACT:
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 cutter having an inverted linear flow characteristic between rotation speed and torque and a control circuit composed of 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. While a voltage is decreased on account of motor rotation speed which correlates negatively with a torque increase of said motor in shredding papers, when a voltage is restricted to a minimum by said voltage control block, an operation of said motor is to be suspended or reversed in the case that a current detected by said current and voltage detecting block exceeds a certain level. If a motor current detected by said current and voltage detecting block exceeds a certain level, a motor operation is to be suspended or reversed by a delaying circuit.

REFERENCES:
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patent: 0048737 (2000-08-01), None

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