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 the motor, a voltage control block for restricting a voltage output of the motor within a certain range in accordance with the rotation speed, and a current and voltage detecting block for monitoring a current flow of the motor.

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.

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.

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.

Abstract: In an electromagnetic stirring method, one or two electromagnetic inductors are provided to define an internal space therein or therebetween, a plurality of pairs of opposed magentic poles are provided on the inner side walls of the electromagnetic inductors defining the space, and the polarities of the magnetic poles are sequentially rotated by one or two power supply devices to generate a plurality of rotating flows of a molten metal as seen in a cross section thereof as it passes through the internal space defined by the electromagnetic inductors.