Magnetizing system

A magnetizing system for magnetizing a magnetic workpiece to the desired magnitude, comprising a variable electric source, magnetization exciting means excited by said variable electric source to generate a magnetic flux in a direction in which said magnetic workpiece is magnetized or demagnetized, a sensor circuit including magnetically sensitive means for producing an output in response to a quantity of magnetization of said magnetic workpiece to sense said quantity of magnetization of said magnetic workpiece, a comparison circuit connected to said sensor circuit to compare the sensed result with a reference to produce an output in accordance with the result of the comparison, and a control circuit responsive to said output from said comparison circuit to control the excitation of said excitating means;

• and wherein said variable electric source comprises of a constant electric source and a variable circuit connected to the output of said constant electric source;
• and wherein said constant electric source comprises an AC source of constant voltage and said variable circuit comprises a semiconductor element phase-controlled by said control circuit;
• and wherein said control circuit includes a logic circuit having an output from said comparison circuit applied thereto, said logic circuit composed of an integrating circuit responsive to an output from said logic circuit, and a conduction signal generator circuit response to an output from said integrating circuit to generate a conduction control timing signal for controlling the conduction of said semiconductor element forming said variable circuit.

A magnetizing system for magnetizing a magnetic workpiece to the desired magnitude, comprising a variable electric source, magnetization exciting means excited by said variable electric source to generate a magnetic flux in a direction in which said magnetic workpiece is magnetized or demagnetized, a sensor circuit including magnetically sensitive means for producing an output in response to a quantity of magnetization of said magnetic workpiece to sense said quantity of magnetization of said magnetic workpiece, a comparison circuit connected to said sensor circuit to compare the sensed result with a reference to produce an output in accordance with the result of the comparison, and a control circuit responsive to said output from said comparison circuit to control the excitation of said excitating means;

• and wherein said variable electric source comprises of a constant electric source and a variable circuit connected to the output of said constant electric source;
• and wherein said constant electric source comprises an AC source of constant voltage and said variable circuit comprises a semiconductor element phase-controlled by said control circuit;
• and wherein said constant electric source comprises an AC source of constant voltage and said variable circuit includes a magnetization variable circuit connected at one end to said AC source of constant voltage and at the other end to said magnetization exciting means and a demagnetization variable circuit connected at one end to said AC source of constant voltage and at the other end to said demagnetization exciting means, the arrangement being so that, said control circuit excites a selected one of said magnetization and demagnetization exciting means through the variable circuit connected to said selected exciting means;
• and wherein said variable circuit comprises a thyristor;
• and wherein said comparison circuit comprises a magnetization comparison circuit and a demagnetization comparison circuit.

A magnetizing system for magnetizing a magnetic workpiece to the desired magnitude, comprising a variable electric source, magnetization exciting means excited by said variable electric source to generate a magnetic flux in a direction in which said magnetic workpiece is magnetized or demagnetized, a sensor circuit including magnetically sensitive means for producing an output in response to a quantity of magnetization of said magnetic workpiece to sense said quantity of magnetization of said magnetic workpiece, a comparison circuit connected to said sensor circuit to compare the sensed result with a reference to produce an output in accordance with the result of the comparison, and a control circuit responsive to said output from said comparison circuit to control the excitation of said excitating means;

• and wherein said variable electric source comprises of a constant electric source and a variable circuit connected to the output of said constant electric source;
• and wherein said constant electric source comprises an AC source of constant voltage and said variable circuit comprises a semiconductor element phase-controlled by said control circuit;
• and wherein said constant electric source comprises an AC source of constant voltage and said variable circuit includes a magnetization variable circuit connected at one end to said AC source of constant voltage and at the other end to said magnetization exciting means and a demagnetization variable circuit connected at one end to said AC source of constant voltage and at the other end to said demagnetization exciting means, the arrangement being so that, said control circuit excites a selected one of said magnetization and demagnetization exciting means through the variable circuit connected to said selected exciting means;
• and wherein said variable circuit comprises a thyristor;
• and wherein said control circuit includes a logic circuit having an output from said comparison circuit applied thereto, said logic circuit is composed of an integrating circuit responsive to an output from said logic circuit, and a conduction signal generator circuit response to an output from said integrating circuit to generate a conduction control timing signal for controlling the conduction of said semiconductor element forming said variable circuit.