Optimization of iron-cored electro magnets for biomedical...

Details Optimization of iron-cored electro magnets for biomedical... Optimization of iron-cored electro magnets for biomedical...

A - Human Necessities

61

N

326/3

A61N 5/00 (2006.01) A61N 2/02 (2006.01)

Patent

CA 1323907

ABSTRACT Disclosed is a method of optimizing the structure of an electromagnet so that when its coil is energized by electrical pulses of predetermined duration and amplitude the electromagnet induces voltages of first and second predetermined magnitudes in a standardized search coil located midway between pole faces of the iron core at times corresponding to the beginning and end of the pulses. The voltage induced in the search coil at the beginning of the pulses is measured and, if it is greater than the first predetermined magnitude, the number of turns of the coil is increased whereas, if it is less than the first predetermined magnitude, the number of turns is decreased. The voltage induced in the search coil at the end of the pulses is also measured and, if it is greater than the second predetermined magnitude, the gauge size of the wire forming the coil is reduced whereas, if it is less than the second predetermined magnitude, the gauge size is increased. Also, the coil current flowing at the end of the pulses is calculated and the point of intersection of the current with a saturation curve of the iron core is checked; if necessary, the cross-sectional area of the iron core is altered to ensure that the point of intersection is near the upper limit of the linear region of the saturation curve.

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