Experimental Studies on Iron Loss in a Parametric Motor

Parametric motors offer numerous attractive features not found in ordinary motors, such as overload protection, simple construction, low cost, and low noise. This paper discusses the mechanism of iron losses occurring in the cores of a parametric motor, with a view to further improving the motor's characteristics and putting it to practical use. It is shown that the greater part of the iron loss in the motor occurs in the common magnetic circuit, and is caused by an alternating magnetic flux in a direction perpendicular to the plane of the lamination. It is also shown that the eddy current loss occurring in the common magnetic circuit when the latter is radially excited is closely related to the magnetization process due to domain wall displacement.