• Cut Core Benefits
• Material Selection Guide:
  Table I
• Design Guide
• Cut Core Manufacturing
• Ordering Information
• Standard Part Number Drawing
• How to Make Cut Core Selections
• Material Standard Strip Width:
  Table II
• Material Codes and Test Points:
  Table III
• Typical Loss Curves at Various Frequencies
• Microsil
• Superperm 49
• Superperm 80
• Hanna Design Curves
• Hanna Curve Calculations
• EIA Standard RS 217A
• How to Measure
• Mechanical Tolerances for Single Phase "C" Cores
• Mechanical Tolerances for Three Phase "E" Cores
• Assembly Instructions
• Cut Core Data Sheet and Quote Request Form
  

The information contained in the catalog is a comprehensive listing of Magnetic Metals' cut cores. Core sizes not listed can be fabricated upon request.

SELECTION OF CORES

1. Selection by Catalog Number. In the first section of the catalog, cores are listed with increasing part number for each material and thickness.

2. Selection by Size. In the second section, cores are listed with increasing dimensions. Sorting is done by the window dimensions "F" and "G" first and then by the cross section area dimensions "D" and "E" for each material and grade.

For each core, the dimensions, leg area, DEFG product, the weight and the maximum power handling capacity at the stated flux level, frequency and current density are given.

An example of the way in which the catalog may be used is given below.

TRANSFORMER REQUIREMENTS

Given:           60 Hz
(12 mil microsil selected as the gauge and material)
Primary Voltage:        120 V
Secondary Voltage:       12V
The Power Handling Capacity:     48
DEFG Product = VA x 10⁸ / 4.55 x sBF
DEFG Product = 48 x 10⁸ / 4.55 x 1500 x 18000 x 60
DEFG Product = .651

Referring to the catalog listing any cores which have a power handling capacity of 48 VA or higher and the DEFG product >.65 would be suitable for this application. For example MA314B has a VA = 49.45 and a DEFG product of .671 or MA334A has a VA = 49.02 and a DEFG product of .665. Both cores have sufficient power handling capacity to meet the above requirement. The selection now all depends on the mechanical requirements of the design.

If the listing does not show cores that fit the required geometry, then the designer can choose other dimensions DEFG resulting in a product close to the value calculated. It is of utmost importance to select the D dimension from the preferred strip widths given in Table II. This table should be consulted whenever possible in designing cut cores of dimensions not listed. For strip widths other than those listed consult factory for availability.