• 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
  

This bulletin is designed to be helpful in the selection and ordering of cut cores for the production of compact and lightweight power and pulse transformers of a given VA rating.

Cut cores manufactured using Microsil take advantage of the excellent magnetic properties exhibited in the rolling direction of grain oriented silicon steel. Regular grain oriented silicon steel cores can, therefore, be used at flux densities through 18.0 Kilogauss. Superoriented, 9 mil thick, "Z" grade can be used up to 18.5 Kilogauss.

Supermendur has the highest flux density (21.0 kilogauss) of all the materials. Applications are wherever size and weight are a major design consideration.

In addition to data on Microsil cut cores, this bulletin has been expanded to include design data on Superperm 49 (50% Nickel) and Superperm 80 (80% Nickel). These cut cores have lower losses than silicon iron cores. See Figures 12 through 19.

The types of cores available are:
"C" - Single phase cut core
"E" - Three phase cut core

Regular Microsil cores are produced in 1, 2, 4, 7, and 12 mil thicknesses. Superoriented Microsil "Z" grades are produced in 4, 7, and 9 mil thicknesses only. Supermendur cores are produced in 4 mil thickness. Nickel iron (Superperm 49 and 80) cores are produced in 1, 2, 4, and 6 mil thicknesses.

Magnetic Metals Corporation has been a pioneer of magnetic components since the Company's founding over fifty years ago. The success of the Magnetic Metals Corporation is based on team involvment with our customers' engineers in all aspects of magnetic circuit applications, from initial design concepts through material selection, fabrication, and metallurgical processing. Our engineers are available to assist you with your designs to insure improved efficiency, and reduced size and costs.

CUT CORE BENEFITS

Cut cores are ideal for transformer design engineers who require one to several thousand transformers in shapes which are unavailable in standard lamination sizes. Cut Cores are ideally suited where weight or dimensional requirements are critical.

Cut Cores also offer the following:

• Availability in a wide range of geometric shapes to meet your design requirements at minimum costs
• Low assembly costs
• Full magnetic utilization of grain oriented silicon iron in the rolling direction
• Lighter weight for same VA power rating
• Flux densities through 21.0 kilogauss
• Air gap can be easily adjusted for specific choke design
• High pulse permeability with or without reset
• Operating frequency up to 40 kilohertz with thin gauge core material

MAGNETIC METALS CORPORATION MAKES BETTER CUT CORES

• In a wide selection of the following materials: Microsil (silicon steels) - 1, 2, 4, 7, 9, and 12 Mil. (available in selected high flux material, coded "Z") Square 50 (50% nickel iron) - 1, 2, 4, and 6 Mil. Superperm 80 (80% nickel iron) - 1, 2, 4, and 6 Mil.
• In the following core shapes:
  • Single phase cut core
  • Three phase cut core
• Capable of operating at temperatures up to 350 F.
• Outstanding pulse performance
• Reduced core noise available
• Easy selection
• Wide range of cores available from stock for quick delivery
• High quality assurance of finished parts from proven designs and advanced manufacturing facility.
• Special sizes or shapes are readily manufactured to meet your prototype or standard designs.

ELECTRICAL CHARACTERISTICS

Magnetic Metals cut core manufacturing processes are designed to produce cores having the lowest possible losses and magnetizing currents. Where required, special selection of steel is made to meet exacting specifications for very low loss, high pulse permeability, etc. Through improved cutting procedures and butt end preparation, the air gap at the face is kept to an absolute minimum. As a result, the assembled cores exhibit exceptionally low hum and low exciting current.

Data for the cut core materials are given in Figures 2 to 15; they represent typical values for the material normally used. For special applications consult Magnetic Metals.

TEMPERATURE CHARACTERISTICS

Magnetic Metals' Microsil cut cores are designed to perform up to 350° F operating temperature.

PULSE PERMEABILITY

Magnetic Metals' special material selections and unique manufacturing techniques result in outstanding pulse core performance. Typical data is shown in Figure 1. To order cut cores for pulse applications add suffix "P" to the part number.

LOW NOISE CORES

Audible noise suppression has become important in some applications. A process has been developed which will reduce core noise. To order cores for low noise applications add suffix "LN" to the part number.