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Core/Shell Composite Soft Magnetic Material for Advanced Motors (REVISED)

Award Information

Department of Energy
Award ID:
Program Year/Program:
2007 / SBIR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
Technology Assessment & Transfer, Inc.
133 Defense Highway, Suite 212 Annapolis, MD 21401-
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Woman-Owned: Yes
Minority-Owned: No
HUBZone-Owned: No
Phase 1
Fiscal Year: 2007
Title: Core/Shell Composite Soft Magnetic Material for Advanced Motors (REVISED)
Agency: DOE
Contract: DE-FG02-07ER84787
Award Amount: $99,986.00


For hybrid electric vehicle (HEV) applications, the Department of Energy (DOE) is directing an aggressive program to achieve rapid progress in permanent magnet (PM) machine development. To achieve DOE goals, PM motors must operate at twice the frequency of current electric motors used in hybrid-electric vehicles. Achieving these goals will require rotor and stator core materials with high electrical resistivity to reduce eddy currents and decrease total core losses during high frequency operation. This project will reduce core losses by using a powder metallurgy approach to create soft magnetic, high-resistivity, rotor and stator core materials. In particular, soft magnetic alloy powders will be coated with a nanolayer of a high resistivity, ferrimagnetic ferrite. The powders will be used to create dense composite parts with low porosity. This approach will isolate the electrically-conductive ferromagnetic regions with a shell of high resistivity ferrimagnetic material, thereby reducing eddy current losses while maintaining magnetic exchange coupling between metallic ferromagnetic regions. This exchange coupling is necessary to achieve high permeability materials with low hysteretic losses. Commercial Applications and other Benefits as described by the awardee: In addition to vehicle applications, improved permanent magnets should have application to distribution and power transformers, high reactance cores, communications equipment, high-efficiency fractional horsepower motors, large generators, pole pieces, and relays.

Principal Investigator:

Todd M. Heil

Business Contact:

Sharon Fehrenbacher
Small Business Information at Submission:

Technology Assessment & Transfer, Inc.
133 Defense Highway Suite 212 Annapolis, MD 21401

EIN/Tax ID: 521253097
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No