Introduction to the IMA Working Group
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1 Introduction to the IMA Working Group
2 About the IMA Global trade group made up of companies involved in the soft magnetics industry. Includes manufacturers and distributors. Organized as a working group within The Transformer Association (TTA). Was formerly known as the MMPA (Magnetic Materials Producers Association).
3 Mission The mission of the IMA is to promote the worldwide growth, development, understanding and use of magnetic materials and devices
4 Industry Standards The IMA develops, maintains and distributes industry standards. The IMA is currently in the review process of updating and revising the soft ferrite standards Current available standards: Soft Ferrite Cores User Guide Standard Spec for Ferrite Pot Style Cores Standard Spec for Ferrite Toroid Cores Standard Spec for Ferrite U E I Cores Standard Specification for Ferrite Threaded Cores
5 Education The IMA presents seminars and workshops in conjunction with major trade shows.
6 Statistics The members of the IMA gather market information and benchmark activity in order to better understand business and technology events that impact the industry.
7 Meetings The IMA meets regularly through the year and at TTA meetings.
8 Members List Distributors Allstar Magnetics, LLC Amidon, Inc Dexter Magnetics Technologies Elna Magnetics Kreger Components, Inc MTL Distribution Manufacturers EPCOS Inc. Fair-Rite Products Corp. Ferroxcube USA Magnetics Micrometals Inc. National Magnetics Group, Inc. TSC Ferrite International VAC Sales USA, LLC
9 Current Initiatives Core Loss Testing Working group initiated a round robin testing of wound cores to determine industry consistency in Inductance measurements (µh ) Core Loss ( W/cm 3 ) No specifications were given for equipment or test method
10 Testing Experiment Take two similar inductor designs and have each manufacturer test for inductance and core loss, indicating conditions. Each manufacturer tests the same inductors and used their internal core loss setup. Six manufacturers agreed to test
11 Testing Criteria Coils Used (wound by A) Toroid 1 Designation T21/13/ Part Number Turns Toroid 2 Designation T32/19/ Part Number Turns
12 Inductance Testing Equipment Used (Inductance Test) HP 4284A, T.F E Voltech 3600 Industry standard inductance test is at 10 khz 10 Gauss
13 Inductance Testing Inductance Test Results (coil 1) A B C D E F Test Voltage *** 5.5 mv 5.5 mv 5.5 mv 5.5 mv 5.4 mv 6mV Test Frequency 10 khz 10 khz 10 khz 10 khz 10 khz 10kHz sample# sample# sample# sample# sample# sample# sample# sample# sample# sample#
14 Inductance Testing Inductance Test Results (coil 1) A B C D E F Test Voltage *** 55 mv 55 mv 55 mv 55 mv 53.9 mv 55 mv Test Frequency 100 khz 100 khz 100 khz 100 khz 100 khz 10kHz sample# sample# sample# sample# sample# sample# sample# sample# sample# sample#
15 InductanceTesting Inductance Test Results (coil 2) Test Voltage *** A 13.5 mv B 13.5 mv C 13.5 mv D 13.5 mv E 13.1 mv F 13 mv Test Frequency 10 khz 10 khz 10 khz 10 khz 10 khz 10kHz sample# sample# sample# sample# sample# sample# sample# sample# sample# sample#
16 InductanceTesting Inductance Test Results (coil 2) Test Voltage *** Test Frequency A 135 mv 100 B 135 mv 100 C 135 mv 100 D E 131 mv 100 khz F 135 mv 100 khz 135 mv 100 khz khz khz khz sample# sample# sample# sample# sample# sample# sample# sample# sample# sample#
17 Core Loss Testing Equipment Used (Core Loss Test) CH258, ENI 2100L, HP3324A CH 2335 KH7500 CH258 Tektronix CFG253 & TDS 200; Kron-Hite 7500 Amplifier; Clarke-Hess V-A-W Meter Model 258 Tektronix TDS 3032B; Agilent 33120, Amplifier 75A 250M4 HP4284A + Tektronix TDS 5032B + Agient 33120A + TC Power Conversion AG1018
18 Core Loss Testing Core Loss Test Results (coil 1) A B C D E F Test Voltage *** 10.8 V 10.8 V 10.8 V 10.8 V 10.8 V 100mT Test Frequency 100 khz 100 khz 100 khz 100 khz 100 khz 100kHz sample# sample# sample# sample# sample# sample# sample# sample# sample# sample#
19 Core Loss Testing Core Loss Test Results (coil 2) A B C D E Test Voltage *** V Test Frequency khz khz khz sample# sample# sample# sample# sample# sample# sample# sample# sample# sample# F
20 Core Loss Testing Core Loss Test Results (coil 2) A B C D E Test Voltage *** 10.8 V 10.8 V 10.8 V 10.8 V Test Frequency khz khz khz khz sample# sample# sample# sample# sample# sample# sample# sample# sample# sample# F
21 InductanceTesting Conclusions Inductance Testing Similar equipment used by all manufacturers Similar test methodology used by all manufacturers Results consistent within each manufacturer 4 of 6 manufacturers consistent with each other
22 Core Loss Testing Conclusions Core Loss Testing Different equipment used by all manufacturers Method of test not revealed by manufacturers Results consistent within each manufacturer Manufacturers inconsistent with each other Frequency, gauss level and heating contributed to inconsistent results.
23 Core Loss Testing Next Steps Test larger and smaller test inductors Test shapes other than toroids Determine inconsistencies between manufacturers
24 Future Testing Groundwork has been laid for working with the PSMA for testing criteria at higher frequencies
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