Silicon Steel AC Testing System|SeeweTek | Magnetic Field Generators, Magnetic Testing Solutions, Physical Property Testing Solutions

Magnet

Magnetic Material Measurement

Magnetic Field Generation and Shielding System +

Superconducting and Cryogenic Systems

Physical Property Measurement System +

Comprehensive Test System +

Test Fixtures and Accessories +

High Precision Power Supply +

Sensor

Expand

Silicon Steel AC Testing System

Description：The Silicon Steel AC Testing System automatically measures AC magnetic parameters of soft magnetic materials such as FeSiAl, FeSi, soft ferrite, permalloy, amorphous/nanocrystalline, and silicon steel under continuous frequencies from 40 Hz to 300 kHz. Measured parameters include Ps, Bm, Hm, Ss, μa, δ, Br, and Hc. Dynamic magnetic parameters such as μ′, μ″, μL, μR, Q, and AL can be derived under specific conditions. The system consists of a computer, TPS series broadband programmable test power supply, and LZ series power analyzer, equipped with dedicated measurement software for complex magnetic testing and data management.

Category：

Magnetic Material Measurement

Detail

Parameter

Other

The Silicon Steel AC Testing System automatically measures AC magnetic parameters of soft magnetic materials such as FeSiAl, FeSi, soft ferrite, permalloy, amorphous/nanocrystalline, and silicon steel under continuous frequencies from 40 Hz to 300 kHz. Measured parameters include Ps, Bm, Hm, Ss, μa, δ, Br, and Hc. Dynamic magnetic parameters such as μ′, μ″, μL, μR, Q, and AL can be derived under specific conditions. The system consists of a computer, TPS series broadband programmable test power supply, and LZ series power analyzer, equipped with dedicated measurement software for complex magnetic testing and data management.

Applicable Standards

GB/T 3655-2022 “Methods of measurement of the magnetic properties of electrical steel strip and sheet by means of an Epstein frame”
GB/T 10129-2019 “Methods of measurement of the magnetic properties of electrical steel strip and sheet at medium frequencies”
GB/T 3658-2022 “Methods of measurement of magnetic properties of soft metallic and powder materials at frequencies in the range 20 Hz to 100 kHz by the use of ring specimens”
GB/T 19346.1-2017 “Methods of measurement of amorphous and nanocrystalline alloys - Part 1: AC magnetic properties by the use of ring specimens”
SJ 20966-2006 “Methods of measurement of soft ferrite materials”
IEC 60404-2 “Magnetic materials - Part 2: Methods of measurement of the magnetic properties of electrical steel strip and sheet by means of an Epstein frame”
IEC 60404-6:2008 “Magnetic materials - Part 6: Methods of measurement of the magnetic properties of magnetically soft metallic and powder materials at frequencies in the range 20 Hz to 200 kHz by the use of ring specimens”

Product Features

Computer-controlled digital power supply and standard power meter ensure fully automated testing.
The digital programmable power supply features automatic range switching, adapting output and sampling ranges based on material characteristics, enhancing safety and measurement accuracy.
Test samples have a closed magnetic circuit structure; windings are directly applied on the sample. The sample, magnetizing coil (N1), and measuring coil (N2) together form a no-load transformer.
The magnetizing coil circuit is connected in series with the current terminal of the standard power meter; the peak magnetic field is obtained by reading the current peak value of the power meter.
The measuring coil is connected to the voltage input of the standard power meter; the peak magnetic flux density is calculated from the RMS voltage reading.

Test Items

Closed-Circuit Samples: The sample, magnetizing coil (N1), and measuring coil (N2) together form a no-load transformer. Suitable for ring, rectangular, CD, EE, UU, PQ, and other closed magnetic circuit structures.

Epstein Frame: The Epstein frame is a magnetizing device for measuring magnetic properties of electrical steel strips. It consists of four coils and an air flux compensation coil. Each of the four coils includes a primary magnetizing winding and a secondary sensing winding. During testing, the primary coil, secondary coil, and the electrical steel strip sample as the core form a no-load transformer.

Single Sheet Tester: For single sheet silicon steel/electrical steel samples.

*Note: SeeweTek can provide customized Epstein frames, single sheet testers, and compliant test fixtures.

Equipment Parameters:

Operating Environment
Input Power	Single-phase 220V, 50Hz
Operating Environment	Ambient Temperature: 23±5°C; Ambient Humidity: 30～75% RH
External Magnetic Field Interference	Must be strictly avoided
Thermal Equilibrium Time	10 minutes
Silicon Steel Measurement Device
Max Output Power	500VA
Frequency Range	40Hz-1kHz
Frequency Resolution	< 0.1% of reading, frequency error < 0.05%
Output Voltage	0～1V～10V～50V～150V, four auto ranges
Max Output Current	10A
Lock Bm	√
Lock Hm	√
Broadband Programmable Test Power Supply
Sub-model	A	B	C
Max Output Power	500VA (≤120k)
Frequency Range	1kHz～120kHz	1kHz～200kHz	1kHz～300kHz
Frequency Resolution	< 0.1% of reading, frequency error < 0.05%
Output Voltage	0～10V～50V～150V～300V, four auto ranges
Max Output Current	10A	10A	10A
Lock Bm	√	√	√
Lock Hm	√	√	√
1. √ indicates support, Х indicates not supported. 2. Model definition: Max output power (VA), suffix indicates max frequency (kHz)/10 + max output current (A) + letter (A: supports lock B; B: supports lock B and lock H).

Power Analyzer
Frequency Measurement	40Hz～300kHz
Current Measurement	0～12A (RMS)
Voltage Measurement	0～300V (RMS)
Phase Accuracy	1% ±0.05°

Measurement Parameters:

According to GB/T 3655-2022, at 50Hz and 60Hz, using a 25cm Epstein frame to measure 30mm×300mm silicon steel samples.
Parameter	Ps(%)	Hrms(%)	Bm(%)	Hm(%)
Uncertainty (k=2)	1	2	1	2
Repeatability (constant temp)	± 0.5	± 1	± 0.5	± 1

According to GB/T 3658-2022, at 20Hz～100kHz, measuring permalloy ring samples.
Parameter	Ps(%)	μa(%)	δ(%)	Bm(%)	Hm(%)
Uncertainty (k=2)	3	2	——	1	1
Repeatability (constant temp)	± 1.5	± 1	± 1	± 0.5	± 0.5

According to GB/T 19346.1-2017, measuring amorphous ring samples.
Parameter	Ps(%)	μa(%)	Ss(%)	Bm(%)	Hm(%)
Uncertainty (k=2)	3	3	3	1	1
Repeatability (constant temp)	± 1.5	± 1.5	± 1.5	± 0.5	± 0.5

According to military standard SJ 20966-2006, measuring ferrite ring samples, specifications as follows:
Parameter	Ps(%)	Hrms(%)	Bm(%)	Hm(%)	Ps(%)
Uncertainty (k=2)	5	3	1	1	5
Repeatability (constant temp)	± 3	± 2	± 0.5	± 0.5	± 3

Testing metal powder core ring samples at 100kHz, specifications as follows:
Parameter	Uncertainty (k=2)				Repeatability (constant temp)
Loss Angle Range	0.5°	1°	1.5°	≥3°	0.5°	1°	1.5°	≥3°
Ps	25%	15%	10%	3%	±10%	±5%	±3.5%	±1.5%
ua	3%	3%	3%	3%	±1.5%	±1.5%	±1.5%	±1.5%
Bm	1%	1%	1%	1%	±0.5%	±0.5%	±0.5%	±0.5%
Hm	1%	1%	1%	1%	±0.5%	±0.5%	±0.5%	±0.5%
Ss	3%	3%	3%	3%	±1.5%	±1.5%	±1.5%	±1.5%
δ	20%	12%	8%	3%	±0.05°	±0.05°	±0.05°	±0.05°