Our magnetic Characteristics Measurement System is a fully automatic measurement device for measuring the magnetization characteristics of magnets. Our magnetic Characteristics Measurement System is a fully automatic measurement device for measuring the magnetization characteristics of magnets. Residual flux density, coercivity, maximum energy product, etc. can be measured. While direct current has been used, we have developed a pulsed magnetization type BH curve tracer in response to the need for enhanced performance from magnetic materials.
Main measurement items:Maximum energy product (BH MAX), residual flux density (Br), coercive force (HcB, HcJ), saturation magnetization (Js), maximum saturation flux density (Bs), others (Br/Bs, Hk, Hk/HcJ)
Compact, easy operation and high cost performance
Direct Current Type 6700BH
6700BH
Pole coil method has limited constraints on the shape of the object to be measured
Conventional jacket (search) coil type can be used
PC interface for filing measurement conditions and data
Measurement data can be converted to CSV for use in Excel and other application software.
Pulse magnetization method.
High coercivity magnets can be measured with high accuracy and in a short time.
Pulse type PBH-1000
PBH-1000
Capable of generating high magnetic fields
: up to 12 T (using special air-core coils) fully saturated with high magnetic fields
Magnetic field strength specifications can be selected to match the magnet being measured
: Ferrite magnets and rare earth sintered magnets are available.
High speed measurement: 1 measurement per minute
High performance: Repeatability ±1% or less
Can be designed and manufactured according to sample dimensions
: Standard sample dimensions φ10 L=7
Basic operation is as easy as 6700BH
Variable temperature measurement model added to lineup
: temperature can be set up to 200°C
*PBH-1000 is manufactured in accordance with EMAS-7007 “Permanent Magnetic Field Measurement Method Using Pulse Magnetic Field” prepared by the Magnet Technology Committee of the Japan Electronics and Information Technology Industries Association.
PBH-1000
Automatic measurement of magnetization characteristics of high coercivity magnets using superconducting coils
Superconducting coil type SBH-1000
Superconducting coil type SBH-1000
Superconducting coil type SBH-1000
Capable of measuring a large-size magnet φ30
Excitation field: 6 (T) max.
Temperature test : 200 (°C) max.
Advantages over other methods
1. Electromagnetic saturation
Since abnormal attenuation may occur above about 1.2[T] (957.2[kA/m]) due to the magnetic saturation of the iron used in electromagnets, it is not suitable for the measurement of high-coercivity magnets such as NdFeB sintered.
2. Pulse Magnetic Field – Magnetic aftereffect
In the method using pulse magnetic field, a discontinuity appears in the B-H demagnetization curve for permanent magnets with a large magnetic aftereffect. This phenomenon is remarkable for NdFeB with HcJ less than 400 kA/m and SmCo-based sintered permanent magnet.
3. Large magnet – Eddy currents
In the method using pulse magnetic field, eddy currents are generated in magnets with high conductivity such as NdFeB magnets. Therefore, due to the skin effect, the magnetic flux is concentrated on the surface and does not penetrate into the interior of the magnets. Therefore, it is difficult to accurately measure large, highly conductive magnets.
Comparison of BH equipment
Static magnetic field Pulse Superconducting
Main specification
Measurements are made by placing a magnet between electromagnets.
Measure using a pole coil or jacket coil
Measuring range: about 2.5T
Measurements are made using a pulsed power supply and an air-core coil.
Jacket coil type
Measuring range up to about 15T
Measurements are made using a superconducting magnet.
Jacket coil type
Usually measures at around 5T. In Japan, 45T superconducting coils also exist.
Correction of anti-magnetic field Not required Necessary Necessary
Abnormal demagnetization yes no no
NS switching no yes yes
Eddy current no yes no
Measurement time 2 to 5 minuites 1 to 3 minutes 5 to 15 minutes
Shape restriction Pole coil method has few restrictions on the shape of the object to be measured yes yes
Disadvantages Unable to measure high magnetic fields Eddy currents are generated
Correction of anti-magnetic field is required Correction of anti-magnetic field is required
High-sensitivity, high-precision measurement with simple operation
Vibration Magnetometer VSM-1000
VSM-1000
Vibration of the sample at a constant amplitude and frequency enables small-sample, high-sensitivity measurements.
No error due to integral drift and high accuracy measurement
Simple sample setting system with rods that can be pulled out of the electromagnet
Same condition setting skip function for high volume and lot measurement is supported. Automatically saves not only individual measurement data, but also characteristic value comparisons, waveform comparison images, etc.
Specification
Model DC type 6700BH Pulse type PBH-1000
Power input AC100±10V 50/60Hz 30A Single phase AC200±20V 50/60Hz 60A
Maximum Applied Magnetic Field 1.59MA/m（20kOe） at Gap 7mm 9.57MA/m（120kOe）
Magnetic field sweep speed*1 795kA/m/sec（1kOe/sec） 1.196MA/m/sec（15MOe/sec）
Triangular wave Variable speed Pulse zero to maximum 8m sec
Excitation power supply 20A DC, 60V Pulse 10kA (2500V, 1500μF)
Measurement time*1 Approx. 1 min. or more Variable Approx. 1-3 minutes
Magnet shape*2 Cylinder Diameter, height: approx. 5 to 30 mm each Diameter 3 to 10mm, Height 3 to 20mm approx.
Prism Width, depth, and height: approx. 5 to 3 mm each Width, depth: 3 to 10 mm each, height: 3 to 20 mm approx.
Repeatability*3 J: ±1%, H: 1%
Temperature application no From room temperature to 200°C
Main measurement items Residual flux density: Br, Saturation magnetic polarization: Js, Coercive force: HcB, HcJ, Maximum energy product: BHmax, Orientation: Br/Js, Angular ratio: Hk/HcJ
External dimensions (mm) W750×D750×H1500 W1000×D1650×H1650
Mass (kg) Approx. 600 Approx. 1200
Model Superconducting coil type SBH-1000 Vibration Magnetometer VSM-1000
Power input Three-phase AC200±20V 50/60Hz 80A Three-phase AC200±20V 50/60Hz 30A
Maximum Applied Magnetic Field 4.78MA/m（60kOe） 1.59MA/m（20kOe）
Magnetic field sweep speed*1 159kA/m/sec（2kOe/sec） 795kA/m/sec（1kOe/sec）
Triangular wave Triangular wave Variable speed
Excitation power supply DC 270A,30V DC50A,100V
Measurement time*1 Approx. 8 min. Approx. 1 min. or more. Variable
Magnet shape*2 Cylinder Diameter, height: approx.2 to 30 mm each Diameter, height: approx. 1 to 4 mm each
Prism Width, depth, height: approx. 2 to 30 mm each Width, depth, and height: approx.1 to 4 mm each
Repeatability*3 J: ±1%, H: 1%
Temperature application From room temperature to 200°C no
Main measurement items Residual flux density: Br, Saturation magnetic polarization: Js, Coercive force: HcB, HcJ, Maximum energy product: BHmax,, Orientation: Br/Js, Angular ratio: Hk/HcJ
External dimensions (mm) W600×D1000×H2000 W1000×D800×H1500
Mass (kg) Approx. 1100 Approx. 900
*1 When all quadrants are measured and maximum magnetic field is set.
*2 Standard shape: Diameter 10mm, height 7mm, cylindrical
*3 Calculated using Br and HcJ for the same sample and under the same measurement conditions. Varies depending on sample method and characteristics.
Comparison of the method of measuring the magnetic properties of permanent magnet
Superconducting BH VSM Flux meter Tesla meter
Measurement result BH Curve BH Curve Total magnetic flux Surface magnetic flux density distribution
Sample size approx. 7 mm to 30 mm cube Several mm square thin film any product shape any product shape
Characteristics Possible to measure high coercive force material
Less influence of eddy currents Capable of micro-magnet measurement Measurement of quality control standards for product magnetic flux Measurement of motor assembly quality control standards
BH Analysis Items
Saturation magnetization Js ◯ ✕ – –
Anisotropic magnetic field Hr ◯ ✕
Magnetization ratio ◯ ✕
Curie point Tc ✕ ◯
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