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Electromagnetic properties (b-h curves) and electrical resistivity were the main properties investigated in the project work.
Magnetic field lines of a magnet a force that pulls on other ferromagnetic materials, such as iron, and attracts or repels other magnets. Delivery times may vary, especially during peak periods and will depend on when your payment clears - opens in a new window or tab. If the item comes direct from a manufacturer, it may be delivered in non-retail packaging, such as a plain or unprinted box or plastic bag.
Find out more about your rights as a buyer - opens in a new window or tab and exceptions - opens in a new window or tab. Contact the seller- opens in a new window or tab and request a postage method to your location. We can design many magnetism clamps, supply magnetism system designing, subject designing and consultation of magnetism materials.


As the sample, rings made of steel used for structural pieces in large AC machine have been chosen. If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable. Company’s professional knowledge can offer the best help and service to the backward customers.
The custom magnetic materials, magnet materials products are used for electrical machine, mechanisms, mould, machining, etc industry field and many mechanisms. The stator and rotor are commonly built with specificgrades of laminated electrical steel. Proper dimensioning of the machine requires precise estimation of the B-H curves of the laminations and also the iron loss it undergoes during var- ious states of operation. The grades de- scribe material characteristics and losses at two operating points at least (f=50, 60 Hz and B=1, 1.5 T). These loss charac- teristics may not be sufficient for machines with variable speed drives or with different types of excitation supply.
Beside lamina- tion sheets, structural metallic parts are used in the machine for several purposes. Some of these parts are also subjected to flux density variations if they happen to be placed in leakage flux paths. Due to lack of material characterization, these losses are usually not accounted in the simulation models. To include the structural materials in loss calculation model, they require characterization.This paper aims to describe the activities conducted to meas- ure the magnetic characteristics and loss figures under sinus- oidal excitation of a specific part of the electric machine, espe- cially manufactured rings made of steel used for structural parts.
Electrical characterization has been done to measure the resistivity values of the samples. The results [1] described in this paper are based upon experiments performed in the elec- tromagnetic engineering lab and electrical machines lab of Royal Institute of technology a€“ KTH, Stockholm, Sweden.a€”a€”a€”a€”a€”a€”a€”a€”a€”a€”a€”a€”a€”a€”a€”a€”1.
In simple terms, magnetic characterization can be explained as an experimental procedure in which the specimens made of the investigated material are subjected to wide range of polarization levels at different frequencies.


A commonly used instrumental setup facilitating the measurements is a hysteresisgraph or BH meter [3]. Test specimens defining closed magnetic loop are equipped with an excitation winding and a measurement winding. The value of applied magnetic field H is directly proportional to the current according to line integral form of Amperea€™s law.Important properties of the soft magnetic material are ob- tained in points be, cf , a and d shown in figure 2. But magnetic materials are non linear due to inherent hysteresis characteristics of the material.
For traditional measurements analog feedback is sufficientThe applied magnetic field in the excitation coil gives rise tovoltage across the measurement winding.
The induced voltageis integrated over time to obtain the induced flux density (B)using a fluxmeter.??‘‰??‘Y??‘s??‘  = a?s2???‹???‹??‘?2 ???????µ??‘s??‘Z??‘? (2)WhereThe computer interface allows conducting controlled magnetic measurements. To obtain initial b-h characteristics curve, the sample needs to be demagnetized in a decreasing alternating field to begin with. Problem arises when measurements are taken over wide range of polarization levels at high frequencies.
Sinusoidal flux density is obtained by iterative modification of the magnetiz- ing current.
The wires were then covered with aluminum foils to further re- duce introduction of surrounding noise. In this section, a number of experiments have been performed to measure the electrical resistivity of the ring samples.Electrical resistivity is an important physical property for any material to be used in electrical machines.
Moses, a€?Use of novel adap- tive digital feedback for magnetic measurements under controlled magnetizing conditionsa€?, IEEE Trans.
Soulard, a€?Overview and comparison of iron loss models for electrical machinesa€?, Journal of Electrical Engineering, vol.




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