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The use of a magnetic field in the assessment of the operating loads of pneumatic tires

Warczek Jan, Brol Sebastian, Kozuba Jarosław

Transport Problems

2023

T. 18, z. 2

53--62

Steel is a typical construction material with ferromagnetic properties. This material is often used as a structural component of composites whose task is to transfer mechanical loads. This function is performed by the steel wires placed inside the tires. The aim of the preliminary tests was to determine the influence of air pressure changes in the pneumatic wheel on the distribution of the magnetic field observed outside the tire. The research used a magnetostrictive sensor that reacts to changes in magnetic induction. A sensor with three perpendicular measurement directions was used, and the components of the magnetic induction vector were measured at selected measurement points located in the space surrounding the tested tire. During the tests, measurements were made of the tire’s magnetic field under various load conditions. The results confirmed the occurrence of measurable effects of changes in the magnetic field distribution of the tire depending on the pressure inside.

Silnik tarczowy do pojazdów elektrycznych - charakterystyka pola magnetycznego

Sulima R., Rudeński A.

Prace Instytutu Elektrotechniki

2012

Z. 258

41-58

Artykuł opisuje konstrukcję, wykonane obliczenia oraz pomiary indukcji magnetycznej w bezrdzeniowym silniku tarczowym z magnesami trwałymi. Pomiary wykonano w stanie bezprądowym w dwu przypadkach: 1) przy rozmontowanym wirniku, t.j. na powierzchni magnesów przytwierdzonych do pojedynczej tarczy jarzmowej i 2) ze zmontowanym wirnikiem - pomiary w środku szczeliny powietrznej pomiędzy tarczami jarzmowymi z zamocowanymi magnesami. Wykonano obliczenia polowe 3D przedmiotowego silnika dla obu powyższych wariantów: z pojedynczą tarczą wirnika oraz ze zmontowanymi dwoma tarczami wirnika. Przeanalizowano i porównano wyniki pomiarów oraz obliczeń polowych silnika i stwierdzono znaczną zgodność uzyskanych wyników.

A coreless disc motor with permanent magnets, made in IEL was investigated with respect to the distribution and leakage of its magnetic field. Computations of the 3D field were made for verification. Neodymium magnets with remanence induction of Br = 1,3093 T were used to build the motor. The measurements were made using an FM 210 teslometer with a Hall probe, calibrated with an 1 T etalon. The investigations were performed using an open magnetic circuit (both discs mounted without armature). In the first case the measurements were made at the surface of magnets according to the net shown in Figure 3. The results are presented in Table 1 and Figure 4. Measurements with closed magnetic circuit were made at half width of the air gap at 9 points Table 3). The magnet was divided into 16 measuring fields, symmetrically with respect to axes x and y. The measurements were made at the edges of the middle 9 fields. Results of measurements and 3D computations are very close.