What are the adverse effects when the iron core is magnetically saturated?
Iron core is an important component of the magnetic circuit of the motor product, the main material of the core is silicon steel sheet, different performance of the motor, may require different grades and thickness of silicon steel sheet to meet the final magnetic performance requirements. In physics, the strength of the magnetic field using the magnetic induction strength to indicate that the greater the magnetic induction strength, that is, the stronger the magnetic induction properties. The smaller the magnetic induction strength, the weaker the magnetic induction capability.
Silicon steel sheet, a very typical soft magnetic material, is used to increase the magnetic flux of the inductor coil for maximum conversion of electromagnetic power. Motor winding will generate electromagnetic field after energized, the magnetic field through the iron core, it will be the original disorder of the core of the small magnetic needle order management, these regular rows of small magnetic needles, to further enhance the strength of the electromagnetic field, that is, the motor winding generated by the magnetic field through the iron core when the loss is small, to better achieve the conversion of energy, we can also understand the iron core for the electromagnetic field of the green channel.
Different types and grades of permeable materials, with different permeability, this ability is reflected in the magnetic flux density, that is, in the range of magnetic flux density, permeable materials can achieve a better permeability function, but when the required through the magnetic flux is larger, that is, attempting to pass through the magnetic flux density is higher than the density of permeable materials, even if the motor’s current is increased, there will not be a simultaneous enhancement of the magnetic field strength, at this time, we can That the iron core of the motor, reached the upper limit of magnetic flux, that is, in a saturated state, can also be visualized as a “traffic jam” state.
In the motor design link. More close to the magnetic saturation is set as an ideal state, that is, to ensure better utilization of materials, the state, but also does not allow the motor voltage has too much positive offset, in order to prevent because of the voltage increases lead to other problems, in many of the technical conditions, to 10% of the provisions of the voltage offset limit value. Magnetic saturation of the iron core will cause the motor to overheat, leading to insulation deterioration, and in severe cases will cause coil turn-to-turn short circuits and motor burnout!
