Electric Motor Magnetic Saturation

A motor makes torque from the product of it magnetic field strength and electric current.

Electric motor magnetic saturation.

To avoid the undesirable effect of the magnetic saturation the size of the iron core suitably chose for a particular engineering application. If so imho the motor efficiency would drop like a rock. An increase of field in the neighbor hood of 10 will cause the core to go into saturation. Danish scientist hans christian ørsted discovered in 1820 that electric currents create magnetic fields.

The saturation magnetic density is lower due to the silicon content of the conventional motor core made of non grain oriented ngo silicon steel. It continues to increase very slowly with the field due to the vacuum permeability saturation is a characteristic of ferromagnetic and ferrimagnetic. If the frequency related to the rate of change of flux drops the magnetic field must increase to maintain a fixed voltage. Qualities with a cobalt content of 49 and 2 vanadium are offering in addition low coercivity forces and therefore best possible parameters for highest performance electric.

Thanks to their high magnetic saturation of up to 2 4 t the cobalt iron cofe alloys vacoflux and vacodur are generally suitable for all applications where high flux density and minimum weight are required. An analytical method for the calculation of the effect of magnetic saturation on the leakage reactance of three phase induction motors is developed and confirmed by experiment. Seen in some magnetic materials saturation is the state reached when an increase in applied external magnetic field h cannot increase the magnetization of the material further so the total magnetic flux density b more or less levels off. This prevents magnetic saturation at which a motor s rotor cannot be magnetized further causing high currents.

Voltage to be applied is calculated from the applied frequency required to. Generally volume of the iron or steel core of magnetic path in a machine is so chosen that flux density of the core does not cross the limit of 1 5 tesla in normal operating conditions. His first electromagnet was a horseshoe shaped piece of iron that was wrapped with about 18 turns of bare copper wire insulated wire didn t exist yet the iron was varnished to insulate it from the windings. Or by using to high of a voltage on the motor.

The method is based on assuming an equivalent magnetic circuit and representing the true magnetising characteristic of the iron forming the magnetic circuit by an. Copper losses will increases from the higher current and hysteric iron losses will increase. British scientist william sturgeon invented the electromagnet in 1824. It is increasingly difficult to meet the demand for high power density and high torque density of modern motors.