Low Core Loss (PT):
Core loss refers to the ineffective electric energy consumed when the core is magnetized under an alternating magnetic field of ≥50Hz, referred to as iron loss, also called alternating loss, and its unit is W/kg. This kind of ineffective electric energy consumed due to various obstacles to the change of magnetic flux not only loses electric energy through the heating of the iron core but also causes the temperature rise of the motor and transformer. The iron loss (PT) of electrical steel includes three parts: hysteresis loss, eddy current loss (Pe), and abnormal loss (Pa).
Electrical steel plates have low iron loss, which can not only save a lot of electrical energy, but also extend the operating time of motors and transformers, and simplify cooling devices. Since the power loss caused by the iron loss of electrical steel plates accounts for 2.5% to 4.5% of the annual power generation in various countries, countries producing electrical steel plates always try every means to reduce iron losses and use iron loss as the most important indicator to evaluate the magnetic properties of products. The iron loss value of the product is used as the basis for classifying product brands.
High Magnetic Induction Intensity (B):
Magnetic induction intensity is the number of magnetic force lines passing through the unit cross-sectional area of the iron core, also called magnetic flux density. It represents the magnetizing ability of the material, and the unit is T. The magnetic induction intensity of the electrical steel plate is high, the excitation current (also called no-load current) of the iron core is reduced, and the copper loss and iron loss are reduced, which can save electric energy.
When the power of the motor and transformer remains unchanged, the magnetic induction intensity is high, the design Bm can be increased, and the cross-sectional area of the iron core can be reduced, which reduces the volume and weight of the iron core and saves the number of electrical steel plates, wires, insulation materials, and structural materials. It can reduce the total loss and manufacturing cost of motors and transformers and is beneficial to the manufacturing, installation, and transportation of large transformers and large motors.
The design Bm of grain-oriented silicon steel is as high as 1.7~1.80T, which is close to the B8 value, so B8 is used as the guaranteed magnetic induction value. The design Bm of the motor is about 1.5T, which is close to the B50 value of cold-rolled non-oriented electrical steel. Therefore, B50 is used as the guaranteed magnetic induction value of cold-rolled non-oriented silicon steel. The magnetic induction of hot-rolled silicon steel is lower, and B25 is usually used as the guaranteed value.
Non oriented silicon steel
