How To Avoid The Two Major Losses Of Motor Core
Oct 20, 2025
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Two Major Losses Of Motor Core
Motor core loss, commonly referred to as "iron loss", is also known as "magnetic core loss" or "excitation loss".
It refers to the power loss in magnetic materials caused by alternating or pulsating magnetic fields, manifested in the form of heat. It is divided into two parts: hysteresis loss and eddy current loss.
1. Hysteresis Loss
Hysteresis loss is the energy consumed due to hysteresis in ferromagnetic materials during repeated magnetization, mainly caused by the friction of magnetic domain rotation. Hysteresis means that when the magnetic state of ferromagnetic materials changes, the magnetization intensity lags behind the magnetic field intensity. The relationship between its magnetic flux density (B) and magnetic field intensity (H) presents a hysteresis loop.
After one cycle, the hysteresis loss per unit volume of the core is proportional to the area of the hysteresis loop. This part of energy is converted into heat, which increases the temperature of the equipment and reduces efficiency. It is a component of iron loss in electrical equipment and is undesirable in equipment such as AC motors. Soft magnetic materials have narrow hysteresis loops, so their hysteresis loss is relatively small. For this reason, electrical steel sheets are widely used in motors, transformers, relays and other equipment.
2. Eddy Current Loss
Eddy current loss refers to the energy loss caused by induced currents in a conductor when the conductor moves in a non-uniform magnetic field or is in a magnetic field that changes with time. The closed loops of current formed inside the conductor are called eddy currents (also known as Foucault currents).
Measures to Reduce Motor Core Loss
Reduce the magnetic density: Increase the length of the core to lower the magnetic flux density, but this will increase the amount of iron used in the motor.
Reduce the thickness of core sheets: Decrease the loss caused by induced currents. For example, replacing hot-rolled electrical steel sheets with cold-rolled ones can reduce the thickness of electrical steel sheets, but thinner core sheets will increase the number of core sheets and the manufacturing cost of the motor.
Use cold-rolled electrical steel sheets with good magnetic conductivity: Reduce hysteresis loss.
Adopt high-performance insulating coatings for core sheets.
Optimize heat treatment and manufacturing techniques: Residual stress in core sheets after processing will seriously affect the loss of the motor. During the processing of electrical steel sheets, cutting methods and punching stress have a great impact on core loss. Cutting along the rolling direction of electrical steel sheets and performing heat treatment on electrical steel stamped sheets can reduce the loss by 10%-20%.
specification
Raw Material: Our premium CRGO silicon steel is sourced exclusively from renowned manufacturers, Baosteel and WISCO, ensuring top-tier quality for your transformer core laminations.
GRADE we supply:B30P120, B30P105, B30R100, 27QG120, 27QG100, 23Q110, 23QG100, 23QG095, 23RK090, 23RK085, 23QG085, 23RK085, 23QG085, 23RK080, 23RK075, B23R070, 20QG085, 20RK080, 20RK075, B20R070, B20R065,M0H,M1H,M2,M3,M4,M5.
23HP75d, 23HP80d, 23HP85d, 23HP90d, 23HP95d, 23HP100, 23HP100d, 27HP100, 27HP110, 27CG110, 27CG120, 30CG120, 30CG130
| Type | Grade | Width | Max Core Loss@P1.7T/50Hz | Lamination Factor(%) | Min Induction@B800 |
| Common Type | 23Q110 | 35-1200mm | 1.10w/kg | 97.2 | 1.82T |
| 23Q120 | 1.20w/kg | 97.2 | 1.82T | ||
| 27Q120 | 1.20w/kg | 97.5 | 1.82T | ||
| 30G120 | 1.20w/kg | 98 | 1.82T | ||
| High Induction Type |
B20P085 | 35-1200mm | 0.85w/kg | 97 | 1.86T |
| B23P085 | 0.85w/kg | 97.2 | 1.88T | ||
| B23P090 | 0.90w/kg | 97.2 | 1.88T | ||
| B23P095 | 0.95w/kg | 97.2 | 1.88T | ||
| B23P100 | 1.00w/kg | 97.2 | 1.88T | ||
| B27P095 | 0.95w/kg | 97.5 | 1.89T | ||
| 27QG100 | 1.00w/kg | 97.5 | 1.89T | ||
| B30P105 | 1.05w/kg | 98 | 1.89T | ||
| Domain Refined High Induction Type(Laser) |
B20R070 | 35-1200mm | 0.70w/kg | 97 | 1.86T |
| B23R085 | 0.85w/kg | 97.2 | 1.88T | ||
| B27RK085 | 0.85w/kg | 97.5 | 1.89T |
We meticulously calculate and regularly update quotations based on your comprehensive drawings, ensuring precision and cost-effectiveness in every transaction.
Upon receiving your confirmation, we seamlessly transition into production, adhering stringently to the meticulously detailed drawings you provide to ensure flawless execution.
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Gnee provides premium iron cores to the world. Our cores can be selected in a wide range of materials, shapes, applications, manufacturing techniques, etc., to meet customers' diverse demands. Explore our wide product range now~
Manufacturing Process
1. Raw Material Sourcing
2. Slitting
3. Punching
4. Laminating
5. Core Forming
6. testing
GNEE EC
Founded in 2008 and located in Anyang in China, Gnee Electric is a high-tech enterprise specializing in researching and manufacturing iron core products.
The company currently occupies over 20,000 square meters and employs more than 200 people, including over 80 professionals. After more than 18 years of development, we have built our own magnetic material production base and independently develope, produce, and sell various kinds of iron cores. The common types include silicon steel cores, motor cores, transformer cores, toroidal iron cores, special-shaped cores, custom cores, and others. Our cores are widely applied in different sectors including transformers, motors, mutual inductors, voltage stabilizers, welding machines, magnetic amplifiers, and instrumentation, providing diverse core solutions to global customers.
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Happy Clients
Why Choose GNEE EC?
GNEE EC was founded in 2008, which is a National High-tech Enterprise & Famous Brand Enterprise in China, developing into a professional manufacturer and supplier of high-quality iron cores.
18+
Over 18 years of success in the iron core industry;
National High-tech Enterprise & Famous Brand Enterprises in China;
200+
Over 200 employees;
The R&D team has more than 80 experienced engineers and the production team has more than 100 skilled staffs;
35+
Annual turnover up to 35 million dollor per year;
Owns many sets of highly automatic winding, annealing, and assembling machines;
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Over 1000 customers in domestic and overseas markets;
core Products are exported to more than 70 countries in the world;
Gnee Iron Core Factory Overview
Meet Our Sales Manager
"The Core of the Iron Core, the Power of Leadership" - See Our Great Decision-Makers Deeply Engaged in the Magnetic Materials Industry.
Edison Zhang
CEO
Kelly Zhang
General Manager
Alex Cao
Sales Manager
Industries Served
Automobile Industry
New Energy
Transformer Applications
Our Mission
Strive To Create world-class Iron core brand
With 18 Years of industry experience, we focus on the research, development, and manufacturing of high-quality iron cores for electricity, industrial control, new energy, and automotive markets