What Are The Differences Between A Motor Stator Core And Rotor
Oct 20, 2025
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Motor Stator And Rotor Core
The stator core and rotor are essential components of a motor, and they are necessary for driving the shaft to rotate. The stator is fixedly mounted on the housing-usually, the stator is equipped with coils. The rotor is fixed on the base (or frame) via bearings or bushings. The rotor contains electrical steel sheets, and the rotor of a DC motor is also wound with coils. When both are in operation, the electrical steel sheets of the stator and rotor generate a magnetic field under the action of current in the coils, and this magnetic field drives rotation. The stator of an induction motor consists of a stator core, stator windings, and a frame.
Stator Core
The stator core serves as part of the motor's magnetic circuit and provides a structure for embedding stator windings.
It is composed of electrical steel sheets, with insulating varnish coated on both sides of each sheet. This insulates the sheets from one another, reducing core loss caused by the rotating magnetic field in the stator core.
The inner circle of the stator core is punched with several identical slots, which are used to embed the stator windings.
Rotor Core
The rotor core is also part of the motor's magnetic circuit. It forms the motor's magnetic path together with the stator core and the air gap between them.
For small and medium-sized AC motors, the rotor core is mostly mounted directly on the motor shaft.
For large AC motors, the rotor core is mounted on a bracket, and the bracket is sleeved on the rotating shaft.
Motor Core Features
- Excellent Magnetic Performance & Low Loss: Mostly made by stacking cold-rolled electrical steel sheets (with 0.8%-4.8% silicon content), enabling efficient magnetic conduction. The insulating coating on the steel sheet surface reduces eddy current loss and lowers motor energy consumption.
- Strong Structural Adaptability: Stator cores have slots for embedding windings; rotor cores feature different slot designs based on motor types (e.g., squirrel-cage, wound-rotor). They require high stacking precision, and the air gap (between stator and rotor) must be evenly controlled at 0.2-1mm.
- Good Working Condition Adaptability: Electrical steel sheets have good toughness for stamping. The core can work stably at 55-130℃, with resistance to overload and vibration, meeting motor needs in different environments.
Motor Core Applications
Industrial Sector: Cores for induction motors driving fans, water pumps, and machine tools.
Home Appliance Sector: Cores for small/medium motors in washing machines and air-conditioning compressors.
New Energy Sector: High-precision cores for new energy vehicle drive motors and charging pile transformers.
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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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;
1,000+
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