Rotor Core Manufacturer
Precision-engineered laminated rotor cores designed for efficient magnetic performance, high-speed stability, and reliable motor operation.
What Is a Rotor Core?
A motor rotor core is the rotating magnetic component of an electric motor. Manufactured from precision electrical steel laminations, it works together with the stator core to convert electrical energy into mechanical motion. The dimensional accuracy and magnetic performance of the rotor core directly influence motor efficiency, torque output, vibration, and operational stability.As a motor rotor core manufacturer, we always strive to do our best in every machining process and become your reliable rotor core supplier.
Rotor Core View
Our Product Features
High Dimensional Accuracy
Precise control of bore, outer diameter, and critical geometries.
Low Core Loss
Optimized electrical steel for improved motor efficiency.
Excellent Concentricity
Accurate rotor geometry for stable rotation and consistent air gaps.
Low Burr Height
Precision stamping minimizes burrs and reduces electrical losses.
High-Speed Stability
Suitable for high-speed motor applications requiring reliable rotor performance.
Rotor Laminations Stacking
Consistent stack height and alignment for stable magnetic performance.
Custom Rotor Designs
Manufactured according to customer drawings and motor specifications.
Multiple Assembly Options
Interlocking, welding, bonding, and other stacking solutions available.
Precision Rotor Cores Engineered for High-Speed Rotation, Low Loss, and Reliable Motor Performance.
Rotor Core Types
We provide customized rotor cores for BLDC, PMSM, IPM, SPM, induction, high-speed, and other motor applications.
Induction Motor Rotor Core
BLDC Rotor Core
SPM Rotor Core
IPM Rotor Core
PMSM Rotor Core
Designed for squirrel-cage induction motors with precision slots and optimized magnetic performance
Designed for brushless DC motors, supporting permanent-magnet rotor configurations and high-speed operation
Used in permanent magnet synchronous motors, with customized magnetic circuit and magnet positioning designs
Interior permanent magnet rotor cores with embedded magnet slots for high efficiency and excellent high-speed performance
Surface permanent magnet rotor cores designed for motors using magnets mounted on the rotor surface
Hairpin Motor Rotor Core
Precision rotor laminations designed for high-performance automotive and eMobility motor applications
High-Speed Rotor Core
Reinforced and precision-manufactured cores designed for high rotational speeds and demanding operating conditions
Custom Rotor Core
Fully customized rotor core designs based on motor drawings, shaft configuration, slot geometry, material, and performance requirements.
Product Specifications
Specification
Typical Options / Description
Core Type
Rotor Core
Material
Non-Oriented Electrical Steel (NGO)
Steel Grade
Customized according to motor design
Lamination Thickness
0.15 / 0.20 / 0.25 / 0.30 / 0.35 / 0.50 mm
Outer Diameter (OD)
Customized
Inner Diameter (ID)
Stack Height
Slot Number
Customized
Customized
Customized
Slot Geometry
Customized
Magnet Configuration
Surface / Interior / Customized
Magnet Slot Geometry
Interlocking / Welding / Bonding
Stacking Method
Laser Welding / Customized
Welding Method
Adhesive Bonding / Customized
Bonding Method
According to customer drawings
Dimensional Tolerance
Controlled according to specifications
Concentricity
Controlled according to specifications
Flatness
Controlled according to quality requirements
Burr Height
According to selected electrical steel grade
Core Loss
Optimized according to motor design
Magnetic Performance
Dimensional / Burr / Flatness / Concentricity / Visual
Inspection
Support custom rotor core
Customization
Motor Type
BLDC / PMSM / Induction / Custom
Customized according to magnet design
Surface Condition
Clean and free from visible defects
Manufacturing Process
Electrical Steel Selection
Progressive Stamping
Lamination Inspection
Automatic Stacking
Interlocking / Welding / Bonding
Magnet Assembly
Dimensional & Quality Inspection
Packaging & Global Shipping
Select suitable non-oriented electrical steel based on motor design, core loss, magnetic performance, and lamination thickness requirements.
Precision stamping produces rotor laminations with accurate outer diameter, shaft hole, slots, and magnet pockets.
Inspect laminations for dimensional accuracy, burr height, surface condition, and critical geometric features.
Precisely align and stack laminations to achieve consistent stack height, concentricity, and rotor geometry.
Secure the laminations using interlocking, laser welding, or bonding according to the rotor design.
For permanent-magnet rotors, magnets are accurately positioned and secured according to the specified magnetic configuration.
Verify outer diameter, shaft hole, stack height, concentricity, flatness, burr height, and overall appearance.
Qualified rotor cores are prepared for assembly and carefully packaged to prevent deformation and surface damage during transportation.
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Manufacturing Capability
Precision Stamping
High-speed progressive stamping for precise rotor laminations and complex geometries.
Custom Tooling
Custom progressive dies designed for different rotor sizes, slots, and magnet configurations.
Automatic Stacking
Automated stacking and alignment for consistent core height and concentricity.
Laser Welding
Precision laser welding for secure and stable rotor core assemblies.
Interlocking & Bonding
Flexible interlocking and bonding solutions for different rotor designs and applications.
Magnet Assembly
Precision magnet insertion and positioning for IPM and other permanent-magnet rotor cores.
High-Speed Rotor Production
Manufacturing capability for rotor cores used in high-speed and high-efficiency motors.
Mass Production
Stable production capacity for prototype development, small batches, and high-volume orders.
Precision Inspection
Advanced equipment for dimensional, burr, flatness, concentricity, and stack height inspection.
Custom Manufacturing
Rotor cores manufactured according to customer drawings, specifications, and performance requirements.
Advanced stamping, tooling, automatic stacking, welding, bonding, magnet assembly, precision inspection, and scalable production capabilities for customized rotor cores.
Material Selection
Rotor cores typically use non-oriented electrical steel (NGO) selected according to motor speed, magnetic performance, core loss, mechanical strength, and efficiency requirements.
Non-Oriented Electrical Steel (NGO) — Standard material offering balanced magnetic performance.
Low Core Loss Grade — Reduces iron loss and heat generation.
High Magnetic Flux Density Grade — Supports higher power density and motor efficiency.
Thin-Gauge Electrical Steel — Helps reduce eddy-current losses at high frequencies.
High-Strength Electrical Steel — Provides improved mechanical stability for high-speed rotor applications.
Standard-Gauge Electrical Steel — Balances magnetic performance, production efficiency, and cost.
Insulation Coating — Reduces interlaminar eddy-current losses between laminations.
Customized Material Grade — Selected according to specific motor requirements.
Our material suppliers
BAOSTEEL
SHOUGANG
TISCO
High-Performance Electrical Steel
Quality Control
Material Inspection
Verify electrical steel grade, thickness, surface condition, and material certificates.
Dimensional Inspection
Check outer diameter, inner diameter, shaft hole, slot geometry, and critical dimensions.
Burr Inspection
Control stamping burr height to ensure proper lamination quality and assembly consistency.
Flatness Inspection
Verify lamination and core flatness to prevent deformation during rotor assembly.
Concentricity Inspection
Measure the relationship between critical diameters to ensure accurate rotor alignment and air-gap consistency.
Stack Height Inspection
Verify the assembled core height and lamination alignment against specified tolerances.
Core Loss Testing
Evaluate magnetic losses to confirm the selected material and core performance meet requirements.
Final Inspection
Conduct comprehensive visual, dimensional, and structural checks before packaging and shipment.
Ensures consistent dimensions, magnetic performance, structural integrity, and reliable quality of every rotor core.
Applications
Rotor cores are used in a wide range of electric motors where efficient magnetic performance, dimensional accuracy, and mechanical stability are required.
Electric Vehicles
BLDC Motors
PMSM Motors
Industrial Motors
Servo Motors
Robotics & Automation
Frequently Asked Questions
What material is used for rotor cores?
Rotor cores are mainly manufactured from non-oriented electrical steel (NGO). Material grade and thickness are selected according to core loss, magnetic performance, motor speed, and efficiency requirements.
What types of rotor cores can you manufacture?
We manufacture BLDC, PMSM, IPM, SPM, induction motor, high-speed, and customized rotor cores for different motor applications.
Can rotor cores be customized?
Yes. Outer diameter, shaft hole, stack height, slot geometry, magnet pockets, lamination thickness, material grade, and stacking method can be customized according to customer drawings.
What lamination thickness is available?
Typical lamination thickness ranges from 0.15 mm to 0.50 mm, with the specific thickness selected according to motor speed, operating frequency, core loss, and efficiency requirements.
Which stacking methods are available?
Rotor cores can be manufactured using interlocking, laser welding, or adhesive bonding, depending on the motor design and structural requirements.
Can you manufacture IPM and SPM rotor cores?
Yes. We can manufacture rotor laminations for interior permanent magnet (IPM) and surface permanent magnet (SPM) motors, including customized magnet slots and positioning features.
How do you control rotor core quality?
Quality is controlled through material inspection, dimensional inspection, burr inspection, flatness inspection, concentricity inspection, stack height verification, and final inspection.
Can you provide prototype and mass production?
Yes. Prototype, small-batch, and high-volume production are available, with customized tooling and manufacturing processes according to project requirements.
Upload your CAD files and detailed specifications for a rapid review by our metallurgical and die design engineers. We are ready to assess your project requirements with precision and efficiency.