Induction Motor Stator and Rotor
- We specialize in custom induction (asynchronous) motor stator and rotor solutions, featuring precise lamination, optimized slot geometry, and high-grade silicon steel.
- Our components offer low core loss, high magnetic efficiency, and strong thermal stability for reliable performance. Custom designs suit various voltage, frequency, and size needs.
- Dimensional Tolerances: Within ±0.01 mm
- Stator Types: Slotted, semi-closed, skewed, and segmented
- Rotor Types: Squirrel cage, wound
- Rapid prototyping shortens lead times
- Supports high-frequency motor requirements
How the Stator and Rotor Work Together in an Induction Motor?
- In an induction motor, the stator and rotor work together through electromagnetic induction to turn electrical energy into mechanical motion.
- Laminated steel cores with copper windings make up the stator. When AC flows through these windings, it creates a rotating magnetic field across the gap between the stator and rotor.
- The rotor, often a squirrel-cage or wound type, isn’t connected to the power source. Rather, a rotor current is induced by the stator's rotational field. By interacting with the stator's field, this current's magnetic field creates torque and spins the rotor.
- The stator’s field spins slightly faster than the rotor—this difference is called slip and is needed for induction. Good lamination, accurate winding, and a proper air gap are key for efficient torque, low energy loss, and smooth motor operation.
Induction Motor Types We Support
For single-phase, three-phase, AC, and bespoke high-frequency induction motors, we produce stator and rotor cores with precisely engineered performance.
Single-Phase Induction Motor
- Compact stator design with auxiliary winding; rotor typically squirrel cage type, ensuring reliable performance in low-power single-phase configurations.
Three-Phase Induction Motor
- Three-slot stator winding structure with robust squirrel cage or wound rotor; delivers efficient, balanced power conversion for industrial-grade motors.
AC Induction Motor
- Laminated stator and rotor cores reduce eddy current loss; supports wide-voltage AC systems with stable magnetic field interactions.
Custom High-Frequency Induction Motor
- Precision stator and rotor cores with high-grade silicon steel, optimized for low-loss, high-frequency response and compact motor architectures.
Induction Motor Stator Types
We offer slotted, semi-closed, skewed, and segmented induction motor stator designs that guarantee effective winding, noise reduction, and magnetic performance.
Conventional Slotted Stator
- Open slots enable easy coil insertion and better cooling.
- Slot pitch 15–30°, with 24–96 slots per design.
- Lamination thickness 0.5–10 mm using silicon steel.
- Higher magnetic noise due to abrupt air gap variation.
Semi-closed Slot Stator
- Narrower slot opening reduces magnetic leakage.
- Slot fill factor typically between 40–55%.
- Stronger tooth structure supports 3000+ rpm speed.
- Improved flux direction with non-oriented silicon steel.
Skewed Slot Stator
- Skewed slots reduce torque ripple and noise.
- Typical skew angle ranges from 3° to 15°.
- Ideal for 36–72 slot three-phase stators.
- Smooth flux improves torque linearity and quietness.
Segmented Stator
- Arc segments form a complete circular stator.
- Segment width 15°–45°, tight-fit joints reduce reluctance.
- Supports automated winding for large-diameter motors.
- Laminations 0.3–0.5 mm ensure high flux efficiency.
Induction Motor Rotor Types
Squirrel cage and wound rotors are two of our induction motor rotor kinds; they provide torque control, low resistance, high durability, and less electromagnetic torque ripple.
Squirrel Cage Rotor
- Copper or aluminum bars and end rings around a laminated core.
- Rotor resistance ranges from 0.1 to 0.3 ohms.
- Simple design, high strength, and low manufacturing cost.
- 28–66 slots; skewed bars reduce locking and torque ripple.
Wound Rotor (Slip Ring Rotor)
- Three-phase windings with slip rings attached to external resistors.
- Adjustable resistance from 0.2 to 3 ohms for tuning.
- Enables precise control of speed and torque via resistance.
- Three slip rings with brushes; needs periodic maintenance.
Customer Case
A fan motor manufacturer in Munich, Germany, required a custom rotor-stator set for their 3-phase induction motors used in industrial cooling fans.
Customer Requirements
- Low iron loss stator for energy efficiency.
- Rotor bar shape optimized for torque at low speed.
- Air gap tolerance ≤ 0.2 mm for enhanced magnetic efficiency.
- Custom stator OD: 280 mm, stack height: 120 mm.
- End-ring ventilation and dynamic rotor balancing.
Our Solution
- Selected high-grade 0.35 mm silicon steel laminations for the stator core.
- Manufactured rotor with 24 precision-cast aluminum bars skewed by 15°.
- Stator slots insulated with class-F material, designed for tight winding insertion.
- Rotor balanced to ISO G1.0 standard; overall assembly passed run-out test ≤ 0.03 mm.
Results
| Parameter | Customer Requirement | Delivered Result |
| Stator Outer Diameter | 280 mm | 279.8 mm |
| Rotor Bar Skew Angle | 15° | 15° ± 0.5° |
| Air Gap Tolerance | ≤ 0.2 mm | 0.18 mm |
| Stack Height Uniformity | ±0.1 mm | ±0.08 mm |
| Total Harmonic Distortion | ≤ 5% | 4.2% |
