What factors affect the yield rate of fully automatic stator winding machines? How to improve winding quality?

Fully automatic winding machines primarily handle the stator winding process. Different manufacturers’ winding machines vary in configuration and quality, resulting in differences in the quality of the wound coils. Improving winding quality requires comprehensive optimization across multiple dimensions, including equipment, processes, environment, and operation. Below, Vacuz will provide a brief introduction!

I. Core Factors Affecting Yield

1. Tension Control Stability

Problem: Tension fluctuations can lead to inconsistent coil tightness, interlayer collapse, or wire breakage, especially during high-speed winding, where changes in coil diameter exacerbate tension differences.

Case Study: One company, through a high-precision electronic tension controller combined with a PID algorithm, controlled tension fluctuations within ±3%, reducing the breakage rate by 80%.

2. Wire Laying Accuracy

Problem: Wire laying deviations can cause slot crossings and excessive stack thickness, affecting coil neatness, slot fill factor, and end forming quality.

Case Study: A servo motor drive and precision lead screw transmission achieve micron-level resolution. Combined with follow-up control, this ensures that the wire laying speed is synchronized with the spindle speed, avoiding “wire piling” or “missing wire.”

3. Enamelled Wire Damage Control

Problem: Burrs or sharp edges on conductor contact parts (such as wire tips and guide rollers) can scratch the insulation layer of the enamelled wire, causing inter-turn short circuits.

Case Study: Using tungsten carbide or ceramic-coated wire tips with rounded edges and a straight winding path design reduces the wire damage rate from 1.5% to ≤0.2%.

4. Wire Break Detection and Response

Problem: Failure to detect wire breaks in a timely manner leads to idle winding, wasting materials and time.

Case Study: Installing a wire break sensor in the winding path automatically stops the system and triggers an audible and visual alarm, reducing troubleshooting time by 70%.

5. First Turn Positioning and Wire Hanging Accuracy

Problem: Inaccurate manual wire hanging positioning can easily lead to first turn offset and slot skipping.

Case Study: Configuring a pneumatic wire clamping mechanism or a vision-assisted positioning system automatically guides the wire end into the predetermined slot, achieving a first turn positioning error of ≤0.01mm.

6. Mold Precision and Rigidity

Problem: Insufficient mold precision or unstable clamping can lead to stator vibration or displacement, causing wire routing disorder.

Case Study: High-precision CNC machine tools are used to process the molds (error ≤ ±0.02mm). The clamping mechanism uses a hydraulic locking method to adapt to different stack thicknesses and outer diameters.

II. Key Measures to Improve Winding Quality

1. Equipment Hardware Upgrade

Core Components: High-precision servo motors, encoders, and ball screws are selected to ensure accurate motion transmission.

Tension System: A closed-loop tension controller is configured to dynamically adjust the tension in real time, supporting a speed-tension mapping model.

Wire Routing Mechanism: Smooth, wear-resistant wire routing wheels are used, with a diameter matched to the wire diameter to reduce sliding resistance.

2. Process Parameter Optimization

Winding Speed: The speed is adjusted according to the wire diameter to avoid inertial errors.

Tension Setting: The tension is preset according to the elastic modulus of the wire (e.g., 0.5-1.2N for 0.1mm copper wire), establishing a tension-speed compensation curve.

**Wire Spacing:** Properly set the wire spacing and winding width to avoid tangling or crossing caused by excessively long or short wire bundles.

3. **Environmental Control:**
**Temperature and Humidity:** Maintain workshop temperature at 20±2℃ and humidity ≤65% to prevent softening of the enameled wire insulation or electrostatic breakdown.

**Vibration Reduction and Noise Reduction:** Install vibration damping pads at the bottom of the equipment to reduce the impact of vibration on accuracy.

4. **Operation and Maintenance Standards:**
**Standardized Operation:** Establish SOPs; operators must be specially certified.

**Preventive Maintenance:** Regularly inspect the wear of key components such as guide rails, lead screws, and tension devices; replace tension springs every 5000 winding cycles.

**Real-time Monitoring:** Deploy sensors to monitor parameters such as position, tension, and speed; introduce automated detection systems (e.g., visual inspection for defects such as missing wires and overlaps).

5. **Intelligent and Data-Driven Approach:**
**Process Database:** Record winding parameters for different stator specifications, supporting rapid retrieval and optimization.

**AI Algorithms:** Introduce AI algorithms such as neural networks to automatically optimize tension and speed parameters, reducing manual adjustment time. Remote monitoring: Supports data logging and remote diagnostics, facilitating process analysis and fault tracing.

What factors affect the yield rate of a fully automatic stator winding machine? How to improve winding quality? Vacuz has provided a brief explanation above; we hope this information is helpful!