What is the impact of 0.01mm error in the progressive die of automotive micro motors on motor performance?- Zhejiang Ruixin Mould Technology Co., Ltd

What is the impact of 0.01mm error in the progressive die of automotive micro motors on motor performance?

1. Error leads to uneven stacking of iron cores, reducing motor efficiency
The automotive micromotor progressive die is responsible for stamping laminated iron cores. If the concentricity error of the mold exceeds 0.01mm, it will cause misalignment or air gaps during the lamination of silicon steel sheets. These micro defects will significantly increase the eddy current loss and hysteresis loss of the iron core, leading to an increase in heat generation and a decrease in energy efficiency during motor operation.

2. Dynamic imbalance exacerbates bearing wear and shortens motor life
The iron core produced by the automotive micromotor progressive die is the core load-bearing structure of the rotor. When the concentricity error exceeds 0.01mm, centrifugal force imbalance will occur during rotor rotation, causing the bearing to bear additional radial loads. Under long-term operation, this dynamic imbalance will accelerate bearing wear, increase motor noise and vibration.

3. Air gap magnetic field distortion affects control accuracy
In scenarios such as electronic power steering (EPS) or automatic headlight adjustment, the motor needs to adjust torque or angle in real-time based on the signal. If the error of the progressive die of the automotive micro motor leads to uneven distribution of the magnetic field in the iron core, local distortion of the air gap magnetic density will occur. This distortion may interfere with the signal acquisition of Hall sensors, causing misjudgment by the control unit and ultimately affecting the accuracy of steering force or lighting angle.

4. Error amplification under high-speed stamping threatens batch consistency
The automotive micromotor progressive die is continuously stamped at a speed of 400 times per minute, and small errors can accumulate and amplify during high-speed production.

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