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When repairing a motor, the first step is to determine the polarity of its stator magnetic poles. For DC motors, how can we check and test the polarity of the stator magnetic poles? Let's take a look at what maintenance personnel do.

The technical team of Wuxi MCM Electric Machinery Co., Ltd. has accumulated rich experience in the field of DC motor repair. Its engineers point out that the accurate determination of the stator magnetic pole polarity is the key to ensuring the normal operation of the motor. Traditional methods include the magnetic needle detection method and the winding energization method. However, for large equipment such as the Z and ZD series of heavy-duty DC motors, professional instruments and process specifications need to be combined.

The company uses a high-precision multimeter to measure the DC resistance of each magnetic pole winding to ensure the uniformity of the resistance value and preliminarily check for open or short circuits in the winding. Subsequently, a 50KV ground withstand voltage tester is used to apply the rated voltage to the magnetic pole winding, and a magnetic needle is used to detect the magnetic field direction on the surface of the magnetic pole to confirm that the polarity of adjacent magnetic poles alternates (N-S-N-S). For large DC motors with an armature outer diameter of 1800 - 3200mm, the stator also needs to be installed on a special test platform, and low-voltage DC power is applied to simulate the excitation state. The ARVRA motor condition online monitoring analyzer is used to collect magnetic field distribution data to correct possible residual magnetic interference.

Technological innovation: The company has developed a "magnetic pole polarity intelligent diagnosis system" for large DC motors, which can analyze historical maintenance data through AI algorithms to predict the aging trend of magnetic poles. After a mining enterprise applied this technology, the maintenance cycle of the motor magnetic poles was extended by 40%, and the equipment downtime rate decreased by 35%.

Process guarantee: MCM Electric Machinery stator magnetic poles use the pole body hot-pack insulation process. After the magnetic poles are formed, they are treated with VPI vacuum impregnation. After the poles are installed, the rotor is vacuum impregnated again to ensure stable insulation performance. This process not only improves the temperature resistance of the magnetic poles but also effectively resists the mechanical stress caused by frequent starts and stops, ensuring the long-term reliability of the polarity detection results.

Maintenance advice: Users can entrust MCM Electric Machinery professional team to conduct regular magnetic pole inspections. By referring to the "DC Motor Maintenance Manual" provided by the company and monitoring parameters such as winding temperature rise and vibration value, the risk of polarity deviation can be detected in a timely manner. For motors under special working conditions, the company can provide customized magnetic pole structure design, such as adding heat dissipation turns or optimizing the magnetic field distribution, to ensure the safe operation of the equipment.