Title: Methods for Testing the Effectiveness of Motors After Maintenance

Introduction: Jkongmotor, a renowned brand in the field of motor maintenance and repair, emphasizes the importance of thorough testing post-repair to ensure optimal performance. This article focuses on the testing methods employed during the repair process of the stator winding in motors.

Stator Winding Repair Testing: During the stator winding repair process, it is essential to conduct secondary testing. The first test is carried out before the varnish impregnation and drying process, while the second test is conducted afterward. Testing before varnish impregnation ensures that any issues with the coil winding can be easily and quickly addressed, as the coils are not yet fixed. Rectifying problems post-varnish impregnation can be significantly more challenging.

Comprehensive Testing: Following the completion of motor maintenance work, a comprehensive routine testing is imperative. This includes discussing the insulation resistance testing of the stator winding and the detection of three-phase voltage, current, and rotating magnetic fields. It is crucial to note that the working environment and testing equipment for motor repair differ from those used in motor manufacturing. Given the limited number of secondary maintenance tasks for motors, a makeshift insulation resistance testing bench can be constructed, with the voltage typically capped at 1100V. It is recommended to conduct the insulation resistance test on the stator three-phase winding immediately after the coil bundling without varnish drying or rotor assembly. The testing duration should not exceed 60 seconds. In normal circumstances, if the insulation resistance test is successful, the inter-phase and turn-to-ground insulation resistance of the stator three-phase winding should meet the required standards.

Voltage, Current, and Rotating Magnetic Field Testing: When conducting three-phase voltage, current, and rotating magnetic field tests on the stator winding, it is unsafe and unscientific to directly connect to the mains voltage (380/220V). Using an autotransformer as a power source is preferable. During testing, connect the autotransformer's three-phase output directly to the stator three-phase winding (without rotor assembly). Place a steel ball (approximately 0.5-1cm) in the middle of the stator core according to its diameter, and gradually increase the voltage (usually controlled at 36V) using the autotransformer. The steel ball will rotate within the rotating magnetic field, allowing for the simultaneous monitoring of the stator winding's three-phase voltage and current. This method ensures safety, reliability, and enables the observation of temperature changes and other data in the stator coils.

Jkongmotor Products: Jkongmotor's products are characterized by superior quality, reasonable pricing, and widespread applications in various industries such as wind power generation, solar energy equipment, new energy devices, high-speed rail equipment, electronics, medical devices, CNC machinery, woodworking machinery, material handling, conveyor systems, precision measuring instruments, industrial automation machinery, electronic semiconductor equipment, robots, robotic arms, injection molding machinery, packaging machinery, and other fields requiring precise transmission control and positioning.

Conclusion: With a robust technical team and a dedicated management team, Jkongmotor is a dynamic and innovative company that prioritizes professionalism, dedication, and ethical conduct. Since its inception, the company has been committed to providing professional services and meeting the needs of its customers.

In conclusion, Jkongmotor stands as a reliable and efficient partner for motor maintenance and repair, offering top-notch products and services that cater to a wide range of industries and applications.