How to Repair pet food extruder pellet machine Motor Failure?

Troubleshooting motor malfunctions must follow the principle of "power off first, then test" to avoid electric shock accidents. First, disconnect the main power supply to the motor and check the motor surface for burn marks or unusual odors to preliminarily determine the type of fault.

Common causes and repairs for motors failing to start:

1. Power supply issues: Check if the power cord is damaged or if the plug has poor contact. If the power cord is damaged, replace the insulated power cord. If it is a three-phase motor, check if any phase is missing. This can be done by using a multimeter to test the voltage of each phase. If a phase is missing, contact an electrician to repair the power supply line.

2. Overload protection tripping: In extruders, excessive load due to raw material blockage, screw jamming, etc., triggers the protection device. In this case, first troubleshoot and resolve the mechanical faults in the extruder (such as clearing blockages or repairing jammed screws), then press the overload protection reset button and restart the motor.

3. Short circuit or open circuit in the motor windings: Use a multimeter to test the winding resistance. If the resistance is 0 or infinite, it indicates a winding fault, requiring a professional electrician to rewind the windings or replace the motor.

Repair methods for abnormal motor operation: If the motor makes a loud noise during operation, it is mostly due to bearing wear or poor lubrication. Remove the motor end cover and check the bearings for cracks, missing balls, etc. If the bearings are worn, replace them with the same model; if the bearings are intact, add special motor grease to ensure adequate lubrication. If the motor overheats during operation (casing temperature exceeds 70℃), in addition to overload, it may be due to a damaged cooling fan or blocked vents. Clean the vents of debris, replace the damaged cooling fan, and improve heat dissipation.

After repair, the motor needs to undergo no-load and load tests: Start the motor under no-load and observe whether it runs smoothly and without noise. Measure the no-load current to see if it is within the normal range. During the load test, connect the motor to the extruder, gradually increase the feed rate, and monitor the motor temperature and current changes to ensure stable operation under rated load. The key to preventing motor failure lies in daily maintenance: Regularly clean dust and debris from the motor surface, check the bearing lubrication monthly, and test the winding insulation performance quarterly. Avoid long-term operation of the motor in harsh environments.

For old motors that have been in use for more than 5 years and frequently fail, it is recommended to replace them with new motors. New motors can be energy-saving variable frequency motors, which not only run more stably but also reduce energy consumption and have a higher cost performance in the long run.

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