Under normal circumstances, minor, medium and major overhauls must be carried out in accordance with the maintenance standards within the maintenance cycle. If there are no conditions and it is determined that the maintenance cycle can be extended, the technicians of the branch factory shall take preventive measures and report to the Equipment Department for approval at the same time. The maximum maintenance cycle shall not exceed twice that stipulated in these measures.

The main purpose of the maintenance of china permanent magnet synchronous motor is to eliminate the defects and hidden dangers of the motors ina timely manner, restore and improve the original working performance and design level of the motors, and ensure the safe and reliable operation of the motors.

I. Basic Requirements for the Maintenance of china permanent magnet synchronous motor

For motors with all stator and rotor windings replaced, the insulation class of the new coils should not be lower than that of the original motor. After major overhauls, tests should be conducted in accordance with the electrical equipment test standards.

2. The nameplate of the motor must be in good condition and a maintenance sign must be hung.

3. Tighten the loose screws and ensure that all electrical welding joints are firm. Each disassembly point must be marked. When necessary, the rotor should be dynamically balanced.

4. When extracting the core of an electric motor or lifting important components, it should be done smoothly, slowly and gently to ensure safety. It is not allowed to cause damage to the coil, core or shaft diameter, etc.

Before determining the maintenance items, a comprehensive analysis of the defects and faults that have occurred in the motor should be conducted, a maintenance technical plan should be formulated, and maintenance records should be kept. After the maintenance, the workshop should make a technical summary.

Ii. Maintenance Cycle of china permanent magnet synchronous motor

The maintenance of china permanent magnet synchronous Motors can be divided into major overhaul, medium overhaul and minor overhaul. According to the differences in model, working conditions and working environment, china permanent magnet synchronous Motors can be classified into four major categories.

1. General small and medium-sized continuous operation squirrel-cage asynchronous motors.

2. General small and medium-sized continuous operation wound-rotor asynchronous motors, DC motors and power amplifiers.

3. Ac and DC motors for metallurgical cranes.

4. Large AC/DC motors (including synchronous motors)

Note 1: Motors with frame size 16 or above, or with the center height of the frame exceeding 630mm, or with the outer diameter of the stator core greater than 990mm are classified as large motors. Medium-sized motors are classified for frames 11 to 15, or those with a center height ranging from 355mm to 630mm, or those with an outer diameter of the stator core between 560 and 990mm. Small motors are classified for frame sizes 10 and below, with the center height of the frame ranging from 80mm to 315mm, or the outer diameter of the stator core between 125 and 560mm.

Note 2: In poor environmental conditions (such as dampness, dust, vibration, temperature, corrosive gases, etc.), the cycle should be shortened. When operating at a high load rate for a long time, the cycle should be shortened. For those that start frequently, the cycle should be shortened. Where potential hazards are found, special attention should be paid to monitoring the operation and maintenance should be carried out as soon as possible. Each unit should formulate annual and monthly motor maintenance and repair plans.

Note 3: Each workshop should decompose based on the availability of spare parts, the usage environment of the motor, the load and other actual conditions. Each workshop should formulate the maintenance cycle for electric motors and file it with the Equipment Department.

Minor repair of china permanent magnet synchronous motor: Perform tasks such as dust cleaning, drying, and adding grease to the bearings of the motor. Including motor blowing cleaning (disassembly of small motors); Repair the partial insulation damage of the motor. Inspection, cleaning or oil change of the motor bearings; Brush replacement and brush box adjustment; Conduct general mechanical inspections and treatments; Commutator groove chamfering and sanding; Conduct general inspections and appraisals.

The intermediate repair of china permanent magnet synchronous motor includes or partially includes: shell cleaning, replacement of carbon brushes, handling of broken leads, replacement of bearings, and replacement of lubricating oil; Inspect and handle the slot wedges, spacers and binding wires of the stator and rotor of the motor. Turning and sanding of the commutator or collector ring of the motor; Inspect and handle the mechanical components of the motor, such as fans, end covers, yokes and rotor brackets, etc. Inspect and handle the ventilation and cooling system of the motor. Inspection and treatment of the insulating plates of bearings and bearing housings; Grind the slip rings, impregnate the windings with varnish, perform dynamic balancing, and carry out necessary tests in accordance with the electrical equipment test standards. It includes all the contents of minor repairs.

Major overhauls of china permanent magnet synchronous motors include or partially include: partial or complete replacement of the stator and rotor windings of the motor, and impregnation and drying. Disassembly, inspection or replacement of the commutator of a DC motor; Bearing bush replacement and grinding; For mechanical defects of the motor, carry out transformational reinforcement and treatment, including all contents of minor and medium repairs, without changing the original design performance requirements of the motor.

Iii. Before disassembling the china permanent magnet synchronous motor, original records should be made to understand the operating conditions of the motor.

Measure the insulation resistance and absorption ratio of the stator and rotor windings of the motor (record the current temperature and humidity), DC resistance (record the current temperature), air gap between the stator and rotor, bearing bush clearance, and axial crosstalk of the motor, etc.

Iv. Disassembly of china permanent magnet synchronous motor

The disassembly of the motor should be carried out in accordance with the process regulations. For key parts of the motor such as couplings, brush frames, and winding connections, proper markings should be made during disassembly. For the removed components and parts, a designated person should be responsible for them and they should be properly kept. When disassembling, special tools should be used as much as possible and civilized construction should be carried out.

V. Inspection of Components of china permanent magnet synchronous motor

For the disassembled stator, rotor and other components of the china permanent magnet synchronous motor, a comprehensive inspection should be carried out carefully. The defects found during the inspection should be recorded item by item for replacement or handling.

1. Check whether there are scratches, cracks, detachment and severe aging phenomena on the insulation of the stator and rotor windings of china permanent magnet synchronous motor; Check whether the binding wires, binding straps, insulating pads and slot wedges at all parts of the motor are loose, broken, fallen off or severely aged. Check whether there are any empty welds or open welds at each weld point. Check whether the fastening screws are loose, slipped, fallen off or have burn marks. Check the mechanical components such as the fan, rotor bracket, spokes and keys for any signs of weld opening, deformation or fracture.

2. Check whether there are burn marks, grooves and concave-convex phenomena on the surface of the collector ring and commutator of china permanent magnet synchronous motor. Check whether the wrap Angle and contact surface of the sliding bearing meet the requirements. Check whether the insulating pad of the seat bearing is in good condition. Check whether the inner and outer sleeves of the rolling bearing are loose. Whether the journal is worn or has pockmarks; Check whether there is any weld opening or fracture in the lifting plate and the head sleeve.

3. Check whether there are any friction marks on the stator and rotor of the china permanent magnet synchronous motor; Check whether there is any oil stain or other debris blocking the ventilation slot holes of the motor.

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