The electric motor is a key device in production equipment that converts electrical energy into mechanical energy. Its performance and quality directly affect the production and safety of the mine. So what maintenance and management methods should be used for electric motors? The following are the electric motor repair and management methods compiled by the editor of SenseView. I hope it can help you.
Measures for the management of motor repairs 1. Each user unit must manage and make good use of the current AC and DC motors, and perform regular maintenance and repairs. If problems are found, they must be dealt with in a timely manner. Units that have damaged motors must Carry out accident analysis to identify responsibilities and deal with them according to the circumstances.
2. Motor repairs belong to the Mechanical and Electrical Department. The repairs by the Mechanical and Electrical Team are divided into two parts:
1. AC motors, DC motors, and stators are repaired by the Mechanical and Electrical Workshop:
(1) Principle of repair: Those who can repair by themselves must repair by themselves and do not go out to repair;
(2) All disassembly and repair of motors must be inspected by the Electrical and Mechanical Department;
(3) ) The principle of overhauling the stator coil of the motor is to interpolate the coils that can be interpolated after inspection. Anyone who finds that they can be interpolated and dismantles them without permission will be fined 100-200 yuan;
(4) When overhauling the stator, the The process is in charge of the electromechanical team, and the quality is controlled by the electromechanical department. If there is a shortage of stator parts, those who can make them must be made as much as possible. Those that need to be processed outside must be approved by the supervisor and the electromechanical department will be responsible. If the old wires are removed, all motors that are dismantled and repaired will be repaired. Burning with fire is not allowed. Special circumstances will be decided by the Electrical and Mechanical Department.
(5) If the mine completes the monthly overhaul plan for the electromechanical workshop, the overhaul personnel can be appropriately rewarded.
(6) The quality of materials used for overhauling electric motors is strictly controlled by the Mechanical and Electrical Department and the Enterprise Management Department.
2. Repair of DC motor rotors: fixed-point contracting, and the materials used for repairs are paid by individuals. The mine will determine the overhaul cost of each unit based on its repair status, quality, and opinions after use. The specific work will be carried out by the Enterprise Management Department , the Mechanical and Electrical Department is responsible.
(1) The materials used for overhauling the rotor must have the manufacturer's name brand, quality appraisal certificate, certificate of conformity, and special materials with calibrated withstand voltage values.
(2) After each operation of the DC motor is damaged, the electromechanical team, electromechanical department, business management department, and transportation team must jointly analyze the accident to find out the cause. If it is a repair problem, study the punishment opinions. If the problem is related to use or maintenance, the user and maintenance unit will be punished, and then the specific content of the next overhaul of the motor will be determined.
(3) If there is a problem with the motor rotor during the service period, the Mechanical and Electrical Department, the Mechanical and Electrical Team, and the Enterprise Management Department will jointly hold an accident analysis meeting to study and formulate punishment opinions.
(4) When the motor rotor is pulled out of the workshop, formalities must be completed by the Enterprise Management Department and the Mechanical and Electrical Department, and the overhaul opinions of the joint investigation team must be attached. Otherwise, the electrical repair team of the Mechanical and Electrical Team will not allow anyone to pull it out. If there is a problem, The electromechanical team is responsible. After the motor rotor is repaired and transported back to the workshop, it must go through the delivery procedures and pay for the repair content. Otherwise, the electromechanical team will not accept it. The number of units for each overhaul must be reported to the supervisor. The overhaul is only allowed after approval by the mine research. The department must have a ledger and be subject to supervision and inspection.
The working principle of the motor: The DC motor adopts an octagonal full-laminated structure, which not only has high space utilization, but also can withstand pulsating current and rapid load current changes when powered by a static rectifier. DC motors generally do not have series windings and are suitable for automatic control technology that requires forward and reverse rotation. It can also be made with series winding according to user needs.
The working principle of a DC motor:
In the picture, the coil is connected to the commutator piece, which is fixed on the rotating shaft and rotates with the motor shaft. The commutator segments and the rotating shaft are all insulated from each other, and the whole they form is called a commutator. Brushes A and B are fixed in space.
Add DC voltage to the two brush ends of the motor. Due to the action of the brushes and commutator, electric energy is introduced into the armature coil, and it is ensured that the current in the coil side under the same pole is always One direction, which in turn ensures that the direction of the electromagnetic force on the side of the coil under the pole remains unchanged, ensuring that the motor can rotate continuously. When the conductor cuts the magnetic lines of force in the magnetic field, an induced current is generated in the conductor. The combination of the induced current and the magnetic field The function applies driving force to the motor rotor to convert electrical energy into mechanical energy to drive the production machinery. This is the working principle of the DC motor. Note: The direction of current flow in each coil side is alternating.
Methods for selecting servo motors 1. The maximum speed of the motor. Motor selection is first based on the rapid travel speed of driven components such as machine tools.
The speed of the fast-traveling motor should be strictly controlled within the rated speed of the motor.
2. Principle of moment of inertia matching. Load inertia has a great influence on the control characteristics of the motor and the acceleration/deceleration time of rapid movement. When the load inertia increases, the time between the computer issuing an instruction and the servo motor completing execution becomes longer. That is, after the instruction changes, it takes a longer time to reach the speed specified by the new instruction. If the machine tool moves at high speed along two axes to process curves such as arcs, it will cause large processing errors. If the load inertia is more than 3 times that of the motor, the control characteristics of the motor will be reduced. If it is more than 5 times, the controllability of the motor will be greatly reduced; conversely, if the load inertia is less than or equal to the inertia of the motor, it will not occur. the above issues. To ensure the system's response sensitivity and meet the system's stability requirements, the load inertia JL should be limited to 2.5 to 5 times the motor inertia JM.
3. No-load torque. When machine tools and other equipment are running without load, the torque applied to the motor should be less than 50% of the continuous rated torque of the motor. Otherwise, the motor may overheat during cutting or acceleration/deceleration.
4. Load torque. Under normal operating conditions, the load torque Tms does not exceed 80% to 90% of the motor's rated torque TMS.
Guess you are interested in:
1. What are the common faults and troubleshooting methods of electric vehicles
2. What are the knowledge and skills of electric vehicle repair
p>
3. How to repair electric vehicles
4. What are the tips for repairing electric vehicle circuits
5. What are the repair methods for electric vehicle motors