Common faults and maintenance of speed control motors

During the long-term use of the speed-regulating motor, due to the poor working environment around the environment and the untidy ground, the time is long. Due to the charging and the suction of the armature, the electromagnetic attraction of the motor, etc., the dust and paper are very idle. Metal chips and the like enter the inside of the motor and adhere to the inner hole of the clutch armature and the surface of the magnetic pole rotor. Once the motor repair is too much, it will block the idle space between them, so that the pole rotor and the asynchronous motor rotate at the same speed, and there is a phenomenon that the printing speed is high-speed "flying" and the speed cannot be adjusted. In severe cases, even the motor of the slip motor is controlled by the slip clutch control device. element. Therefore, for the speed-regulating motor slip motor, it should be removed and cleaned regularly every year to avoid the occurrence of such title problems. The following five points of failure often occur in the electrical system of the variable speed motor due to poor maintenance.

1. The main drive motor does not operate normally. The slip motor will vibrate violently during operation, causing the bearing to heat up. Disassemble the clutch armature and the pole rotor to check whether the bearing of the motor is seriously lacking in lubricating grease, causing serious wear of the bearing and degrading the running performance of the motor. At this point, you need to replace the damaged bearing and add grease. Under normal circumstances, all parts of this part of the mechanism should be cleaned and refueled to ensure the normal operation of the main drive motor.

2. The situation occurs when the main engine speed drops periodically. Most of them are caused by the failure of the mechanical part. There are many rubber rollers of the speed regulating motor, and each rubber roller supports the moving bullet by the bearing. If the bearing at any end of a rubber roller fails, the speed of the main engine may be periodically peaked. In severe cases, the host will be more frustrated, and the bearing should be replaced. In addition, it should be noted that the bearing of the main drum (including the printing plate, rubber, impression cylinder) and its lubrication parts are working properly, and if the failure occurs, the printing speed will also be affected.

3. After the speed-adjusting motor speeds up, the machine speed gradually drops and the machine stops. It is necessary to observe the change of the current meter pointer in the electric cabinet of the speed regulating motor. If the indicated current increases sharply, the overload protection device such as the thermal relay of the main motor will inevitably generate a protection action, causing the main motor to disconnect the three-phase power supply and stop the operation. At this time, it is necessary to carefully check the relevant wiring components of the main motor circuit and the AC contactor of the main motor, and whether the wiring parts of the overload protection devices such as all the thermal relays in the electric cabinet of the speed regulating motor are loose, and the contact is bad and the heat is generated. If there is a title in these parts, the current will increase rapidly due to poor contact between the wires and components in the circuit after the main motor increases, causing a protective shutdown. When the running speed of the speed regulating motor is low, the operating current of the main motor is small, and the situation that the gas speed is gradually decreased or stops is not generated. However, when the speed regulating motor is speeded up, the electric load is large, and the electrical components are The fault will be revealed. In actual work, sometimes it can be seen that the terminal block in the electric cabinet of the speed regulating motor is heated due to poor wire contact, even the oxide layer appears at the joint, and the insulation of the wire is anti-burnt and discolored. These title problems will seriously affect the main subject. The normal operation of the drive motor. At this time, the operator should immediately take corresponding measures, such as cleaning the contact surface of the terminal and the wire, tightening the terminal screw, removing the burnt wire oxide layer, and replacing the severely damaged terminal block.

4. The main drive motor runs with a large noise. In order to adjust the dynamic balance of the slip motor, the armature and the magnetic pole rotor are respectively equipped with weight devices. If this part of the device is slightly loose, the slip motor will deviate from the original position when moving at high speed. If the fault occurs in the outer surface of the main drive motor, it will cause local friction between the armature and the pole rotor, which will increase the noise. At this time, it is necessary to stop the repair, restore the dynamic balance of the armature and the pole rotor, and re-find the position of the original balance weight and fix it to make the main drive motor run normally.

5. The main drive motor brake electromagnetic clutch burned must maintain the yoke, armature, friction plate and other parts of the speed brake motor brake clutch, no oil and any debris. It is known that, regardless of any electrical components, if excessive impurities such as paper wool, dust and metal chips are adhered, and the working time is long, the electrical components are heated and the contact is poor, and the impurities in the friction plates increase the clutch. Friction load and damage when not in suction. At this time, the electrical components are not attracted due to poor contact, and the temperature thereof is raised, and the insulation of the brake electromagnetic clutch coil is prematurely damaged, so that it is finally burned. Therefore, special attention should be paid to maintenance. Regularly brush the oil and other impurities on the friction plates and other components with a brush and a gasoline to clean the paper, dust and other impurities on all electrical components in the electrical cabinet of the speed control motor to facilitate the heat dissipation and ventilation of the clutch. Reduce loss, reduce operating temperature and extend the service life of electrical components.

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Label: Common faults and repairs of speed control motors

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