Seafood double chamber vacuum packing machine stator winding grounding

The stator winding of seafood double chamber vacuum packing machine is grounded; The winding grounding of vacuum packing machine, air-controlled vacuum packing machine and automatic vacuum packing electromechanical machine means that the winding insulation of the motor is damaged and the coil wire touches the core or casing of the machine.

1. Stator winding grounding of seafood double-chamber vacuum packaging machine; Stator winding grounding of packaging machine. If the casing of the mechanical motor is not reliably grounded, it will cause electrification and harm to the body. If the motor is reliably grounded, the fuse will be broken. After grounding the winding, the number of turns of the winding decreases, the current increases, the winding becomes seriously hot, burns out the insulation layer, and sometimes is accompanied with abnormal noise and vibration. Serious grounding of the winding may lead to a short circuit of the winding, making the motor unable to work.

2. Stator winding grounding of seafood double-chamber vacuum packaging machine; Reason for grounding stator winding of vacuum packing machine. Due to improper wire embedding process, the insulation material at the bottom of the slot is crushed, the insulation layer at the slot is closed poorly, and the insulation layer at the slot is damaged, which will cause the winding grounding. Sometimes the motor runs under load for a long time, which causes the insulation material to age and become brittle. The wire is loose, the silicon steel sheet is not pressed, there is burr and other reasons, in the case of vibration will scratch the insulation material; Stator and rotor phase friction, so that the core overheating, burned slot wedge and slot insulation will cause the motor winding grounding.

3. Stator winding grounding of seafood double-chamber vacuum packaging machine; Stator winding fault diagnosis of vacuum packing machine. The following methods can be used to diagnose stator winding grounding fault.

(1) seafood two-chamber vacuum packaging machine stator winding grounding; Direct observation. The ground fault of automatic packaging electromechanical motor winding usually occurs near the core notch, and the connection is often broken and scorched with insulation materials. So it can sometimes be observed by observation.

(2) seafood two-chamber vacuum packaging machine stator winding grounding; Test lamp method. When the site damage is not serious and not easy to be found, the test lamp method can be used to check. A high-power bulb can be used to connect two test rods to the winding and shell through the wire respectively, and provide low-voltage dc 24V alternating current to the test bulb. If the bulb is dark red or not bright, it means that the phase winding is well insulated. If the bulb shines or shines, the phase insulation is grounded.

(3) seafood double chamber vacuum packaging machine stator winding grounding; Elimination inspection. If the above two methods can not find the connection point, it is necessary to open the stator windings of the automatic vacuum packaging machine for group elimination inspection. First, find out the grounded phase, disconnect the line between the phase and each phase group, find out the grounded phase group by group with insulation resistance meter or test lamp, and then find the coil with grounding fault in the same way.

(4) seafood double chamber vacuum packaging machine stator winding grounding; Voltage measurement. Apply moderate dc to alternating current on the faulty one-phase winding. If ac power is used, the power connected to the automatic vacuum packing electromechanical motor must be ungrounded through the isolation transformer, and the motor rotor must be pulled out of the stator. At this time, the voltage U and the voltage U1 and U2 from both ends of the winding to the core are read out. If the winding is fully grounded U=1+2, the approximate position of coil grounding can be obtained from the proportional relationship between U1 and U2.

(5) seafood double-chamber vacuum packaging machine stator winding grounding; Current orientation. Connect the two ends of the faulty winding together to one end of the dc power supply, and the other end of the dc power supply to the core of the motor. At this time, a magnetic needle is placed on the top of the slot, and the slot number can be determined by changing the pointing position of the magnetic needle. The position of the receiving point can be roughly determined by moving the magnetic needle back and forth along the direction of the slot in the fault slot number.

6 seafood two-chamber vacuum packaging machine stator winding grounding; Smoking method. If there is no such inspection conditions, can be in the ground phase winding, the application of alternating current, the power supply to apply a higher voltage (such as 220V) series of a larger power bulb to carry out the inspection; Conditional also can use high voltage test transformer to check, raise the voltage to 500-100v, at this time the ground point may smoke or spark, can find the ground point but the slot ground with this method is not easy to find.

4. Stator winding grounding of seafood double-chamber vacuum packaging machine; Troubleshooting. When removing the grounding fault, the damage of the winding should be carefully observed. In addition to the winding grounding fault caused by aging insulation and reduction of mechanical strength, the winding should be replaced.

(1) seafood two-chamber vacuum packaging machine stator winding grounding; The slot is grounded. If find out ground circle the exit slit or groove in the bottom line, and only a wire insulation layer is damaged, can put the heating coil to make the insulation around 130 c soft after use crossed plate or the ferule pry open ground slot insulation, clean up the joint is located in the charred insulation, insert the appropriate size of the new insulation board, insulation resistance meter measuring insulation resistance. After the insulation performance of the winding is restored, apply self-drying insulation varnish to the repair place while it is hot. If there are two or more conductor insulation layer damages at the junction, the groove insulation and conductor insulation can be repaired at the same time to avoid short-circuit between turns.

(2) seafood two-chamber vacuum packaging machine stator winding grounding; The upper side groove of the double-layer winding is grounded internally. After heating the winding to about 130°C to soften the insulation layer, lay down the slot wedge on the grounding coil, and then lift the notch on the upper side of the grounding coil to clean the damaged slot insulation, and pad the damaged slot insulation with new insulation board. At the same time, check whether there is any damage of the insulation layer between turns at the junction, then insert the upper edge into the groove, convert the insulation of the groove, drive into the groove wedge and make good insulation treatment. Before and after driving into the groove wedge, apply the insulation resistance meter to measure the insulation resistance of the fault coil to restore the insulation resistance to normal.

The stator winding of seafood double chamber vacuum packing machine is grounded; For the ground breakdown in the lower side groove of the double-layer winding, the local wire changing method and threading repair method can be used.

(3) seafood double chamber vacuum packaging machine stator winding grounding; If the wiring point is near the end of the notch, and the damage is not serious, should be between the wire and the core pad insulation, paint brush insulation varnish can be.

(4) seafood double chamber vacuum packaging machine stator winding grounding; If the receiving point is in the slot, the slot wedge can be extracted gently, and the turns can be taken out one by one with the marking plate until the faulty conductor is taken out. The insulation damage can be wrapped with insulation tape, and then the conductor can be carefully embedded back into the slot.

(5) seafood double-chamber vacuum packaging machine stator winding grounding; If the winding is affected with damp, the whole winding should be pre-dried, then coated with insulating varnish and dried.

6 seafood two-chamber vacuum packaging machine stator winding grounding; If the core bulges and cuts the insulation layer, the protruding silicon steel sheet should be knocked down and the insulation should be re-wrapped in the broken part.