In order to further improve the quality of the product and reduce the failure, through the analysis and judgment of the rare fault of the motor, find out the thin part of the technology and take necessary measures to ensure the safe operation of the motor.
Vibration vibration should be distinguished by the motor itself or by the poor transmission or by the mechanical load end and then excluded according to the specific situation. The vibration caused by the motor itself is mostly due to poor rotor dynamic balance, poor bearing, bending of the shaft, or different shafts of the end cover, the base, the rotor, or the ground of the motor unit is not flat, the device is not in place, and the fastener is loose. The vibrations generate noise and additional loads can occur.
Noise:
The windshield is ringing. The analysis is considered to have a great relationship with the conformity of the windshield. During the processing, the welding points are rough, the edge of the small flap of the wind deflector is inconsistent, and the assembly often rubs against the end of the rotor.
Electromagnetic sound is divided into high frequency and low frequency. The conformity of the shaft core position is not good, the core is not good, and the rotor outer diameter is inconsistent, which is a factor that can not be ignored. This type of problem is usually eliminated and solved by using a rotor replacement method.
If the motor emits a high and low sound and heavy sound, the reasons may be: 1 the air gap between the stator and the rotor is not uniform, the sound is high and low and the interval between the high and low sounds is constant. This is because the bearing wear makes the stator and the rotor different. Caused by the heart.
The motor will malfunction during operation due to various reasons, and the fault is divided into mechanical and electrical aspects. Mechanical problems such as broom, vibration, bearing overheating, damage, etc. Electrical faults include stator winding phase loss operation, stator winding end-to-end reverse connection, three-phase current imbalance, winding short-circuit and grounding, winding overheating and rotor breakage, open circuit, etc.
The broom base processing and pressing method and processing equipment are the main causes of broom failure. According to the location of the broom, there are mainly the following cases:
1 The broom part occurs at the end of the large iron core of the stator. The analysis is considered to have a direct relationship with the stator lead-in frame: the stator is not guided during the press-in process, causing the stator head punch to be swept by the extruded tab.
2 The position of the broom occurs at the end of the stator or the end of the small head. The position is uncertain and should be related to the concentricity of the base, the end cover and the bearing compliance.
3 Dispersion or sex is directly related to the core stacking quality.
4 The broom caused by the eccentricity of the rotor is relatively rare.
5 The stator slot wedge is ejected obliquely, and the stator slot wedge is higher than the inner circle of the iron core, which is the cause of the broom.
6YZYZR large-size motor stator core and frame positioning distortion caused radial displacement of the stator piece when the stator is pressed into the frame.
There are quality hazards in the 7-seat (the end of the base is lower than the outer edge, and the end or end of the base is not treated in place after repair by the blisters).
8 The stator core itself has hidden dangers (such as tabs and horseshoes) leading to the broom.
The three phase current is unbalanced. This is the reason that the three-phase winding has a wrong grounding, short circuit or poor contact. If the sound is very active, the motor is seriously overloaded or lacks phase operation.
Phase-to-phase short-circuit (1 stator-phase-to-phase short-circuit: short-circuit between the stator-end phase blocks. This phase-to-phase short-circuit is generally caused by the improper size of the phase-to-phase block or the force displacement of the stator during handling. A slight phase-to-phase short circuit can be repaired and a serious Causes the phase to shoot and the stator is scrapped.
The stator lead is short-circuited to the soldered portion of the line, and this phase-to-phase short circuit can generally be repaired. Rotor phase-to-phase short circuit: 1 rotor split soft winding product and hard winding product, hard winding rotor phase-to-phase short circuit condition is very rare, soft winding phase-to-phase short circuit generally occurs at the winding end.
The three-phase current unbalanced motor is caused by the imbalance of the external power supply voltage; the internal cause is mainly the winding turn-to-turn short circuit or the coil turns error or wiring error when the motor heavy winding is repaired. When the cage motor rotor cast aluminum conductor broken strip or the wound motor rotor winding is broken, the stator current is abnormal, and the high-time and low-cycle periodic changes occur, and the noise and vibration are suddenly large and small. The more severe the load, the more pronounced this phenomenon is. China Automotive Bearing Network
The core is loose. When the motor is running, the iron core fixing bolt is loosened due to vibration, and the iron core silicon steel sheet is loosened to emit noise. 4 For bearing noise, it should be monitored frequently during motor operation. The monitoring method is to press the end of the screwdriver against the bearing device and the other end close to the ear to hear the bearing running sound. If the bearing is running normally, its sound is continuous and small rustling sound, there will be no change of high and low and metal friction. If the following sounds appear, it is abnormal.
When the bearing is running, there is a "click" sound. This is the metal friction sound, which is generally caused by the lack of oil in the bearing. The bearing should be disassembled and filled with an appropriate amount of grease.
If there is a “click†sound, this is the sound that is emitted when the ball rotates. Generally, the grease is dry or lacking oil, and it can be filled with an appropriate amount of grease.
If there is a "tick" sound or a "beep" sound, it is the sound generated by the irregular movement of the balls in the bearing. This is caused by the damage of the balls in the bearing or the temporary absence of the motor and the dryness of the grease. 5 uneven collision sound, caused by the fan blade colliding with the fan cover. 6 The noise caused by the rotor rubbing is a limit state of the broom. 7 Insulation paper ringing: Due to the noise caused by improper placement of the stator or rotor slot insulation, it is not easy to find a specific location when handling such faults. 8 Other factors such as partial ejection of the wedge, vibration, and long bolt length of the bearing cap are also local causes of noise.
Short circuit to ground short circuit can be divided into two types: stator to ground and rotor to ground. According to the repair situation, it can be divided into repairable ground and irreparable ground (dead to ground).
Stator to ground: 1 stator lead and the casing occur to the ground, due to the strained lead or the lead wire is broken and damaged during the assembly process.
During the process of pressing the stator into the machine base, the radial or axial displacement of the punching piece breaks the insulation to the ground due to the non-conformity of the end plate, looseness of the punching piece or improper introduction.
When wiring, the connection between the lead wire and the wire is not standardized, resulting in tight space during assembly and grounding with the end cover.
Dead to the ground, the location of this type of fault is not known. 2 rotor to ground: 1 rotor winding to ground. It usually occurs in the slots and slots, mostly due to the large burr of the core and the damage of the slot insulation during cable management.
In other categories, the collector ring retaining ring is generally caused by the structure of the collector ring and the retaining ring itself. This type of fault generally occurs on small-sized motors, carbon brush tails and brush bar seats, and rotor fans. With the windings to the ground.
The no-load current and no-load loss are too large, the outer diameter of the rotor is small, the inside of the car is smashed, the wrong rotor is used, and the iron weight is seriously lacking. These are the causes of such failures. 1 No-load current and no-load loss are large, but the stator winding DC resistance is appropriate. This may be because the core quality does not meet the requirements, the stator and rotor cores are not aligned due to the assembly failure, or the positioning dimensions are not met. 2 The no-load current is large and the no-load loss is normal. This is due to excessive air gap or saturation of the magnetic circuit. If the no-load current is large and the no-load loss is also large, the iron loss of the motor is too large.
The no-load loss is large and the no-load current is unbalanced, indicating that the number of turns of each parallel branch of the winding is not equal, or that a few coils have a partial short circuit.
The no-load current is normal but the no-load loss is large. There are the following reasons: 1 due to improper assembly caused by poor rotor rotation or poor bearing quality, too much grease in the bearing to make the machine consume too much; 2 wrong with a large fan or fan with more blades; 3 silicon steel sheet Poor quality; 4 lack of core length or false stacking results in a lack of effective length.
The inter-turn short circuit of the short-circuit stator in the daytime is mainly due to the poor quality of the silicon steel sheet used now, the quality of the mold, and the unstable quality of the electromagnetic wire. In the case of a stall test, if a heavy paste or burnt smell is found, the insulation may be broken down or the windings may be burnt.
Vibration vibration should be distinguished by the motor itself or by the poor transmission or by the mechanical load end and then excluded according to the specific situation. The vibration caused by the motor itself is mostly due to poor rotor dynamic balance, poor bearing, bending of the shaft, or different shafts of the end cover, the base, the rotor, or the ground of the motor unit is not flat, the device is not in place, and the fastener is loose. The vibrations generate noise and additional loads can occur.
Noise:
The windshield is ringing. The analysis is considered to have a great relationship with the conformity of the windshield. During the processing, the welding points are rough, the edge of the small flap of the wind deflector is inconsistent, and the assembly often rubs against the end of the rotor.
Electromagnetic sound is divided into high frequency and low frequency. The conformity of the shaft core position is not good, the core is not good, and the rotor outer diameter is inconsistent, which is a factor that can not be ignored. This type of problem is usually eliminated and solved by using a rotor replacement method.
If the motor emits a high and low sound and heavy sound, the reasons may be: 1 the air gap between the stator and the rotor is not uniform, the sound is high and low and the interval between the high and low sounds is constant. This is because the bearing wear makes the stator and the rotor different. Caused by the heart.
The motor will malfunction during operation due to various reasons, and the fault is divided into mechanical and electrical aspects. Mechanical problems such as broom, vibration, bearing overheating, damage, etc. Electrical faults include stator winding phase loss operation, stator winding end-to-end reverse connection, three-phase current imbalance, winding short-circuit and grounding, winding overheating and rotor breakage, open circuit, etc.
The broom base processing and pressing method and processing equipment are the main causes of broom failure. According to the location of the broom, there are mainly the following cases:
1 The broom part occurs at the end of the large iron core of the stator. The analysis is considered to have a direct relationship with the stator lead-in frame: the stator is not guided during the press-in process, causing the stator head punch to be swept by the extruded tab.
2 The position of the broom occurs at the end of the stator or the end of the small head. The position is uncertain and should be related to the concentricity of the base, the end cover and the bearing compliance.
3 Dispersion or sex is directly related to the core stacking quality.
4 The broom caused by the eccentricity of the rotor is relatively rare.
5 The stator slot wedge is ejected obliquely, and the stator slot wedge is higher than the inner circle of the iron core, which is the cause of the broom.
6YZYZR large-size motor stator core and frame positioning distortion caused radial displacement of the stator piece when the stator is pressed into the frame.
There are quality hazards in the 7-seat (the end of the base is lower than the outer edge, and the end or end of the base is not treated in place after repair by the blisters).
8 The stator core itself has hidden dangers (such as tabs and horseshoes) leading to the broom.
The three phase current is unbalanced. This is the reason that the three-phase winding has a wrong grounding, short circuit or poor contact. If the sound is very active, the motor is seriously overloaded or lacks phase operation.
Phase-to-phase short-circuit (1 stator-phase-to-phase short-circuit: short-circuit between the stator-end phase blocks. This phase-to-phase short-circuit is generally caused by the improper size of the phase-to-phase block or the force displacement of the stator during handling. A slight phase-to-phase short circuit can be repaired and a serious Causes the phase to shoot and the stator is scrapped.
The stator lead is short-circuited to the soldered portion of the line, and this phase-to-phase short circuit can generally be repaired. Rotor phase-to-phase short circuit: 1 rotor split soft winding product and hard winding product, hard winding rotor phase-to-phase short circuit condition is very rare, soft winding phase-to-phase short circuit generally occurs at the winding end.
The three-phase current unbalanced motor is caused by the imbalance of the external power supply voltage; the internal cause is mainly the winding turn-to-turn short circuit or the coil turns error or wiring error when the motor heavy winding is repaired. When the cage motor rotor cast aluminum conductor broken strip or the wound motor rotor winding is broken, the stator current is abnormal, and the high-time and low-cycle periodic changes occur, and the noise and vibration are suddenly large and small. The more severe the load, the more pronounced this phenomenon is. China Automotive Bearing Network
The core is loose. When the motor is running, the iron core fixing bolt is loosened due to vibration, and the iron core silicon steel sheet is loosened to emit noise. 4 For bearing noise, it should be monitored frequently during motor operation. The monitoring method is to press the end of the screwdriver against the bearing device and the other end close to the ear to hear the bearing running sound. If the bearing is running normally, its sound is continuous and small rustling sound, there will be no change of high and low and metal friction. If the following sounds appear, it is abnormal.
When the bearing is running, there is a "click" sound. This is the metal friction sound, which is generally caused by the lack of oil in the bearing. The bearing should be disassembled and filled with an appropriate amount of grease.
If there is a “click†sound, this is the sound that is emitted when the ball rotates. Generally, the grease is dry or lacking oil, and it can be filled with an appropriate amount of grease.
If there is a "tick" sound or a "beep" sound, it is the sound generated by the irregular movement of the balls in the bearing. This is caused by the damage of the balls in the bearing or the temporary absence of the motor and the dryness of the grease. 5 uneven collision sound, caused by the fan blade colliding with the fan cover. 6 The noise caused by the rotor rubbing is a limit state of the broom. 7 Insulation paper ringing: Due to the noise caused by improper placement of the stator or rotor slot insulation, it is not easy to find a specific location when handling such faults. 8 Other factors such as partial ejection of the wedge, vibration, and long bolt length of the bearing cap are also local causes of noise.
Short circuit to ground short circuit can be divided into two types: stator to ground and rotor to ground. According to the repair situation, it can be divided into repairable ground and irreparable ground (dead to ground).
Stator to ground: 1 stator lead and the casing occur to the ground, due to the strained lead or the lead wire is broken and damaged during the assembly process.
During the process of pressing the stator into the machine base, the radial or axial displacement of the punching piece breaks the insulation to the ground due to the non-conformity of the end plate, looseness of the punching piece or improper introduction.
When wiring, the connection between the lead wire and the wire is not standardized, resulting in tight space during assembly and grounding with the end cover.
Dead to the ground, the location of this type of fault is not known. 2 rotor to ground: 1 rotor winding to ground. It usually occurs in the slots and slots, mostly due to the large burr of the core and the damage of the slot insulation during cable management.
In other categories, the collector ring retaining ring is generally caused by the structure of the collector ring and the retaining ring itself. This type of fault generally occurs on small-sized motors, carbon brush tails and brush bar seats, and rotor fans. With the windings to the ground.
The no-load current and no-load loss are too large, the outer diameter of the rotor is small, the inside of the car is smashed, the wrong rotor is used, and the iron weight is seriously lacking. These are the causes of such failures. 1 No-load current and no-load loss are large, but the stator winding DC resistance is appropriate. This may be because the core quality does not meet the requirements, the stator and rotor cores are not aligned due to the assembly failure, or the positioning dimensions are not met. 2 The no-load current is large and the no-load loss is normal. This is due to excessive air gap or saturation of the magnetic circuit. If the no-load current is large and the no-load loss is also large, the iron loss of the motor is too large.
The no-load loss is large and the no-load current is unbalanced, indicating that the number of turns of each parallel branch of the winding is not equal, or that a few coils have a partial short circuit.
The no-load current is normal but the no-load loss is large. There are the following reasons: 1 due to improper assembly caused by poor rotor rotation or poor bearing quality, too much grease in the bearing to make the machine consume too much; 2 wrong with a large fan or fan with more blades; 3 silicon steel sheet Poor quality; 4 lack of core length or false stacking results in a lack of effective length.
The inter-turn short circuit of the short-circuit stator in the daytime is mainly due to the poor quality of the silicon steel sheet used now, the quality of the mold, and the unstable quality of the electromagnetic wire. In the case of a stall test, if a heavy paste or burnt smell is found, the insulation may be broken down or the windings may be burnt.
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