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Factors causing overheating and burning of motor windings
source：未知 time：2024-09-12 10:21nbsp; click：
1. Motor winding short circuit
When one phase of the motor winding is short circuited, or one of the parallel branches is short circuited, it will cause the three-phase current to be unbalanced, causing the motor to overheat.
2. Motor winding short circuit When the motor winding is short circuited, the short circuit current is much larger than the normal working current, which increases the copper loss of the winding, causing the winding to overheat or even burn out.
2. Motor winding short circuit When the motor winding is short circuited, the short circuit current is much larger than the normal working current, which increases the copper loss of the winding, causing the winding to overheat or even burn out.
3. Incorrect star-delta connection of the motor When a delta-connected motor is mistakenly connected into a star shape, the motor still runs at full load, and the current flowing through the stator winding exceeds the rated current, causing the motor to stop automatically. If the motor stops for a long time and the power is not cut off, the winding will not only overheat severely, but may even burn out. When a star-connected motor is mistakenly connected into a triangle, the winding and the core will overheat and burn out.
4. Incorrect coil connection of the motor When a coil, coil group or one-phase winding is connected in reverse, or the coil branch is wrongly connected, it will cause a serious imbalance in the three-phase current and cause the winding to overheat.
5. Mechanical failure of the motor When the motor shaft is bent, poorly assembled, or the bearings operate poorly, the motor current will increase, copper loss and mechanical friction loss will increase, and the motor will overheat. According to the above doubts, they are eliminated one by one. In terms of power supply, the voltage amplitude, balance and protection function status of the motor input power supply can be further checked and measured. From the observation of the motor winding status, it does not meet the phase failure, and the power phase failure factor is eliminated. In terms of load, the anchor winch is a mature product of Nanjing CSSC Oasis. After repeated demonstration and testing, there is no phenomenon of a small horse pulling a big cart. However, the actual load of the motor during daily use needs to be further understood and eliminated. In terms of the motor, the winding status does not meet the phase failure burnout, and the phase failure factor can be eliminated; at the same time, the medium and low speed windings only have 6 leads, and the Y and △ connections are realized through the external control box, so there is no wiring error, and the control box wiring can be reviewed; there are process differences in the shaping and binding of the motor winding ends. When external factors cause the winding temperature to approach or even exceed the limit, the insulation shows different degrees of aging. The instantaneous short circuit of the winding coil occurs at a certain point of the coil due to power supply harmonics, surge current or coil quality problems. After the motor is powered on, a short circuit is formed between the coils, and the short-circuit point expands, resulting in a large short-circuit current that instantly burns or breaks down the coil at the short-circuit point, while the non-short-circuited coil part remains intact.
low voltage electric motor, Ex motor, Motor manufacturers in China, three phase induction motor, Wolong Nanyang Explosion Protection
4. Incorrect coil connection of the motor When a coil, coil group or one-phase winding is connected in reverse, or the coil branch is wrongly connected, it will cause a serious imbalance in the three-phase current and cause the winding to overheat.
5. Mechanical failure of the motor When the motor shaft is bent, poorly assembled, or the bearings operate poorly, the motor current will increase, copper loss and mechanical friction loss will increase, and the motor will overheat. According to the above doubts, they are eliminated one by one. In terms of power supply, the voltage amplitude, balance and protection function status of the motor input power supply can be further checked and measured. From the observation of the motor winding status, it does not meet the phase failure, and the power phase failure factor is eliminated. In terms of load, the anchor winch is a mature product of Nanjing CSSC Oasis. After repeated demonstration and testing, there is no phenomenon of a small horse pulling a big cart. However, the actual load of the motor during daily use needs to be further understood and eliminated. In terms of the motor, the winding status does not meet the phase failure burnout, and the phase failure factor can be eliminated; at the same time, the medium and low speed windings only have 6 leads, and the Y and △ connections are realized through the external control box, so there is no wiring error, and the control box wiring can be reviewed; there are process differences in the shaping and binding of the motor winding ends. When external factors cause the winding temperature to approach or even exceed the limit, the insulation shows different degrees of aging. The instantaneous short circuit of the winding coil occurs at a certain point of the coil due to power supply harmonics, surge current or coil quality problems. After the motor is powered on, a short circuit is formed between the coils, and the short-circuit point expands, resulting in a large short-circuit current that instantly burns or breaks down the coil at the short-circuit point, while the non-short-circuited coil part remains intact.
low voltage electric motor, Ex motor, Motor manufacturers in China, three phase induction motor, Wolong Nanyang Explosion Protection
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