A common cause of severe motor heating.
7. Almost half of the motors burned out due to the lack of phase operation of the motor.
The lack of phase often causes the motor to be inoperable or the speed is slow after starting, or the rotating forceless current increases the "click" sound. If the load on the shaft does not change, the motor is in a severe overload state and the stator current will reach 2 times or more of the rated value. The motor will heat up or burn out in a short time. The main reasons for the lack of phase operation are as follows:
A phase failure occurs on the power line due to other equipment failures, and other three-phase equipment connected to the line will run out of phase.
One phase of the circuit breaker or contactor is phase-depleted due to partial voltage burnout or poor contact.
The phase loss of the motor access line due to aging, wear and the like.
The one-phase winding of the motor is broken, or the one-phase connector in the junction box is loose.
8, other non-mechanical electrical failure causes
Other motor failures caused by non-mechanical electrical faults may cause motor failure in severe cases. If the ambient temperature is high, the motor lacks a fan, the fan is incomplete, or the fan cover is missing. In this case, cooling must be forced to ensure ventilation or replacement of blades, otherwise the normal operation of the motor cannot be guaranteed.
In summary, in order to use the correct method for motor fault handling, it is necessary to be familiar with the characteristics and causes of common faults of the motor, seize the key factors, and regularly check and maintain. In this way, it is possible to take fewer detours, save time, eliminate faults as soon as possible, and make the motor in normal operation. Thereby ensuring the normal production of the workshop.
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