From the electrical point of view of BLDC motor windings burning the cause of the malfunction, and the corresponding treatment.
First, missing running
1 Symptom BLDC motor can not start, even if the load can play a start, slowly increase speed, a hum; BLDC motor smoke fever, accompanied by burning smell.
2 Remove the BLDC motor cover test results can be seen winding end 1 / 3 or 2 / 3 of the pole windings or coke or become dark brown.
3. Failure causes and treatment
(1) motor power supply circuit fuse or a bad circuit by mechanical damage, resulting in a phase fuse blown.
(2) three-phase motor power supply circuit fuse different sizes, small capacity of the fuse. Should be based on the size of motor power, replace the same size fuse.
(3) motor power supply circuit in the switch (isolating switch, plastic lid switch, etc.) and contacts of the contact is bad (burn or loose). Repair and adjust the dynamic and static contact, so that good contact.
(4) lines of a relative phase. Found at the break, and securely connected.
(5) the connection between the motor windings Weld, leading to poor contact. Carefully check the motor windings and weld cable.
Second, the overload
1 speed BLDC motor current exceeds the rating of the motor symptoms; motor temperature exceeds the rated temperature rise.
2 test results BLDC motor winding all three groups burned; bearing frame without grease or sand damage; stator and rotor core with friction, commonly known as sweep chamber.
3. Failure causes and treatment
(1) heavy load, to consider the appropriate load shedding or replacement capacity suitable motor.
(2) The supply voltage is too high or too low, the need to install three-phase power regulator compensation cabinet.
(3) BLDC motor of serious long-term erosion of damp or corrosive gases, insulation resistance. Should be based on specific circumstances, for a major overhaul or replacement of the same capacity, closed with the specifications of the motor.
(4) bearing in oil, dry or rotor mechanical misalignment, leading to sweep rotor chamber, the motor current exceeds the rating. Should first carefully check the bearing wear, and if failed to be replaced with new shaft
Cheng; Second, cleaning bearings and into the amount of grease. Then check the motor cover, cover the center hole if the rotor due to wear and tear resulting in a different heart, should cover the treatment or replacement.
(5) institutional failure of transmission parts, resulting in motor overload and burnout BLDC motor windings. Check the mechanical part of the existing failure to take measures to deal with resolve to make it flexible rotation.
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