build refrigerator motor in operation, must be clean. If dust, oil, water drawn into motor internal, they form a short-circuit medium, damage the conductor insulation, short circuit, flow increase. Temperature increase and the burning motor.
2
work under rated load
motor overload movement, the main reason is to drag the load is too large, the voltage is too low, or driven by mechanical binding, etc. When the motor is under a state of overload dynamic, to cause a decline in the speed of the motor, current, temperature, winding coil overheating. If long time overload, motor insulation aging failure and burned at high temperature, it is the main reason for the motor burned.
3
three phase current balance must be
for three-phase asynchronous motor, three phase current, any one phase current and the other of the difference of the average of the two phase current does not allow more than 10%, to ensure normal operation of the motor.
if the current value of single phase and the phase current average amount in excess of the prescribed limit, suggests that the motor has a fault, must find out the reason, can continue to run after troubleshooting, or burned brushless motor accident will happen.
4
keep normal temperature
to check the bearing of the motor, stator, shell temperature in areas such as the presence of abnormal, especially for voltage, current and frequency monitoring equipment and no motor overload protection facilities, particularly the main temperature monitoring.
if found near the bearing temperature rise too high, should immediately stop, check the bearing whether damaged or short of oil. If the bearing damage, should replace new bearing rear can work, if the bearing oil shortage, should add grease, or bearing will further damage leading to collapse, cause the chamber sweep and burning motor.
5
to observe the presence of abnormal vibration and noise and smell
if cold storage building motor vibration, can cause linked to the machines and coaxial degree increased, make the motor load increases, the current increases, temperature rise and burning motor. Motor in operation, therefore, often should check the foundation bolt, the motor end cover, bearing gland is loose, such as connecting device is reliable, and find problems to solve.
noise and odor are a sign of a motor abnormalities, failure, must be ruled out, timely discover and find out the reason or it will delay time, expand the fault, caused serious accident of burning motor.
and
to guarantee the normal work of the starting equipment
starting equipment maintenance mainly clean and tighten. Contactor contact not clean will make contact resistance increases, cause fever burned contact, due to lack of phase and burning motor. Contactor coil of core rust and dust absorption, can make the coil and lax, and gave off a strong noise and increase the coil current, burning coil the cause of failure.
the breath of brushless motor control equipment should be kept in dry, ventilated and location for easy operation, and regularly remove dust, tighten all wiring screws, check if contactor contact contact good, reliable and mechanical parts is sensitive and accurate, and to keep its good technical status, so as to ensure smooth start and not burn out motor.
