Brushless motor use often appeared in the process of its working temperature, even can't work, some of the reasons for electrical heating, Ms today. And combined with the actual findings and guys do a communication.
power causes motor overheating low supply voltage is too high.
when the supply voltage is too high, the counter electromotive force of the motor, the magnetic flux and magnetic flux density increase. Due to the size of iron loss and magnetic flux density is proportional to square of iron losses increase, lead to core overheating. And magnetic flux increasing, and the excitation current component has increased dramatically, due to the stator winding copper loss increase, make the winding overheating. Therefore, when the power supply voltage exceeds the rated voltage of the motor, motor overheating.
low supply voltage is too low.
when the supply voltage is too low, if the electromagnetic torque of the motor remains unchanged, flux will reduce, the rotor current increases accordingly, load power component in stator current increase, cause the winding copper loss increase, cause, rotor winding overheating.
low supply voltage asymmetry.
when the power circuit, a phase will cause single-phase three-phase motor operation, the operation of the two phase winding overheating by high current, so that the motor burned. Is often said that the motor open phase.
low unbalanced three-phase power source.
when unbalanced three-phase power, can make the unbalanced three phase current of the motor, through the don't work in the motor winding zero sequence and negative sequence current, caused by winding overheating.
when motor overheating, adopts the elimination process, should first consider the power of reason.
load problems lead to motor overheating low motor overload running.
when the device does not form a complete set, the motor load power is greater than the rated power of the motor, the motor overload running for a long time (The little horse cart), can lead to overheating.
maintenance motor overheating, should first find out whether the load power and motor power, with the removal of blindness without a purpose.
low drag mechanical load don't work properly.
while supporting equipment, but the mechanical load that drag don't work properly, the runtime loads when small, such as motor supporting thresher, when feeding amount is too large, the electric opportunity fever due to overload.
low drag mechanical failure.
when being dragged the mechanical failure, or stuck, not flexible rotation, will make the motor overload, causing the motor winding overheating.
low motor winding circuit motor itself causes overheating.
when one phase winding break in the motor winding, or parallel branch has a branch circuit, will lead to unbalanced three phase current, overheat the motor.
low when the motor winding short-circuit fault, short-circuit current is much bigger than the normal working current, make winding copper loss increases, cause the winding overheating, even destroyed.
low motor connection errors.
when misconnect into star delta connection motor, if the motor still with full load operation, the current of stator winding more than rated current, and even cause the motor to stop, if the shut down time is a bit long, not to cut off the power supply, winding is not only a serious overheating, will also motor burn down.
when star connection of motor fault connect into a triangle, or several coil string into a branch set of motor fault into two branch in parallel, will overheat the winding and iron core, serious when will burn winding.
low motor wiring process.
when a coil, a coil or a phase windings to reverse, will lead to serious unbalance of three phase current and make the winding overheating.
when the mechanical failure of the motor.
when bad motor shaft bending, assembling, bearing fault, etc, all can make the motor current increases, copper loss and machine loss increase, make the motor overheating.
bad ventilation cooling motor overheating temperature of the low temperature, inlet air temperature is high.
low inlet have sundry block, make the poor into the wind, causing little into the wind.
low motor internal dust too much, affect heat dissipation.
low fan damage or installed backwards, cause there is no wind or air volume is small.
low not installed wind cover or inside the motor end cover not installed wind deflector, causing the motor without the right wind. brushless motor manufacturers
