On the gantry crane parts motor heat Symptom Cause

  For a variety of motor  gantry crane   the inner core and windings are made composition. Windings resistance, power will produce losses, loss of size and resistance and current proportional to the square, which is what we often say that the copper losses, if the current is not a standard DC or sine wave, but also produce harmonic losses; core with hysteresis eddy current effect, the alternating magnetic field will produce loss, the size of the material, current, frequency and voltage, the called iron loss.
       Copper and iron losses are manifested in the form of heat, thus affecting the efficiency of the motor.  overhead gantry crane  motors are generally pursuing positioning accuracy and torque output, efficiency is relatively low, the current is generally relatively large, and the high harmonic components, the frequency of the alternating current change with the speed, and thus heat conditions prevailing stepper motor, and the situation is more than AC motors generally serious.
       Allow motor heating degree, depending on the  bridge gantry crane  inside the motor insulation class. Internal insulation properties at elevated temperatures (130 degrees) will be destroyed. So long as no more than 130 degrees, the motor will not be damaged, but this time the surface temperature will be 90 degrees or less. Therefore, the stepper motor surface temperature of 70-80 degrees is normal. Useful for simple temperature measurement point thermometer, it can roughly judge: hand can touch more than 1-2 seconds, no more than 60 degrees; hand can touch, about 70-80 degrees; few drops rapidly gas of, the 90 degrees of.
       Gantry crane motor with constant current drive technology, the stepper motor in the static and low-speed, the current will remain relatively constant, in order to maintain constant torque output. High speed to a certain extent, the internal motor back EMF increases, the current will gradually decline, torque will fall. Therefore, heat generation due to copper loss situation brought a speed related. Generally static and low-speed high fever, high speed, low fever. But the iron loss (although a smaller proportion) changes the situation is not always the case, while the motor is heating the entire sum of the two, so these are just general.