Stepper motor for a variety of stepper motor, stepper motor inside are composed of iron core and the windings. Winding resistance, electricity will produce loss, the loss is proportional to the square of the size and the resistance and current, this is the copper loss, we often say that if the current is not a standard dc or sine wave, will also produce harmonic loss; Core has hysteresis eddy current effect, also can produce loss in the alternating magnetic field, its size and material, current, frequency, voltage, this is called iron losses. Copper loss and iron loss will be displayed in the form of heat, which affects the efficiency of the machine. Stepper motor general pursuit of position precision and torque output, the efficiency is low, the current is compared commonly big, high harmonic components, the frequency of the alternating current is also change with speed, thus stepping motor are widespread fever, than the general ac motor serious condition. Electric heating allows to what degree? Motor heating of the normal level mainly depends on its internal insulation class. Internal insulation at high temperature (More than 130 degrees)Will be destroyed. So as long as within no more than 130 degrees, the motor will not damage, while the surface temperature under 90 degrees. So, step motor surface temperature in 70 -80 degrees are normal. Simple useful point thermometers, temperature measurement method can also be roughly judge: can touch 1 - by handMore than 2 seconds, no more than 60 degrees; Can only touch with the hand, around 70 -80 degrees; Drop a few drops of water gasification rapidly, more than 90 degrees; , of course, also can be used to detect temperature gun. Some medical equipment and high-precision testing equipment, etc. , need for mechanical fever strict control, so how to control the stepping motor of fever? To reduce fever, is to reduce the copper loss and iron loss. Reduce copper loss, there are two directions, resistance and current, choose as far as possible when this request in the selection of small resistance and the rated current of the motor, the two-phase motor, motor without parallel in tandem. But this often conflict with the moment and the requirement of high speed. For motor has been selected, should make full use of the drive of automatic flow control function and offline function, the former in stepper motor, automatically reduce the static current, which the current cut off altogether. In addition, the subdivision driver due to close to sinusoidal current waveform, harmonic, stepper motor heating will be less. Reduce iron loss method, related voltage level, although high voltage driving of stepping motor will bring high speed characteristics, but also brings the increase of the heat. So should choose appropriate stepper motor drive voltage grade, recommend suite, give attention to two or morethings stationarity and fever, indicators such as noise.
