Stepper motor stepper motor as a digital performance of the components, widely used in the motion control system. Many users friends in using stepper motor, the feeling machine operation have larger fever, suspicious, I do not know this kind of phenomenon is normal. Fever is actually a common phenomenon of stepper motor, but how the degree of fever is normal, and how to minimize stepper motor fever? Here are some brief analysis. 1, the stepper motor why fever for a variety of stepper motor, the internal is composed of iron core and the windings. Will happen winding resistance, electric loss, the loss is proportional to the square of the intrusive and resistance and current, this is what we call the copper meteorite, if current is not a standard dc or sine wave, harmonic loss will happen; Core has hysteresis eddy current effect, can also occur in the alternating magnetic field loss, the intrusive related to materials, current, frequency, voltage, this is called iron losses. Copper loss and iron loss will be displayed in the form of heat, and then influence the power of the machine. Stepper motor generally seek position precision and torque output, low power, the electric 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, and severe conditions than the general communication motor. 2, stepper motor fever fever allowed to what extent the reasonable range of motor, first depends on the motor internal insulation class. Internal insulation at high temperature (More than 130 degrees)Will be destroyed. Are no more than 130 degrees, so as long as the internal motor will not damage, while the surface temperature under 90 degrees. So, step motor surface temperature in 70 -80 degrees are normal. Brief useful point thermometers, temperature measurement method can roughly judge: be able to touch 1 - by handMore than 2 seconds, do not surpass 60 degrees; Can only touch with the hand, around 70 -80 degrees; Drop a few drops of water gasification quickly, more than 90 degrees. 3, the status of the stepper motor heat change with speed using the constant current drive technology, stepping motor under static and low speed, the current will remain relatively constant, to maintain constant torque output. High speed to a certain extent, the motor internal counter potential, current will gradually decrease, the moment will decline. Therefore, because of the copper loss of heat condition is related to the speed. Generally high fever when static and low speed, high speed low fever. But the iron losses (Although the small percentage)Change the condition of not so much, and motor of the fever is the sum of the two, so the only general situation. Feer is 4, the impact of the motor while generally will not affect the life of the motor, for most customers don't need to ignore. However, severe fever will bring some negative effects. Internal parts such as motor thermal expansion coefficient of different lead to the change of the structure stress and internal air gap of the small change, will affect the motor dynamic echo, high-speed will simply out of step. And as some situation does not allow excessive heating of the motor, such as medical equipment and precision test equipment, etc. So for the motor heating shall carry out the necessary control. 5, how to reduce motor's fever fever, cuts is to cut copper loss and iron loss. Cut copper loss, there are two directions, Yin and cut electricity 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, use series motor is not parallel, 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 active flow control function and offline function, the former voluntary reduction in current when motor is static, the latter may just as well to the current block. In addition, the subdivision driver because current waveform is close to sine, less harmonic, electric heating will be less. Cut iron loss method, voltage grade, with high pressure driven motor while improve the characteristic of high speed, but also brings hot add. So should choose appropriate driving voltage level, both with sex, stability and high fever, such as noise.
