Vacuum | deep low temperature | high temperature | radiation resistance and automation solutions
21
2022-11
First, about the stepper motor heating 1. Why does the stepper get hot? All kinds of motors we usually see have iron cores and winding coils inside. The winding has resistance, and the power will produce loss, the loss is proportional to the square of the resistance and current, which is what we often say copper loss, if the current is not the standard DC or sine wave, it will also produce harmonic loss; The core has a hysteresis eddy current effect, which will also produce a loss in the alternating magnetic field, and its size is related to the material, current, frequency, and voltage, which is called iron loss. Copper loss and iron loss will be manifested in the form of heat, thus affecting the efficiency of the motor. The stepper motor generally pursues positioning accuracy and torque output, the efficiency is relatively low, the current is generally large, and the harmonic component is high, and the frequency of current alternating also changes with the speed, so the stepper motor is generally heated, and the situation is more serious than the general AC motor. 2, why high and low temperature stepper motor, servo motor heating higher than ordinary motor? The coil material of the high and low temperature motor needs to withstand higher temperatures and have higher insulation strength, so the heat dissipation performance is worse than the coil of the general servo motor, but it will not affect the high temperature performance of the motor. 3, the heating of the stepper motor changes with speed: When the constant current drive technology is used, the current of the stepper motor is maintained constant at static and low speed to maintain constant torque output. When the speed is high to a certain extent, the internal back potential of the motor increases, the current will gradually decrease, and the torque will also decrease. Therefore, the heat caused by copper damage is related to speed. Static and low speed heating is generally high, high speed heating is low. However, the change of iron loss (although the proportion is small) is not entirely true, and the heat of the motor is the sum of the two, so the above is just a general situation. 4, the impact of fever Although the motor heating generally does not affect the life of the motor, most customers do not need to pay attention. However, it can bring some negative effects in severe cases. If the thermal expansion coefficient of each part of the motor is different, the change of structural stress and the small change of the internal air gap will affect the dynamic response of the motor, and the high speed will be easy to lose step. For example, some occasions do not allow excessive heat of the motor, such as medical devices and high-precision test equipment. Therefore, the heating of the motor should be controlled as necessary. 5, how to reduce the heat of the motor: Reducing heat means reducing copper and iron losses. There are two directions to reduce copper loss, reduce resistance and current, which requires that the motor with small resistance and small rated current should be selected as far as possible in the selection of two-phase motors, which can be connected in series without parallel motors. However, this often contradicts the requirements of torque and high speed. For the motor that has been selected, it should make full use of the driver's automatic half-current control function and off-line function, the former automatically reduces the current when the motor is at static, the latter simply cuts off the current. In addition, because the current waveform of the subdivision driver is close to sine, the harmonics are less, and the motor will heat less. There are not many ways to reduce iron loss, and the voltage level is related to it. Although the high-voltage driven motor will bring the improvement of high-speed characteristics, it will also bring the increase of heat. Therefore, the appropriate driving voltage level should be selected, taking into account high-speed, stationary and heat, noise and other indicators.
30
2022-09
KVM series deep cryogenic stepper motor and KLS series deep cryogenic linear motion module are used for automatic storage and retrieval of sample kits in the vapor-phase liquid nitrogen environment freezer.
30
2022-09
Vacuum electron beam welding is a welding method that uses highly concentrated electron flow in vacuum environment to bombard metal joints and fuse them. The heat energy of this welding method is highly concentrated and can prevent the harmful effect of air on the metal.
30
2022-09
Application description: The three-axis cartesian manipulator of electronic components testing and sorting equipment can take and place electronic components for testing and sorting under the guidance of the vision system.
30
2022-09
Perform performance and durability tests on auto parts, cables, electronic devices and other products in high and low temperature environments to verify product reliability and failure models.
30
2022-09
Nuclear waste is extremely radioactive, and its half-life is tens of thousands of years, hundreds of thousands of years, so how to safely and permanently deal with nuclear waste is a major issue facing mankind, which is related to the survival of mankind.
30
2022-09
Organic mass spectrometer plays an important role in compound structure identification, and is one of the four analytical tools for organic structure identification along with infrared, ultraviolet and nuclear magnetic. Mass spectrometry is particularly important because of its high sensitivity, high resolution and fast analysis speed, and usually only a small number of samples are needed to obtain mass spectra for structural identification.
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Chengdu Kingshili Technology Co., Ltd.
East China: +8618224448086 Mr. Wang (WeChat with the same number)
North China: +8618228050282 Mr. Yan (WeChat with the same number)
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Enterprise E-mail: info@kingsni.com
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