Vacuum | deep low temperature | high temperature | radiation resistance and automation solutions
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2022-11
Warmly congratulate our company through the Sichuan Province "specialized special new" small and medium-sized enterprise identification We will still be down to earth, actively innovate, solve the industry pain points, Become a professional and trustworthy high-tech enterprise in the special automation industry!
22
2022-11
Tech_Note: How to avoid discharge of servo motor in critical vacuum state?
Measure 1: Use low-voltage DC coil servo motor Even if the vacuum chamber passes the above critical state during the process of vacuuming or restoring atmospheric pressure, the servo motor with low voltage DC coil will not appear vacuum discharge. Therefore, for vacuum environment applications, it is recommended to choose low-voltage DC coil servo motor. Kingsley KECM/KSSM series DC coil servo motor power and coil voltage are as follows: 100W: 24VDC, 400W: 24/48VDC 750W: 48VDC Measure 2: The coil of the servo motor is not energized when it is in a critical state When the vacuum chamber is vacuumed or the atmospheric pressure is restored to the critical vacuum state, the servo drive is powered off, or no enable signal is given to the servo drive, so that the servo motor coil is not energized, and the motor vacuum discharge can be avoided. High power (1KW and above) servo motors are usually used with AC coils, and it is recommended to use this measure to avoid vacuum discharge. The power and coil voltage of Kingsley KECM series high power servo motor are as follows: 1KW: single-phase 220VAC 1.8/3.8KW: Three-phase 380VAC (three-phase 220VAC can be customized)
22
2022-11
First, the challenges faced by high and low temperature environment The car will be affected by the harsh external environment and climate for a long time in use, resulting in performance attenuation and failure, affecting the service life of the car. The quality of automotive parts directly determines the quality of the vehicle, so in the new product development stage and production process, many parts need to carry out strict environmental simulation tests to ensure product quality. The simulation test of climate environment usually includes the test items under the conditions of high temperature, low temperature, high and low temperature alternating, wet and hot.
22
2022-11
Tech_Note: Anti-jamming measures of servo drive system
It is a common problem in the debugging of automation equipment that the control command of servo driver is interfered or the servo driver interferes with other equipment. The following measures can effectively avoid signal interference and provide the reliability of the control system. First, choose the appropriate type of control instruction The positioning instructions sent by the upper control system to the servo driver are usually divided into two types: communication instructions and pulse instructions. Pulse instructions are divided into three types according to the output mode: differential, single-ended NPN and single-ended PNP. They are briefly described as follows: 1. Communication instructions With the best anti-interference ability, it is recommended that the servo drive should be controlled by communication command. Common communication interfaces are RS232 ASCII serial port, CANopen, EtherCAT, ProfiNet and so on. ① GaOCang CDHD series servo drivers support RS232 ASCII serial port, CANopen, EtherCAT three communication interfaces. ABB MicroFlex e180/e190 series servo drivers support ProfiNet communication interface. Both servo drives can be used with KECM or KSS series servo motors from Kingsley Technology. 2. Differential output pulse signal Differential signal also has strong anti-interference ability. Most motion control cards can provide a differential output pulse signal.
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2022-11
Whether the stepper motor or servo motor needs to be equipped with brakes
The brake of the stepper motor or servo motor is a safety device, the main function is to provide enough static locking torque for the drive motor shaft in the vertical motion mechanism, to prevent the motor shaft without brake from being in a non-locked free state when the system unexpectedly fails, and the load falls due to gravity. For stepper or servo motors with brakes, the brake must be released when working (generally achieved by connecting 24V power to the brake coil). When the motor does not rotate during power-on, the position of the motor shaft is locked by magnetic force. The motor stops running by the control command, not by the brake to stop the motor. In general, horizontally moving mechanisms do not need to choose a motor with brakes, while vertically moving mechanisms are recommended to use a motor with brakes. The following two vertical motion situations can be considered without brakes, but need to be carefully calculated to fully assess the safety risk: 1, vertically mounted trapezoidal lead screw transmission mechanism, if the lead of the trapezoidal lead screw is small, it can be reliably self-locking, and the motor does not need to have brakes. 2, vertically mounted ball screw transmission mechanism, if the lead of the lead screw is small (such as 2 or 4mm), and the load weight is light (such as 1-2 kg), due to the large friction torque of the ball screw can prevent the load from sliding, the motor does not need to have brakes. KSM's KH series stepper motor and KECM series servo motor can provide braking options. 对于带刹车的步进或伺服电机，工作时必须保证刹车处于释放状态（一般通过给刹车线圈接通24V电源实现）。电机在通电期间不旋转时，电机轴的位置是靠磁场力锁定的。电机停止运转是靠控制指令实现，而不是靠刹车让电机停止运转。 一般来说，水平运动的机构不需要选用带刹车的电机，而垂直运动的机构建议使用带刹车的电机。以下两种垂直运动情形可考虑不带刹车，但需仔细核算，充分评估安全风险： 1，垂直安装的梯形丝杠传动机构，如果梯形丝杠的导程较小，能可靠自锁，电机不需要带刹车。 2，垂直安装的滚珠丝杠传动机构，如果丝杠的导程较小（如2或4mm），且负载重量较轻（如1-2公斤），由于滚珠丝杠的摩擦扭矩较大可防止负载下滑，电机不需要带刹车。 金士力科技的KH系列步进电机、KECM系列伺服电机都可以提供刹车选项。
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2022-11
First, the effect of vacuum, high and low temperature, radiation on the mechanical properties of the motor or moving mechanism 1, high temperature heat dissipation: there is no air convection in the vacuum environment, there is no good heat conduction mechanism, only a small amount of radiation heat dissipation, motor or motion mechanism working due to poor heat dissipation conditions produce extremely high temperature. For example, the motor temperature will reach more than 300 degrees, and the temperature resistance level of the ordinary stepper motor material is generally only 130 degrees. 2, high and low temperature deformation: in extreme high and low temperature environment, such as below 0 ° C, or higher than +50 ° C, the ordinary motor or moving mechanism can not work normally, need to do high and low temperature deformation analysis and special design of the motor and moving mechanism, precision assembly to ensure the smooth and stable work of the moving mechanism, to ensure the operation of the position accuracy. 3, high and low temperature environment material failure: ordinary materials are easy to become brittle at low temperature, easy to become soft at high temperature, and can not work normally in high and low temperature environment. 4, radiation decomposition: the use of ordinary materials of the moving platform in the radiation environment, the structural components will be decomposed, especially the use of ordinary materials will be decomposed to short circuit, operation stuck and other phenomena. 5, vacuum cold welding: in a vacuum environment, if the material in contact with each other is not specially treated, it will be bonded together because of the intermolecular force, which will have a great impact on the moving mechanism. Second, the influence of vacuum, high and low temperature environment on grease 1. In the vacuum environment, the grease used by ordinary motors or motion mechanisms will volatilize and pollute the vacuum environment. For precision equipment such as optical equipment and mass spectrometer working in high vacuum environment, it is necessary to absolutely avoid pollution caused by volatilization of grease. 2, the grease used in ordinary products will solidified at low temperatures and cause the mechanism to jam, and the lubrication effect will fail at high temperatures. 3. Vacuum discharge Some components will discharge in vacuum, and corona discharge is more likely to occur in high vacuum environment. Special materials are needed to avoid vacuum discharge. How do Kingsley's product design and manufacturing processes ensure that products are suitable for these special environments? For vacuum, high temperature, low temperature, radiation environment, our stepper motor, servo motor, linear motion platform, reducer, electric cylinder are using special materials, structural design and lubrication technology to ensure that the product can work properly in these special environments.
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. Second, how to change the stepper motor rotation reverse? After the stepper motor is installed, if the actual rotation direction is opposite to the desired rotation direction, and it is not convenient to change the rotation direction of the motor by modifying the control program, you can change the rotation direction of the motor by switching the wiring sequence of the motor lead A+, A- (or switching B+, B-) and the driver. The three-phase stepper motor can be reversed by switching any two phases in the three phases.
21
2022-11
First, the acceleration setting inside the high Chuang drive is too low, resulting in J1 alarm If the acceleration setting inside the high drive is too low, and the command pulse acceleration of the PLC is too high, the servo motor command deviation is too large, and the servo drive J1 position error exceeds the alarm. Second, the leakage of the drive and servo motor causes the circuit breaker to trip Solution: Ground the driver grounding terminal reliably Third, the third-party servo drive and Siemens PLC Profinet I/O communication 1. ABB's E180 and E190 series servo drives can support Profinet I/O communication with Siemens PLC. The driver comes standard with single-axis motion control and various communication protocols: EtherCAT, PowerLINK, Profinet I/O, Modbus TCP, Ethernet IP. 2, only the Profinet of Siemens servo drive is a full-mode (such as multi-axis linkage, interpolation) control bus, and other third-party servo drives (including ABB) are Profinet I/O communication with Siemens PLC, except for not linkage and interpolation, other functions are the same.
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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)
South China: +8618982051022 Mr. yang (wechat with the same number)
Other areas: +8618224448086 Mr. Wang (WeChat with the same number)
Company Tel: +86028-61932001
Enterprise E-mail: info@kingsni.com
Company Address:No. 588, Wulian 3rd Road, Shuangliu District, Chengdu, China (Sichuan) Free Trade Zone
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Technical Support: China Enterprise Power Chengdu |SEOLabel