The general structure of the industrial servomotal system of industrial robots is three closed loop controls, namely the current ring, the speed ring and the position ring. In general, for AC readers, position control, speed control, torque control and other functions can be obtained by manually defining their internal functional parameters.
1. How to properly choose the servomotor and the engine step by step?
Answer: It mainly depends on the specific application situation. And higher control requirements (such as the port interface and communication requirements), the main control method is position, torque or speed. Is the CC or AC food voltage range, or battery, battery. Depending on this, the driver’s engine and the equipped controller are determined.
2. Choose a step -by -step engine or a servomotor system?
Answer: In fact, the type of engine to choose must be determined according to the specific application conditions and each has its own characteristics.
3. How to use the driver of the step by step?
Answer: Depending on the engine current, a driver greater than or equal to this current is equipped. If low vibration or high precision is required, a subdivided driver can be used. For high torque engines, use high -voltage drivers as much as possible to obtain good high -speed performance.
4. What is the difference between the steps step by step in 2 phases and in 5 phases and how to choose?
Answer: The 2 -phase engine has a low cost, but it has a large low -speed vibration and fast torque at high speed. The 5 -phase engine has fewer vibrations and good high -speed performance, which is 30 to 50% higher than the 2 -phase engine, and can replace the servomotor on certain occasions.
5. When to choose a DC Servo system, and what is the difference between computer science and the AC servo?
Answer: DC Servo Motors is divided into brushed and brushed engines.
The brushed engine has a low cost, a simple structure, a large starting torque, a high -speed regulation range, easy control and requires maintenance, but it is easy to maintain (modify carbon brushes), which generates electromagnetic interference and has environmental requirements. Therefore, it can be used in general industrial and civil situations which are sensitive to costs.
The brushless engine has a small size, a light weight, a large outlet, a quick response, high speed, small inertia, smooth rotation and stable torque. Control is complex and easy to carry out information. The engine is maintenance -free, has a high efficiency operating temperature, with very small electromagnetic radiation and has a long lifespan.
AC servocators are also broom free engines, divided into synchronous and asynchronous engines. Large moment of inertia, the maximum speed of rotation is low and decreases quickly as the power increases. Therefore, it is suitable for low -speed and stable operating applications.
6. What should I pay attention when using the engine?
Answer: Before lighting, check as follows:
1) if the power voltage is appropriate (overvoltage can damage the drive module); The controller is appropriate (do not start too much);
2) The control signal wire is firmly connected and it is preferable to consider shielding problems (such as twisted pair wires) in industrial sites;
3) Do not connect all the wires that must be connected at the start and connect them to the most basic system.
4) You must determine the grounding method or use the floating non-connections.
5) Within half an hour of starting operating, you must close the engine condition closely, for example if the movement is normal, the sound and the temperature increase and stop the machine immediately and adjust it if you find problems.
7. When the step -by -step engine starts and works, it sometimes stops moving or moving back and forth when it is in place, and sometimes it loses steps during operation.
Generally, the following aspects must be taken into account for inspection:
1) If the engine torque is large enough and if it can cause the load, we generally recommend that users choose an engine with a torque of 50% to 100% higher than real needs when selecting the model , because step by step engines cannot work overload, even in a moment, causes a loss of steps, the stop in serious cases or irregular movements in place several times.
2) is the current of the input starting impulse of the upper controller sufficiently large (generally> 10 mA) to make the conduction stable of the optocouple, the input frequency is too high, which leads to a Creation, if the output circuit of the upper controller if a CMOS circuit, a CMOS input driver must also be used. WeChat ID technical training is worthy of your attention.
3) Is the start-up frequency too high? Unstable and even in a state of inactivity.
4) When the engine is not well fixed, this situation sometimes occurs, which is normal. Because, in fact, a strong engine resonance is caused at this time and the loss of steps is caused. The engine must be fixed.
5) For a 5 -phase engine, if the phase is poorly connected, the engine cannot work.
8. I want to control the servomotor directly by communication, is it okay?
Yes, it is also relatively practical, but it is only a question of speed and is used for applications that do not require too high response speed. If quick response control parameters are necessary, it is preferable to use a servo motion control card, which generally contains treatment circuits of the DSP logic and at high speed to obtain a high -speed motion control and high precision. Like acceleration S, multi-axis interpolation, etc.
9. Is it good to use a switching power supply to supply step-by-step and continuous current motor systems?
It is generally preferable not to do so, especially for large torque engines, unless you choose a switching diet which is more than double the required power. Since the engine is a large inductance load when it works, it will form a momentary high voltage on the power station. The performance overloading of the switching supply is poor, which will protect the stop, and its precise voltage stabilization performance is not required, which can sometimes damage the power supply and the driver of the supply of switching. A CC diet which can be transformed with conventional toroidal or type R transformers.
10. I want to use a CC voltage of ± 10V or 4 ~ 20 mA to control the step-by-step engine, are you okay?
Yes, but another conversion module is required.
11. There is a servomotor with feedback from the coder.
Yes, an encoder tester signal module at speed is required.
12. Can the part of the servomotor code disc be dismantled?
It is forbidden to dismantle because the quartz sheets in the code plate are subject to rupture, and after entry of the dust, life and precision will not be guaranteed, and professionals must be inspected and repaired.
13. Can the step and the servomotors be dismantled and repaired or modified?
No, it is better to let the manufacturer do it. The performance of magnetic steel materials are damaged and even demagnetization is caused and the engine torque is considerably reduced.
14. Can the SERVO controller change the external load?
If a certain push is encountered, stop, return or keep a certain push.
15. Can drivers or engines produced at the national level be used with high-quality foreign engines or foreign drivers?
In principle, it’s ok, but you must understand the technical parameters of the engine before using it. It is best to consult the supplier before making a decision.
16. Is it sure to drive the engine using a CC supply voltage greater than the nominal voltage value?
Normally, this is not a problem, as long as the engine works in the defined speed and the current limit values. Since the engine speed is proportional to the engine line voltage, the choice of a certain supply voltage will not cause excessive speed, but failures such as conductors can occur.
In addition, it is necessary to ensure that the engine meets the minimum inductance coefficient requirements of the driver, and also to ensure that the defined current limit value is less than or equal to the nominal current of the engine.
In fact, it’s great if you can make the engine slower (below the nominal voltage) in the device you have designed.
Running at a lower voltage (and therefore at a lower speed) will cause a less rebound on the brushes and the wear of the brush / switch is less, a lower current consumption and a longer motor lifespan.
On the other hand, if the limitation of the engine size and the performance requirements require additional torque and speed, an over -deficited engine is also possible, but the life of the product will be sacrificed.
17. How to choose the appropriate power supply for the application?
It is recommended to choose a power voltage value from 10% to 50% greater than the maximum voltage required. This percentage varies according to KT, KE and the voltage drop in the system. The current driver’s value must be sufficient to transmit the energy required for the application. Remember that the driver’s output voltage value is different from the supply voltage, so that the driver’s output current is also different from input current. To determine the appropriate supply current, all the power needs of this application must be calculated and an additional increase of 5% is required. Calculate the formula I = P / V to obtain the required current value.
It is recommended to choose a power voltage value from 10% to 50% greater than the maximum voltage required. This percentage varies according to KT, KE and the voltage drop in the system. The current driver’s value must be sufficient to transmit the energy required for the application. Remember that the driver’s output voltage value is different from the supply voltage, so that the driver’s output current is also different from input current. To determine the appropriate supply current, all the power needs of this application must be calculated and an additional increase of 5% is required. Calculate the formula I = P / V to obtain the required current value.
18. In which direction can I choose for the readers of Servo?
Different modes do not all exist in all disc models
19. How to base the driver and the system?
has. Do not connect the DC bus soil with the non -isolated signal, as this can cause damage to equipment and bodily injuries. Because the common air conditioning tension is not for the earth, there can be high voltage between the DC bus floor and the earth.
b. The soil loops generated in several ways of connecting the earth are sensitive to noise and generate a flow at different reference points.
c. It will also be connected to the soil of the external power supply, which will affect the operation of the controller and the driver (such as the 5V power supply of the encoder).
d. The correct armor floor is at the point of reference potential inside its circuit. This point depends on the landing of the source of noise and the reception at the same time or floating. Make sure that the shielding layer is put to the ground at the same point so that the earth current does not circulate through the shielding layer.
20. Why can’t the reducer be twinned with the engine at the standard torque point?
If the maximum continuous torque generated by the engine through the reducer is taken into account, many reduction reports will be much higher than the reducer level.
If we want to design each reducer to match the complete torque, there will be too many internal speed combinations of the reducer (large volume and more materials).
This will make the price of the product high and violate the principle of the product “High Performance, Small Volume” of the product.
21. How to choose electric cylinders, slide platforms and precision platform products? How is its cost calculated?
The key to choosing an actuator product depends on the requirements you have for movement parameters. Room and do not lift it too much, otherwise the cost can be that of standard products several times. For example, if the accuracy of 0.1 mm is sufficient, do not choose the parameter of 0.01 mm. The same goes for other things such as load capacity, speed, etc.
Another option for users is that if it is not necessary, the three main parameters of the thrust and traction or weight force, the speed and the precision of positioning should not be very demanding at the same time, because The actuator is a high and high precision -high -precision and high -tech mecatronic product, during design and manufacturing, we must consider and select the corresponding components of motors, driving controllers and feedback devices to Starting from various aspects such as mechanical structure, electrical properties, characteristics of materials, materials and treatment methods, as well as guide rails, screws and support of different levels of precision. Of course, we can always meet the needs of high demand products, but the cost will increase accordingly.
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