Do you know how a servo drive drives a servo motor?
Release time:
2023-08-01 17:00
Source:
This article provides answers to "servo small problems" often encountered in network and actual communication, which is very suitable for servo budding new learning, as well as big coffee Wen old knowledge new
We first understand the role of the servo system. On the market we generally putServo motorServo Drives= Servo systemThis system is mainly used to realize the position control, speed control and torque control of the equipment.
☑ Position Control: So that the device can correctly move or stop at a specified position, the higher the accuracy of this position, the better, the current technology can reach within microns.
☑ Speed control: When the target speed changes, the device can quickly respond to the corresponding speed. Even if the load changes, the difference with the target speed can be minimized to ensure stable and efficient operation in a wide speed range.
☑ torque control: When the equipment load changes, the equipment can still operate stably and reliably according to the specified torque.
Then, how to cooperate with the servo drive and servo motor to complete the position, speed and torque control. This requires the inclusion of a brain-level figure in our servo system--Controller.
Its workflow is:
The main function of the servo drive is to convert the command from the controller into a control signal that the motor can recognize. This requires the drive to adopt an appropriate control algorithm that will be issued by the controller.analog signalConvertDigital LetterNo.and then processed by the internal CPU to finally output the target current orPosition signalWait.
Second, servo drives often have sophisticated speed control and overload protection. When the servo motor is working, it is necessary to ensure the precise control of the speed, and the load and inertia of the motor may also cause the sudden increase of large current. Therefore, the servo system needs to pass the internalfeedback mechanismReal-time monitoring of the state of the motor to ensure that the motor work in a safe and stable range.
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This process is like eating. The brain (controller) sends out instructions that I want to eat, and the nervous system (servo drive) receives the instructions and interprets the instructions. The signals that the hands and feet can understand, thus driving the hands to make an impartial action to end the bowl. When the hand is in the process of carrying the bowl, it is found that the bowl is a little heavy, so the information is fed back to the nervous system, and the nervous system reports it to the brain, so that the brain sends another instruction... This way, it is good to ensure that we eat accurately and effectively.
Theoretically, when your encoder resolution, power and other parameters are basically the same, it can be used together.
However, from practical application, we find that there are many factors to consider. For example: communication protocol. General brands will have a custom protocol, want to use it must meet the corresponding communication protocol. There are also the parameters of the three control loops of the motor, the protection method of the motor, such as the brake, the power supply of the brake, etc., all need to be considered.
In addition, it should be noted that the Japanese system and the relevant brands designed with the Japanese system as the reference will have stricter requirements on the suitable third-party motors. On the contrary, the European and American systems will be more open in this respect.
To sum up, it is better to match or not match the servo driver and servo motor according to the manufacturer's sample manual or recommend, which will be more compatible and suitable for your working conditions. Random collocation may greatly reduce the due effect, and even affect the long-term operation and life.
This depends on the motor encoderCommunication Protocol and RateEach brand and different collocation will have different distance requirements, usually in the product manual to explain the distance.
In general, the servo drive and the servo motor are generally maintained15-20 mAround, the use of the effect will be more appropriate. And it is not recommended to transfer the cable in the middle.
If the distance must be longer, it can also take certain measures to achieve. For example, handle the cable shielding, and adopt the necessary anti-interference measures. Servo driver main power input usingIsolation transformer, drive grounding, power cable plus magnetic ring, etc.
Wiring must refer to the user manual,Refer to user manualAnd not sloppy. Once the wiring is wrong, it is likely to cause the servo drive to not work properly, affect the use of servo motors, and seriously affect the normal use of other equipment.
For example, we should refer to the wiring reference diagram, port definition and precautions in the manual.
In addition, no matter which brand of servo drive and the wiring between the servo motor, we need to pay attention:
Detail 01
Each port is guaranteed to be firmly connected. It is best to pull out the wire again after inserting the wire into the port to determine whether the port is firmly connected. This can avoid in operation, due to equipment vibration and the line off the accident.
Detail 02
Use the same sleeve for the main circuit cable, the input and output signal cable and the encoder cable, and do not tie them together. Avoid dangerous situations.
Detail 03
When connecting, also ensure your own safety. Even if the power is turned off, the servo driver may have a residual high-voltage power supply, so do not touch the power terminal when the indicator light is on.
If you have any other questions about servo or motion control, please leave us a message in the background and provide us with a collection of answers from time to time.
Servo, motor, drive, control, speed, equipment, servo drive
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