Servo motor refers to an engine that controls the operation of mechanical components in a servo system, and is an indirect variable speed device that supplements the motor.
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Servo motor can control speed and position accuracy very accurately, and can convert voltage signals into torque and speed to drive control objects. The rotor speed of a servo motor is controlled by input signals and can react quickly. It is used as an actuator in automatic control systems and has the characteristics of small electromechanical time constant and high linearity. It can convert the received electrical signal into angular displacement or angular velocity output on the motor shaft. So, how to choose a suitable servo motor?
1. Rated power
It determines the amount of energy that the motor can continuously output. Taking CNC machine tools as an example, during high-intensity metal cutting, the motor needs to provide sufficient power to drive the tool to rotate at high speed and cut the metal. If the power selection is too small, the motor may overload and heat up, which not only affects the machining accuracy but may even damage the motor. On the contrary, excessive power can result in resource waste and increased costs.
2. Rated speed
In high-speed sorting equipment on automated production lines, motors are required to quickly drive the conveyor to operate and accurately sort items to different areas. At this point, the rated speed of the motor must match the speed requirements of the production line in order to ensure an efficient production rhythm. If the speed is too low, it cannot meet the production efficiency; Excessive rotational speed may exceed the mechanical capacity of the equipment and cause equipment failure.
3. Torque characteristics
For equipment such as cranes that require lifting heavy objects, the motor must have sufficient starting torque and stable operating torque to smoothly lift and move the heavy objects. If the starting torque is insufficient, the heavy object may not be able to be lifted; Unstable operating torque can cause heavy objects to sway in the air, posing a safety hazard.
4. Controlling precision parameters is equally crucial
In the process of electronic chip manufacturing, the servo motor of the lithography machine needs to accurately control the movement of the worktable. Its position accuracy must reach the nanometer level, and the speed accuracy and torque accuracy must also be extremely high to ensure that the circuit patterns on the chip are accurately etched. Any small deviation may lead to chip scrap.
5. The inertia matching of the motor
The joint movements of industrial robots are frequent and fast. If the inertia of the motor does not match the inertia of the load, it will affect the response speed and motion accuracy of the robot. When the inertia of the motor is too small to drive the load to move quickly and accurately; Excessive inertia can cause the motor to react slowly and make it difficult to implement complex motion commands.
In short, precise grasp of various parameters when selecting servo motors is the key to stable and efficient operation of the equipment. Different application scenarios have different focuses and requirements for these parameters. We must have a deep understanding of the working characteristics and requirements of the equipment, comprehensively consider various parameters, and weigh the pros and cons. Only in this way can the most suitable servo motor be selected to maximize its performance in its respective position.
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Post time:
May-13-
Hello everybody!
I am currently working on a project related to robotics for the robot arm. I use a 13 mm motor for this. To increase the accuracy and determine the position of the finger, I use a conventional potentiometer. It is attached to the finger to determine whether it is open or closed. However, there is a problem: the potentiometer interferes with the movement of the finger. I would like to ask if there are motors that can be used in this case. I am considering motors from Maxon Motor.
Thank you for your attention!
Ok, now I got what you meant, sorry. BTW, I don't know your size requirements, but at the time I knew there were motors with internal encoder. The ones I have seen were all too big for my plastic arm, so I just used some "naked" trimmers (i.e. without that -useless- board) small enough to be fixed in axis with the joint/motor and had no problem at all. I can't tell you more than this.
I found some information:
There are motors with shaft position sensors that can detect the position of the shaft regardless of the switching position. Such motors usually use magnetic or optical sensors to determine the position of the shaft and do not require initial calibration each time they are switched on.
For example, some motors using a Hall sensor or encoder can accurately determine the position of the shaft even after switching off and on again. This is achieved due to the fact that information about the position of the shaft is stored in the memory of the microcontroller or in a special encoder system.
Please help if we can try to find this type of motor on the site:
Are you committed to what you have so far? Servo motors always know where they are and are easy to implement. If the angle limits are too restrictive for your needs, 360 degree rotation servos also exist.
(edited for clarity. I originally said continuous rotation servos but they don't work as simply as typical servos, afaik)
Trimmers are not intended for continued use , the track will quickly wear out .
The arms I’ve seen have fingers operated by pushrods in the arm , that would give you more space .
On a finger , you need a motor with gearbox - difficult to make small .
Have a look what others have done - small servos ?.
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