TECHNICAL SUPPORT
Published 2026-03-28
Many friends who are just getting involved in the field of robot production encounter difficulties in choosing aservo. Faced with a wide range of parameters and various models, they are completely confused and confused. In fact, if the steering gear is selected improperly, the consequences will be serious. In mild cases, it will cause the robot's movements to appear stiff and unnatural, and in severe cases, it may even directly burn out the circuit board. In this case, the entire project will have to be torn down and started over.
Today, I will discuss in depth whether robotservos are worth recommending from the perspective of practical applications, and how to choose the one that best suits your needs.
Many friends think that theservois just an ordinary simple motor, but in fact it is a highly integrated servo system. Specifically, the steering gear internally includes the motor, control circuit and position sensor. When you send it a command signal, it can accurately rotate to the specified angle and remain in that position stably. Actions such as the movement of robotic arm joints and the swing of robot legs all rely on servos to achieve precise operations.
Steering gear plays a key role in many fields. In industrial production, robotic arms use servos to achieve various precise grasping and assembly actions; in the field of intelligent robots, the robot's leg swing relies on servos to complete precise posture adjustments, allowing the robot to flexibly walk, run or perform various complex actions. It can be said that the existence of the steering gear provides a strong guarantee for the precise operation of these devices, allowing them to complete various tasks efficiently and accurately.
Ordinary motors will only keep turning, while servos can "turn wherever you point". This is their biggest difference. If you are working on a bionic robot or a project that requires multi-degree-of-freedom control, a servo is basically a necessity. Some novices buy ordinary motors and add encoders to build them themselves in order to save money. As a result, debugging is very troublesome. It is better to just use the servo to save worry.
Let’s first talk about why we recommend everyone to use specialized robot servos instead of ordinary model servos that cost tens of dollars. Professional servos are not at the same level in terms of torque output and response speed. Especially when you need the robot to complete load-bearing walking or fast grabbing actions, ordinary servos can easily shake or even burn out.
More important is the difference in communication protocols. Professional robot servos usually support bus communication, such as serial bus or CAN bus. You can string dozens of servos on one line to control them, and the wiring is extremely simple. On the other hand, ordinary servos require a separate PWM signal line for each one. Making a six-legged robot with optical wiring can make people collapse.
When choosing a servo, you will often see labels related to "metal gear" and "plastic gear". These two have a direct impact on the durability and noise level of the servo. If your robot weighs more than 1 kilogram, or there is a need to grab heavier objects, then metal gears are almost a must-have. For a robotic arm I made before, I initially chose a plastic gear servo for the sake of cheapness. However, the final result was that after only half an hour of continuous operation, the gears began to wear out and were scrapped.
But metal gears are not without their shortcomings. They are much noisier than plastic gears, and they are usually more than 50% more expensive. If you are only making desktop-level small robots, such as mini robot dogs or educational products, plastic gears are enough and can save a budget. The key depends on your load requirements. Don’t blindly pursue metal gears, and don’t save too much.
Many friends come up and ask "What torque is the best steering gear?" In fact, this is a misunderstanding. Torque and speed are like two ends of a seesaw, and you usually can't have both. For example, if you need the robot arm to swing quickly, you have to choose a model with a speed of more than 0.1 seconds/60 degrees, but the torque of this type of steering gear is often not too large.
I recommend first clarifying the main action type of the robot. For a racing robot, speed is the top priority, as long as the torque can overcome its own gravity; while for a handling robot, torque becomes the priority, and a slightly slower speed is not a big deal. If you are really not sure how to determine it, you can estimate it based on the total weight of the robot. The torque required for each motion axis is about 0.5 to 1 times the total weight of the robot, and its unit is kilogram·cm.
These are the two details that novices are most likely to overturn. The size specifications of servos usually include standard size, medium size and small size, and the mounting hole positions and shaft exit positions are different. I have seen many friends buy it only to find that the size of the servo is wrong. Either it cannot fit into the bracket or the torque arm cannot be installed. In the end, they have to reprint the structural parts.
The power supply issue is more critical. The instantaneous current of the high-torque servo may reach 2 to 3 amps. Many people's USB power supply or battery cannot be used at all, causing the servo to restart as soon as the main control board is turned on. It is recommended to use a lithium battery pack for power supply alone. The current output capacity is preferably above 5 amps. Please note that the ground wires of the servo and the main control board must be grounded together, otherwise the signal will be unstable.
When it comes to programming, many people are afraid that servo control will be complicated. In fact, the current servo ecology is already very complete. Whether it is a Raspberry Pi or a Raspberry Pi, there are ready-made library functions to support it. You only need to call a few simple instructions to make the servo move. Like some servos that support bus protocols, you can even use the host computer software to directly debug the angle and speed.
If you are using a smart servo with feedback, you can also read the current angle, temperature and voltage in real time, which is particularly convenient for closed-loop control. It is recommended to give priority to those brands that provide complete development documentation and technical support. There are some cheap no-name servos on Taobao. After buying them, you can’t even find a sample code. You have to explore them all by yourself, which is too time-consuming.
After reading this, do you feel more confident about choosing a servo? Just ask yourself: Is torque, speed, or ease of use most important to me for the project at hand?
Update Time：2026-03-28
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