Servo hub motor, is the motor, encoder, reducer, wheels, tires all integrated into one, both servo motor and walking wheel, because there is no reducer, directly eliminate the noise caused by the reducer, so that the servo hub has low noise, easy installation, cost-effective and other advantages, widely used in service robots, commercial AGV, industrial AGV, AMR and other various needs to use in the walking industry.
The name of the servo hub motor comes from the servo motor, the servo motor can control the speed, position accuracy is very accurate, can convert the voltage signal into torque and speed to drive the control object. The servo hub has the same principle as the servo motor, both belong to the permanent magnet synchronous motor, but the difference is that the servo motor is an internal rotor motor, the servo hub is an external rotor motor, and a high-precision encoder is installed, so that the servo hub has the characteristics of large torque, large inertia, low noise, high precision, etc., and can directly put the corresponding tire on the outer rotor, constituting the servo hub, directly driving the wheel to walk, to replace the original traditional “servo motor + reducer + wheel + tire” program.
In the history of the development of automatic handling, the earliest development of RGV (Rail Guided Vehicle, rail guidance vehicle), the walking scheme adopted is “DC brushless motor / DC brushed motor + reducer + wheel”, because there is no encoder as position information feedback, can only walk on the corresponding guide rail (such as magnetic guide rail, electric guide rail, etc.), obtain the corresponding position information from the guide rail to accurately control the RGV, resulting in RGV can not meet the application of complex terrain, And the need to maintain the guide rail, in today’s society with improved production level and high degree of automation, it is gradually difficult to meet the needs of various manufacturers. AGV (Automated Guided Vehicle, Unmanned Guided Vehicle) manufacturers such as Kiva, Fast Warehouse, and Jizhijia came into being, using two-dimensional code navigation, laser navigation, visual navigation, inertial navigation and other navigation methods, making AGV applicable in various environments and terrains, meeting contemporary industrial applications, but AGV needs to obtain the position accurately in real time during walking, and requires strong overload capacity and small space volume, so most of them use “servo motor +” Reducer + wheels + tires” scheme.
With the development of RGV and AGV, the technology has gradually matured, and commercial service robots have also developed, so at the beginning, service robots also refer to the “servo motor + reducer + wheel + tire” walking scheme in AGV, but face the following problems:
1. AGV is generally used in industry, the noise problem is not obvious, and the service robot directly serves people, and the noise caused by the reducer is criticized by users;
2. The service robot has a small internal space, a low chassis, and a large space occupied by the traditional scheme, which increases the difficulty of structural design and appearance design;
3. The installation between the motor and the reducer, the reducer and the wheel, if the installation is improper, it will cause a series of problems, which will bring a lot of trouble to the installation and production;
4. The life of the reducer is limited, which directly affects the service life of the robot;
5. The “servo motor + reducer + wheel + tire” scheme uses many components, and the cost of servo motor and reducer is high, which brings cost pressure to the service robot.
How to solve the above problems for a hurdle in the hearts of service robot manufacturers, Shenzhen Zhongling Technology has more than ten years of industrial control servo technology, and has rich application experience in service robots and AGVs, has been thinking about how to solve the above customer pain points, inspired by DD motors (direct drive servo motors) in the industrial control industry, if you imitate DD motors, make the motor into an external rotor, install an encoder, put tires on the external rotor, and directly put “servo motor +.” Reducer + wheel + tire” integrated together, whether this scheme is feasible, many times of design and testing, finally made a servo hub, and has been widely used in many service robot manufacturers, with silent, stable operation, high stability and reliability, easy installation, cost-effective and other advantages, for service robot manufacturers to solve the pain points in the heart, promote the development of service robot industry.
Post time: Jul-18-2023