Why do servo motors come with encoders

Release time:

2023-10-18 10:51

1. Using a separate servo motor is a semi closed-loop control method. The encoder inside the servo motor provides both speed feedback and position feedback;
2. The servo motor comes with an encoder, but does a separate encoder need to be connected to the servo motor? This is a control method between semi closed-loop control and full closed-loop control. The built-in encoder inside the servo motor provides speed feedback, while a separate encoder is connected to the servo motor outside for position feedback;
When using the full closed-loop control method, the encoder inside the servo motor provides speed feedback, and the position feedback uses a grating ruler.

What is the relationship between servo motors and encoders?
1. The servo driver and encoder are two essential components of the servo system. The control part of the servo driver obtains the rotor speed, rotor position, and mechanical position by reading the encoder, which can complete:
A. Speed control of servo motors
B. Torque Control of Servo Motors
C. Mechanical position synchronous tracking (multiple transmission points)
D. Fixed point parking
7. Three major components of the servo system:
Servo motor, encoder, driver. An open-loop servo stepper motor can be used without an encoder
A regular motor and encoder are not equal to a servo motor. As we usually see, a regular motor will still rotate for a while due to its own inertia after power failure, and then stop. And servo motors and stepper motors are quick to stop and go, with extremely fast reactions. However, there is a phenomenon of stepping out of step in the stepper motor.

1、 What is the step angle of a motor?
The angle at which a pulse drives the stepper motor to rotate. For a motor with a step angle of 1.8 °, one revolution requires 360 ° ÷ 1.8 °=200 pulses.
2、 What is drive segmentation?
It refers to dividing the step angle into N equal parts. For example, 8 subdivision is to divide the step angle of 1.8 ° into 8 parts. After subdivision, each step of the motor is 1.8 ° ÷ 8=0.225 °, and one revolution requires 360 ° ÷ 0.225 °=1600 pulses.

What is the working principle of a magnetic ring encoder

“KASEI”SEI-38 absolute value analog encoder

What is the working principle of a magnetic ring encoder

“KASEI”SEI-38 absolute value analog encoder