Servo Motor Definition: A servo motor is a motor that controls the operation of mechanical components in a servo system; it is an indirect speed-changing device used as an auxiliary motor. Based on the power supply, servo motors are divided into DC servo motors and AC servo motors. The selection of a servo motor should consider the load mechanism, operating mode, load inertia, positioning accuracy, and operating environment. Servo Motor Classification and Selection Process?
I. Classification of Servo Motors
Servo motor definition: A servo motor is a motor that controls the operation of mechanical components in a servo system. It is an indirect speed-changing device that is an auxiliary motor.
It is divided into DC servo motors and AC servo motors.
The functional differences between them are: AC servos are better because they are controlled by a sine wave and have smaller torque ripple. DC servos use a trapezoidal wave. However, DC servo systems are relatively simpler and cheaper.
At this point, you might think that servo motors have no special features: simply put, servo motors enable precise control. They also feed back as much information as possible to achieve a so-called closed loop. The encoder provides feedback to see if it has actually rotated that much, thus achieving higher control precision.
A typical electric motor rotates when energized and stops when de-energized. Aside from turning, if it has any function, it can be either positive or negative.
II. Providing a servo motor selection process
1. Loading mechanism (determine the mechanism type and its detailed data, such as ball screw length, ball screw diameter, stroke, pulley diameter, etc.)
2. Motion Mode (Determine the motion mode of the controlled object, the relationship between time and speed; convert the motion mode of the controlled object into the motion mode on the motor shaft; determine the operation mode, including parameters such as acceleration time (ta), constant speed time (tu), deceleration time (td), stopping time (ts), cycle time (tc), and distance traveled (L))
3. Positioning accuracy (confirm whether the encoder pulse count meets the system's required resolution)
Servo Motor Classification and Selection Process? Servo motors are driven by brushed DC motors. DC motors are easier to control, smaller, and cheaper than AC motors, and were therefore widely used in the past. However, with the decrease in price and the development of motor control technology, the use of AC motors has become increasingly rare.
