A servomotor is a DC motor with a gear reducer or brake, and an encoder. Unlike a stepper motor, it does not move by means of pulses (although it is controlled that way) but instead applies the principle of a closed-loop control system.
The DC motor spins normally; if it is equipped with a gear reducer, the DC motor has to rotate several times to turn the main shaft. This increases the torque at the expense of speed, but thanks to this, we can achieve more precise control over the system.
The encoder provides position feedback, and through PID control, we can stop it at the exact desired position. Or, in the case of a brake, it is gradually applied as we reach the target position.
Servomotors require a control system, usually called a Driver, which is responsible for sending the signal to move the motor and receiving its feedback. There are different types of Drivers that allow control through PWM, Clock/Dir Up/Down signals, analog and digital signals, or protocols such as Modbus, Ethernet/IP, CanOpen, etc.
If you are looking for a Servo Motor, the engineers at Logicbus can advise you on selecting the right equipment. Contact them at soporte@logicbus.com.
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