Servo motors can be divided into dc servo motors and ac servo motors. The next i will introduce its advantages and disadvantages.
DC servo motor
The DC servo motor is divided into a brushless and brushless motor. The brush motor has low cost, simple structure, large starting torque, wide speed range and easy control. The brushless motor is small in size, light in weight, large in output, fast in response, high in speed, small in inertia, smooth in rotation and stable in torque.
Disadvantages: Maintenance is required, but maintenance is inconvenient (replacement of carbon brushes), electromagnetic interference will occur, and has strict with the environment.
AC servo motor
Advantages: AC servo motor has good speed control characteristics, smooth control in the entire speed range, almost no oscillation, high efficiency, low heat generation, high speed control, high precision position control (depending on encoder accuracy). Constant torque, low inertia, low noise, no brush wear and maintenance-free (suitable for dust-free and explosive environments) can be realized in the rated operating area. AC servo motor is also a brushless motor, which is divided into synchronous and asynchronous motors. At present, synchronous motors are generally used in motion control, so its power range is large, the power is very large, the large inertia, the highest speed is low,suitable for low speed and smooth operation.
Disadvantages: The control is more complicated, the driver parameters need to be adjusted on-site to determine the PID parameters, and more connections are needed to support its operation.