Key Differences Between Servo Drive and VFD

Control Type:

– Servo Drive: adopts closed-loop control system, which can adjust the running status of the motor in real time, and accurately control the position, speed and torque of the motor according to the signals fed back from the encoder and sensors.

– VFD: Adopting open-loop control, controlling the speed of the motor but without real-time feedback mechanism, usually unable to accurately control the position or torque of the motor.

Accuracy and response speed:

– Servo drive: Provides high-precision position and speed control with fast response speed, able to cope with high-speed operation and dynamic load changes.

– VFD: Lower control accuracy, mainly used for simple speed control, applicable to the case of small load changes.

Applicable fields:

– Servo drive: suitable for applications requiring high precision and high response speed, such as robotics, CNC machine tools, laser cutting, automated assembly lines, etc.

– VFD: Suitable for applications that need to regulate speed but do not require high precision, such as fans, pumps, conveyor belt systems, etc.

Cost:

– Servo drives: Servo drives are usually more expensive due to their complexity and high precision control.

– VFD: Usually simpler and less costly, suitable for projects with limited budgets.

Control method:

– Servo drive: real-time adjustment of the motor’s movement through a closed-loop feedback system to ensure high-precision control.

– VFD: open-loop control, only adjust the frequency to control the motor speed.