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Basic knowledge of inverter servo drive

Dec 11, 2020

Basic knowledge of inverter servo drive

Frequency converter, also called variable frequency drive, usually mainly controls the speed or torque output of the motor.   Nowadays most frequency converters use pulse width modulation or PWM to generate variable output voltage, current and frequency. Here, the diode bridge rectifier takes alternating current (ac) power from the power source and provides intermediate direct current (dc) circuit voltage. In the intermediate DC circuit, the DC voltage passes through a low-pass filter. Then, six high-speed electronic switches in the inverter inverter are controlled to generate short pulses with various widths and heights of the DC bus voltage.   By changing the pulse width, the converter creates an output waveform whose average value is a sinusoidal voltage and current waveform, and the frequency can be changed. This is a variable output used to control motor speed, torque or position.  

In the intermediate DC circuit, the DC voltage passes through a low-pass filter.   is used in modern converters mainly because it is more efficient. The output switch is on or off, does not operate in any intermediate state, and cannot work in any intermediate state that may increase power consumption and energy loss.   Inverter-driven motors are sometimes equipped with position feedback devices. In these cases, the feedback device can improve motor accuracy, dynamic response and torque output at low speeds.  What is the difference between an inverter and a servo drive?  

Frequency converters usually control speed or torque. In contrast, servo drives are usually used to control the position of the motor.

The output switch is on or off. By changing the pulse width, the converter produces an output waveform whose average value is a sinusoidal voltage and current waveform, and its frequency can be changed. It is this variable output that is used to control the motor speed, torque or position.  In some inverter applications, the requirements for motor efficiency are getting higher and higher-so inverters are increasingly controlling permanent magnet motors. Secondly, the performance of the new inverter is better, comparable to servo drives. At last. The emergence of Ethernet-based networks has improved all types of control, including motion and drive control.   Inverters and servo drives have the following characteristics: the motor connected to any kind of inverter converts the electrical energy provided by the inverter into rotation or linear motion. The motor output can be connected to any number of actuators or mechanical machines for work.  Assembly, network processing, processing and packaging industry machines all use inverter types to coordinate work axes and ultimately convert materials into daily products.

How does the inverter communicate with other components? 

 Most modern frequency converters are connected with other components in the control system through a communication network to improve diagnosis and machine control.   In addition, most inverter manufacturers today are shifting from proprietary networks to open networks for servo drives and inverters. For example, Ethernet/IP can connect all equipment, processes and information of the factory (using a network structure) to provide real-time information and control.   In fact, Ethernet-based networks allow more information than ever before to flow from inverters and other intelligent machine components to machine control, and ultimately into factory-level control systems. Better integration of servo drives, inverters and controls also makes configuration and diagnosis easier.  How is the new inverter different from the past design?   Modular (with distributed control) machines are becoming more and more common because they make the design more reliable and reusable.   Here, the inverter (and servo drive) is directly installed on the machine. The mobile control hardware is closer to the application or minimizes the physical footprint of the design on the machine, simplifies connections, and reduces wiring and installation costs by up to 30%.