An AC (Alternating Current) Drive is a useful tool that controls how fast an electric motor runs.
Here's what it can do:
Better Control: AC drives can adjust the speed of motors, making different tasks easier to manage.
Saves Energy: By controlling the motor's speed, AC drive systems can use less power. This can save money and is better for the environment.
Less Stress: Changing the motor's speed can help reduce wear and extend it’s life expectancy.
Works Better: With an AC drive, machines using electric motors can work more effectively.
But that's not all. AC drives also play a big part in green energy. They can turn energy from natural things like sun, wind, or sea waves into electricity. This can then be used locally or added to the main power grid.
In the world of hybrid technology, AC drives mix regular power sources with energy storage to manage power usage better.
AC drives have many names. They are sometimes called adjustable speed drives, adjustable frequency drives, variable frequency drives (vfd), variable speed drives, frequency converters, inverters, and power converters. But, they all mean the same thing - AC drive.
Let’s take a look how ABB explains what AC drives are and how they work
AC drives work by adjusting the speed and torque of an electric motor by varying the motor's input frequency and voltage. Here's a simple explanation of how this happens:
Power Conversion: AC drives work on the principle of converting alternating current (AC) into direct current (DC), then back into AC.
DC Link: The converted DC power is then smoothed out in the 'DC link' section of the drive. It acts like a kind of energy storage.
Inverter Stage: The smoothed DC power then goes to the inverter stage. This is where it gets changed back to AC. But now, the drive can control how much power goes out and how fast it changes - this is the 'frequency'.
Motor Control: The output from the drive (the adjusted AC power) is sent to the motor. The amount of power and the speed of change (frequency) determine the speed and torque of the motor. The drive can adjust these to exactly match what's needed.
In this way, AC drives allow precise control of motor speed and torque, which can lead to energy savings and better performance of the motor-driven equipment.
Is an AC Drive Same as VFD?
AC Drive and VFD are frequently used synonymously. Nevertheless, a VFD is a form of AC drive. As stated previously, a VFD regulates the speed of an AC motor by altering the frequency and voltage of the motor's power supply.
Types of AC Drives
AC drives are tailored to work with different kinds of AC motors. They come in various types, each offering unique features:
Induction Drives: Working with induction motors, these drives are adaptable and provide powerful, variable speed control. However, they might not always keep up with the exact speed.
Synchronous Drives: These work best with synchronous motors, known for maintaining a consistent speed. If you need precise speed control, these are your best bet.
Volts per Hertz (V/Hz) Drives: These drives are simple but effective. They keep a steady voltage-to-frequency ratio, which is perfect for tasks that don't have much load variation.
Sensorless Vector Drives: These drives take control to the next level. They adjust quickly to changes and can produce stronger torque at slower speeds compared to V/Hz drives.
Closed Loop Vector Drives: For more demanding tasks that need specific speed and torque control, these drives are ideal. They use a feedback system, typically an encoder, to adjust the motor's operation.
Direct Torque Control (DTC) Drives: These are advanced AC drives developed by ABB. They control motor speed, torque, and position very accurately without needing encoders for feedback.
Servo Drives: Working with servo motors, these drives are known for fast acceleration and precise control. They often use feedback from Hall Effect sensors.
Remember, every type of AC drive has its strengths. Your choice should align with the requirements of your specific task.At Proax, we're here to help you navigate these options. We can assist you in selecting the perfect AC drive for your specific application.
Types of ABB AC Drives and Their Benefits
ACC355: Our top-of-the-line micro drive, the ACS355, is optimally designed for applications in material handling, the food and beverage industry, as well as the processing of rubber, plastic, and wood. This versatile drive stands out for its affordability, superior connectivity options, and user-friendly design. The easy installation and commissioning process further contribute to its appeal by reducing labor time.
Highlights
- 0.37 to 22 kW/0.5 to 30 HP
- Design optimized for cabinet space & install time
- Various fieldbus adapters for connectivity
- Vector control for asynchronous & permanent magnet motors
- Simple, visual, independent programming sequences
- Predefined macros for quick configuration
- Unified IP20 product dimensions simplify installations
ACS550: The ACS550 offers a streamlined, intelligent solution for both variable and constant torque applications, including pumps, fans, conveyors, and mixers. Its simplicity guarantees a plug and play experience without the need for specialized engineering.
- Power range: 0.75 to 355 kW/1 to 500 HP
- Counters for tracking energy savings, CO2, or currency
- Includes vector control technology
- Embedded EMC filter & Modbus interface
- Swinging choke for harmonic reduction
- Coated boards for harsh environments
ACS800: When looking for a industrial drive designed for your applications, OEM or system integrator the ACS800 single drive series are available as AC drives and modules. These ABB industrial drives can be installed without a cabinet, are available as wall mounted, freestanding or cabinet built construction.
- Power range: 0.55 to 5600 kW
- IP21 - IP55
- No need to install input chokes or EMC filter
- Brake chopper built-in in all frame sizes (standard/optional).
- Easy and fast commissioning and operation.
ACS880: The ACS880 single drives provide industries with adaptable and customizable solutions. Available in wall-mounted or cabinet-built configurations, they can accommodate a variety of applications, including mining, oil and gas, chemical processing, and power generation. These drives utilize ABB's standardized architecture to provide precise control for various applications, including cranes, conveyors, compressors, and fans.
- Power/voltage range: 0.55 to 6000 kW, 230 to 690 V
- Enclosures: IP00, IP20, IP21, IP42, IP54, IP55
- Direct torque control (DTC) for precision
- Built-in safety & simplified configuration
- Compatible with major automation networks
- Removable memory for easy commissioning/replacement
- Energy optimization & efficiency monitoring
- Easily serviceable design
ABB AC Drives Principles
ABB AC drives operate on the same fundamental principles as those described above but have the following distinguishing characteristics:
● ABB's AC drives can adapt to various loads, allowing optimal energy consumption. They can handle various motor types, including induction, synchronous, and permanent magnet motors.
● Control Panel that is intuitive: ABB AC drives feature a Control Panel that is clear and intuitive, making it simple for operators to control, monitor, and optimize their operations.
● Intelligent Connectivity: ABB AC drives are compatible with digital networks via fieldbus adapters such as Ethernet/IP and Ethernet adapters, allowing remote monitoring and control.
● Some ABB AC drives include direct torque control (DTC) for precise control without feedback, safety functions, and a variety of motor control algorithms for energy optimization.
● Customizable: The software in the AC drive can be tailored to operational requirements, allowing for greater flexibility in its application.
● AC drives from ABB are designed to be durable, compact, and user-friendly. They can handle challenging power conditions and come compact for simple installation and maintenance.
At Proax, we're committed to helping you make the most of your operations through advanced, energy-saving technologies like AC drives. Our team of experts is always on hand to guide you through the process of choosing and implementing the best solution for your applications. Contact us now
