- Power rating 0.75 - 25,000 kW
- Voltage range 230V - 11 kV (up to 13.8kV on request)
A Variable Speed Drive (VSD), also known as a Variable Frequency Drive (VFD) or Adjustable Frequency Drive (AFD), is an electronic device used to control the speed and torque of an electric motor by varying the frequency and voltage supplied to the motor. Unlike traditional fixed-speed motor control methods, such as direct-on-line starters or soft starters, VSDs offer precise control over motor speed, acceleration, and deceleration, leading to significant energy savings, improved process control, and reduced wear and tear on equipment.
At the heart of a VSD is an inverter, which converts incoming AC power into DC power through rectification and then converts it back into variable-frequency AC power through pulse-width modulation (PWM) techniques. By adjusting the frequency and voltage of the output power, the VSD regulates the rotational speed of the motor, allowing it to operate at different speeds as required by the application.
One of the key features of VSDs is their ability to provide soft starting and stopping of motors, which reduces mechanical stress and eliminates the need for additional components like starters or brakes. This results in smoother operation and longer equipment lifespan.
VSDs are widely used in various industries and applications, including HVAC systems, pumps, fans, conveyors, compressors, and machine tools. They offer precise control over motor speed and torque, allowing users to optimize energy consumption and process efficiency. Additionally, VSDs can enable advanced control strategies such as closed-loop feedback systems, where motor speed is adjusted based on external sensors or feedback signals, further enhancing system performance and responsiveness. Overall, VSDs play a crucial role in modern industrial automation by providing flexible and efficient motor control solutions.
