How Should The VFD Power Be Selected?

The efficiency of a system is determined by the combined efficiency of a general-purpose inverter and the motor it operates. If both components operate efficiently, the overall system efficiency will be higher. It is important to consider the following factors when selecting the power for a VFD in terms of efficiency.

To maximize the efficiency of VFD operation, it is essential to utilize motor power values that align well with VFD power values. This synchronization allows for optimal performance and improved energy efficiency. By selecting motor power values that are highly suitable for VFD power values, the system can operate with enhanced efficiency and effectiveness. It is crucial to consider this compatibility during the design and implementation of VFD systems to ensure optimal operation and energy savings.

If the power rating of the VFD and the motor are not the same, it is recommended to choose a VFD with a power rating as close as possible to the motor's power rating. However, it's essential to ensure that the VFD's power rating is slightly greater than the motor's power rating to prevent any damage to the motor. It is crucial to maintain this balance to guarantee the best performance from both the VFD and the motor.

To ensure the long-term and safe operation of the motor, it is recommended to use a large variable frequency drive (VFD) in situations where the motor is frequently started, started under heavy load, or has a high frequency of operation. By selecting a large VFD, the motor's start-up process can be better controlled, reducing the chances of damage or inefficiency. This is particularly important when the motor is subjected to frequent start-ups or heavy loads, as these conditions put additional stress on the system. Therefore, opting for a larger VFD can contribute to the reliable and prolonged performance of the motor.

Based on our testing results, it's worth noting that the theoretical power of the motor exceeds what is actually required. Therefore, it's possible to consider selecting a VFD whose power is less than that of the motor. However, it's important to keep an eye on whether there might be a possibility of an overcurrent situation arising as a result of instant peak current, which may subsequently require maintenance attention.

In order to achieve a greater energy-saving effect, it becomes essential to modify the settings of the energy-saving program when there is a disparity between the VFD and motor power. By making necessary adjustments, we can ensure optimal energy efficiency while maintaining the performance of the system. It is crucial to align the VFD and motor power to achieve the desired energy-saving outcomes and maximize operational benefits.