Motor Control Using Frequency Converters – "Pros" and "Cons"
Before purchasing expensive devices, economical consumers often consider the possibility of more affordable alternatives. This applies to the choice of frequency converters with vector control.
An alternative to vector frequency converters is scalar converters. Before making a choice, it's worth weighing the advantages and disadvantages of both types.
Advantages of Vector Converters
- Vector converters are capable of performing all functions that are supported by scalar converters.
- They enhance speed regulation and significantly accelerate most processes in three-phase motors.
Advantages of Scalar Converters
The main advantage of scalar converters is their lower cost compared to vector converters, with similar characteristics. Vector converters are programmed to perform more complex tasks, but scalar frequency regulators offer significant savings when used in simpler circumstances.
Usage in Industry
The most efficient application of frequency converters is in pumping systems, where energy savings exceed 50%. Although a vector converter can further reduce energy consumption by a few percentage points, the additional cost is not always justified.
Disadvantages of Vector Converters
- They require greater accuracy of input voltage readings, which increases the cost of devices.
- The repair of such devices may require significant investments.
However, despite the cost, vector frequency converters have found their place in industry due to their advantages in performance. They are suitable for systems with unstable indicators as well as for devices with a wide and unpredictable range of speeds, demonstrating high performance at both high and low speeds.