Frequency Method of Regulation of Electric Power Drives
The frequency method of regulating the operating modes of electric power drives has many advantages compared to other methods of motor control as well as the complete absence of control. The use of frequency converters allows for a significant increase in functionality, reliability, and productivity of units that include synchronous or asynchronous electric motors.
The correct selection and connection of the frequency converter can substantially enhance the efficiency of systems, leading to significant savings in electrical energy, labor, and financial costs, as well as a reduction in the use of other resources. However, poor installation or maintenance can minimize these advantages and even create additional problems.
Factors for Choosing a Frequency Converter
The choice of a frequency converter should be made considering numerous factors and the specifics of the drive's operation. Here are some of them:
- Frequency, phase, and voltage of the power supply network;
- Number of starts and stops.
There are several installations where the drive motor needs to be frequently stopped and started again. It is important to ensure an adequate response of the systems to the short-term shutdown of the motor followed by a restart when drive elements, such as shafts, continue to rotate due to inertia. Quality frequency converters are capable of successfully handling such modes, but it is necessary to choose the appropriate model and set it up correctly. This reduces the likelihood of accidents and failures, which in turn significantly lowers maintenance and repair costs.
For units that operate for extended periods without stops, the savings from frequency regulation may be less significant. Therefore, the type and nature of the load of the electric drive are among the key factors in selecting the brand and model of the frequency converter.