The Necessity of Speed Control of Asynchronous Motors
The need for controlling the speed of asynchronous motors arose immediately after their invention. The most modern device for regulating the speeds of electric motors today is a frequency converter, which is also known as an inverter. It converts and shapes the voltage of the required frequency at the output. The frequency values obtained in this way are supplied to the motor, changing the frequency of its magnetic field rotation, which, in turn, affects the rotational speed of the output shaft of the electric motor. This provides:
- - Constant adjustment of the operating speed;
- - Quick adjustment of torque according to mechanical load;
- - Minimum losses due to maintaining stability under any load and speed conditions.
Advantages of Using Motors with Frequency Control
Thanks to the ability of converters to fully adjust the operation of the motor, their implementation in production and other fields has led to numerous advantages regarding control, efficiency, and quality enhancement.
- - Remote control, without the need to approach the processing area where the motor is installed;
- - Increased speed regulation according to production needs;
- - Improved product quality due to precise control of speed parameters;
- - Use of frequency-controlled equipment.
Application Areas of Frequency Control
Today, control of the rotational frequency of drives is relevant in many areas. From municipal services to conveyor lines of enterprises, frequency converters are widespread in control systems for:
- Pumping equipment: frequency converters for air purification systems, ventilation systems, and cooling systems: converters VFD-EL, ALTIVAR 12, ATV320, and others.
- - Monitoring pollution levels and air safety using sensors;
- - Load adjustment;
- - Control of humidity and temperature levels.
- Lift and conveyor systems: frequency converters with built-in braking modules VFD-E, EFC5610, VFC5610.
- - Provide smooth and uniform movement of elements;
- - Support increased energy capacity of the system;
- - Control torque fluctuations when forming loads;
- - Adjust operating parameters considering system loading.
Therefore, it can be asserted that the use of frequency control devices for drive mechanisms contributes to increased efficiency of production processes while maintaining reliability and operability of all circuits, allowing for budgetary savings.