Frequency Changer
A frequency changer, also known as a frequency converter or frequency inverter, is an electronic device used to change the frequency of an alternating current (AC) power supply. The primary purpose of a frequency changer is to adjust the speed of an electric motor, typically used to drive a machine or process. Frequency changers are used in various industrial and commercial applications, including manufacturing, mining, oil and gas production, and water treatment. The frequency changer typically consists of a rectifier, which converts the AC input power to direct current (DC), and an inverter, which converts the DC power back to AC at the desired output frequency. Most frequency changers are classified as variable frequency drive (VFD), which can be controlled by a control system such as PLC or PC [Jiang].
Definition of frequency changer:a motor generator used to change the frequency of an alternating-current circuit with or without a phase or voltage change.
A frequency changer or frequency converter is an electronic or electromechanical device that converts alternating current (AC) of one frequency to alternating current of another frequency. The device may also change the voltage, but if it does, that is incidental to its principal purpose, since voltage conversion of alternating current is much easier to achieve than frequency conversion.
They are also used in some residential and commercial settings, such as air conditioning and heating systems, to control the speed of fans and pumps. The input frequency of the device is typically 50 or 60 hertz (Hz), and the output frequency can be adjusted to any value within a specific range, usually between 0 and 500 Hz. By changing the power supply's frequency, the motor's speed can be precisely controlled, allowing for more efficient and accurate operation of the machine or process. Some frequency changers include additional features such as voltage regulation, harmonic filtering, and over-current protection. This allows the user to adjust the frequency, and hence the speed of the machine or process, in real-time based on the application's needs [Yadav & Tripathi].
A frequency changer or frequency converter is an electronic or electromechanical device that converts the alternating current (AC) of one frequency to the alternating current of another frequency. The device may also change the voltage, but if it does, that is incidental to its principal purpose since voltage conversion of alternating current is much easier to achieve than frequency conversion. Traditionally, these devices were electromechanical machines called motor-generator sets [Blalock, Thomas J.]
Словник Webster's Dictionary https://www.merriam-webster.com/
Blalock, Thomas J., "The Frequency Changer Era: Interconnecting Systems of Varying Cycles Archived 2007-06-07 at the Wayback Machine". The history of various frequencies and interconversion schemes in the US at the beginning of the 20th century.
Jiang, L., Liu, Z., & Liu, F. (2016). Research on the harmonic suppression of high power frequency changer. Electric Power Systems Research, 1-8.
Yadav, R. K., & Tripathi, R. (2017). A review on power electronic converters for frequency changer applications. Journal of Power Electronics, 17(1), 1-20.
Blalock, Thomas J. (2007). The Frequency Changer Era: Interconnecting Systems of Varying Cycles. Wayback Machine. The history of various frequencies and interconversion schemes in the US at the beginning of the 20th century.