Frequency Converter

A frequency converter is a tool or device that changes a frequency value from one unit to another — for example, converting Hertz (Hz) to Kilohertz (kHz) or Megahertz (MHz). In the context of electrical power, a frequency converter can also refer to an electronic device that changes AC power from one frequency (e.g. 50 Hz) to another (e.g. 60 Hz).

All frequency units are related to the base unit Hertz (Hz). To convert between units, you multiply or divide by powers of 10. For example, 1 kHz = 1,000 Hz, 1 MHz = 1,000,000 Hz, and 1 GHz = 1,000,000,000 Hz. Radians per second (rad/s) relates to Hz by the formula: rad/s = 2π × Hz.

50 Hz and 60 Hz are the two standard AC power frequencies used around the world. Europe, Asia, Africa, and Australia predominantly use 50 Hz, while North America and parts of South America use 60 Hz. Using electrical equipment rated for one frequency on a supply of the other can cause issues such as overheating or incorrect motor speeds.

Running a 50 Hz motor on 60 Hz power generally increases its speed by about 20%, which can cause overheating, excess noise, and reduced efficiency. Similarly, a 60 Hz motor on 50 Hz power will run slower than rated. A frequency converter device is used to safely adapt power supply frequency for such equipment.

400 Hz power is primarily used in aerospace and military applications, including aircraft on-board systems and military vehicles. Its higher frequency allows for smaller, lighter transformers and motors compared to 50 Hz or 60 Hz systems, making it ideal for weight-sensitive environments.

To convert Hertz (Hz) to radians per second (rad/s), multiply the frequency in Hz by 2π (approximately 6.2832). For example, 60 Hz equals 60 × 2π ≈ 376.99 rad/s. This conversion is commonly used in electrical engineering and physics calculations.

Common frequency units include Millihertz (mHz, 10⁻³ Hz), Hertz (Hz, the base unit), Kilohertz (kHz, 10³ Hz), Megahertz (MHz, 10⁶ Hz), Gigahertz (GHz, 10⁹ Hz), and Terahertz (THz, 10¹² Hz). Radio waves are typically measured in kHz to GHz, while visible light frequencies reach into THz ranges.

Frequency refers to how many cycles per second an alternating current (AC) completes, measured in Hertz (Hz). Voltage refers to the electrical potential difference, measured in Volts (V). They are independent properties — a frequency converter changes the cycle rate without necessarily altering voltage, though many AC power converters handle both simultaneously.