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2. Frequency changer - Wikipedia

   en.wikipedia.org/wiki/Frequency_changer

   A variable-frequency drive (VFD) is a type of frequency changer used for speed control of AC motors such as used for pumps and fans. The speed of a synchronous or induction AC motor is dependent on the frequency of the AC power supply, so changing frequency allows the motor speed to be changed. This allows fan or pump output to be varied to ...

3. Inverter compressor - Wikipedia

   en.wikipedia.org/wiki/Inverter_compressor

   Before, fixed-speed on/off compressors required an inrush, or surge, current that was 4 to 6 times greater than the running current at startup, meaning a requirement of 4 to 6 times more solar panels or batteries. Inverter compressors start slowly and avoid this startup power which is needed each time a standard on/off compressor comes on.

4. Booster (electric power) - Wikipedia

   en.wikipedia.org/wiki/Booster_(electric_power)

   In the days of direct current mains, voltage drop along the line was a problem so line boosters were used to correct it. Suppose that the mains voltage was 110 V. Houses near the power station would receive 110 volts but those remote from the power station might receive only 100 V so a line booster would be inserted at an appropriate point to "boost" the voltage.

5. AC motor - Wikipedia

   en.wikipedia.org/wiki/AC_motor

   An AC motor is an electric motor driven by an alternating current (AC). The AC motor commonly consists of two basic parts, an outside stator having coils supplied with alternating current to produce a rotating magnetic field , and an inside rotor attached to the output shaft producing a second rotating magnetic field.

6. Electric power conversion - Wikipedia

   en.wikipedia.org/wiki/Electric_power_conversion

   A power converter is an electrical device for converting electrical energy between alternating current (AC) and direct current (DC). It can also change the voltage or frequency of the current. Power Converters can include simpler tools such as transformer or more complex like a resonant converter .

7. Dry running protection - Wikipedia

   en.wikipedia.org/wiki/Dry_running_protection

   Dry running protection, also known as dry-run protection or dry-running protection, is a type of protection mechanism to prevent a rotor, pump or stirrer shaft from operating without any medium added, as the bearing and shaft seal might be damaged if the motor is run while dry. [1]