Engineering English
Variable Frequency Drive
Energy Engineering · Mechatronics & Robotics · Electrical Engineering · Last updated: July 30, 2026 · How this entry was written
Definition: An electronic device that controls the speed and torque of an AC electric motor by varying the frequency and voltage of the power supplied to it.
Example in context
“Retrofitting the cooling tower fan with a variable frequency drive cut energy consumption by 35% while maintaining the required airflow.”
“Soğutma kulesi fanına değişken frekanslı sürücü takılması, gerekli hava akışını korurken enerji tüketimini %35 azalttı.”
Where engineers use it
Widely used in HVAC, pumping and conveyor systems for demand-side management; energy auditors recommend VFDs to match motor speed to actual load, reducing part-load losses.
Synonyms: VFD, adjustable speed drive, inverter drive
Antonyms: fixed speed drive
In Mechatronics & Robotics
A variable frequency drive (VFD) is a device that controls the speed and torque of an AC motor by varying the frequency and voltage supplied to the motor. It enables energy-efficient motor control in industrial applications.
“The conveyor system uses a variable frequency drive to smoothly adjust belt speed for different product throughput rates.”
In Electrical Engineering
A power electronic drive that controls motor speed and torque by varying the frequency and voltage supplied to the machine. It rectifies the incoming supply and rebuilds an adjustable output waveform.
“Fitting a variable frequency drive to the ventilation fan cut the energy bill sharply because the airflow now follows actual demand.”
Practice: can you use “Variable Frequency Drive” at work?
A production line runs a 50 hp fan continuously at full speed, but actual need varies. Calculate potential savings from a VFD and explain the harmonic distortion implications.
Show a model answer
“Install a variable frequency drive on the main chilled water pump to optimize flow control.”
“Variable Frequency Drive” in 21 languages
| English | Variable Frequency Drive |
|---|---|
| Turkish | değişken frekanslı sürücü |
| French | variateur de fréquence |
| German | Frequenzumrichter |
| Spanish | variador de frecuencia |
| Chinese | 变频驱动器 |
| Arabic | محرك تردد متغير |
| Portuguese | inversor de frequência |
| Russian | частотно-регулируемый привод |
| Japanese | 可変周波数ドライブ |
| Italian | azionamento a frequenza variabile |
| Vietnamese | biến tần |
| Hindi | चर आवृत्ति ड्राइव |
| Thai | ไดรฟ์ความถี่แปรผัน |
| Indonesian | penggerak frekuensi variabel |
| Korean | 가변 주파수 드라이브 |
| Bengali | পরিবর্তনশীল ফ্রিকোয়েন্সি ড্রাইভ |
| Dutch | frequentieregelaar |
| Swedish | frekvensomriktare |
| Finnish | taajuusmuuttaja |
| Ukrainian | частотно-регульований привід |
Frequently asked questions
What does Variable Frequency Drive mean in engineering?
An electronic device that controls the speed and torque of an AC electric motor by varying the frequency and voltage of the power supplied to it. In Energy Engineering, the term carries a usage-frequency rating of 10/10 in the Engineering English library.
How do you pronounce Variable Frequency Drive?
Variable Frequency Drive is pronounced /ˈvɛriəbəl ˈfrikwənsi draɪv/ (IPA). The Engineering English app plays audio for the term and checks your pronunciation with speech recognition.
How is Variable Frequency Drive used in a sentence?
Example from an engineering context: “Retrofitting the cooling tower fan with a variable frequency drive cut energy consumption by 35% while maintaining the required airflow.”
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