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variable-frequency drive (A variable-frequency drive (VFD) (also termed adjustable-frequency drive, variable-speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage. VFDs are used in applications ranging from small app... Found on  wikipedia.org Alexander Demidov) | |||
| frequency shifter (сам русский термин на мой взгляд странен; чаще встречается variable frequency drive Vadim_Dmitriev) | |||
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