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Variable-frequency drive

About: Variable-frequency drive is a research topic. Over the lifetime, 837 publications have been published within this topic receiving 5691 citations. The topic is also known as: VFD.


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Patent
20 May 2014
TL;DR: A gas turbine engine includes a compressor, a combustor adjacent the compressor and a turbine adjacent the combustor, a shaft, a motor, a primary variable frequency drive, and an auxiliary motor.
Abstract: A gas turbine engine includes a compressor, a combustor adjacent the compressor, a turbine adjacent the combustor, a shaft, a motor, a primary variable frequency drive, an auxiliary variable frequency drive, and an auxiliary motor. The motor is coupled to the shaft. The primary variable frequency drive is electrically connected to the motor and an AC power source. The auxiliary variable frequency drive is electrically connected to the primary frequency drive. The auxiliary motor is electrically connected to the auxiliary variable frequency drive.

6 citations

Patent
01 Feb 2012
TL;DR: A hydraulic lift system for artificial lift pumping or industrial hoisting comprises a three chamber cylinder, a gas over oil accumulator, a large structural gas accumulator and a large flow pilot operated check valve as discussed by the authors.
Abstract: A hydraulic lift system for artificial lift pumping or industrial hoisting comprises a three chamber cylinder, a gas over oil accumulator, a large structural gas accumulator and a large flow pilot operated check valve. A matrix variable frequency drive, a standard variable frequency drive, an electrical squirrel cage motor or a natural gas engines are part of the main prime mover alternatives.

6 citations

Patent
08 Sep 2017
TL;DR: In this paper, a smart power module and a variable frequency drive are presented, which includes an upper bridge arm drive circuit and a lower bridge drive circuit connected with an inverter bridge separately.
Abstract: The invention discloses a smart power module and a variable frequency drive. The smart power module includes an upper bridge arm drive circuit and a lower bridge arm drive circuit connected with an inverter bridge separately; an overcurrent protection mode selecting circuit used for receiving and outputting overcurrent protection mode signals; an overcurrent protection time delay circuit used for receiving and outputting overcurrent protection time delay signals; an overcurrent protection circuit used for outputting overcurrent detection signals after detecting that current flowing to a load connected with the smart power module is greater than a preset current value; an inverter bridge control logic circuit used for controlling the engagement and disengagement of the upper bridge arm drive circuit and/or the lower bridge arm drive circuit according to the overcurrent protection mode signals, the overcurrent protection time delay signals and the overcurrent detection signals. According to the invention, damage of the variable frequency drive caused by that current flowing through a compressor is greater than a preset value due to factors such as pressure and the like is avoided.

6 citations

Patent
16 Nov 2012
TL;DR: In this paper, an active converter connected to an inverter is used to convert single phase AC power to DC power and DC power to single-phase AC power, and maintain constant DC voltage between the bus bars.
Abstract: A regenerative variable frequency drive includes an active converter connected to an inverter. The converter has a filter capacitor, an inductor, two half bridges, bus bars that connect to the inverter and bus capacitors. The converter converts single phase AC power to DC power and DC power to single phase AC power, boosts the AC power, reduces input line harmonics, maintains input current in phase with utility voltage in order to achieve near unity power factor, and maintains constant DC voltage between the bus bars.

6 citations

01 Jan 2011
TL;DR: This paper describes the design processes for a 3-Phase Variable Frequency Drive as broken up into two stages: The AC-DC converter and the DC-AC converter.
Abstract: This paper describes the design processes for a 3-Phase Variable Frequency Drive (VFD) as broken up into two stages: The AC-DC converter and the DC-AC converter. It acknowledges three (3) design versions, all. The output of the motor drive is 3-phase pulse width modulation (PWM) ranging in possible operation frequencies from 0Hz to 13kHz. The frequency control circuit uses an Arduino Uno based of the ATMEGA 328p.

6 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20239
202220
202143
202084
201956
201887