# Advantages of Variable Frequency Drive (VFD)

Advantages of Variable Frequency Drive (VFD)

Advantages of Variable Frequency Drive (VFD)

•While using VFD less maintenance is required.

•VFDs are energy saving device because it uses power electronics components like IGBT, GTO, SCR and Diode so the losses are less.

•VFD indirectly controls the magnetic flux of induction motor so there is less losses in starting of motor.

•VFD consist of filtering system which reduces power line disturbance.

•Accuracy of speed control of motor is good and smooth.

•Repairing cost of VFD is less.

•VFD improve productivity and product quality.

Advantages of Variable Frequency Drive (VFD)

## Related questions

Description : The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque  (1) Decreases (2) Increases (3) Remains constant (4) None of the above

Answer : The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque Increases

Description : In a self-controlled synchronous motor fed from a variable frequency inverter  (1) the rotor poles invariably have damper windings  (2) there are stability problems  (3) the speed of the rotor decides stator frequency  (4) the frequency of the stator decides the rotor speed

Answer : In a self-controlled synchronous motor fed from a variable frequency inverter the frequency of the stator decides the rotor speed

Description : what is variable frequency drive ?

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Description : What is the difference between a soft start and a VFD?

Description :

Answer :  IGBT or Insulated Gate Bi-polar Transistors are typically semiconductor devices aka.  controlled switches,  which find their applications in Power Electronics circuits such as Inverters, and electrical ... ( buy implementing suitable Pulse Width Modulation scheme ) * Lower cost

Description :

Answer : In variable speed motor a weaker commutating field is needed at low speed than at high speed.

Description : With sketch, justify use of Variable Geometry Turbocharger as compared to fixed geometry turbocharger.

Answer : Variable Turbine Geometry technology is the next generation in turbocharger technology where the turbo uses variable vanes to control exhaust flow against the turbine blades. The problem with the ... The angles of the vanes vary throughout the engine RPM range to optimize turbine behaviour.

Description : List variable flow meter.

Answer : 1. Variable area : Rotameter 2. Variable head : a) Venturi b) Orifice c) Pitot tube d) Nozzle

Description : Define resistor and draw symbol of variable resistor.

Answer : Resistor: A resistor is an electrical component that limits or regulates the flow of electrical current in an electronic circuit. Symbol of variable resistor:

Description : Compare variable head flow meter with variable area flow meter.

Answer : Parameter Variable head flowmeter Variable area flowmeter Working principle Restriction or obstacle is placed in the path of flow to create a differential Pressure. The pressure ... viscous fluid slurries and dirty fluids. In laboratories and testing and production lines.

Description : Compare variable reluctance and permanent magnet motors.

Answer : Variable reluctance Motor  Permanent magnet motors   The rotor is not magnetised The rotor is magnetised  High torque to inertia ratio  Low torque to inertia ratio  ... rotor has salient pole construction The rotor has mostly smooth cylindrical type of construction.

Description :

Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).

Answer : (i) Balancing Phase currents: Proper (healthy balanced) three phase loads always draw equal currents in all lines but single phase loads in the 3 phase 4 wire system or loads connected between two ... . 11) Minimize I2R losses. 12) Balance the load currents. 13) Regulate the system voltages.

Description : With the knowledge of the state variable representation of a plant the transfer function of the plant

Answer : With the knowledge of the state variable representation of a plant the transfer function of the plant can be determined completely

Description :

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Description : In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current

Answer : In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current

Description :

Answer : For constant torque drive armature voltage control speed control method is preferred.

Description : The synchronous motor which works on leading power factor and does not drive any mechanical load is called?

Answer : The synchronous motor which works on leading power factor and does not drive any mechanical load is called synchronous condenser.

Description : What is the need for electrically isolated drive circuits?

Description : Explain transformer isolated drive circuits providing both signal and power.

Description : What are the fundamental requirements of gate drive ICs?

Description : What is the difference between AC and DC drive?

Answer : AC means alternating current It's Frequency is 50hz Dc means direct current ItsI Frequency is 0Hz

Description : What is an electric motor drive?

Answer : An electric drive is a complex electromechanical system that drives various actuators in industrial and industrial work machines. In this case, control is carried out using a technological process ... calculation of the kinematic and load characteristics of the electric drive is carried out.

Description : What is a drive in electrical controls?

Description : What does an electric drive do?

Description : Can a power surge erase a hard drive?

Description : Explain MOSFET gate drive circuit and totem pole configuration.

Answer : MOSFET gate drive circuit: The turning on and turning off of MOSFET can be controlled from gate to source voltage signal. If the gate to source voltage of MOSFET exceeds threshold ... this configuration, the two switches (transistors) are used in totem pole arrangement with a comparator.

Description : Explain open emitter BJT drive circuit.

Answer : open emitter BJT drive circuit:

Description : Explain DC coupled drive circuit with unipolar output.

Answer : DC coupled drive circuit with unipolar output: The figure shows the circuit and waveforms

Description : Explain thyristor gate drive circuit.

Answer : Thyristor Gate Drive Circuit: The thyristor can be turned on by pulse voltage signal at gate terminal and it does not require continuous drive signal like the transistor. The gate ... circuit provide required minimum gate voltage and gate current then the thyristor conducts properly.

Description : basic gate drive circuit of GTO

Answer : basic gate drive circuit of GTO

Description : Scherbius Drive System

Description : Kramer Drive System

Answer : Kramer Drive System Kramer drive is a rotor side speed control drive of induction motor. Slip is the difference between synchronous speed and rotor speed. It is the ... and DC motor. The static Kramer drive is costlier because of the cost of DC motor.

Description : Are there any advantages to PVC windows?

Answer : Have you decided to change your windows to new ones and don't know where to start? Let's start with the fact that windows are a very important part of any house or apartment, thanks to ... Another thing you need to pay attention to when ordering is that the profile must meet all quality standards.

Description : What are the advantages of LED lamps?

Answer : What are the advantages of LED lamps? LED lamps have an advantage over fluorescent lamps in the first place in terms of environmental friendliness. Another reason for using LED lamps is ... advantages. Today, such lamps are used in everyday life, for industrial lighting and street lighting.

Description : State the four advantages of MIG welding.

Answer : Four advantages of MIG welding: 1. High quality welds can be produced much faster. 2. Flux is not used there is no chance for the entrapment of slag in the weld metal resulting in high quality ... of metals and alloys. 5. Least expensive and highly economic. 6. Little or no post welds cleaning.

Description : State 2 advantages of JFET over BJT.

Answer : Advantages of JFET over BJT: 1) High input impedance 2) Better thermal stability 3) Produce less noise 4) Smaller than BJT 5) Rugged in construction and simpler to fabricate 6) High degree of isolation between Input and Output.

Description : Advantages of LED over CFL.

Answer : Advantages of LED over CFL. 1) Efficiency: LED bulbs use close to a third of the amount of power CFL bulbs would use to produce the same amount of light. This makes them ... decorative to heavy duty industrial applications.  6) Maintenance: Smooth light and low maintenance compared to CFL

Answer : Advantages of radial distributor system: 1. Design of layout is simple. 2. Capital cost & Erecting cost is less as there is only one feeder. 3. Time required for completion of ... maintain supply to consumers when there is maintenance on feeder. 3. Voltage fluctuations are more.

Description : State the advantages of use of high voltage in transmission of Electric power.

Answer : Advantages: 1. As Transmission voltage increases, current decreases. 2. As current decreases, cross section of conductor decreases. 3. As cross section of conductor decreases, its ... high voltage transmission line, successful interconnection of transmission line is possible than low voltage.

Description : State the advantages of SMPS.

Answer : Advantages of SMPS: 1. High Efficiency, more than 94%. 2. Easy maintenance and servicing. 3. High modularity and redundancy. 4. Lower power dissipation. 5. Wide AC input voltage range. 6. Less cost.

Description : State any two advantages of MCB over Fuse. State the standard specifications of MCB available in the market.

Answer : Following advantages of MCB over Fuse: 1. No need of replacement of fuse wire. 2. Manually restore of supply is simple. 3. Fault understanding by visual inspection 4. More safe than fuse The standard specifications of ... 6A, 10A,16A,20A, 25A, 30A, 32A, 40A, 50A, 60A and 63A 6. 250V and 450 v

Description : State advantages of rotating field type alternators.

Answer : Advantages of Rotating Field Type Alternator: 1) For high-voltage alternator, large space is required to accommodate conductors with insulation, as high voltage is induced in them. If field poles are placed ... is kept rotating. 8) Rotating field is comparatively light and can run with high speed.

Description : State advantages of short pitch winding over full pitch winding in alternators.

Answer : Advantages of Short Pitch Winding over Full Pitch Winding in Alternators: 1) Short pitching reduces the amount of copper needed for end connection when compared with full pitched coil. 2) They ... reduced, thereby increasing the efficiency. 4) The power quality of generated emf is improved.

Description : State the advantages of cogeneration.

Answer : Advantages of co-generation: 1) Co-generation can meet both power & heat requirements. 2) Less cost than conventional generation. 3) Higher system efficiency due to energy wastage is highly ... reduces due to cogeneration plant is located in same premises. 10) It can maintain grid stability

Description : State advantages of MOSFET.

Answer : Advantages of MOSFET * MOSFETs provide greater efficiency while operating at lower voltages. * Absence of gate current results in high input impedance. * High switching speed. * They operate at lower ... due to lower resistance of channel. * They are easy to manufacture. * They are portable.

Description : What do you mean by active filter? State its advantages over passive filter . Define pass band & stop band with respect to filter.

Answer : Active Filter: Active Filter is formed by using active element along with the passive components.  Advantages of Active filter over Passive filter: High value of pass band gain can be obtained. It is ... pass band.  Stop Band Filter: The frequency range which is attenuated is known as stop band.

Description : How GTO is advantages over SCR

Answer : i) It is turned-off by negative gate pulse. ii) No commutation circuit required, reducing the cost, size, weight and volume of the circuit. iii) As commutation choke is not used, the associated acoustic ... turn off time permits high switching frequency. v) It has higher di/dt rating at turn-off.