Electrical Engineering - SK Engineering Academy
... The process by which current in the short circuited coil is reversed while it crosses the magnetic neutral axis is called “commutation”. The brief period during which coil remains short circuited is known as commutation period. 35. What happens when a D.C. Shunt motor is directly connected to the s ...
... The process by which current in the short circuited coil is reversed while it crosses the magnetic neutral axis is called “commutation”. The brief period during which coil remains short circuited is known as commutation period. 35. What happens when a D.C. Shunt motor is directly connected to the s ...
i) Synchronous Machines
... • Induction Motors: Most widely used electrical motors in both domestic and industrial applications. • Induction Generators: Due to lack of a separate field excitation, these machines are rarely used as generators. ...
... • Induction Motors: Most widely used electrical motors in both domestic and industrial applications. • Induction Generators: Due to lack of a separate field excitation, these machines are rarely used as generators. ...
Lecture23
... – Where energy cost is forecast to significantly over 15 cents per KWH within a 3 year period an SMPS should be a consideration. – Where there is only battery, solar or wind powered electricity supply (I.e. energy costs more than 15c/KWH) – When your client is Green / environmentally responsible / s ...
... – Where energy cost is forecast to significantly over 15 cents per KWH within a 3 year period an SMPS should be a consideration. – Where there is only battery, solar or wind powered electricity supply (I.e. energy costs more than 15c/KWH) – When your client is Green / environmentally responsible / s ...
Aalborg Universitet Integrated Magnetics
... neutral point diode clamped (3L-NPC) topology is commonly used [1]. However, an extra control efforts are required to balance the dc-link capacitor voltage [2]. Moreover, the semiconductor loss distribution is unequal [3] and this may lead to the de-rating of the Voltage Source Converter (VSC) [4]. ...
... neutral point diode clamped (3L-NPC) topology is commonly used [1]. However, an extra control efforts are required to balance the dc-link capacitor voltage [2]. Moreover, the semiconductor loss distribution is unequal [3] and this may lead to the de-rating of the Voltage Source Converter (VSC) [4]. ...
NO OUTPUT (ALL GENERATORS)
... Current flow (reading) should be detected in only one direction. If diode reads current flow in both or neither direction it should be replaced. d. Depending on model. Repeat step a thru c for the other diode if installed. NOTE: All of the two diode systems use one forward polarity and one reverse p ...
... Current flow (reading) should be detected in only one direction. If diode reads current flow in both or neither direction it should be replaced. d. Depending on model. Repeat step a thru c for the other diode if installed. NOTE: All of the two diode systems use one forward polarity and one reverse p ...
Ignition System Fundamentals
... • Current limiting system – Has variable resistance within an ignition module • Ignition module turns current flow off as soon as coil primary winding is saturated ...
... • Current limiting system – Has variable resistance within an ignition module • Ignition module turns current flow off as soon as coil primary winding is saturated ...
Building a Digital Speedo
... The aluminium plate was then screwed to the underbody of my car, with the coil being mounted about 10-15mm away from the magnets on the tailshaft. If using weaker magnets, or a smaller coil, you'll need to locate the coil closer to the tailshaft. Due to the rotational speed of the tailshaft, the cen ...
... The aluminium plate was then screwed to the underbody of my car, with the coil being mounted about 10-15mm away from the magnets on the tailshaft. If using weaker magnets, or a smaller coil, you'll need to locate the coil closer to the tailshaft. Due to the rotational speed of the tailshaft, the cen ...
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... Corrosion introduce variation in pipe wall thickness; the 2.5” diameter pipes can vary in wall thickness from 4 mm to 8 mm. The minimum tensile yield strength of SA-106 grade B carbon steel is 240 MPa [1]. An outlet feeder pipe was removed from service in 1997 following detection of a coolant leak. ...
... Corrosion introduce variation in pipe wall thickness; the 2.5” diameter pipes can vary in wall thickness from 4 mm to 8 mm. The minimum tensile yield strength of SA-106 grade B carbon steel is 240 MPa [1]. An outlet feeder pipe was removed from service in 1997 following detection of a coolant leak. ...
Aalborg Universitet PowerFactory Software
... In harmonic analysis studies, power transformers can be either modelled as linear power system components, or using more sophisticated models that take into account the iron core nonlinearity and its property of distorting currents resulting in an “injection” of harmonic currents into the network. I ...
... In harmonic analysis studies, power transformers can be either modelled as linear power system components, or using more sophisticated models that take into account the iron core nonlinearity and its property of distorting currents resulting in an “injection” of harmonic currents into the network. I ...
Task 6 - Final Stakeholder Meeting
... maintain the magnetic field across that gap. The motor will then require less current to drive the load and thereby reduce I2R losses. • For single-phase motors, adding a secondary “run” capacitor ...
... maintain the magnetic field across that gap. The motor will then require less current to drive the load and thereby reduce I2R losses. • For single-phase motors, adding a secondary “run” capacitor ...
Document
... holes current flows and heat is produced. • With some materials, when electrons combine with holes, photons of light are emitted. This forms an LED. • LEDs are generally used as indicators, but they have the same properties as a regular diode. ...
... holes current flows and heat is produced. • With some materials, when electrons combine with holes, photons of light are emitted. This forms an LED. • LEDs are generally used as indicators, but they have the same properties as a regular diode. ...
UNIT-IV 1 Mark questions
... 14. A 220 V shunt motor develops a torque of 54 N-m at armature current of 10 A.The torque produced when the armature current is 20 A, is (a) 54 N-m (b) 81 N-m (c) 108 N-m (d) None of the above 15. The d.c. series motor should never be switched on at no load because (a) the field current is zero ...
... 14. A 220 V shunt motor develops a torque of 54 N-m at armature current of 10 A.The torque produced when the armature current is 20 A, is (a) 54 N-m (b) 81 N-m (c) 108 N-m (d) None of the above 15. The d.c. series motor should never be switched on at no load because (a) the field current is zero ...
Coilgun
A coilgun (or Gauss rifle, in reference to Carl Friedrich Gauss, who formulated mathematical descriptions of the magnetic effect used by magnetic accelerators) is a type of projectile accelerator consisting of one or more coils used as electromagnets in the configuration of a linear motor that accelerate a ferromagnetic or conducting projectile to high velocity. In almost all coilgun configurations, the coils and the gun barrel are arranged on a common axis.Coilguns generally consist of one or more coils arranged along a barrel, so the path of the accelerating projectile lies along the central axis of the coils. The coils are switched on and off in a precisely timed sequence, causing the projectile to be accelerated quickly along the barrel via magnetic forces. Coilguns are distinct from railguns, as the direction of acceleration in a railgun is at right angles to the central axis of the current loop formed by the conducting rails. In addition, railguns usually require the use of sliding contacts to pass a large current through the projectile or sabot but coilguns do not necessarily require sliding contacts. Whilst some simple coilgun concepts can use ferromagnetic projectiles or even permanent magnet projectiles, most designs for high velocities actually incorporate a coupled coil as part of the projectile.