1)______ types of Induction Motor are widely used. A. SlipringIM B
... 9) For a 3φ transmission line transmission efficiency of a line decreases with A. increase in load p.f. B. Does not vary with power factor C. increase in load current. D. decrease in load p.f. 10) Which combination is true for any transmission line A. A⃗ = 52, B⃗ = 0.8, C⃗ = 25, D⃗ = 0.385 B. . A⃗ = ...
... 9) For a 3φ transmission line transmission efficiency of a line decreases with A. increase in load p.f. B. Does not vary with power factor C. increase in load current. D. decrease in load p.f. 10) Which combination is true for any transmission line A. A⃗ = 52, B⃗ = 0.8, C⃗ = 25, D⃗ = 0.385 B. . A⃗ = ...
Development of Electro-Magnetic Brake System
... • Inversely proportional to the length of air gap between the poles. In general, an electromagnet is often considered better than a permanent magnet because it can produce very strong magnetic fields and its strength can be controlled by varying the number of turns in its coil or by changing the cu ...
... • Inversely proportional to the length of air gap between the poles. In general, an electromagnet is often considered better than a permanent magnet because it can produce very strong magnetic fields and its strength can be controlled by varying the number of turns in its coil or by changing the cu ...
Week 1 - DCU School of Computing
... Electric current heats the substance it passes through. Too big a current can cause fire. Wires must be thick enough (low resistance) to carry the maximum current without overheating. To ensure this, circuits include fuses, thin wires which melt first and breaks the current if it exceeds a safe limi ...
... Electric current heats the substance it passes through. Too big a current can cause fire. Wires must be thick enough (low resistance) to carry the maximum current without overheating. To ensure this, circuits include fuses, thin wires which melt first and breaks the current if it exceeds a safe limi ...
talk-czech tech. univ.-07
... Difficulties with injecting spin polarized currents from metal ferromagnets to semiconductors, with spincoherence, etc. not yet realized ...
... Difficulties with injecting spin polarized currents from metal ferromagnets to semiconductors, with spincoherence, etc. not yet realized ...
Document
... 19--9: Core Losses Hysteresis losses The hysteresis losses result from the additional power needed to reverse the magnetic field in magnetic materials in the presence of alternating current. The greater the frequency, the more hysteresis loss. Air-core coils Air has practically no losses from ...
... 19--9: Core Losses Hysteresis losses The hysteresis losses result from the additional power needed to reverse the magnetic field in magnetic materials in the presence of alternating current. The greater the frequency, the more hysteresis loss. Air-core coils Air has practically no losses from ...
IES PE Short Course
... The shape of the individual winding fields Ba, Bb, Bc, throughout the air gap are spatially fixed, but their amplitudes pulsate up and down. In contrast, the amplitude of the composite is fixed in time, but it rotates in space. What you see in the visualization are just the variation of the maximum ...
... The shape of the individual winding fields Ba, Bb, Bc, throughout the air gap are spatially fixed, but their amplitudes pulsate up and down. In contrast, the amplitude of the composite is fixed in time, but it rotates in space. What you see in the visualization are just the variation of the maximum ...
speed control of motor
... invention of electricity. A motor is nothing but an electromechanical device that converts electrical energy to mechanical energy. ...
... invention of electricity. A motor is nothing but an electromechanical device that converts electrical energy to mechanical energy. ...
ATE1120: Electrical Fundamental-II
... DC motors as shown in Figure 2.2 consist of one set of coils, called armature winding, inside another set of coils or a set of permanent magnets, called the stator. Applying a voltage to the coils produces a torque in the armature, resulting in motion. The main parts of the DC motor are : 1. STATOR: ...
... DC motors as shown in Figure 2.2 consist of one set of coils, called armature winding, inside another set of coils or a set of permanent magnets, called the stator. Applying a voltage to the coils produces a torque in the armature, resulting in motion. The main parts of the DC motor are : 1. STATOR: ...
Induction motor - KUET | Khulna University of Engineering
... of flux, the rotating vector indicates there is a rotating magnetic field within stator having constant amount of flux. The speed at which flux rotates is called synchronous speed. But this is apparent that rotating field cuts each of the coils also during rotation. So it induces a voltage into the ...
... of flux, the rotating vector indicates there is a rotating magnetic field within stator having constant amount of flux. The speed at which flux rotates is called synchronous speed. But this is apparent that rotating field cuts each of the coils also during rotation. So it induces a voltage into the ...
Electric Drives_MyCourses
... Rated voltage – winding insulation Rated current – ohmic resistive losses Rated field – magnetic saturation of the material Rated power = T*omega ...
... Rated voltage – winding insulation Rated current – ohmic resistive losses Rated field – magnetic saturation of the material Rated power = T*omega ...
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.