Electrical Machines - Questions and Answers
... tends to be less on full volts than on reduced volts so the current and torque values tend to be rather less than those obtained by the formulae given. 33. How do the various methods of starting on reduced voltage compare as regards torque per ampere? Star-delta and auto-transformer methods have the ...
... tends to be less on full volts than on reduced volts so the current and torque values tend to be rather less than those obtained by the formulae given. 33. How do the various methods of starting on reduced voltage compare as regards torque per ampere? Star-delta and auto-transformer methods have the ...
- Institut d`Electronique Fondamentale
... CoFeB-based systems was first demonstrated for a TbCoFe/ CoFeB/MgO/CoFeB/TbCoFe nanopillar, but this structure exhibited a low TMR ratio [15]. Recent progress in materials engineering involving perpendicular CoFeB/MgO/CoFeB systems has led to TMR ratios of up to 120% [16], with even lower IC0 and fa ...
... CoFeB-based systems was first demonstrated for a TbCoFe/ CoFeB/MgO/CoFeB/TbCoFe nanopillar, but this structure exhibited a low TMR ratio [15]. Recent progress in materials engineering involving perpendicular CoFeB/MgO/CoFeB systems has led to TMR ratios of up to 120% [16], with even lower IC0 and fa ...
Fundamental Electricity Student Study Notes
... LAB: Sketch and describe how to locate a dead short circuit. In a circuit with a dead short the circuit breaker or fuse will be open. If you reset the circuit breaker or replace the fuse it will blow open as soon as the circuit is reenergized. This occurs because total resistance for the circuit is ...
... LAB: Sketch and describe how to locate a dead short circuit. In a circuit with a dead short the circuit breaker or fuse will be open. If you reset the circuit breaker or replace the fuse it will blow open as soon as the circuit is reenergized. This occurs because total resistance for the circuit is ...
AP1603 STEP-UP DC/DC CONVERTER Description
... A poor choice for an output capacitor can result in poor efficiency and high output ripple. Ordinary aluminum electrolyzers, while inexpensive, may have unacceptably poor ESR and ESL. There is a low ESR aluminum capacitor for switch mode DC-DC converters which work much better than the general purpo ...
... A poor choice for an output capacitor can result in poor efficiency and high output ripple. Ordinary aluminum electrolyzers, while inexpensive, may have unacceptably poor ESR and ESL. There is a low ESR aluminum capacitor for switch mode DC-DC converters which work much better than the general purpo ...
Herbert Stemmler
... CSIs) are the most commonly used basic circuits for large drives. They are simple and easy to build for high-power applications. With regard to their characteristics they, however, are inferior: When implemented at the mains side they draw a 120° square wave current, which lags the voltage by 0° to ...
... CSIs) are the most commonly used basic circuits for large drives. They are simple and easy to build for high-power applications. With regard to their characteristics they, however, are inferior: When implemented at the mains side they draw a 120° square wave current, which lags the voltage by 0° to ...
The Uranium Bomb^ the Calutron, and the Space
... When we arrived at Berkeley, experiments were already under way in a small vacuum-chamber tank placed between the poie pieces of the 37-inch magnet. Also, tbere was arc-ion-source development using a smaller magnet from the cosmic-ray program. Getting sufficient ion current from the source was the g ...
... When we arrived at Berkeley, experiments were already under way in a small vacuum-chamber tank placed between the poie pieces of the 37-inch magnet. Also, tbere was arc-ion-source development using a smaller magnet from the cosmic-ray program. Getting sufficient ion current from the source was the g ...
Basic Electrical Technology Prof. Dr. L. Umanand Department of
... So now let us look at these primary components one by one, the resistors first. What are these resistors what are the features of this resistors. First of all it is non-dynamical not a dynamic component what does it mean. It means that it is an algebra component and whatever is there in the input co ...
... So now let us look at these primary components one by one, the resistors first. What are these resistors what are the features of this resistors. First of all it is non-dynamical not a dynamic component what does it mean. It means that it is an algebra component and whatever is there in the input co ...
ACM - JNEC
... capacitor in series with the starting winding as shown in fig.4. The capacitor is generally of electrolytic type and is usually mounted on the outside of the motor as a separate unit. The capacitor is designed for extremely short-duty service and when the motor reaches around 79-80% of its full spee ...
... capacitor in series with the starting winding as shown in fig.4. The capacitor is generally of electrolytic type and is usually mounted on the outside of the motor as a separate unit. The capacitor is designed for extremely short-duty service and when the motor reaches around 79-80% of its full spee ...
c-14-dbme-1st-year
... Explain Temperature Coefficient of resistance and solve simple problems on variation of resistance with temperature. Explain the concepts of Work done, Energy expended and Power dissipated in electric circuit and state S.I. Units of Work, Power and Energy Solve simple Domestic electricity bill. Deri ...
... Explain Temperature Coefficient of resistance and solve simple problems on variation of resistance with temperature. Explain the concepts of Work done, Energy expended and Power dissipated in electric circuit and state S.I. Units of Work, Power and Energy Solve simple Domestic electricity bill. Deri ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) ISSN: 2278-1676
... about „keeping the lights ON‟. They designed the power system to withstand outages. The main concern was to prevent the frequency of power system from deviating from 50 Hz after outages. With the development in technology, use of gadgets like computers, arc furnaces, photo copier machines etc. incre ...
... about „keeping the lights ON‟. They designed the power system to withstand outages. The main concern was to prevent the frequency of power system from deviating from 50 Hz after outages. With the development in technology, use of gadgets like computers, arc furnaces, photo copier machines etc. incre ...
Engineering Letters
... Internal diameter and gross length of the stator can be calculated from the product D2L. And a suitable relation is assumed between D and L. For round pole- The ratio of pole arc to pole pitch may be assumed from 0.6 to 0.7 and pole arc may be taken equal to the axial length of the stator core. The ...
... Internal diameter and gross length of the stator can be calculated from the product D2L. And a suitable relation is assumed between D and L. For round pole- The ratio of pole arc to pole pitch may be assumed from 0.6 to 0.7 and pole arc may be taken equal to the axial length of the stator core. The ...
PowerPoint - UCF Physics
... We will always use the CURRENT as the basis for calculations and express voltages with respect to the current. What that means? ...
... We will always use the CURRENT as the basis for calculations and express voltages with respect to the current. What that means? ...
- University of Surrey
... similarity to the Cylindrical Hall Thruster (CHT), is motivated by the need for low power and low cost electric propulsion for the small satellite sector. Two versions of the device are investigated in this study: a design using permanent magnets at high magnetic field strength and a design using el ...
... similarity to the Cylindrical Hall Thruster (CHT), is motivated by the need for low power and low cost electric propulsion for the small satellite sector. Two versions of the device are investigated in this study: a design using permanent magnets at high magnetic field strength and a design using el ...
Understanding Polymer and Hybrid Capacitors Advanced capacitors based on conductive polymers
... the hybrid. Each type has different electrolytic and electrode Hybrid capacitor technology combines the performance benefits of electrolytic and polymer capacitors. ...
... the hybrid. Each type has different electrolytic and electrode Hybrid capacitor technology combines the performance benefits of electrolytic and polymer capacitors. ...
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.