Fundamentals of transformer design
... load current while the secondary voltage would be zero because of the short-circuit. The primary voltage would be small and the flux F would likewise be small. At full load the input voltage would be 0,05 to 0,1 of the rated voltage. The core loss is approximately proportional to the square of the f ...
... load current while the secondary voltage would be zero because of the short-circuit. The primary voltage would be small and the flux F would likewise be small. At full load the input voltage would be 0,05 to 0,1 of the rated voltage. The core loss is approximately proportional to the square of the f ...
UNIT 5 PPT
... ◦ ATTENUATOR - Control the amount of power level in a fixed amount, variable amount or in a series of fixed steps from the from the microwave source to the wavemeter. ◦ WAVEMETER - Used to select / measure resonant cavity frequencies by having a plunger move in and out of the cavity thus causes the ...
... ◦ ATTENUATOR - Control the amount of power level in a fixed amount, variable amount or in a series of fixed steps from the from the microwave source to the wavemeter. ◦ WAVEMETER - Used to select / measure resonant cavity frequencies by having a plunger move in and out of the cavity thus causes the ...
A Novel Universal Sensor Concept for Survivable PMSM Drives Yao
... This paper proposes the implementation of a novel universal sensor for position and current estimation in a PMSM. Search coils are mounted around stator teeth of each phase. Due to its ability to achieve position and current estimation without being effected by stator resistance variation, it improv ...
... This paper proposes the implementation of a novel universal sensor for position and current estimation in a PMSM. Search coils are mounted around stator teeth of each phase. Due to its ability to achieve position and current estimation without being effected by stator resistance variation, it improv ...
A Development of Acoustic Energy Transfer System
... system such as in aerospace, biomedical, multisensors and robotics applications. Recently, various technologies of CET systems are developed and investigated. These technologies include the current technology of inductive power transfer (IPT), capacitive power transfer (CPT), and optical coupling en ...
... system such as in aerospace, biomedical, multisensors and robotics applications. Recently, various technologies of CET systems are developed and investigated. These technologies include the current technology of inductive power transfer (IPT), capacitive power transfer (CPT), and optical coupling en ...
04st_q
... (ii) Find the r.m.s. current passing through the tweeter. Hence, calculate the average power consumption of the tweeter when the note is being played. (3 marks) (b) A low-pitch note of frequency 80 Hz is also amplified to a r.m.s. voltage of 4 V and the output is fed to the tweeter circuit in Figure ...
... (ii) Find the r.m.s. current passing through the tweeter. Hence, calculate the average power consumption of the tweeter when the note is being played. (3 marks) (b) A low-pitch note of frequency 80 Hz is also amplified to a r.m.s. voltage of 4 V and the output is fed to the tweeter circuit in Figure ...
Illumination Utilization of Electrical Energ 6TH SEMESTER
... by means of low range voltmeters or for energizing the potential coils of wattmeter and energy meters. These types of transformers are also used in relays and protection schemes. ...
... by means of low range voltmeters or for energizing the potential coils of wattmeter and energy meters. These types of transformers are also used in relays and protection schemes. ...
Questions - Science @ St John`s
... (b) Radiation from the Sun which is not absorbed is reflected. For water, the amount of solar radiation absorbed (taken in) is 94%. (i) Calculate the percentage of solar radiation reflected by water. ...
... (b) Radiation from the Sun which is not absorbed is reflected. For water, the amount of solar radiation absorbed (taken in) is 94%. (i) Calculate the percentage of solar radiation reflected by water. ...
A batteryless thermoelectric energy-harvesting interface circuit with
... thermoelectric generators (TEG’s) [1] is a convenient means to supply power to body-worn electronics and industrial sensors. Using TEG’s for body-wearable applications limits the output voltage to 50mV for temperature differences of 12K usually found between the body and ambience. Several existing s ...
... thermoelectric generators (TEG’s) [1] is a convenient means to supply power to body-worn electronics and industrial sensors. Using TEG’s for body-wearable applications limits the output voltage to 50mV for temperature differences of 12K usually found between the body and ambience. Several existing s ...
05 May 2012 MGB Tachometer Circuit (please report errors to Terry
... compensation was not perfect, perhaps because British engineers did not anticipate very high desert temperatures. If operating in this environment please contact Tom Hayden for suggestions on improving the accuracy over a wider temperature range. Note that when a trigger from the ignition system beg ...
... compensation was not perfect, perhaps because British engineers did not anticipate very high desert temperatures. If operating in this environment please contact Tom Hayden for suggestions on improving the accuracy over a wider temperature range. Note that when a trigger from the ignition system beg ...
Resonant inductive coupling
Resonant inductive coupling or electrodynamic induction is the near field wireless transmission of electrical energy between two magnetically coupled coils that are part of resonant circuits tuned to resonate at the same frequency. This process occurs in a resonant transformer, an electrical component which consists of two high Q coils wound on the same core with capacitors connected across the windings to make two coupled LC circuits. Resonant transformers are widely used in radio circuits as bandpass filters, and in switching power supplies. Resonant inductive coupling is also being used in wireless power systems. Here the two LC circuits are in different devices; a transmitter coil in one device transmits electric power across an intervening space to a resonant receiver coil in another device. This technology is being developed for powering and charging portable devices such as cellphones and tablet computers at a distance, without being tethered to an outlet.Resonant transfer works by making a coil ring with an oscillating current. This generates an oscillating magnetic field. Because the coil is highly resonant, any energy placed in the coil dies away relatively slowly over very many cycles; but if a second coil is brought near it, the coil can pick up most of the energy before it is lost, even if it is some distance away. The fields used are predominately non-radiative, near fields (sometimes called evanescent waves), as all hardware is kept well within the 1/4 wavelength distance they radiate little energy from the transmitter to infinity.One of the applications of the resonant transformer is for the CCFL inverter. Another application of the resonant transformer is to couple between stages of a superheterodyne receiver, where the selectivity of the receiver is provided by tuned transformers in the intermediate-frequency amplifiers. The Tesla coil is a resonant transformer circuit used to generate very high voltages, and is able to provide much higher current than high voltage electrostatic machines such as the Van de Graaff generator. Resonant energy transfer is the operating principle behind proposed short range (up to 2 metre) wireless electricity systems such as WiTricity or Rezence and systems that have already been deployed, such as Qi power transfer, passive RFID tags and contactless smart cards.