Elimination of the motor neutral voltage
... The neutral voltage is not required in the proposed method, only the three motor terminal voltages need to be detected. Elimination of the fixed phase shift circuit: The proposed specific average line to line voltage inherently lags 30 electric degrees compared with the phase back EMF. Moreover, ...
... The neutral voltage is not required in the proposed method, only the three motor terminal voltages need to be detected. Elimination of the fixed phase shift circuit: The proposed specific average line to line voltage inherently lags 30 electric degrees compared with the phase back EMF. Moreover, ...
Spin dependent tunneling devices fabricated for magnetic random
... using a magnetic keeper layer on top of the drive coils. It is noted that the latching functionality will not be affected by the drifting of the switching thresholds. As long as the two remanent states are achieved, the latch cell will function properly. Furthermore, when pursuing large memory array ...
... using a magnetic keeper layer on top of the drive coils. It is noted that the latching functionality will not be affected by the drifting of the switching thresholds. As long as the two remanent states are achieved, the latch cell will function properly. Furthermore, when pursuing large memory array ...
TB62262FTAG
... shutdown (TSD) circuitry. It is advisable to keep the maximum current below a certain level so that the maximum junction temperature, Tj (MAX), will not exceed 120°C. Caution) Absolute maximum ratings The absolute maximum ratings of a semiconductor device are a set of ratings that must not be exceed ...
... shutdown (TSD) circuitry. It is advisable to keep the maximum current below a certain level so that the maximum junction temperature, Tj (MAX), will not exceed 120°C. Caution) Absolute maximum ratings The absolute maximum ratings of a semiconductor device are a set of ratings that must not be exceed ...
EEE- Interview Question with Answers
... Electrical interview question:Tell me in detail about c.t. and p.t. ?(Company:reliance) Answer:The term C.T means current transformer,and the term P.T means potential transformer.In circuit where measurements of high voltage and high current is involved they are used there.Particularly when a measur ...
... Electrical interview question:Tell me in detail about c.t. and p.t. ?(Company:reliance) Answer:The term C.T means current transformer,and the term P.T means potential transformer.In circuit where measurements of high voltage and high current is involved they are used there.Particularly when a measur ...
transformers
... generator. • 1885 – William Stanley developed the fist commercially used practical device while working for Westinghouse Electric Company in US. ΤΕΙ Κρήτης - Ηλεκτρικές Μηχανές Συλλιγνάκης Γιάννης ...
... generator. • 1885 – William Stanley developed the fist commercially used practical device while working for Westinghouse Electric Company in US. ΤΕΙ Κρήτης - Ηλεκτρικές Μηχανές Συλλιγνάκης Γιάννης ...
D N IAGNOSTIC EWS
... nominal current for the testing purposes especially in “field” conditions. The conventional method of testing CT’s is to apply voltage to the secondary and measure the induced primary voltage. The comparison of the voltages gives the CT turns ratio. ...
... nominal current for the testing purposes especially in “field” conditions. The conventional method of testing CT’s is to apply voltage to the secondary and measure the induced primary voltage. The comparison of the voltages gives the CT turns ratio. ...
Improved Algorithms of Direct Torque Control Method
... in Fig. 2a. It means that a given inverter voltage vector causes the current vector components to change as shown in Fig. 2c. For example, voltage vector 010 (K 010 ) causes an increase of current component isq (torque) and a decrease of current component isd (flux). The influence of the other vecto ...
... in Fig. 2a. It means that a given inverter voltage vector causes the current vector components to change as shown in Fig. 2c. For example, voltage vector 010 (K 010 ) causes an increase of current component isq (torque) and a decrease of current component isd (flux). The influence of the other vecto ...
Single Phase Transformer© Nafees Ahmed By
... (2) Copper Losses: Also know as variable losses because they depend on load current. R1 = Resistance of primary winding R2 = Resistance of secondary winding I1 = Full load current in primary winding I2 = Full load current in secondary winding Full load copper losses ...
... (2) Copper Losses: Also know as variable losses because they depend on load current. R1 = Resistance of primary winding R2 = Resistance of secondary winding I1 = Full load current in primary winding I2 = Full load current in secondary winding Full load copper losses ...
balanced three–phase circuits
... : internal impedance of each phase in generator : line impedance ...
... : internal impedance of each phase in generator : line impedance ...
B0509
... electromagnetic torque is exactly balanced by the mechanical torque. If in some generator the balance between the electromagnetic and mechanical torque is disturbed, due to disturbances in the system, then this will lead to oscillations in the rotor angle. Rotor angle stability is further classified ...
... electromagnetic torque is exactly balanced by the mechanical torque. If in some generator the balance between the electromagnetic and mechanical torque is disturbed, due to disturbances in the system, then this will lead to oscillations in the rotor angle. Rotor angle stability is further classified ...
S285-80-1
... or closed status of the switch or interrupter mechanism selected via the SCADA Motor Select Contacts. CLOSE CONTACT: Dry contact which initiates closing the switch or interrupter mechanism selected via the Motor Select contacts. A momentary contact closure between terminal 21 and terminal 22 on the ...
... or closed status of the switch or interrupter mechanism selected via the SCADA Motor Select Contacts. CLOSE CONTACT: Dry contact which initiates closing the switch or interrupter mechanism selected via the Motor Select contacts. A momentary contact closure between terminal 21 and terminal 22 on the ...
A General Approach for Brushed DC Machines Simulation Using a
... COUPLED MODEL 3.1. Introduction Strong coupling models combine field equations with those of the electrical circuit in the same differential system [23]. Time stepping finite element are wildly used for the study of brush less DC motors [24], induction motor [25–28], or current transformers [29]. Ho ...
... COUPLED MODEL 3.1. Introduction Strong coupling models combine field equations with those of the electrical circuit in the same differential system [23]. Time stepping finite element are wildly used for the study of brush less DC motors [24], induction motor [25–28], or current transformers [29]. Ho ...
Design and Performance of a High Temperature Superconducting
... N IMPORTANT quality index of electric machine is the power density: it is known that axial flux machines tend to have a higher power density than the radial machines. As a result, they are used more and more in applications where the power density is a critical issue: renewable energy production[1], ...
... N IMPORTANT quality index of electric machine is the power density: it is known that axial flux machines tend to have a higher power density than the radial machines. As a result, they are used more and more in applications where the power density is a critical issue: renewable energy production[1], ...
Aalborg Universitet PMSM Drive Systems
... into account the discrete nature of inverters but temporary offsets and poor responses to load torque variations are still issues in speed control. A load torque estimator is proposed in this paper in order to further improve dynamic behavior. It compensates the load torque influence on the speed co ...
... into account the discrete nature of inverters but temporary offsets and poor responses to load torque variations are still issues in speed control. A load torque estimator is proposed in this paper in order to further improve dynamic behavior. It compensates the load torque influence on the speed co ...
Mechanical_measurement.pdf
... The actual measurement of rpm internally in the instrument can be performed by a number of methods including: o Mechanical: The spinning shaft goes through a gear box that rotates a springloaded dial. o Electric generator: A small DC motor is used “backwards” as a generator. Output voltage is prop ...
... The actual measurement of rpm internally in the instrument can be performed by a number of methods including: o Mechanical: The spinning shaft goes through a gear box that rotates a springloaded dial. o Electric generator: A small DC motor is used “backwards” as a generator. Output voltage is prop ...
Lecture-07
... number of coils of more number of turns, reactance voltage proportional to (turn)2 is high. This decreases the quality of commutation or leads to sparking commutation. Hence a single layer winding is not generally used in DC machines. However it is much used in alternators and induction motors where ...
... number of coils of more number of turns, reactance voltage proportional to (turn)2 is high. This decreases the quality of commutation or leads to sparking commutation. Hence a single layer winding is not generally used in DC machines. However it is much used in alternators and induction motors where ...
Induction motor
An induction or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor therefore does not require mechanical commutation, separate-excitation or self-excitation for all or part of the energy transferred from stator to rotor, as in universal, DC and large synchronous motors. An induction motor's rotor can be either wound type or squirrel-cage type.Three-phase squirrel-cage induction motors are widely used in industrial drives because they are rugged, reliable and economical. Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans. Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives (VFDs) in variable-speed service. VFDs offer especially important energy savings opportunities for existing and prospective induction motors in variable-torque centrifugal fan, pump and compressor load applications. Squirrel cage induction motors are very widely used in both fixed-speed and variable-frequency drive (VFD) applications. Variable voltage and variable frequency drives are also used in variable-speed service.