Modeling of Saturation Due to Main and Leakage Flux
... used in connection with dynamic equivalent-circuit models do not take this phenomenon into account. In this paper, explicit functions for modeling this mutual saturation are proposed. These functions are physically reasonable, they are easy to fit, and the number of their parameters is small. The pr ...
... used in connection with dynamic equivalent-circuit models do not take this phenomenon into account. In this paper, explicit functions for modeling this mutual saturation are proposed. These functions are physically reasonable, they are easy to fit, and the number of their parameters is small. The pr ...
Class-A Trip
... winding creates a magnetic flux wave in the air gap which rotates in opposite direction to that of rotor synchronous speed. This flux induces currents in the rotor body, wedges, retaining rings at twice the line frequency. Heating occurs in these areas and the resulting temperatures depend upon the ...
... winding creates a magnetic flux wave in the air gap which rotates in opposite direction to that of rotor synchronous speed. This flux induces currents in the rotor body, wedges, retaining rings at twice the line frequency. Heating occurs in these areas and the resulting temperatures depend upon the ...
Technical Definitions
... OPERATING CHARACTERISTICS. Pickup, nonpickup, hold and dropout, voltage or current. DROPOUT VALUE, MEASURED. As the current or voltage on an operated relay is decreased, the value at which all contacts restore to their unoperated positions. DROPOUT VALUE, SPECIFIED. As the current or voltage on an o ...
... OPERATING CHARACTERISTICS. Pickup, nonpickup, hold and dropout, voltage or current. DROPOUT VALUE, MEASURED. As the current or voltage on an operated relay is decreased, the value at which all contacts restore to their unoperated positions. DROPOUT VALUE, SPECIFIED. As the current or voltage on an o ...
Design of a Permanent-Magnet Synchronous Generator for a 2 MW
... Energy crisis and environmental pollution caused by fossil fuel, have led many countries to make effective use of wind energy for electric power generation. The horizontal-axis wind turbines-due to great heights from the ground level-are good variants to generate electricity at high power levels [1] ...
... Energy crisis and environmental pollution caused by fossil fuel, have led many countries to make effective use of wind energy for electric power generation. The horizontal-axis wind turbines-due to great heights from the ground level-are good variants to generate electricity at high power levels [1] ...
PI3426832691
... braking, fast reversal and constant speed independent of load changes are all desirable properties of a drive system. This requires a fast-acting and accurate torque control in the low speed region [1]. All those properties are obtained with vector controlled induction machines (Leonhard, 1985). The ...
... braking, fast reversal and constant speed independent of load changes are all desirable properties of a drive system. This requires a fast-acting and accurate torque control in the low speed region [1]. All those properties are obtained with vector controlled induction machines (Leonhard, 1985). The ...
Application Note
... A consequence of the motor current re-circulation is that the motor current is almost constant (effectively filtered by the inductance of the motor). Typically the inductance of a motor is few milli-Henry while the internal resistance is at least 100 milli-Ohm, so the time constant T = L/R is in at ...
... A consequence of the motor current re-circulation is that the motor current is almost constant (effectively filtered by the inductance of the motor). Typically the inductance of a motor is few milli-Henry while the internal resistance is at least 100 milli-Ohm, so the time constant T = L/R is in at ...
Russian Regulators: Part VI for the Nippon-Denso 770
... • Two Rectifier Diodes Connected to each Stator Lead • Six Diodes used to rectify the AC stator voltage to DC Output Voltage • Full-Wave Rectification: Diodes Redirect both Positive and Negative Polarity AC Voltage to Produce DC Voltage ...
... • Two Rectifier Diodes Connected to each Stator Lead • Six Diodes used to rectify the AC stator voltage to DC Output Voltage • Full-Wave Rectification: Diodes Redirect both Positive and Negative Polarity AC Voltage to Produce DC Voltage ...
An approach to sensorless operation of the
... the appropriate stator current references. This method, however, suffers at low speeds where integrator drift is a problem. Furthermore, estimation accuracy is highly sensitive to variations in the stator resistance, which is known to be temperature dependent. A technique that monitors the third har ...
... the appropriate stator current references. This method, however, suffers at low speeds where integrator drift is a problem. Furthermore, estimation accuracy is highly sensitive to variations in the stator resistance, which is known to be temperature dependent. A technique that monitors the third har ...
615-4740 (45-075) Induction Kit
... INDUCTANCE: depends upon the number of turns in a coil wound around an iron or ferrite core. The inductive effect or “strength” is measured in a scaled called the Henry. INDUCTION: means the creating of a voltage in a wire by means of exposing a coil of wire to a magnetic field, often from another c ...
... INDUCTANCE: depends upon the number of turns in a coil wound around an iron or ferrite core. The inductive effect or “strength” is measured in a scaled called the Henry. INDUCTION: means the creating of a voltage in a wire by means of exposing a coil of wire to a magnetic field, often from another c ...
Efficiency Improvement of 3 Phase Induction Motor
... armature and field windings are placed orthogonal to each other but in ac motor this is not there, so always there is a interaction between the stator current and rotor torque. In the graph, 850 sampling instants are taken for motor starting condition, motor reaches its rated speed after 850 samplin ...
... armature and field windings are placed orthogonal to each other but in ac motor this is not there, so always there is a interaction between the stator current and rotor torque. In the graph, 850 sampling instants are taken for motor starting condition, motor reaches its rated speed after 850 samplin ...
24-DC Generators Part 2
... Full-load voltage is higher than no-load voltage Useful when connected to a long transmission line (to compensate for the voltage drop) Compound generators are usually over-compound See text for more details and comparison of generator types (Figure 5.32) ...
... Full-load voltage is higher than no-load voltage Useful when connected to a long transmission line (to compensate for the voltage drop) Compound generators are usually over-compound See text for more details and comparison of generator types (Figure 5.32) ...
Commutator (electric)
A commutator is the moving part of a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. It consists of a cylinder composed of multiple metal contact segments on the rotating armature of the machine. The commutator is one component of a motor; there are also two or more stationary electrical contacts called ""brushes"" made of a soft conductor like carbon press against the commutator, making sliding contact with successive segments of the commutator as it rotates. The windings (coils of wire) on the armature are connected to the commutator segments. Commutators are used in direct current (DC) machines: dynamos (DC generators) and many DC motors as well as universal motors. In a motor the commutator applies electric current to the windings. By reversing the current direction in the rotating windings each half turn, a steady rotating force (torque) is produced. In a generator the commutator picks off the current generated in the windings, reversing the direction of the current with each half turn, serving as a mechanical rectifier to convert the alternating current from the windings to unidirectional direct current in the external load circuit. The first direct current commutator-type machine, the dynamo, was built by Hippolyte Pixii in 1832, based on a suggestion by André-Marie Ampère. Commutators are relatively inefficient, and also require periodic maintenance such as brush replacement. Therefore, commutated machines are declining in use, being replaced by alternating current (AC) machines, and in recent years by brushless DC motors which use semiconductor switches.