EE 328 _lect_04
... Note : A decrease in the field circuit resistance will cause the shunt generator to build up faster to a higher voltage, the generator will not build up if the field resistance is greater than or equal the critical resistance RF2 RC ...
... Note : A decrease in the field circuit resistance will cause the shunt generator to build up faster to a higher voltage, the generator will not build up if the field resistance is greater than or equal the critical resistance RF2 RC ...
Chapter 20-21
... Direct current versus alternating current – AC vs DC : What’s the difference? Direct current is electrical current which comes from a battery which supplies a constant flow of electricity in one direction. Alternating current is electrical current which comes from a generator. As the electromagnet ...
... Direct current versus alternating current – AC vs DC : What’s the difference? Direct current is electrical current which comes from a battery which supplies a constant flow of electricity in one direction. Alternating current is electrical current which comes from a generator. As the electromagnet ...
IM ppt File
... Also find short circuit current ISN corresponding to normal supply voltage. With this data, the circle diagram can be drawn as follows. • With suitable scale, raw vector OA with length corresponding to Io at an angle Ö0 from the vertical axis. Draw a horizontal line AB. • Draw OS equal to Isn at an ...
... Also find short circuit current ISN corresponding to normal supply voltage. With this data, the circle diagram can be drawn as follows. • With suitable scale, raw vector OA with length corresponding to Io at an angle Ö0 from the vertical axis. Draw a horizontal line AB. • Draw OS equal to Isn at an ...
TEMPLATE FOR EXAMINATION PAPERS
... 2) a) State two basic methods of controlling the speed of a d.c. shunt motor, other than the pulse-width-modulated armature-current chopper system or the WardLeonard method. ...
... 2) a) State two basic methods of controlling the speed of a d.c. shunt motor, other than the pulse-width-modulated armature-current chopper system or the WardLeonard method. ...
technical data - shaft grounding
... This design can be used only for unidirectional operation. For bi-directional operation alternative solutions have to be used. ...
... This design can be used only for unidirectional operation. For bi-directional operation alternative solutions have to be used. ...
Induction motor control
... Electrical power converted into mechanical power (developed power in the rotor). Pm = Total air gap power transferred across the air gap for a three phase induction motor (Pag) – copper loss in the rotor (Pcur) ...
... Electrical power converted into mechanical power (developed power in the rotor). Pm = Total air gap power transferred across the air gap for a three phase induction motor (Pag) – copper loss in the rotor (Pcur) ...
Lab 3
... 1. Identify the DC synchronous machines of the alternator. Set the machines on the metal plate and couple, the axes together through the double-head rubber coupler. Use the guard around the coupling head. Spin the machine shaft manually to ensure the alignment. Turn the plate screw tight to preserve ...
... 1. Identify the DC synchronous machines of the alternator. Set the machines on the metal plate and couple, the axes together through the double-head rubber coupler. Use the guard around the coupling head. Spin the machine shaft manually to ensure the alignment. Turn the plate screw tight to preserve ...
Motor Types
... permanent magnets, a stator with windings and commutation that is performed electronically. Typically three Hall sensors are used to detect the rotor position and commutation is performed based on Hall sensor inputs. The motor is driven by rectangular or trapezoidal voltage strokes coupled with the ...
... permanent magnets, a stator with windings and commutation that is performed electronically. Typically three Hall sensors are used to detect the rotor position and commutation is performed based on Hall sensor inputs. The motor is driven by rectangular or trapezoidal voltage strokes coupled with the ...
Experiment 2 - Binus Repository
... Micro-Electro-Mechanical Systems (MEMS) is the integration of mechanical elements, sensors, actuators, and electronics on a common silicon substrate through the utilization of microfabrication technology. While the electronics are fabricated using integrated circuit (IC) process sequences (e.g., CMO ...
... Micro-Electro-Mechanical Systems (MEMS) is the integration of mechanical elements, sensors, actuators, and electronics on a common silicon substrate through the utilization of microfabrication technology. While the electronics are fabricated using integrated circuit (IC) process sequences (e.g., CMO ...
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.