Principle Types Of Generator`s
... connected in parallel with armature conductors In shunt wound generators the voltage in the field winding is same as the voltage across the terminal. The field winding has high resistance and more number of turns so that only a part of armature current passes through field winding and the rest pas ...
... connected in parallel with armature conductors In shunt wound generators the voltage in the field winding is same as the voltage across the terminal. The field winding has high resistance and more number of turns so that only a part of armature current passes through field winding and the rest pas ...
PES Instruction Manual - CIS Elektrotechnik GmbH
... tensioning clamps should not be placed side by side and also not on the butt joints. To avoid excessive brush wear it is important, that a smooth track profile is achieved at the joints! If the slip ring joints are not meet satisfyingly, they have to be grinded. Fasten the securing bands and make su ...
... tensioning clamps should not be placed side by side and also not on the butt joints. To avoid excessive brush wear it is important, that a smooth track profile is achieved at the joints! If the slip ring joints are not meet satisfyingly, they have to be grinded. Fasten the securing bands and make su ...
2011/12 - CSM2044 - Electrical Energy Conversion and Transport
... This course employs a theoretical, practical, multidisciplinary approach to provide introductory students with a broad understanding of electrical machines, measurements and control of electric energy. The course is considered as a foundation for the Network Engineering, Modelling and Management mod ...
... This course employs a theoretical, practical, multidisciplinary approach to provide introductory students with a broad understanding of electrical machines, measurements and control of electric energy. The course is considered as a foundation for the Network Engineering, Modelling and Management mod ...
Low Starting Current Motors
... low capacity lines. Use of DOL low starting current design can provide a cost-effective solution removing the need for expensive electronic variable frequency starters or other forms of soft starters. A typical cage induction motor having standard performance will achieve a starting current in the o ...
... low capacity lines. Use of DOL low starting current design can provide a cost-effective solution removing the need for expensive electronic variable frequency starters or other forms of soft starters. A typical cage induction motor having standard performance will achieve a starting current in the o ...
Unit B
... Photo-reactive materials Chemically reactive materials Thermally reactive materials Piezoelectric materials – Crystals create a charge when pushed or pressed. ...
... Photo-reactive materials Chemically reactive materials Thermally reactive materials Piezoelectric materials – Crystals create a charge when pushed or pressed. ...
Magnetic Fields
... start, when the brushes are in contact with the insulation between the two halves of the commutator. In reality, a motor will contain more than one coil, and the commutator will be made so that at least one coil is energised at any one time. Motor speed is generally controlled by adjusting the suppl ...
... start, when the brushes are in contact with the insulation between the two halves of the commutator. In reality, a motor will contain more than one coil, and the commutator will be made so that at least one coil is energised at any one time. Motor speed is generally controlled by adjusting the suppl ...
Lab 10 - Rose
... Slowly increase the field power supply until the dynamometer field current is 0.5 A. d. Increase the dynamometer armature voltage until the speed is close to 1800 RPM. You can use the dynamometer field rheostat to make final speed adjustments. e. Increase the DM-100A generator field current in steps ...
... Slowly increase the field power supply until the dynamometer field current is 0.5 A. d. Increase the dynamometer armature voltage until the speed is close to 1800 RPM. You can use the dynamometer field rheostat to make final speed adjustments. e. Increase the DM-100A generator field current in steps ...
Electricity Worksheet 2 – Voltage, Current and Resistance
... a) What is the current in this circuit? b) Which way will the current flow, clockwise or anticlockwise? (use conventional current, not electron ...
... a) What is the current in this circuit? b) Which way will the current flow, clockwise or anticlockwise? (use conventional current, not electron ...
Electrical Machines
... alternator/motor. • List the methods used to provide the excitation of a synchronous alternator/motor. • List the starting methods of synchronous ...
... alternator/motor. • List the methods used to provide the excitation of a synchronous alternator/motor. • List the starting methods of synchronous ...
f. notes E283C8
... segments is indeed zero until the machine is loaded. When the machine is loaded, the neutral-plane shifts, and the brushes short out commutator segments with a finite voltage across them. The result is a current flow circulating between the shorted segments and large sparks at the brushes when the c ...
... segments is indeed zero until the machine is loaded. When the machine is loaded, the neutral-plane shifts, and the brushes short out commutator segments with a finite voltage across them. The result is a current flow circulating between the shorted segments and large sparks at the brushes when the c ...
ELECTROTECHNOLOGY N3
... (c) Interpoles: It is customary to fit interpoles in all dc motors and generators, other than the very smallest types. These are smaller pole pieces placed between each pair of main field poles, and their purpose is to ensure sparkless commutation at any load within the capacity of the machine. When ...
... (c) Interpoles: It is customary to fit interpoles in all dc motors and generators, other than the very smallest types. These are smaller pole pieces placed between each pair of main field poles, and their purpose is to ensure sparkless commutation at any load within the capacity of the machine. When ...
Electric Drives_MyCourses
... For a dimensioning a motor for a variable load, it is possible to calculate an equivalent constant load or simulate the system ...
... For a dimensioning a motor for a variable load, it is possible to calculate an equivalent constant load or simulate the system ...
permanent magnet synchronous motor
... • They are operated in self controlled mode. • In closed loop control ,current regulated VSI is used. • The inverter is operated to supply motor three phase currents of the magnitude and phase commanded by reference currents isa,isb and isc which generated by a reference current generator. • The sta ...
... • They are operated in self controlled mode. • In closed loop control ,current regulated VSI is used. • The inverter is operated to supply motor three phase currents of the magnitude and phase commanded by reference currents isa,isb and isc which generated by a reference current generator. • The sta ...
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.