FAKULTI KEJURUTERAAN ELEKTRIK UNIVERSITI
... Wk 3: Fundamentals of rotating machines Principles of rotating machines – cylindrical machines. Motional voltage and electromagnetic force. Basic construction of rotating electric machines. Wk 4 – 7: DC machines Construction, commutator action, armature windings, effect of armature reaction, interpo ...
... Wk 3: Fundamentals of rotating machines Principles of rotating machines – cylindrical machines. Motional voltage and electromagnetic force. Basic construction of rotating electric machines. Wk 4 – 7: DC machines Construction, commutator action, armature windings, effect of armature reaction, interpo ...
Annotated - Electrical and Computer Engineering
... In a transformer energy is transferred from primary to secondary, form of energy (electrical) is unchanged. In a ROTATING ELECTRIC MACHINE (M/C or m/c), electrical energy is converted into mechanical form and vice versa: Electric Motor Electric energy to Mechanical Energy. Electric Generator ...
... In a transformer energy is transferred from primary to secondary, form of energy (electrical) is unchanged. In a ROTATING ELECTRIC MACHINE (M/C or m/c), electrical energy is converted into mechanical form and vice versa: Electric Motor Electric energy to Mechanical Energy. Electric Generator ...
TND6041 - DC Motor Driver Fundamentals
... There are three basic types of BLDC motors: single-phase, 2-phase, and 3-phase. The operating principle in each case is the same. Instead of a mechanical commutator changing the magnetic polarity of the rotor coils, transistors continuously change the phase of the stator coils to keep the motor rota ...
... There are three basic types of BLDC motors: single-phase, 2-phase, and 3-phase. The operating principle in each case is the same. Instead of a mechanical commutator changing the magnetic polarity of the rotor coils, transistors continuously change the phase of the stator coils to keep the motor rota ...
DC Machines - Electrical and Computer Engineering
... Universal Motor’s advantages Compared with other types of single-phase ac motors, the universal motor has several advantages: 1- For a given weight, universal motors produce more power than other types. This is a large advantage for hand-held tools and small appliances, such as drills, saws,mixers, ...
... Universal Motor’s advantages Compared with other types of single-phase ac motors, the universal motor has several advantages: 1- For a given weight, universal motors produce more power than other types. This is a large advantage for hand-held tools and small appliances, such as drills, saws,mixers, ...
the Note
... 1. Batteries and cells are the main source of direct current. These are too expensive to provide large amounts of current. 2. Direct current cannot be transformed. Even when using a DC generator, transformers are less effective than when transforming current from an AC generator. 3. The potential di ...
... 1. Batteries and cells are the main source of direct current. These are too expensive to provide large amounts of current. 2. Direct current cannot be transformed. Even when using a DC generator, transformers are less effective than when transforming current from an AC generator. 3. The potential di ...
Induction Motors
... The use of permanent magnets (PMs) in construction of electrical machines brings the following benefits: no electrical energy is absorbed by the field excitation system and thus there are no excitation losses which means substantial increase in the efficiency, higher torque and/or output power p ...
... The use of permanent magnets (PMs) in construction of electrical machines brings the following benefits: no electrical energy is absorbed by the field excitation system and thus there are no excitation losses which means substantial increase in the efficiency, higher torque and/or output power p ...
Lectures. Direct current machi
... Explain the construction of a DC generator. we know that a DC generator uses electromagnetic induction to convert mechanical energy into electrical energy. it is frequently used in houses and officers but do you know how it is constructed. let's try to understand this. a DC generator consists of a m ...
... Explain the construction of a DC generator. we know that a DC generator uses electromagnetic induction to convert mechanical energy into electrical energy. it is frequently used in houses and officers but do you know how it is constructed. let's try to understand this. a DC generator consists of a m ...
Motors and Actuation
... – Iron rotor “squirrel cage” has electric fields induced into it – Constantly lags slightly behind the changing field, causing torque ...
... – Iron rotor “squirrel cage” has electric fields induced into it – Constantly lags slightly behind the changing field, causing torque ...
Problem 4 - Portal UniMAP
... rotor construction. These are elaborated below: Squirrel cage, (SC) construction: conducting bars usually of aluminium are placed in rotor slots. These are shorted at both ends by conducting rings. In small and medium size cage with rings is die cast in rotor slots. Rings also have projecting fins w ...
... rotor construction. These are elaborated below: Squirrel cage, (SC) construction: conducting bars usually of aluminium are placed in rotor slots. These are shorted at both ends by conducting rings. In small and medium size cage with rings is die cast in rotor slots. Rings also have projecting fins w ...
U3e L16 4-9 Electricity and Magnetism 9
... Electric currents create a magnetic field and magnetic fields induce electric currents. U3e-L16 ...
... Electric currents create a magnetic field and magnetic fields induce electric currents. U3e-L16 ...
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.