![P6 Revision Questions Motors and Generators](http://s1.studyres.com/store/data/016492132_1-be7016ef25f8c86191d46cc25ff3e89c-300x300.png)
Brushless DC electric motor
... Schematic for delta and wye winding styles. (This image does not illustrate a BLDC motor's inductive and generator-like properties) BLDC motors can be constructed in several different physical configurations: In the 'conventional' (also known as 'inrunner') configuration, the permanent magnets are m ...
... Schematic for delta and wye winding styles. (This image does not illustrate a BLDC motor's inductive and generator-like properties) BLDC motors can be constructed in several different physical configurations: In the 'conventional' (also known as 'inrunner') configuration, the permanent magnets are m ...
selection of electric motors for aerospace applications
... Stepper Motors. Table 1 shows the most predominant applications for each type of motor. Generally AC Induction Motors are used for constant speed applications where a fixed frequency power source such as 60 Hz or 400 Hz is available in the spacecraft. Typical applications are fans and pumps. Motor c ...
... Stepper Motors. Table 1 shows the most predominant applications for each type of motor. Generally AC Induction Motors are used for constant speed applications where a fixed frequency power source such as 60 Hz or 400 Hz is available in the spacecraft. Typical applications are fans and pumps. Motor c ...
Specifications
... As a motor: to work as a motor, the user can control field and excitation currents depending on the configuration (independent, series, shunt and compound). Thus, apart from assembling the machine, both the velocity and torque of the machine can be controlled. It includes: • Rotor. This element cons ...
... As a motor: to work as a motor, the user can control field and excitation currents depending on the configuration (independent, series, shunt and compound). Thus, apart from assembling the machine, both the velocity and torque of the machine can be controlled. It includes: • Rotor. This element cons ...
motors
... delivers current and controls its direction into the armature coil. Solid brushes provide stationary electrical contact to the moving commutator conducting segments. (Brushes in early motors consisted by bristles of copper wire flexed against the commutator and hence the term brush). Brushes are usu ...
... delivers current and controls its direction into the armature coil. Solid brushes provide stationary electrical contact to the moving commutator conducting segments. (Brushes in early motors consisted by bristles of copper wire flexed against the commutator and hence the term brush). Brushes are usu ...
what is alternating current (ac)?
... a voltage with constant polarity. DC is the kind of electricity made by a battery (with definite positive and negative terminals), or the kind of charge generated by rubbing certain types of materials against each other. As useful and as easy to understand as DC is, it is not the only “kind” of elec ...
... a voltage with constant polarity. DC is the kind of electricity made by a battery (with definite positive and negative terminals), or the kind of charge generated by rubbing certain types of materials against each other. As useful and as easy to understand as DC is, it is not the only “kind” of elec ...
5.8 Induction motor losses and efficiency
... For running, the windings are switched to delta-connection. This method of starting is less expensive than by auto transformer. (Wound Rotor) When starting on load is necessary, a wound rotor induction motor must be used. This is because maximum torque at starting ...
... For running, the windings are switched to delta-connection. This method of starting is less expensive than by auto transformer. (Wound Rotor) When starting on load is necessary, a wound rotor induction motor must be used. This is because maximum torque at starting ...
Word Work File L_987757493
... - Spring resists motion of coil - When force from spring is equal to force from motor, needle is still - Depending on resistance of circuit, different scale is read ...
... - Spring resists motion of coil - When force from spring is equal to force from motor, needle is still - Depending on resistance of circuit, different scale is read ...
Topic 6 - Raymond Junior High School
... flows in the coil, one end of the core becomes a magnetic north pole and the other the south pole. When more coils of wire are wrapped around the iron core, the strength of the magnet increases. Increasing the current also results in a stronger magnet. If the direction of the current is reversed, the ...
... flows in the coil, one end of the core becomes a magnetic north pole and the other the south pole. When more coils of wire are wrapped around the iron core, the strength of the magnet increases. Increasing the current also results in a stronger magnet. If the direction of the current is reversed, the ...
Unit 4 Electrical Principles and Technologies - Topic 6
... flows in the coil, one end of the core becomes a magnetic north pole and the other the south pole. When more coils of wire are wrapped around the iron core, the strength of the magnet increases. Increasing the current also results in a stronger magnet. If the direction of the current is reversed, the ...
... flows in the coil, one end of the core becomes a magnetic north pole and the other the south pole. When more coils of wire are wrapped around the iron core, the strength of the magnet increases. Increasing the current also results in a stronger magnet. If the direction of the current is reversed, the ...
Unit 4 Electrical Principles and Technologies
... flows in the coil, one end of the core becomes a magnetic north pole and the other the south pole. When more coils of wire are wrapped around the iron core, the strength of the magnet increases. Increasing the current also results in a stronger magnet. If the direction of the current is reversed, the ...
... flows in the coil, one end of the core becomes a magnetic north pole and the other the south pole. When more coils of wire are wrapped around the iron core, the strength of the magnet increases. Increasing the current also results in a stronger magnet. If the direction of the current is reversed, the ...
Synchronous Generators
... In the picture above, we have in fact managed to build what is called a 2-pole permanent magnet synchronous motor. The reason why it is called a synchronous motor, is that the magnet in the centre will rotate at a constant speed which is synchronous with (running exactly like the cycle in) the rotat ...
... In the picture above, we have in fact managed to build what is called a 2-pole permanent magnet synchronous motor. The reason why it is called a synchronous motor, is that the magnet in the centre will rotate at a constant speed which is synchronous with (running exactly like the cycle in) the rotat ...
Brush DC Motor Runs Along - Power Transmission Engineering
... It’s the wearing away of the carbon or metal graphite brushes that concerns many. The mechanical contact between the brush and the commutation transfers voltage and current to the armature necessary to generate motor torque and speed. Since the brush wear can vary under different current and speed c ...
... It’s the wearing away of the carbon or metal graphite brushes that concerns many. The mechanical contact between the brush and the commutation transfers voltage and current to the armature necessary to generate motor torque and speed. Since the brush wear can vary under different current and speed c ...
2A. Two similar inductive coils with negligible resistance are wound
... 5B. A 30KVA, 2400/120 V, 50Hz transformer has high voltage winding resistance of 4.5 Ω and leakage reactance of 10 Ω. The corresponding values on low voltage winding are 0.01 Ω and 0.025 Ω. The iron losses are 1.5 KW. Calculate (a) equivalent impedance referred to high voltage ...
... 5B. A 30KVA, 2400/120 V, 50Hz transformer has high voltage winding resistance of 4.5 Ω and leakage reactance of 10 Ω. The corresponding values on low voltage winding are 0.01 Ω and 0.025 Ω. The iron losses are 1.5 KW. Calculate (a) equivalent impedance referred to high voltage ...
Fast Flashover Identification Methodology on Brushed DC
... approach with new commutators construction techniques is presented in [20]. [21] summarized the impacts on commutation of the insertion of power electronics in DC motor drives, and [22] highlighted the correct application of collector rings on DC machines. Quantitative and qualitative analyses of ge ...
... approach with new commutators construction techniques is presented in [20]. [21] summarized the impacts on commutation of the insertion of power electronics in DC motor drives, and [22] highlighted the correct application of collector rings on DC machines. Quantitative and qualitative analyses of ge ...
Electrical_Machines_Lab_Upgrading_Proposal_Fall_2009
... The setups and kits should have all the necessary safety and protection features such as safety covers for rotational parts, short circuit protection, overload current protection, over voltage protection, and under-voltage protection etc. ...
... The setups and kits should have all the necessary safety and protection features such as safety covers for rotational parts, short circuit protection, overload current protection, over voltage protection, and under-voltage protection etc. ...
B - Weebly
... (ii) Should sparking occur, they would damage the commutator less than when Cu brushes are used. But some of their minor disadvantages are: (a) Due to their high contact resistance a loss of approximately 2 volts is caused. Hence, they are not much suitable for small machines where this voltage form ...
... (ii) Should sparking occur, they would damage the commutator less than when Cu brushes are used. But some of their minor disadvantages are: (a) Due to their high contact resistance a loss of approximately 2 volts is caused. Hence, they are not much suitable for small machines where this voltage form ...
Commutator (electric)
![](https://commons.wikimedia.org/wiki/Special:FilePath/Universal_motor_commutator.jpg?width=300)
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.