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unit-2: dc motor
... 11. Derive an expression for the power developed per phase of a synchronous motor. 12. Derive an expression for the maximum torque developed by the synchronous motor. ...
... 11. Derive an expression for the power developed per phase of a synchronous motor. 12. Derive an expression for the maximum torque developed by the synchronous motor. ...
PWM Speed Controller
... Some circuits you may see sample the current going through the main power MOSFET by placing a much lower power MOSFET in parallel with it. There is a circuit on the 4QD site which does this here. This works OK, but the problem is the actual limiting current is dependant on the value of Rds(on) of th ...
... Some circuits you may see sample the current going through the main power MOSFET by placing a much lower power MOSFET in parallel with it. There is a circuit on the 4QD site which does this here. This works OK, but the problem is the actual limiting current is dependant on the value of Rds(on) of th ...
Eddy Current Losses in Transformer Windings and Circuit
... between the two windings. With uniform current distribution at low frequency, note how the field builds uniformly within each conductor according to Faraday's law, staying constant between the conductors. The energy density in the field goes up with the square of the field strength, as shown below t ...
... between the two windings. With uniform current distribution at low frequency, note how the field builds uniformly within each conductor according to Faraday's law, staying constant between the conductors. The energy density in the field goes up with the square of the field strength, as shown below t ...
Behavior of three-phase induction motors with variable
... Three-phase induction motors are widely used in industry with sinusoidal and pulse-width modulation 共PWM兲 supplies for variable speed drives. Unfortunately, losses in inverter-fed machines are always greater than in those operating under sinusoidal voltage supplies. In some cases this requires derat ...
... Three-phase induction motors are widely used in industry with sinusoidal and pulse-width modulation 共PWM兲 supplies for variable speed drives. Unfortunately, losses in inverter-fed machines are always greater than in those operating under sinusoidal voltage supplies. In some cases this requires derat ...
Beakman`s Motor - Rensselaer Polytechnic Institute
... instrumentation issues and because it a very good example of a system that is both electrical and mechanical. It is also used in Mechatronics. There is some excellent background information and some construction hints at the website http://fly.hiwaay.net/~palmer/motor.html, which is also listed in t ...
... instrumentation issues and because it a very good example of a system that is both electrical and mechanical. It is also used in Mechatronics. There is some excellent background information and some construction hints at the website http://fly.hiwaay.net/~palmer/motor.html, which is also listed in t ...
A Luenberger-sliding mode observer with rotor
... speed when the rotor time constant is kept to the original value, while the speed error is below 1% in the transient condition and around 0.1% at steady state. When the rotor time constant changes, the error grows slightly, by 1%. In the steady state, the error is less than 1% (Figures 5 and 6). The ...
... speed when the rotor time constant is kept to the original value, while the speed error is below 1% in the transient condition and around 0.1% at steady state. When the rotor time constant changes, the error grows slightly, by 1%. In the steady state, the error is less than 1% (Figures 5 and 6). The ...
Brushless DC Motor Fundamentals Application Note
... coil to an AC current, as shown in Figure 9(a). As current flows through the commutator through the armature windings, the electromagnetic field repels the nearby magnets with the same polarity, and causes the winging to turn to the attracting magnets of opposite polarity. As the armature turns, the ...
... coil to an AC current, as shown in Figure 9(a). As current flows through the commutator through the armature windings, the electromagnetic field repels the nearby magnets with the same polarity, and causes the winging to turn to the attracting magnets of opposite polarity. As the armature turns, the ...
Lab 13
... 1. Discuss some of the limitations placed on the number of parallel branches that can be added. Is there a limit since the gates effectively do not draw any current? ...
... 1. Discuss some of the limitations placed on the number of parallel branches that can be added. Is there a limit since the gates effectively do not draw any current? ...
generator protection
... Quite often, a generator is connected to grid using a Y transformer. The - winding on the generator side, traps the zero sequence current from flowing through the phase winding. However, positive and negative sequence currents will find their way into stator winding. Positive sequence currents c ...
... Quite often, a generator is connected to grid using a Y transformer. The - winding on the generator side, traps the zero sequence current from flowing through the phase winding. However, positive and negative sequence currents will find their way into stator winding. Positive sequence currents c ...
Improved Universal Motor Drive
... TRIACS. This widespread solution leads to a cheap electronic controller board but has some drawbacks. In particular the high peak to peak current gives poor motor efficiency and the consequential high brush temperature leads to limited motor lifetime. When operating in DC mode, significant improveme ...
... TRIACS. This widespread solution leads to a cheap electronic controller board but has some drawbacks. In particular the high peak to peak current gives poor motor efficiency and the consequential high brush temperature leads to limited motor lifetime. When operating in DC mode, significant improveme ...
FE Torque Analysis of a Shaded
... It is very important to emphasise that the knowledge of the exact torque value at each operating mode of the motor and, in particular, the whole static torque characteristic is crucial for performance assessment of the motor behaviour. One of the most extensively used numerical methods for torque ca ...
... It is very important to emphasise that the knowledge of the exact torque value at each operating mode of the motor and, in particular, the whole static torque characteristic is crucial for performance assessment of the motor behaviour. One of the most extensively used numerical methods for torque ca ...
AC induction - final notes
... - Volt/hertz control usually applied to maintain torque while speed is varied. - voltage supply are obtained from 3-phase inverter or cycloconverters - as for very large power applications (locomotives , cement mills) cycloconverters are used. - As the frequency reduced, β decreases, thus the slip a ...
... - Volt/hertz control usually applied to maintain torque while speed is varied. - voltage supply are obtained from 3-phase inverter or cycloconverters - as for very large power applications (locomotives , cement mills) cycloconverters are used. - As the frequency reduced, β decreases, thus the slip a ...
Speed Control of High-Speed BLDC with Pulse Amplitude
... For the 12-slot motor, the slots/pole is 3, and the coils are full-pitched, which maximizes the width of the back-emf. In the 6-slot motor, the slots/pole is 1.5, and the coil span used is 1 because of which the width of the back-emf waveform is smaller. This effect can also be achieved by short-pit ...
... For the 12-slot motor, the slots/pole is 3, and the coils are full-pitched, which maximizes the width of the back-emf. In the 6-slot motor, the slots/pole is 1.5, and the coil span used is 1 because of which the width of the back-emf waveform is smaller. This effect can also be achieved by short-pit ...
PFC/JA-90-42 Innovative Design Option for Internal Coils* L. Bromberg
... mechanical and/or electrical breaks used to sever the coils. Once in sections, the parts can be removed. A problem with' ...
... mechanical and/or electrical breaks used to sever the coils. Once in sections, the parts can be removed. A problem with' ...
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.