Electronics (2001)
... the armature. The field is wound with a few turns of large wire, because it must carry full armature current. • Series motor develops a large amount of turning force (torque), from a standstill. Because of this characteristic, the series DC motor may be used to operate small electric appliances, por ...
... the armature. The field is wound with a few turns of large wire, because it must carry full armature current. • Series motor develops a large amount of turning force (torque), from a standstill. Because of this characteristic, the series DC motor may be used to operate small electric appliances, por ...
Electrical actuation systems
... magnet rotor. Current carrying conductors are fixed and magnet moves. Rotor is ferrite or permanent magnet. The current to the stator coils are electronically switched by transistor in sequence round the coils. Switching being controlled by position of rotors. Hall effect sensors are used ...
... magnet rotor. Current carrying conductors are fixed and magnet moves. Rotor is ferrite or permanent magnet. The current to the stator coils are electronically switched by transistor in sequence round the coils. Switching being controlled by position of rotors. Hall effect sensors are used ...
Generating Electricity
... • a stationary structure, which provides a constant magnetic field, and a set of rotating windings which turn within that field. • Magnetic field may be provided by one or more permanent magnets or by one or more electromagnets, which are usually called field coils. ...
... • a stationary structure, which provides a constant magnetic field, and a set of rotating windings which turn within that field. • Magnetic field may be provided by one or more permanent magnets or by one or more electromagnets, which are usually called field coils. ...
Inductance Motors Generators
... the contacts to the rotating loop are made by a split ring, or commutator. ...
... the contacts to the rotating loop are made by a split ring, or commutator. ...
1- A resistor is a device. It adds resistance to a circuit . BY
... through the small holes in the plastic at each end. Bend the support wires so the rings are just far enough apart for the armature to spin freely. Bend them apart a little and insert the armature into both rings, then bend them back so that they are close to the coil, but not touching it. Insert the ...
... through the small holes in the plastic at each end. Bend the support wires so the rings are just far enough apart for the armature to spin freely. Bend them apart a little and insert the armature into both rings, then bend them back so that they are close to the coil, but not touching it. Insert the ...
who wants to be a millionaire – electricity quiz
... Electric Cooker Hair Dryer Curling Tongs Electric Razor ...
... Electric Cooker Hair Dryer Curling Tongs Electric Razor ...
Electric Drives
... Regenerative braking is not possible since the field current needs to be maintained but it collapses when the rotor current passes through zero and reverses. ...
... Regenerative braking is not possible since the field current needs to be maintained but it collapses when the rotor current passes through zero and reverses. ...
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... electronics. The coils are activated, one phase after the other, by the drive electronics as cued by the signals from the Hall effect sensors, they act as three-phase synchronous motors containing their own variable frequency drive electronics. i. HALL EFFECTS refers to the potential difference (Hal ...
... electronics. The coils are activated, one phase after the other, by the drive electronics as cued by the signals from the Hall effect sensors, they act as three-phase synchronous motors containing their own variable frequency drive electronics. i. HALL EFFECTS refers to the potential difference (Hal ...
WELCOME TO PHYSICS 1103
... •How do electric motors work? •What causes a changing magnetic field in a motor? •How do electric generators work? ...
... •How do electric motors work? •What causes a changing magnetic field in a motor? •How do electric generators work? ...
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.