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A Repulsion motor is a type of electric motor for use on alternating current. It was formerly used as a traction motor for electric trains but has been superseded by other types of motor and is now only of historical interest. Rotating magnetic field as a sum of magnetic vectors from 3 phase coils An electric motor converts electrical energy into mechanical energy. ...
City lights viewed in a motion blurred exposure. ...
A GG1, perhaps the best-known electric locomotive ever built. ...
Construction
The motor has a stator and a rotor but there is no electrical connection between the two and the rotor current is generated by induction. The rotor winding is connected to a commutator which is in contact with a pair of short-circuited brushes which can be moved to change their angular position relative to an imaginary line drawn through the axis of the stator. The motor can be started, stopped and reversed, and the speed can be varied, simply by changing the angular position of the brushes. The stator is the fixed part of a rotating machine. ...
The rotor is the non-stationary part of a rotary electric motor or alternator, which rotates because the wires and magnetic field of the motor are arranged so that a torque is developed about the rotors axis. ...
Electromagnetic induction is the production of an electrical potential difference (or voltage) across a conductor situated in a changing magnetic flux. ...
Conventional continuous current flows from the battery. ...
For alternate meanings see Short circuit (disambiguation) A short circuit (sometimes known as simply a short) is a fault whereby electricity moves through a circuit in an unintended path, usually due to a connection forming where none was expected. ...
In electrical engineering, brushes conduct current between stationary wires and moving parts, most commonly in a rotating shaft. ...
Most commutator motors are limited to about 1,500 volts because higher voltages give rise to a risk of arcing across the commutator. Repulsion motors can be used at higher voltages because the rotor circuit is not electrically connected to the supply. Josephson junction array chip developed by NIST as a standard volt. ...
An electric arc can melt calcium oxide. ...
Types Types of repulsion motor are listed below under the names ot their inventors. It is likely that the different types were developed to match the torque/speed characteristics of the motor as closely as possible to the service it was required to provide. Torque applied via an adjustable end wrench Relationship between force, torque, and momentum vectors in a rotating system In physics, torque (or often called a moment) can informally be thought of as rotational force or angular force which causes a change in rotational motion. ...
Elihu Thomson The Elihu Thomson motor is the original repulsion motor and is described in "Construction" above. Elihu Thomson (March 29, 1853 - March 13, 1937) was an engineer who was instrumental in the founding of major electrical companies in the United States, Britain and France. ...
Deri The Deri motor is similar to the Elihu Thomson type but has two pairs of short-circuited brushes - one fixed and one moveable. This allows very fine control of speed. Miksa Déri (1854 - 1938), was a Hungarian electrical engineer, co-inventor of the transformer and the ZBD model AC electrical generator. ...
Latour-Winter-Eichberg This is the "compensated" repulsion motor devised independently by Latour and by Winter-Eichberg.
There are, again, two pairs of brushes but they are fixed at right angles to each other. One pair is short-circuited while the other pair is fed with variable-voltage alternating current from tappings on the secondary winding of a small transformer. The primary winding of the transformer is in series with the stator winding of the motor. This motor has the same torque/speed characteristics as an ordinary series-wound motor. City lights viewed in a motion blurred exposure. ...
A transformer tap is a connection point along a transformer winding that allows the number of turns to be selected. ...
Three-phase pole-mounted step-down transformer. ...
This article or section does not adequately cite its references or sources. ...
Atkinson The Atkinson motor has two stator coils at right angles to each other. Speed control (by brush-shifting) is possible from 75% below synchronous speed to 10% above. Starting torque is about 2.5 times full-load torque with twice full-load current.
See also Rotating magnetic field as a sum of magnetic vectors from 3 phase coils An electric motor converts electrical energy into mechanical energy. ...
The Southern Railway (SR) gave the designation CP to the fleet of AC electric multiple units used on lines in the Crystal Palace area. ...
The Southern Railway (SR) gave the designation SL to the fleet of AC electric multiple units used on the South London lines. ...
Sources - The Electrical Year Book 1937, published by Emmott and Company Limited, Manchester, England, pp 79-82
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