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Repulsion motor
 
 
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A repulsion motor is a type of electric motor
Electric motor

An electric motor uses electrical energy to produce mechanical energy, nearly always by the interaction of magnetic fields and current-carrying conductors....
 for use on alternating current
Alternating current

In alternating current the movement of electric charge periodically reverses direction. An electric charge would for instance move forward, then backward, then forward, then backward, over and over again....
. It was formerly used as a traction motor
Traction motor

A traction motor is a type of electric motor used to power the driving wheels of a vehicle such as a railroad locomotive, electrical Multiple unit train , a tram, or an automobile....
 for electric train
Electric train

Electric train may refer to:* Electric multiple unit* Electric locomotive...
s but has been superseded by other types of motors and is now only of historical interest.

motor has a stator
Stator

The stator is the stationary part of a rotordynamics system, such as in an electric generator or electric motorDepending on the configuration of a spinning electromotive device the stator may act as the field magnet, interacting with the armature to create motion, or it may act as the armature, receiving its influence from moving...
 and a rotor
Rotor (electric)

The rotor is the non-stationary part of a rotary electric motor, electric generator or alternator, which rotates because the wires and magnetic field of the motor are arranged so that a torque is developed about the rotor's axis....
 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
Commutator (electric)

A commutator is an electricity switch that periodically reverses the Current direction in an electric motor or electrical generator. A commutator is a common feature of direct current rotating machines....
 which is in contact with a pair of short-circuited
Short circuit

A short circuit in an electrical circuit that allows a Electric current along a different path from the one intended.The electrical opposite of a short circuit is an "open circuit", which is an infinite resistance between two nodes....
 brushes
Brush (electric)

A brush is a device which conducts current between stationary wires and moving parts, most commonly in a rotating shaft. Typical applications include electric motors, alternators and electric generators....
 which can be moved to change their angular position relative to an imaginary line drawn through the axis of the stator.






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Encyclopedia


A repulsion motor is a type of electric motor
Electric motor

An electric motor uses electrical energy to produce mechanical energy, nearly always by the interaction of magnetic fields and current-carrying conductors....
 for use on alternating current
Alternating current

In alternating current the movement of electric charge periodically reverses direction. An electric charge would for instance move forward, then backward, then forward, then backward, over and over again....
. It was formerly used as a traction motor
Traction motor

A traction motor is a type of electric motor used to power the driving wheels of a vehicle such as a railroad locomotive, electrical Multiple unit train , a tram, or an automobile....
 for electric train
Electric train

Electric train may refer to:* Electric multiple unit* Electric locomotive...
s but has been superseded by other types of motors and is now only of historical interest.

Construction

The motor has a stator
Stator

The stator is the stationary part of a rotordynamics system, such as in an electric generator or electric motorDepending on the configuration of a spinning electromotive device the stator may act as the field magnet, interacting with the armature to create motion, or it may act as the armature, receiving its influence from moving...
 and a rotor
Rotor (electric)

The rotor is the non-stationary part of a rotary electric motor, electric generator or alternator, which rotates because the wires and magnetic field of the motor are arranged so that a torque is developed about the rotor's axis....
 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
Commutator (electric)

A commutator is an electricity switch that periodically reverses the Current direction in an electric motor or electrical generator. A commutator is a common feature of direct current rotating machines....
 which is in contact with a pair of short-circuited
Short circuit

A short circuit in an electrical circuit that allows a Electric current along a different path from the one intended.The electrical opposite of a short circuit is an "open circuit", which is an infinite resistance between two nodes....
 brushes
Brush (electric)

A brush is a device which conducts current between stationary wires and moving parts, most commonly in a rotating shaft. Typical applications include electric motors, alternators and electric generators....
 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.

Idle Short-circuit Position for
clockwise operation		 Position for
counterclockwise operation


Most commutator motors are limited to about 1,500 volt
Volt

The volt is the SI SI derived unit of electric potential difference or electromotive force, commonly known as voltage. It is named in honor of the Lombard physicist Alessandro Volta , who invented the voltaic pile, possibly the first chemical battery ....
s 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.

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
Torque

Torque is the tendency of a force to rotate an object about an axis . Just as a force is a push or a pull, a torque can be thought of as a twist....
/speed characteristics of the motor as closely as possible to the service it was required to provide.

Elihu Thomson


The Elihu Thomson
Elihu Thomson

Elihu Thomson was an electrical engineering and inventor who was instrumental in the founding of major electricity companies in the United States, United Kingdom and France....
 motor is the original repulsion motor and is described in "Construction" above.

Deri


The Deri
Miksa Déri

Miksa D?ri , was a Hungary electrical engineer, co-inventor of the closed iron core transformer and the ZBD model Alternating current electrical generator....
 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.

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
Alternating current

In alternating current the movement of electric charge periodically reverses direction. An electric charge would for instance move forward, then backward, then forward, then backward, over and over again....
 from tappings
Tap (transformer)

A transformer tap is a connection point along a transformer winding that allows a certain number of turns to be selected. By this means, a transformer with a variable turns ratio is produced, enabling voltage regulation of the output....
 on the secondary winding of a small transformer
Transformer

A transformer is a device that transfers electrical energy from one electrical network to another through inductive coupling conductors — the transformer's coils or "windings"....
. The primary winding of the transformer is in series
Series and parallel circuits

In electronics, components of an electronic circuit can be connected in series or in parallel. Components connected in series are connected along a single path, so the same electric current flows through all of the components....
 with the stator winding of the motor. This motor has the same torque/speed characteristics as an ordinary series-wound motor.

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
Synchronization (alternating current)

Synchronization is an important concept in relation to alternating current....
 speed to 10% above. Starting torque is about 2.5 times full-load torque with twice full-load current.

See also

  • Electric_motor#AC_Motors
    Electric motor

    An electric motor uses electrical energy to produce mechanical energy, nearly always by the interaction of magnetic fields and current-carrying conductors....
  • SR Class CP
    SR Class CP

    The Southern Railway gave the designation CP to the fleet of AC electric multiple units used on the former London, Brighton and South Coast Railway lines in the Crystal Palace area....
     electric multiple unit
  • SR Class SL
    SR Class SL

    The Southern Railway gave the designation SL to the fleet of AC electric multiple units used on the former London, Brighton and South Coast Railway South London Line....
     electric multiple unit

Sources


  • The Electrical Year Book 1937, published by Emmott and Company Limited, Manchester, England, pp 79-82