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A shunt generator is a type of
A shunt generator is a type of electric generator
In electricity generation, a generator is a device that converts motive power (mechanical energy) or fuel-based power (chemical energy) into electric power for use in an external circuit. Sources of mechanical energy include steam turbines, gas ...
in which field winding
A field coil is an electromagnet used to generate a magnetic field in an electro-magnetic machine, typically a rotating electrical machine such as a motor or generator. It consists of a coil of wire through which a current flows.
In a rotating ...
and armature winding are connected in parallel
Parallel is a geometric term of location which may refer to:
Computing
* Parallel algorithm
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* Parallel Sysplex, a cluster of IBM ...
, and in which the armature supplies both the load current and the field current for the excitation
Excitation, excite, exciting, or excitement may refer to:
* Excitation (magnetic), provided with an electrical generator or alternator
* Excite Ballpark, located in San Jose, California
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* Electron exc ...
(generator is therefore self excited).
Generator field connections
A shunt field (and any series resistor used for adjustment) may be directly connected across the armature terminals in parallel with the load. Where the machine has a series compounding winding, the field may be connected at the armature side (short shunt) or load side (long shunt). The different connections give different voltage regulation characteristics on load. So as it is connected in shunt it has constant characteristics.Characteristic
Current in the field windings of a shunt-wound generator is (approximately) independent of the load current, because currents in parallel branches are independent of each other. Since field current, and therefore field strength, is little affected by load current, the output voltage remains more nearly constant than does the output voltage of a series-wound generator. There will be a small armature voltage drop on the load, which will be reflected in the voltage applied to the shunt field. The output voltage in a DC shunt-wound generator drops slightly as load current increases because of the voltage drop across the armature resistance.Usage
Self-energizing shunt generators were widely used on automobiles after the decline in usage of third-brush generators but before the proliferation of alternators in the 1960's. Shunt generators are always used with regulators that regulate overvoltage and overcurrent, and disconnect the generator at undervoltage.Compound winding
In a shunt-wound generator, output voltage varies inversely with load current. In a series-wound generator, output voltage varies directly with load current. A combination of the two types can overcome the disadvantages of both. This combination of windings is called a compound-wound dc generator.Everyman's Encyclopaedia, 1932, volume 5, page 248See also
*DC motor
A DC motor is any of a class of rotary electrical motors that converts direct current (DC) electrical energy into mechanical energy. The most common types rely on the forces produced by induced magnetic fields due to flowing current in the coil ...
* Excitation (magnetic)
An electric generator or electric motor consists of a rotor spinning in a magnetic field. The magnetic field may be produced by permanent magnets or by field coils. In the case of a machine with field coils, a current must flow in the coils to ge ...
References