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Power-producing component of an electric machine
In electrical engineering, an armature is the winding (or set of windings) of an electric machine which carries alternating current. The armature windings
Armature_(electrical)
Device converting mechanical into electrical energy
a linear alternator or a rotating armature with a stationary magnetic field is used. Although any AC electrical generator might be called an alternator
Alternator
Topics referred to by the same term
virtual characters Armature (electrical), one of the two principal electrical components of an electromechanical machine Armature (sculpture), framework
Armature
Book by Nehemiah Hawkins
The Hawkins Electrical Guide was a technical engineering book written by Nehemiah Hawkins, first published in 1914, intended to explain the highly complex
Hawkins_Electrical_Guide
Device for changing direction of current
of multiple metal contact segments on the rotating armature of the machine. Two or more electrical contacts called "brushes" made of a soft conductive
Commutator_(electric)
Electricity-producing machine
or electrically skilled enough to maintain these more complex machines. The de Méritens magneto generator illustrated shows the 'ring wound' armature. As
Magneto
operating electric motors by progressive shifting; Field Magnet; Armature; Electrical conversion; Economical; Transmission of energy; Simple construction;
List_of_Nikola_Tesla_patents
Electrical generator that produces direct current
innovation of using a ring armature, was an improvement on earlier dynamos and helped usher in development of large-scale electrical devices. Earlier designs
Gramme_machine
Swedish inventor and industrialist (1853–1943)
started experimenting with Armature (electrical) and in 1919 opened a new factory, Triplex, which manufactured electrical pendulums and various devices
Johan_Petter_Johansson
Device that converts other energy to electrical energy
generator (PMSG). Armature: The power-producing component of an electrical machine. In a generator, alternator, or dynamo, the armature windings generate
Electric_generator
Resultant magnetic field
induce a current. The flux generated by the armature current reacts upon the field poles and the armature is set in rotation in a definite direction.
Rotating_magnetic_field
Electrical generator that produces direct current with the use of a commutator
A dynamo is an electrical generator that creates direct current using a commutator, and uses self-powering electromagnets for the stator field rather than
Dynamo
pulses. The incoming pulse activated an electromagnet that moved an armature. Electrical contacts attached to it closed and completed a secondary circuit
Electrical telegraphy in the United Kingdom
Electrical_telegraphy_in_the_United_Kingdom
Machine that converts electrical energy into mechanical energy
cylinder composed of multiple metal contact segments on the armature. Two or more electrical contacts called brushes made of a soft conductive material
Electric_motor
Electrical device primarily used for testing a motor for shorted coils
preheating or baking armatures and rotors. Hubert, Charles I. (2003). Operating, Testing, and Preventive Maintenance of Electrical Power Apparatus. Upper
Growler_(electrical_device)
Device put on or in the ears that plays sound
produces sound. Balanced armature transducer A balanced armature is a sound transducer design primarily intended to increase the electrical efficiency of the
Headphones
Type of electric motor
An armature controlled DC motor is a direct current (DC) motor that uses a permanent magnet driven by the armature coils only. A motor is an actuator
Armature-controlled_DC_motor
as an elementary alternator, consisting of a single wire loop called an armature with each end being attached to slip-rings and arranged so as to revolve
Sources_of_electrical_energy
Electromechanical function
V curve (also spelled as V-curve) is the graph showing the relation of armature current as a function of field current in synchronous motors keeping the
V_curve
Non-stationary part of a rotary electric motor
{\displaystyle n_{slip}=n_{s}-n_{m}} f r = s f e {\displaystyle f_{r}=sf_{e}} Armature (electrical engineering) - any "rotor" that carries some form of alternating
Rotor_(electric)
Device for eliminating circulating currents in parallel armature windings
electrical machines whose armature windings are arranged in two or more parallel portions. When the parallel portions of an armature are not perfectly equal
Equaliser_(electrical)
Hand-cranked electrical generator
magneto is a hand-cranked electrical generator that uses permanent magnets to produce alternating current from a rotating armature. In early telegraphy, magnetos
Telephone_magneto
Early system for transmitting text over wires
Cooke and Wheatstone telegraph, invented in 1837. The second category are armature systems, in which the current activates a telegraph sounder that makes
Electrical_telegraph
Alternating current electrical generator
AC output and armature rotation Armature at 0 degrees. Armature at 90 degrees. Armature at 180 degrees. Armature at 270 degrees. Armature at 360 degrees
Single-phase_generator
Slot-guided powered model car
competition, racing organizations, standards, etc., see slot car racing. Armature (electrical engineering) Inline; Pancake; Sidewinder; Anglewinder–types of slot
Slot_car
Internally commutated electric motor
"Estimation of speed, armature temperature and resistance in brushed DC machines using a CFNN based on BFGS BP". Turkish Journal of Electrical Engineering & Computer
Brushed_DC_electric_motor
Motor which works on direct current
be controlled by changing the voltage applied to the armature. Variable resistance in the armature circuit or field circuit allows speed control. Modern
DC_motor
Devices in automobiles to charge the battery and power the electrical system
Generator regulators require a cutout relay to isolate the output coils (the armature) from the battery at low speed; that isolation is provided by the alternator
Alternator_(automotive)
Electrically operated switch
magnetic flux, a movable iron armature, and one or more sets of contacts (there are two contacts in the relay pictured). The armature is hinged to the yoke and
Relay
converter Arc furnace Arc lamp Arc welder Argon Arithmetic mean Armature (electrical engineering) Artificial heart Artificial intelligence Artificial
Index of electrical engineering articles
Index_of_electrical_engineering_articles
Electromagnetic projectile launcher
projectile. The armature may be an integral part of the projectile, but it may also be configured to accelerate a separate, electrically isolated or non-conducting
Railgun
Indian inventor and engineer (1893–1974)
Industry, Coimbatore Diesel Products and Coimbatore Engineering, Coimbatore Armature Winding Works, and UMS Radio Company. In 1944, Naidu retired from active
G._D._Naidu
Electrical equipment
current is induced into the stationary armature. Synchronous generators are the majority source of commercial electrical energy. They are commonly used to
Permanent magnet synchronous generator
Permanent_magnet_synchronous_generator
Electron flow-powered mechanical device
the current on the electrical side and/or to help create the magnetic field. The current-carrying winding is called the armature winding while the magnetic
Electric_machine
timeline tables list the discoveries and inventions in the history of electrical and electronics engineering. 1843: Watchmaker Alexander Bain develops
Timeline of electrical and electronics engineering
Timeline_of_electrical_and_electronics_engineering
intense heat produced by an electric arc. armature That part of an electrical machine that converts electrical energy to mechanical energy (or vice versa)
Glossary of electrical and electronics engineering
Glossary_of_electrical_and_electronics_engineering
Constants in electrical engineering
Theory of Synchronous Generators" the two reactions theory that divided the armature magnetomotive force (MMF) into two components: the direct axis component
Reactances of synchronous machines
Reactances_of_synchronous_machines
besides additional losses. For most alternators, the stator acts as the armature. Practical alternators have a short-pitched and distributed windings to
Winding_factor
Production of voltage by a varying magnetic field
text are from the public domain book: Hawkins Electrical Guide, Volume 1, Chapter 19: Theory of the Armature, pp. 270–273, Copyright 1917 by Theo. Audel
Electromagnetic_induction
Electric motor for vehicle propulsion
essentially the same device but operates on alternating current. Since both the armature and field current reverse at the same time, the behavior of the motor is
Traction_motor
Electrical component
convert electrical energy to mechanical energy. Often a machine will have one winding through which passes most of the power of the machine (the "armature")
Electromagnetic_coil
Element used in an AC magnetic circuit
is one or more turns of electrical conductor (usually copper or aluminum) located in the face of the magnet assembly or armature of an alternating current
Shading_coil
Type of electric motor
inductively coupled, and placed at ninety electrical degrees to the main field axis. These reduce the reactance of the armature, and improve the commutation. One
Universal_motor
Device to convert electrical energy to mechanical
around a movable steel or iron slug (termed the armature). The coil is shaped such that the armature can be moved in and out of the space in the center
Solenoid_(engineering)
Isolating sections of electrical systems
energizes a coil that produces a magnetic field that pulls on an electrically isolated armature with switching contacts. The switching contacts may be normally
Galvanic_isolation
Voltage that opposes the change in current that induced it
that occurs in electric motors where there is relative motion between the armature and the magnetic field produced by the motor's field coils or permanent
Counter-electromotive_force
DC generator. In a DC shunt generator, the voltage induced across the armature, Va, is directly proportional to the flux acting across it. The flux in
Critical_field_resistance
Drop in voltage in an electrical power supply system
may draw more current due to the reduced back-EMF developed at the lower armature speed. Unless the motor has ample cooling capacity, it may eventually overheat
Brownout_(electricity)
Early AC generator designed by William Morris Mordey
machine was published in Rankin Kennedy's Electrical Installations (1903), illustrating the disc armature and surrounding spider poles. The Mordey Victoria
Mordey_alternator
Serbian-American engineer and inventor (1856–1943)
ports, pushing a piston up and down that was attached to an armature. The magnetic armature vibrated up and down at high speed, producing an alternating
Nikola_Tesla
Door locking device
or maglock is a locking device that consists of an electromagnet and an armature plate. The principle behind an electromagnetic lock is the use of electromagnetism
Electromagnetic_lock
required to produce rated armature voltage at the open circuit to the field current required to produce the rated armature current at short circuit. This
Short circuit ratio (synchronous generator)
Short_circuit_ratio_(synchronous_generator)
Manufacture of electromagnetic coils
possible, typically 1–2 mm. For most AC generators, the stator acts as the armature, and the rotor acts as the field magnet. The rotor and stator are both
Coil_winding_technology
Type of AC motor
armature reaction. The V curve of a synchronous machine shows armature current as a function of field current. With increasing field current armature
Synchronous_motor
Type of AC electric motor
at the brush terminals which will produce current in the armature. The current in the armature circuit will produce its own magnetic field, with North
Repulsion_motor
Type of electric motor
excitation and a wound armature. The permanent magnets can either be stationary or rotating; interior or exterior to the armature for a radial flux machine
Permanent_magnet_motor
field coils and the armature winding are carried on the fixed stator. The rotor is a simple toothed wheel, with no windings or electrical components. In the
Flux_switching_alternator
Linear accelerator
parallel electrodes to accelerate a "sliding short" armature. However, in a plasma railgun, the armature and ejected projectile consists of plasma, or hot
Plasma_railgun
Clutch that operates electrically but transmits torque mechanically
becomes magnetized and sets up a magnetic loop that attracts the armature. The armature is pulled against the rotor and a frictional force is generated
Electromagnetic_clutch
Type of direct current motor
corresponding brush (of the opposite electrical polarity) 135-degrees from the initial brush. In the design of the Lynch motor armature, the iron laminations are
Lynch_motor
German electrical engineer, inventor and industrialist (1816–1892)
discoverers History of electrical engineering Timeline of the electric motor Bow collector Dielectric barrier discharge Double-T armature Dynamo Electric bell
Werner_von_Siemens
DC motor speed control system
V_{g}^{f}=R_{g}^{f}I_{g}^{f}+L_{g}^{f}I_{g}^{f}} Eq. 2: The equation of electrical equilibrium in the armature circuit − G g f a I g f W g r + ( R g a + R m a ) I a +
Ward_Leonard_control
Form of telegraph receiver which converted incoming electrical signals into sounds
the armature, pulling it down to the electromagnet, resulting in a "click" sound. When the current ended, the counterweight pulled the armature back
Telegraph_sounder
Electric generator that powers its own field winding
electric generator in which field winding and armature winding are connected in parallel, and in which the armature supplies both the load current and the field
Shunt_generator
Use of the traction motors as generators when slowing a vehicle
the armature connected to an electrical circuit with either a power supply (motor) or power receptor (generator). Since the role of the electrical/mechanical
Dynamic_braking
"Milestones:First Studies on Ring Armature for Direct-Current Dynamos, 1860-1863". ETHW. Institute of Electrical and Electronics Engineers (IEEE). 2018-04-12
Timeline of the electric motor
Timeline_of_the_electric_motor
Group of phyllosilicate minerals
synthetic mica – Borosilicate and quartz glass, mica, sealing, level gauges, armature – Continental Trade". www.continentaltrade.com.pl. Archived from the original
Mica
Electrical transmission without physical connection
the transmission of electrical energy without wires as a physical link. In a wireless power transmission system, an electrically powered transmitter device
Wireless_power_transfer
being joined. Steinmeier, David. "Magnet Wire Fusing of Automotive Motor Armatures and Solenoids" (PDF). microjoining.com. Retrieved 6 August 2025. v t e
Fusing_(manufacturing)
Artillery using coils to electromagnetically propel a projectile
non-ferromagnetic projectiles, of materials such as aluminium or copper, with the armature of the projectile acting as an electromagnet with internal current induced
Coilgun
Multi-turn railgun that reduces current by a factor equal to the number of turns
a straight power rail, and a helical stator coil in the barrel and an armature coil inside the projectile. One brush mounted on the projectile conducted
Helical_railgun
system 1860–1871 – Maxwell's equations 1860–1863 – First Studies on Ring Armature for Direct-Current Dynamos 1861 – Transcontinental Telegraph 1861–1867
List_of_IEEE_Milestones
Hungarian electrical engineer (1860-1939)
Ottó Titusz Bláthy (11 August 1860 – 26 September 1939) was a Hungarian electrical engineer. During his career he became the co-inventor of the modern electric
Ottó_Bláthy
Device for converting electrical power to another form
A motor–generator (an MG set) is a device for converting electrical power to another form. Motor–generator sets are used to convert frequency, voltage
Motor–generator
Waterproof insulating compound
appeared to be in bad condition it could be removed by warming up the armature near a flame and replacing it. Chatterton's Compound was used in the manufacture
Chatterton's_compound
Device to slow or stop vehicles
single face armature. When the brake is engaged, the permanent magnets create magnetic lines of flux, which can in turn attract the armature to the brake
Electromagnetic_brake
American electrical engineer and manufacturer
Schuyler Skaats Wheeler (May 17, 1860 – April 20, 1923) was an American electrical engineer and manufacturer who invented the electric fan, an electric elevator
Schuyler_Wheeler
Electromechanical valve
mechanism varies from linear action, plunger-type actuators to pivoted-armature actuators and rocker actuators. The valve can use a two-port design to
Solenoid_valve
Rapid-fire railgun launcher
The CCEMG launcher had an overall mass of only 273 kg despite its solid armature and its structurally stiff makeup, which resulted from incorporating a
Cannon-Caliber Electromagnetic Gun launcher
Cannon-Caliber_Electromagnetic_Gun_launcher
Type of transformer
iron armature (A). After a time, the magnetic attraction overcomes the armature's spring force, and the armature begins to move. When the armature has
Induction_coil
Mechanical bell that functions by means of an electromagnet
coil of insulated wire around an iron bar, which attract an iron strip armature with a clapper. The most widely used form is the interrupter bell, which
Electric_bell
steel lamination for all stator, armature and rotor products. This shielding material separates the rotor's electrically conductive winding from its body
Slot_insulation
Engineer (1862–1919)
in modern units. The machine had a stationary, ring-shaped, three-phase armature and a rotating ‘internal-pole magnet’ with four wound salient poles, which
Mikhail_Dolivo-Dobrovolsky
Type of AC electric motor
magnetic field of the stator winding. An induction motor therefore needs no electrical connections to the rotor. Three-phase squirrel-cage induction motors are
Induction_motor
Bar made from iron or steel, which is placed across the poles of a permanent magnet
A magnet keeper, also known historically as an armature, is a bar made from magnetically soft iron or steel, which is placed across the poles of a permanent
Magnet_keeper
Graphical representation of energy flows in physical systems
through, and between physical dynamical systems including those in the electrical, mechanical, hydraulic, thermal and chemical domains. It is used to model
Bond_graph
Steam-powered electric generator
series of ports, pushing a piston up and down that was attached to an armature, causing it to vibrate up and down at high speed, producing electricity
Tesla's_oscillator
Machinery used to adjust conditions on the electric power transmission grid
change in I a {\displaystyle I_{a}} with increase in load. The phase of armature current varies with field excitation. The current has larger values for
Synchronous_condenser
Electronic component distributor
was over, Avnet focused on buying and selling surplus electronic and electrical parts. In 1955, Avnet Electronic Supply Company was incorporated with
Avnet
Electric motor
electric motor or electric generator where both the field magnet windings and armature windings are separately connected to equipment outside the machine. By
Doubly_fed_electric_machine
British electrical engineer
two levels. First, the iron-free armature of his disc alternator produced very low self-induction - the electrical property that caused conventional
William_Morris_Mordey
Simple electric-to-mechanical energy converter
motor was an early form of electric motor, also known as the Revolving Armature Engine. It has similarities to both the synchronous motor and the contemporary
Mouse_mill_motor
Device to trip a circuit breaker when a fault is detected
currents. Often the measuring relay will trigger auxiliary telephone-type armature relays. In a large installation of electromechanical relays, it would be
Protective_relay
Electric motor with only two poles to its stationary field
gaps and narrow pole pieces that gave only a limited flux through the armature. These fields were usually horseshoe-shaped, with either permanent horseshoe
Bipolar_electric_motor
Class of American electric locomotives
voltage to the motor, thus increasing the current through the motor's armature, which is necessary for increasing its torque and thus increasing motor
Pennsylvania Railroad class GG1
Pennsylvania_Railroad_class_GG1
{\displaystyle \alpha } .[clarification needed] "Armature Reaction in Synchronous Motor". EEEguide – Online Electrical and Electronics Learning Site. 5 January
Zero_power_factor_curve
Characteristic of an electrical generator
voltage), the generator is constrained by the heat dissipation in the armature (stator for large generators). The heating is proportional to the sum of
Capability_curve
Generation of a magnetic field by an electric current
regulated to remove the effect of increasing armature current causing increased voltage drop in the armature winding conductors. In a system with multiple
Excitation_(magnetic)
Control panel using electrical patch cords
energized at the same time, the relay armature would not move. If only one magnet was energized, the armature would move and touch one of two contacts
Plugboard
Constants describing characteristics of electrical motors
I_{\text{a}}} is the armature current of the machine (SI unit: ampere). K T {\displaystyle K_{\text{T}}} is primarily used to calculate the armature current for
Motor_constants
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