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"The alternator is a dynamo designed for the generation of alternating currents. It has collecting rings instead of a communtator so that the current is delivered just as it is generated, and a small direct current dynamo for engergizing its field magnets, the pole-pieces of which are generally very numerous." -Avery 1895

Alternator

"The alternator is a dynamo designed for the generation of alternating currents. It has collecting rings…

"Ring armature of four pole dynamo; diagram of winding and connections, showing direction of the indced currents. the currents in the winding under the upper N and S poles are opposed to each other and flow to the external circuit by the positive brush 1, and back to this half of the armature by the negative brushes 3 and 4...The armature is said to be 'cross connected.' " -Hawkins, 1917

Ring Armature

"Ring armature of four pole dynamo; diagram of winding and connections, showing direction of the indced…

"The dynamo has its field mangets F F magnetized by means of a small current flowing around a shunt circuit." — Hawkins, 1917

Dynamo

"The dynamo has its field mangets F F magnetized by means of a small current flowing around a shunt…

Section of Gray and Davis Lighting Dynamo.

Dynamo

Section of Gray and Davis Lighting Dynamo.

"...in which is shown as electromagnet mounted with its poles in proximity to those of a steel magnet, and connected with a driving-wheel and belt, by which it can be given a rapid rotary motion, so that its poles alternately rotate past those of the steel magnet, producing an alternate reversal of polarity in its core by which an alternating current is generated in its coils." -Atkinson 1903

Dynamo

"...in which is shown as electromagnet mounted with its poles in proximity to those of a steel magnet,…

"If an electromagnet be subsituted for the steel magnet as shown...and the terminals of its coils connected with the brushs as shown each magnet will generate a current in the coils of the other magnet." -Atkinson 1903

Dynamo

"If an electromagnet be subsituted for the steel magnet as shown...and the terminals of its coils connected…

"A shaft runs through the machine from end to end, carrying a pulley, P, at one end, a commutator, c, at the other end, and a wheel armature, R, at the middle. The armature carries eight or more helices of insulated wire, H H, connected in pairs. As the shaft is turned by the action of the belt upon the pulley, the armature and the commutator are turned with it." — Avery, 1895

Brush dynamo

"A shaft runs through the machine from end to end, carrying a pulley, P, at one end, a commutator, c,…

"Compound wound dynamo, used when better automatic regulation of voltage on constant pressure circuits is desired than is possible with the shunt machine." — Hawkins, 1917

Compound wound dynamo

"Compound wound dynamo, used when better automatic regulation of voltage on constant pressure circuits…

"The series and shunt methods of winding [a dynamo] may be combined in the same machine, producing what is called a compound wound dynamo." -Atkinson 1903

Compound Wound Dynamo

"The series and shunt methods of winding [a dynamo] may be combined in the same machine, producing what…

A generator consisting of a coil which rotates between the poles of an electromagnet causing a current to flow in.

Electric Machine for Dynamo

A generator consisting of a coil which rotates between the poles of an electromagnet causing a current…

"Where a motor is connected with the electric circuit of a dynamo...and the armature of the dynamo is rotated by mechanical power in opposition to the electromagnetic force, an electric current is generated, which tranverses the motor and causes its armature to rotate..." -Atkinson 1903

Connected dynamo and motor

"Where a motor is connected with the electric circuit of a dynamo...and the armature of the dynamo is…

"The electromagnet that supplies the flux of force must have a current to excite it. This current is sometimes supplied from an outside source. Such a dynamo is said to be seperately excited." — Avery, 1895

Seperately excited dynamo

"The electromagnet that supplies the flux of force must have a current to excite it. This current is…

"Separately excited dynamo. Current for field excitation is supplied by a second and smaller generator." — Hawkins, 1917

Seperately excited dynamo

"Separately excited dynamo. Current for field excitation is supplied by a second and smaller generator."…

"The electromagnet that supplies the flux of force must have a current to excite it. This current is sometimes supplied from an outside source. Such a dynamo is said to be seperately excited. Often all of the current from the armature is carried around the coils of the field magnet, thus forming a series dynamo." — Avery, 1895

Series dynamo

"The electromagnet that supplies the flux of force must have a current to excite it. This current is…

"Series wound dynamo, used for series aarc lighting, and as a booster for increasing the pressure on a feeder carrying current furnished by some othe generator." — Hawkins, 1917

Series wound dynamo

"Series wound dynamo, used for series aarc lighting, and as a booster for increasing the pressure on…

"...shows especially the construction of the series wound dynamo. The armature consists of a circular magnet mounted between two massibe pole-pieces belonging to the stationary magnet, by which it is partly inclosed, sufficient space being left on each side for it to revolve freely without contact." -Atkinson 1903

Series Wound Dynamo

"...shows especially the construction of the series wound dynamo. The armature consists of a circular…

"The shunt wound dynamo differes from the series wound machine, in that an independent circuit is used for exciting its field magnet." — Hawkins, 1917

Shunt dynamo

"The shunt wound dynamo differes from the series wound machine, in that an independent circuit is used…

"When a dynamo is so constructed that only a smal part of its current is employed to magnetize its field-magnet, it is called shunt wound, because the magnetizing current is diverted from the main circuit through a shunt circuit." -Atkinson 1903

Shunt Wound Dynamo

"When a dynamo is so constructed that only a smal part of its current is employed to magnetize its field-magnet,…

"A shunt-wound dynamo with an adjustable resistance, R." -Avery 1895

Shunt-wound Dynamo

"A shunt-wound dynamo with an adjustable resistance, R." -Avery 1895

Wiring diagram for Gray & Davis dynamo and regulator.

Gray and Davis

Wiring diagram for Gray & Davis dynamo and regulator.

"Modern dynamo with four consequent pole field magnets. In this construction the ring shaped yoke also serves as a frame; the circular form of yoke gives the least chance of magnetic leakage." — Hawkins, 1917

Multi-polar field magnet

"Modern dynamo with four consequent pole field magnets. In this construction the ring shaped yoke also…

"In a magneto the field magnets are permanently magnetized. The strength of the magnet field of a magneto is constant while that of a dynamo varies with the output." — Hawkins, 1917

Magneto

"In a magneto the field magnets are permanently magnetized. The strength of the magnet field of a magneto…

This electric generator is a device that converts mechanical energy to electrical energy. The reverse conversion of electrical energy into mechanical energy is done by a motor.

Power Generator

This electric generator is a device that converts mechanical energy to electrical energy. The reverse…

"Core and edge strip winding for shunt field coils of large multipolar dynamo." -Hawkins, 1917

Winding

"Core and edge strip winding for shunt field coils of large multipolar dynamo." -Hawkins, 1917