Dynamo DC generator For Physics

Dynamo DC generator For Physics
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one. use
This machine is a demonstration of the basic structure and working principle of AC-DC generator for the teaching of common sense of physics in primary and secondary schools.
two. Structure
This produces a magnetic field generator that is a permanent magnet rotating armature.
Magnetite material comes with two pairs of boots made of material.
Armature cores made of iron-based powder metallurgy are wound around hundreds of turns of high-strength enamelled copper wire, with two copper rings connected at both ends of the coil. The copper ring is the commutation of busbars and associated equipment. Its shape is a flat one end, the other half is a convex head, the two complementary brass ring raised part is two half-rings, the ends of the commutator is an annular slip ring.
Armature and copper rings are mounted on the rotating shaft and shaft insulation. One end of the shaft is provided with a pulley bearing which is fixed on the pole piece of the metal frame.
Brushes made of a pair of tin bronze plates on a bearing frame can be moved back and forth on the brush slider and used to output DC power when a pair of brushes are pressed against the two half rings. When a pair of brushes are pressed together The two rings are used to output AC.
The armature generator transports the skin by means of a large handwheel and the large cranked wheel can be removed.
The entire device is mounted on the backplane with two terminals on the board and a lampholder with the light bulb.
three. Skills requirements
When the rotor speed of 1600 rev / min, the machine output voltage: no-load voltage of not less than 8V; string 4.8V, 0.3A small bulbs, the load pressure of not less than 5V.
four. usage
The desired output is also AC DC, with brushes placed on either ends or in the middle of the ring. The external circuit board on the access terminal is powered by the base.
When using hand pressure on a wooden base, rotate the wheel evenly and evenly, you can have power output, shaking speed is not too fast, so the output voltage is too high, the lamp burned.
Connector demo ammeter, voltmeter should be installed, do not separate the series ammeter, if necessary, sliding rheostat in series as a load.
Children under five years old. maintenance
Most equipment malfunctions and loose wiring (due to moisture and corrosion). Therefore, if you do not waver, you can check if the line is disconnected from the generator.
Armature and pole piece gap is very small, if the bearing is loose, it is easy to jam armature. The reason for checking and adjusting the pole piece and bearing position this time is that the armature in the pole piece can be flexibly rotated, usually with proper bearing lubrication.
3. Belt after use should be taken to prevent grease and heat should be removed from the pulley, to prevent the belt slipping too loose.
4. Brush terminals and bracket insulation, if the screw loose and short-circuit, should be adjusted.