Stator Core

 The stator steel core is the part used to wind the armature coil. The stator steel core is made of thin steel sheet. stacked by reason to design The stator steel core to look like this It is to reduce losses due to hysteresis (Hysteresis Loss) or the loss of magnetic lines created by the coil. with eddy currents in the steel core (Eddy Current Loss) and the steel core also It is a thin soft iron which contains silicon compounds. When they are stacked together, they are made possible. Steel core with greater strength In addition, each steel plate has grooves. air for cooling There are 3 types of stator core grooves which are

• Wide – Open Type Slot
• Semi-Closed Type Slot
• Closed Groove (Wholly Closed Type Slot)

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Rotor

 A rotating float with a winding embedded around the rotor axis. by the rotor will produce from a dense silicon sheet with an insulating barrier In order to create a eddy current which the electric current is obtained from the exciter, the rotor can be divided into two types.

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Salient – ​​Pole Type

 Salient – ​​Pole Type rotor is used in low speed generators. or medium-speed generators such as generators that use upstream power as water turbines of various dams

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Smooth – Cylindrical Type

 Smooth (Cylindrical Type) rotors are used in generators powered by turbine or gas turbines with high rotational speeds of approximately 1,500 rpm and 3,000 rpm. The rotor is a sheet of steel sheet stacked in a long cylinder shape. They are smaller in diameter than the standing pole rotor. The smooth pole rotor is more balanced than the extended pole type and reduces power loss. because of the friction of the wind and centrifugal force to escape the center while rotating is driven at the speed itself

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Damper Winding

 Damper coil will look like a copper bar which is embedded at the surface area The face of the rotating magnetic pole They are short-circuited to the copper rings on both sides of the rotor. The damper windings prevent vibration or oscillation when the generator speed is uneven.

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Exciter

 Parts that produce and supply DC power to coils Alternator Magnetic Field Wire where Exeter will be installed. in the same shaft position as the generator However, large generators It uses a batteryless exciter or a Brushless Generator for convenience. in maintenance compared to the use of slippings and carbon brushes In addition, the system excitation complete magnetic coil There is still no need to use an external power source to stimulate it. Instead, the pilot exciter is mounted in the shaft position of the rotor. which is a small 3-phase alternator with a rotating magnetic pole Permanent Magnet

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Generator from bike dynamo

 Objective
to study the transformation of mechanical energy into electrical energy using a bicycle dynamo

Theory
A dynamo is a type of generator that can convert mechanical energy into electrical energy by Michael Faraday. “Inductive current is caused by a change in the magnetic field that passes through a coil.” The dynamo consists of a coil of conductors and a permanent magnet.

Bike dynamo
This is because bicycles do not have lights like a motorcycle or a car with a battery. and from the principle of converting mechanical energy into electrical energy of dynamo therefore can be adapted to bicycles Because when cycling, it will give mechanical energy and then go to spin a dynamo that has a magnet inside. This causes a change in the magnetic field through the coil and an electric current is induced in the coil conductor. According to Michael Faraday's principle, and make any electrical device or light bulb connected to this dynamo shine. The electric current depends on the rotation speed of the spinning. notice the brightness of the light

Experimental equipment
1. 1 bicycle dynamo
2. The spinning wheel connects the belt to the dynamo head.
3. Light bulb with on-off switch
4. Electrical wires connect the dynamo, electric lamp and switch in a circuit.
5. Plug jack with plug

Experimental method

1. Plug the power jack from the bicycle dynamo into the plug that connects to the light bulb and switch as shown in Figure 4.
2. Turn on the power switch, use 1 lamp, then turn the hand wheel, gradually increasing the speed of rotation. and observe the brightness of the lamp and record the results
3. Repeat the experiment in step 2, but turn on the switch of 2 lamps and 3 lamps respectively.
4. Record the results and summarize the results of the experiment.

Summary of experimental results

The rotation speed of the wheel is related to the electric current (the faster it spins, the more current. making it noticeable that the light bulb is brighter)
light bulb brightness In addition to changing with speed in rotation It also changes according to the number of incandescent lamps used, that is, if one light is switched on, the light is brighter than the 2 light switches on, and two light bulbs are switched on, the light is brighter than the 3 light switches on. even more when the rotation speed is constant)

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