Step 1: Assemble gearbox
Select 344.2: 1 Transmission ratio, which is the largest prisoner of prisoners ER and lowest speed.
You can purchase a set of gearboxes or use gearboxes from an old remote control. If the speed is fast, you can reduce the power supply voltage of the motor at any time.
Step 2: Create a bracket for the bird
The stent is mainly made of 2 mm hard lines. It is 10 cm long, 10 cm wide, 16 cm high.
Step 3: Creating a bird's body
The height of the bird is 30 cm, mainly made of 2 mm hard lines.
After the bird is made, it is connected to the gear with a line of 0.9 mm.
Try to make the bird shape as small as possible, but make sure it touches the wire terminal. Use 1.5 mm wire instead of 2 mm wire will reduce the body weight of the bird, and increase the actual work of this mobile sculpture, because small DC motors may not be able to move the bird's large weight.
Step 4: Connect the bird to the bracket
The bird is connected to the bracket with a 0.9 mm wire.
Step 5: Connect the electronic terminal
Connect the front and back terminals. The latter terminal is bent into a semicircular shape from a wire of 0.9 mm (please observe the image carefully).
The 2 mm wire is then connected to the front end terminal.
Step 6: Production circuit
This circuit is a trigger circuit control relator.
"Bird" is the front terminal.
"Bird" is the rear terminal connection.
The circuit shown is shown to display two voltage control switches. In fact, there are two mechanical switches (you are connected in the previous step), and the voltage control switch is only included in the circuit because the PSPICE software does not allow the use of mechanical components, and can only simulate electronic or circuitry.
It may not take 2.2 ohmic resistors. This resistance is used if the relay has high inductance and is turned on for a long time until it is short. This may burn the power transistor. If there is no power transistor, there are several NPN transistors to connect all three terminals (the base is coupled to the base, the collector is connected to the collector, and the emitter is connected to the emitter). This method is used for redundancy and reduces the power consumption of each transistor.
Does not include a heat sink on a transistor. Since the transistor saturation, the power consumption is very low. However, power consumption depends on the relay. If the relay consumes a large current, a heat sink should be included.
The diffusion model of the radiator is shown in the circuit simulation. You can use any of the two. In two models, circuit simulation is used for model temperature. If there is no cooling fan and there is no housing, the corresponding heat resistance is zero. You must assume that the device may heat in the box. Power consumption is current, temperature is potential, and the resistance is thermal resistance.
This is how you choose a radiator resistance and a radiator resistance:
Power = VCE (collector emitter voltage) * IC (collective electrode current) during saturation
VCE (collector emitter voltage) = 0.2 volts (approximately). IC = (power supply -0.2 v) / relay resistance (when opening)
You can connect the current table to check how much current consumes when the relay is opened.
Removal resistance + housing to radiator resistance = (maximum transistor junction temperature - maximum room temperature or ambient temperature) / power consumption (Wat) - The thermal resistance of the outer casing
The maximum transistor is tie temperature and the thermal resistance of the outer casing in the specifications of the transistor.
The electrical resistance of the heat sink depends on the heat transfer compound, the hot gasket material, and the pressure mounting.
Therefore, the higher the power consumption, the lower the heat dissipation power. Heat heat sink resistance. The larger radiator will have lower heat resistance.
A nice choice is that if you don't understand these formulas, select a radiator with a lower heat resistance.
Step 7: Install the relay
Relay does not have to be a high current relay. In fact, it must be a low current relay. However, remember that if the mechanical problem (such as a gearbox problem) is stopped, the motor will absorb a large current. That's why I decided not to use the transistor to drive the motor. However, there is an H-bridge transistor circuit and the H-bridge resistor circuit available to drive the motor.
Step 8: Connect the power
The project is now completed. Read more
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