1. Replace the six terminals in the motor stator winding external junction box with star connections. From the parallel and tail lines of the star, connect a neutral line as a working zero. This way there are three phases and four wires, three phases and a zero.
2. Excitation capacitor configuration; select the non-polar excitation capacitor, the capacitance calculation method is: motor idle current? Phase voltage )=uf. We simplify the formula as follows: between 5.5 and 7.5uf per kW (determined based on drag speed, fast drag speed can be 5.5uf), for example: 7kw 5.5 = 38.5 (40uf total) total capacity 3, capacity per ? One phase is 40uf, and the capacitor has a voltage resistance of 450-500V. The three capacitors are connected in triangle and connected to the motor terminals (can be connected in parallel to the output linee main).
3. The rotor drag must exceed the rated speed of the motor. For example, the 4 pole motor is 1440 rpm and the drag speed is more than 500 rpm, 2880 is better. The drag speed and capacitor configuration are appropriate, so the capacitor configuration is simply calculated between 5.5 and 7.5.
1. Go to the electronics market and buy a small model airplane motor. It is a DC motor with a built-in permanent magnet and powered by a rechargeable battery or. accumulator battery. The motor shaft should be slightly longer.
2. Make your own windmill. The windmill shaft should be made of plastic or wood and glued to the motor shaft to ensure that there will be no slippage between the motor shaft and the windmill shaft when the windmill turns. .
3. The two terminals of the motor wiringare connected to the small lamp beads. You can see that when the fan rotates, the lamp beads glow slightly.
If you want a bigger one, one needs a bigger motor, preferably with a brush and collector, and the other needs a strong enough windmill to resist greater wind force and drive the motor shaft. Making a wind turbine with a dual-powered motor requires two power systems for the rotor and stator, which is quite complicated and is not recommended.
The working principle is that the operation of the DC motor generator and motor is reversible, especially after the permanent magnet is integrated into the stator, no special excitation winding is required. is required, which can greatly simplify the design. .