This is a three-phase alternator. Use a multimeter to measure the resistance of the four terminals. You can distinguish which one is the neutral line (the red test lead is connected to the neutral line, and the black test lead measures). the resistance of the other three lines. If the values are the same, the red test lead is the neutral wire and the other three are live wires.)
There are two ways to connect: one is to use a live wire and a neutral wire to connect a diode to 12 volts charging the battery; the other is to use three live wires connected to a three-phase bridge rectifier to produce 12 volts DC to charge the battery.
In addition, you can also use a live wire and a neutral wire to directly connect the car headlights for lighting purposes.
A three-phase asynchronous motor can be converted into a generator by adding an external capacitor and resistorpower ance. The external capacitor is divided into a main capacitor group and a sub-capacitor group. The main capacitor is a capacitor that allows the generator to self-excite to reach the rated no-load output voltage. The sub capacitor is used for. maintain the stability of the output voltage under load and compensate for inductive loads.
Motor wiring:
If the three-phase asynchronous motor is star connected, there is no need to change the connection method. It produces 3 phase lines and 1 neutral line for power supply. the power load and the lighting load.
If the three-phase asynchronous motor is delta connected, the coil connection method should be determined according to the shape of the load. If it is a pure lighting load, it can be changed to star connection. At this point, the output line voltage is 220V and the pha voltagese is 127 V. The lighting equipment must be connected between the two live wires and load distribution must be carried out. be as balanced as possible. For pure power loads or loads with both power and lighting, the connection must be delta. At present, there is no neutral line output and only 380V line voltage is output. If there is not much lighting, two bulbs of the same wattage can be connected in series and then connected between the two live wires. If there are multiple fixtures, three lamps of the same wattage should be connected in a group to form a Y; , and then connected to the three-phase power supply, as shown in Figure 1.
How to connect the capacitor:
The connection method of the capacitor depends on the wiring of the three-phase motor. It can be connected in a star shape or in a triangle shape. If the motor is connected in a triangle shape, the condensator can only be connected in the shape of a triangle within a triangle. In Figure 2, the motor is connected in a star configuration and the capacitor is connected in a delta configuration.
Refer to the following table for the capacity of the main capacitor bank:
All capacitors are non-polar capacitors with a withstand voltage of 450 V.
Also, for the motor to be excited and generate electricity, the rotor must have residual magnetic flux. If it cannot generate electricity normally after connecting the wires, it may be because the rotor lacks residual magnetic flux. flow. A 6V DC power supply can be used. A few seconds after randomly energizing one of the motor's phase windings, the rotor will generate residual magnetism. The problem can also be solved by connecting the motor to a three-phase power supply and idling itfor 5 to 10 minutes for magnetization.