Another name for voltage is potential difference, which is the difference between two potentials. When measuring voltage, you need to measure the potential difference between two places, so connect the two leads of the voltmeter to these two places. For example, if you want to know the voltage between the live wire and the neutral wire, connect the voltmeter to these two wires; If you want to know the voltage between the two live wires, connect the voltmeter to the two live wires.
Neither end of the two output lines of the portable generator is grounded! There is no distinction between live and neutral wires.
A single-phase motor has two windings, the starting winding and the running winding. The two windings are spaced 90 degrees apart in space. A large capacity capacitor is connected in series to the start winding When the winding in marche and the start winding transmit single-phase alternating current, the current in the start winding is 90 degrees ahead of the current in the running winding due to the single-phase alternating current. action of the capacitor, reaching the maximum value first.
Two identical pulsed magnetic fields are formed in time and space, causing the generation of a rotating magnetic field in the air gap between the stator and the rotor, under the action of the magnetic field rotating, an induced current. is generated in the motor rotor. The current interacts with the rotating magnetic field to produce an electromagnetic field torque, which turns the motor.
This type of portable generator and grid power supply are two different things! The single-phase network supply is earthed at the end of the transformer. When measuring electricity with an electric pen, the earth ist used as a source. reference point, so only the live wire will light up.
Neither end of either output line from the portable generator is grounded! There is no distinction between the live wire and the neutral wire. All windings of the portable generator are charged with electric fields! earth. It has a very high induced potential! Therefore, the electric pen will light up if it is to be connected in parallel with the circuit, so just connect one of the wires to ground (connect it to zero).
Detailed information:
The characteristics of AC motors are:
< p >1. AC motors are relatively cheap to make.2. With the development of vector frequency conversion technology, variable frequency motors can be used to simulate direct current.
3. Compared to enginesDC power supply, they have enough advantages in terms of simple structure, easy maintenance, low environmental requirements, energy saving and productivity improvement, so that AC speed regulation has been widely used in industrial and agricultural production. transport, national defense and daily life.
Baidu Encyclopedia - Single Phase AC Motor