In the above picture, red and black power supplies power to the receiver, and white signal lines. The following explains the single-phase motor and three-phase motor in detail:
1, three-phase AC motor. Brushless, three-phase coil stator outside, three-phase electricity, squirrel-cage rotor inside.
Three-phase motors are allowed to start directly at full voltage. If the load torque is not large, the step-down starting mode can also be adopted. When step-down starting occurs, the starting torque of the motor decreases roughly in direct proportion to the square of the voltage. If the moment of inertia (J) of the load machine is within a certain range, the motor is allowed to start continuously twice in cold state and once in hot state.
2. Single-phase motor: There are brushes, such as DC motors in small toys. There is a brush, the external permanent magnet stator does not rotate, and the built-in coil rotor rotates.
The rated voltage of common single-phase motors is 220V, which is not commonly used in industrial production and is mainly used for civil use. Because the efficiency of single-phase motor is not as high as that of three-phase motor, once the power requirement is higher than kilowatts, or several kilowatts, three-phase motor will be selected. The motors at home are generally single-phase motors, because the load is small, like some motors in industrial production, as large as 5000KW. If a single-phase motor is used, among other things, how thick the wire is! !
In fact, a single-phase motor has two sets of windings, one is the working winding, that is, the main winding, and the other is the starting winding, that is, the secondary winding. Because the single-phase motor adopts single-phase power supply, it will not produce rotating magnetic field on the winding, but pulsating magnetic field, which will not produce torque, so the motor will not rotate, so it is necessary to add a starting winding to him, and the power supply of the starting winding is also derived from the power supply of the main winding. But a phase-shifting device (such as a capacitor) is added in the middle, so that after the current passes through the phase-shifting device, the current will be out of phase and become the so-called two phases, so that a rotating magnetic field is generated inside the winding, and the motor will rotate. Another example is a DC brushless motor, such as a computer fan. The middle coil does not move, and the outer rotor rotates. The rotation is detected and controlled by the Hall element.
Extended data:
The most important application of electric tuning is in toy models such as airplane models, car models, ship models, flying saucers and frisbees. These models use electric modulation to drive the motor to complete various instructions and imitate its real working function, so as to achieve similar effects to the real situation. Therefore, there are specially designed aircraft model electric tuning, car model electric tuning and so on.
The function of electric regulation is to control the motor and complete the specified speed and action. Therefore, electric modulation is also widely used in production and life, such as electric modulation on power tools, electric modulation on medical equipment, electric modulation on automobile turbines, special electric modulation of special fans and so on. Some manufacturers of electric tuning will tailor the electric tuning for you according to your different needs and motor parameters.
References:
Baidu encyclopedia-diandiao