Koje su karakteristike i karakteristike jednofaznog univerzalnog motora na izmjeničnu struju?
1. Karakteristike jednofaznih AC univerzalnih motora
Prednosti:
1) može se koristiti i za AC i DC;
2) Velika brzina, općenito 400035000 RPM/min;
3) Pogodna regulacija brzine (regulacija napona i brzine), a brzina nema nikakve veze sa frekvencijom snage;
4) Početni moment je velik, 47 puta veći od nominalnog momenta;
5) Mehaničke karakteristike su meke, a kapacitet preopterećenja je jak;
6) Efikasnost je općenito 30 posto 70 posto;
7) Mala veličina i mala težina;
Nedostaci:
habanje ugljenih četkica i komutatora, varnice unatrag, elektromagnetne smetnje itd.
2. Za 1 fazni AC motor serije, ima 4 karakteristike pod stabilnim naponom i frekvencijom
1)The relationship between current and torque: I=f(T), which is similar to a parabolic characteristic. If don't consider the influence of magnetic circuit saturation, T∝I2;
2)The relationship between current and speed: I=f(n), which is similar to a hyperbolic characteristic. When the power supply voltage is constant and the effect of magnetic circuit saturation is not considered, n∝(1/I);
3) Odnos između brzine i momenta: n=f(T). Ova karakteristična kriva je meka karakteristika;
4)The relationship between power factor and torque: COS(ф)=f(T), it is a straight line close to the level. The power factor of this type of motor is high, above 0.9, and the high-speed motor can be above 0.95;
In addition, the no-load speed of a single-phase series motor is theoretically infinite, so the no-load speed is very high. Therefore, the mechanical strength of the motor is usually taken into consideration, and no-load operation is not allowed for fear of "speeding." But in fact, due to the friction of the bearing, the pressure and friction of the brush, the wind friction of the armature and the demand for ventilation and heat dissipation, the armature is equipped with fan blades, which is equivalent to adding a small load to the motor, so the actual no-load speed is not It may be infinite. But the no-load speed is still relatively high, generally 1.5 to 3 times the rated speed, or even higher.
