The supplier of linear induction motors motors is a mechanical device that converts electrical energy directly into linear motion. Since 1917 appeared the first cylindrical linear motor, has been nearly 100 years of development. According to the different structure type, linear motor can be divided into flat type linear motor and cylindrical linear motor.
Linear induction motors and rotary induction motors in the principle of work is no essential difference. Just get the mechanical movement in a different way. But both in the electromagnetic performance there is a big difference drama, mainly in the following three aspects:
(1) Rotary induction motors stator three-phase winding is symmetrical. Thus if the applied three-phase voltage is symmetrical. The three-phase current is symmetrical. But the linear three-phase winding of the linear induction motors is asymmetrical in the space position. The coil at the edge is compared to the coil located in the middle. The inductance value is very different. In other words: phase reactance is not equal. Thus, even if the three-phase voltage is symmetrical. The three-phase winding current is also asymmetrical. The following are the same as the "
(2) Rotary induction motors set, the rotor asked the air gap is round, no head no tail, continuous. There is no beginning and end. But the linear induction motors between the primary and secondary air gap exists between the beginning and end. When the secondary end enters or exits the air gap. Will be in the secondary conductor to induce additional current. This is the so-called "marginal effect". Due to the influence of the edge effect, the linear induction motors and the rotary induction motors are quite different in operating characteristics. The following are the same as the "
(3) As the linear induction motors early, secondary in the direction of the straight line to continue a certain length, and the normal electromagnetic force is often uneven, so the mechanical structure of the general between the primary and secondary air gap done Longer. such. Its power factor is lower than the rotary induction motors.