Air gap magnetic field of linear asynchronous motor11111

As a result of the discontinuity of the core of the linear motor and the discontinuity of the winding, the impedance of each phase winding of the linear motor is asymmetrical, so even if the three phase is added.

In a symmetrical power supply, the three-phase current is not symmetrical in a three-phase winding, so the positive magnetic field is not only produced in the air gap, but also in the air gap.

And there is a reverse moving magnetic field, and at the same time, the two side ends will also form a pulse magnetic field. The reverse magnetic field and the pulse magnetic field will cause additional loss.

The thrust and efficiency of the linear motor are reduced, and this effect exists at the time of secondary stillness, so it is called the static longitudinal edge effect of the linear motor.

In the secondary movement, there is also a transient edge effect, called dynamic longitudinal edge effect, caused by secondary anti sudden entry and departure.Should.