The principle of trackless electric retractable door
无轨电动伸缩门的原理
The working principle of the trackless electric retractable door is based on the law of electromagnetic induction, the full circuit Ohm's law, and the law of electromagnetic force.
无轨电动伸缩门工作原理是建立在电磁感应定律、全电路欧姆定律、和电磁力定律等基础上的。
When the magnetic pole rotates in the clockwise direction, the magnetic line of the magnetic pole cuts the rotor guide bar, and the electromotive force is induced in the guide bar.
当磁极沿顺时针方向旋转，磁极的磁力线切割转子导条，导条中就感应出电动势。
The direction of the electromotive force is determined by the right-hand rule.
电动势的方向由右手定则来确定。
Because the movement is relative, if the magnetic pole does not move, the rotor guide bar rotates in the counterclockwise direction, the guide bar can also induce the electromotive force.
因为运动是相对的，假如磁极不动，转子导条沿逆时针方向旋转，则导条中同样也能感应出电动势来。
Under the action of electromotive force, an electric current is generated in the closed guide bar.
在电动势的作用下，闭合的导条中就产生电流。
This current interacts with the magnetic field of the rotating magnetic pole, and the rotor guide bar is subjected to an electromagnetic force (amperage force), the direction of which can be determined by the left-handed rule.
该电流与旋转磁极的磁场相互作用，而使转子导条受到电磁力(安培力)，电磁力的方向可用左手定则确定。
The electromagnetic force then generates electromagnetic torque, and the rotor turns.
由电磁力进而产生电磁转矩，转子就转动起来。
In this design, the motor is used to drive the opening and closing of the electric retractable door to complete the control of the electric retractable door.
在该设计中电动机是用来带动电动伸缩门的开与关，完成对电动伸缩门的控制。
