The Arc Linear Motor Retractable Door And Control Research

The research of linear motor-driven door has a long history and mature technology, the unique advantage is playing more and more obvious, but because the electromagnetic air gap of linear motor exposed in the air, its special structure require the driver door body is generally solid door, and has a fixed platform around the door,what is more,most of the linear motor-driven doors are used in indoor places, so the application range of linear motor-driven door has been limited indeed.Based on the condition listed above, a new arc linear induction motor is proposed in the paper. It brings many new applications due to structural changes of linear induction motor, especially for driving electric retractable doors which are the most widely used in the outdoor category. The drive mechanism of rail electric retractable door with new arc linear induction motor is designed by this paper, the retractable door not only playing to the advantages of the original linear motor-driven door, but also running outdoors regardless of the weather,human and other factors, besides the secondary of motor play the function of vehicle deceleration zone, aiming at new arc linear induction motor, this paper focuses on the analytical methods, electromagnetic design and processing methods. In this paper the regional model for the motor is built by reasonable assumptions, and calculating formula of trust force and normal force is deduced with the electromagnetic theory of multi-layer traveling waves, the 3-D transient FEM model of steel secondary arc linear induction motor is established by the software of Magnet, the analytic calculating is matched to the simulation result by coincidence, by comparing with the same parameter flat steel secondary linear induction motor, with the result testifying that this steel secondary arc linear induction motor is able to reduce the normal force at the premise of not changing thrust force and increase the rate between thrust force and attractive force, lay the theoretic foundation for the calculating performance and optimizing design of this type motor.Finally, a special constant voltage variable fequeney control (CVVF) system base on DSP chip is designed , which is used in this rail electric retractable door drived by new arc linear induction motor, and the open / close operating curves are designed, the control results can be scheduled to meet the requirements of the performance index, reflecting the the outstanding advantages of this electric retractable door.