Design And Performance Analysis Of Linear Motor For Applications Of Electric Sliding Door

With the constant improvement of the level of building automation, electric sliding doors are widely used. Traditional drive of sliding door has disadvantages such as large volume, big noise and high mechanical loss due to the use of mechanism. In this thesis, the permanent magnet linear motor is used to drive sliding door, which can convert electrical energy into linear motion directly, so those disadvantages can be avoided. Through simulation and optimization analysis, the motor is designed. A prototype is manufactured, and an experiment is carried on to verify simulation results.The structure and components of the sliding door are introduced. The requirements of the linear motor are put forward according to the dynamic model of driving device and opening speed curve. The motor is designed with the traditional method. In order to analyze main characteristics of the motor, the finite element model of the motor is established according to the initial size of the motor.Optimization of the size of permanent magnets is conducted. An appropriate size is selected after calculating the amplitude and harmonic percentages of no-load back electromotive force and detent force at different sizes. Cogging force is calculated with single slot infinite model. The influence of pole-slot coordination and the size of slot on the cogging force is studied. It proves that the cogging force makes up a tiny percentage of detent force. Detent force is reduced by changing the size of end tooth. The effects of changing end tooth width and decreasing end tooth height for reducing detent force are compared.A prototype is manufactured and tested. The test results show that the performance of the prototype is good.