| Along with the demands of high speed and exactitude in the development of numerical control machining technique, Permanent Magnet Linear Synchronous Motor (PMLSM) as direct drive in the field of precision positioning has had widely applications. But PMLSM also exist defects, because of the flaws of iron produced end force and the cogging effect of the cogging force, both of them restricts the development of linear motor. This paper based on permanent magnet linear motor design and optimization, the mainly work as the following content:1. Make a new conclusion of main parameters of linear motor. Analysis of linear motor concentrated windings, and get concentrated and fractional-slot windings are more suited for permanent magnet linear synchronous motor winding and structure design. And then according to analysis of different fractional-slot windings structure, determine the winding structure of this motor is 11 poles 12 slots. Finally preliminarily determine the scheme of linear motor.2. Analyse the thrust fluctuations of PMLSM, understands ends force plays a main role in thrust fluctuation. And then analyses the influence of linear motor structure parameters on the end of force, summed up a certain function of the motor primary length and the polar distance can make the smallest end of the peak force; Based on selecting the linear motor wide teeth and air gap and weaken ends force. And use the divide magnetic ring theory to weaken the ends force, determine the location and size of divide magnetic ring. Also analyze the period between the two units motor phase shifting optimization.3. Completed the development of PMSLM which rated power for 106W, rated thrust for 275N,rated current for 4.4A, synchronous speed for 0.384m/s, acceleration for 8.5g.4. Build the linear motor experimental platform, complete measurement of the prototype back EMF and detent force. The experimental results show that the motor design and optimization method are accuracy.
|
PDF Full Text Request