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Over the last few years, machine tools are ones of the most hottest-selling goods in mechanical industry of Taiwan’s exports, furthermore, in precise machine industry, mechanical facilities move to the correct spot having a lot to do with products’ quality, this thesis uses ARM as a control chip, and apply to air motor to control the displacement platform’s fixed position, During the movement, air motor’s rotational speed is related to air inflow and air pressure, therefore, the friction in the system and the compressible air make the control more difficult, So this thesis uses controlling rules like P-control and Internal Model. P-control is a traditional PID control only using the P part, it’s most overshoot maybe is too big or the steady state error is not good, so this thesis uses the valve opening to make the response not so fast, and Internal Model can filter the external disturbance to make the control effect more precise.
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