Development Of Measuring Equipment For Clearance Of Pneumatic Rotor Gyro Motor

The dynamic pressure motor is the core element of gyro instrument and is one of the main determinants of gyroscope precision.In order to ensure the stability of the motor,the clearance should be maintained within a certain range.At present,the measurement of static clearance of dynamic pressure motor adopts manual measurement method,and the accuracy and repeatability of measurement results are easily influenced by human factors,and cannot meet the demand of mass measurement.Therefore,it is urgent to have a measuring equipment with high degree of automation and high precision for the clearance of air float rotor gyroscope dynamic pressure motor.In order to solve the above problems,an automatic measurement device for the clearance of a gas floating rotor gyroscope dynamic pressure motor is developed.In the process of development,the following work is accomplished.According to the measurement task,the modular design concept is adopted to design the overall scheme of the device.Its main structure consists of clamping module,automatic applying force module and measuring module.The clamping module is mainly used to fix the extension axis at both ends of the motor and the clamping of the intermediate rotor.The automatic application module is composed of a tri-axial force sensor and a tri-axial precision displacement platform to realize the continuous and rapid application of force.The measurement module completes the accurate measurement of axial and radial clearance of the dynamic pressure motor and adopting the relative measurement method to avoid the adverse effect of the drift of the inductance micrometer.According to the function and action of the main module of the equipment to select the matching hardware.Special control circuit and air circuit are designed and constructed to ensure the stability of corresponding hardware operation and improve anti-interference ability.The force sensor protection circuit is designed to protect the tri-axial force sensor.According to the measurement task to make the appropriate measurement strategy,and use the standard state machine design mode to write the control program to realize the clearance automatic measurement.The friendly program operation interface is designed based on the pop-up dialog box,which has fewer buttons,simple operation and low requirements on the skill level of operators.Debugging equipment and according to the problem to improve the structure and adjust the hardware.Designing the special damping device to adjust the consistency of the two fixed devices.Analyzing the factors that may affect the measurement accuracy and improving the related structure and hardware according to the above analysis.Testing the accuracy of tri-axial force sensor by placing weights.Testing the performance of the measuring system by measuring the clearance of whole model.The measurement results show that the clearance measuring system is simple in operation and high in efficiency,and can meet the requirements of measuring precision.Finally,testing the clamping capacity of the measuring auxiliary module by measuring a certain model of the motor.The measurement results show that the measuring module can’t hold the measured parts well,resulting in a large measurement result.The next step is to improve the structure of the measurement auxiliary module.