Study on capacitive type time-grating angular position sensor with single-phase excitation
Because of these shortcomings of the existing time-grating angular position sensor with multi-phase excitation,such as the accuracy,stability and dynamic performance improved difficulty in a small volume because of the difficulty of arranging further pole pairs,an angular position measurement method for capacitive type time-grating with single-phase excitation is proposed.In this method,the single-phase excitation is used to couple into four orthogonal signals in the space field,which can be constructed travelling-wave in time and space field simultaneously by a circuit.Then,an angular position measurement can be realized.In this article,these shortcomings of time-grating with multi-phase excitation,the measurement principle of time-grating with single-phase excitation,and the sensor prototype are introduced.The effectiveness of this measurement principle is evaluated by experiments.Experimental results show that the accuracy and dynamic performance of single-phase excitation sensors are better than multiphase excitation sensors with the same size and the same number of electrodes.the prototype accuracy of±20″ and stability of 10″ were obtained.Speed fluctuation of±1.25%and the following error is±2.5″ under 400 rpm can meet the requirements of direct-drive motors.
capacitive type time-gratingsingle-phase excitationmulti-phase excitationangular position sensortraveling-wave construction
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