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              Citation: Non-Contact Electromagnetic Exciter Design with Linear Control Method. Chinese Journal of Mechanical Engineering. doi: 10.3901/CJME.2016.0129.017 shu

              Non-Contact Electromagnetic Exciter Design with Linear Control Method

              • Available Online: 2017-01-05

                Fund Project: National Natural Science Foundation of China(Grant Nos. 51505384, 51575421), Fundamental Research Funds for the Central Universities, China(Grant No. 3102015JCS05007), and Aeronautical Science Foundation of China(Grant No. 20140453008)

              • A non-contact type force actuator is necessary for studying the dynamic performance of a high-speed spindle system owing to its high-speed operating conditions. A non-contact electromagnetic exciter is designed for identifying the dynamic coefficients of journal bearings in high-speed grinding spindles. A linear force control method is developed based on PID controller. The influence of amplitude and frequency of current, misalignment and rotational speed on magnetic field and excitation force is investigated based on two-dimensional finite element analysis. The electromagnetic excitation force is measured with the auxiliary coils and calibrated by load cells. The design is validated by the experimental results. Theoretical and experimental investigations show that the proposed design can accurately generate linear excitation force with sufficiently large amplitude and higher signal to noise ratio. Moreover, the fluctuations in force amplitude are reduced to a greater extent with the designed linear control method even when the air gap changes due to the rotor vibration at high-speed conditions. Besides, it is possible to apply various types of excitations: constant, synchronous, and non-synchronous excitation forces based on the proposed linear control method. This exciter can be used as linear-force exciting and controlling system for dynamic performance study of different high-speed rotor-bearing systems.
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                沈阳化工大学材料科学与工程学院 沈阳 110142

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