| Acoustic noise and vibration of permanent magnet servo motor (PMSM) are both hotand difficult issue in recent years. With the extension of applications in high precisionprocessing, low noise, direct drive, the requirement to performances of PMSM becomesincreasingly high, especially for its noise and vibration which directly affected theperformance of work systems. Study on the electromagnetic vibration is of greatsignificance. In addition, as traction servo motor promoted the application of permanentmagnet motor which has series of advantages such as high efficiency and large powerdensity, anti-shock characteristic became another performance index of PMSM.Firstly, this paper analyzed the order, frequency and amplitude of electromagneticforce wave in detail, summarized the correlation between the orders of electromagneticforce wave and the corresponding vibration frequencies, and found out the major order ofmagnetic field harmonics that caused electromagnetic vibration, which has significance formethods to weaken the vibration and noise, such as increasing the order of electromagneticforce wave, making the force frequency far from the natural frequency.Secondly, this paper studied the modal of interior permanent magnet (IPM) servomotor and analyzed the impacts of structural parameters and inverter on electromagneticvibrations. Taking the IPMSM of20kW as an example, the effects caused by structurecomponents on natural frequency are analyzed based on the calculations of differentmodels. Variation rules between electromagnetic vibration characteristic of IPM PMSM ondifferent conditions and structure parameters, pole arc factor, non-uniform air gap andinverter switching frequency are calculated and analyzed. Inverter switching frequency thatcan reasonably avoid resonance is provided.Finally, the anti-shock property of PMSM is analyzed. Take the traction motor of190kW for example, this paper provides a method to estimate the anti-shock property byComputer Simulation and analyzed forces of motor’s structural components vary withanti-shock loads. |
