エレベーター用巻上機の振動騒音解析

摘要

Designing low noise elevator cars has become an important issue. Elevator car noise is caused by aerodynamics and the elevator traction machine. The noise under 1 000 Hz that radiates from a elevator traction machine is a particular problem because it is not easily insulated by the elevator car's walls, the structure of elevator traction machines differs from that of general electric motors. Hence, a noise evaluation method for the elevator traction machine has been developed. First, we conducted an excitation test with an excitation machine, the results of which showed the vibration mode. Then we designed the numerical model on the basis of the excitation test results and calculated structure-borne sound radiated from the elevator traction machine excited by electromagnetic force. This force was obtained from magnetic field analysis using measured current and computed Fourier transform of the time domain and the space domain. As a result, we show how calculated results matched the measured results well. We also show the space order of the excitation force that had a large influence on the noise radiated from the elevator traction machine.%近年，ビルの高層化に伴うエレベーター高速化の影rn響で巻上機の高速化や大型化が進んでいる．また，こrnれまではエレベーター乗りかごを駆動する巻上機を設rn置する機械室はビルの屋上に設置されていたが，エレrnベーターの機械室レス化が進み，エレベーター昇降路rn内への設置が主流となりつつある．