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Noise and Vibration Analysis of Elevator Traction Machine

Elevator car noise of 1000 Hz or less radiated from elevator traction machines is a particular problem because it is not easily insulated by the elevator car’s walls. A noise evaluation method for elevator traction machines has been developed. First, an excitation test is conducted with an excitation machine to develop a numerical model. Then, the structureborne sound that radiated from the elevator traction machine excited by electromagnetic force is calculated. This force is obtained from magnetic field analysis using measured current and computed Fourier transforms of the time and space domains. The calculated results matched well with the measured results. The space orders of excitation force that had a large influence on the noise radiated from elevator traction machine are clarified.