scholarly journals Acoustic Noise and Vibration Reduction of Coreless Brushless DC Motors with an Air Dynamic Bearing

2009 ◽  
Vol 4 (2) ◽  
pp. 255-265 ◽  
Author(s):  
lee-Woo Yang ◽  
Young-Seok Kim ◽  
Sang-Uk Kim
Keyword(s):  
Acoustic Noise ◽  
Vibration Reduction ◽  
Noise And Vibration ◽  
Brushless Dc Motors ◽  
Brushless Dc ◽  
Dc Motors ◽  
Noise And Vibration Reduction

scholarly journals Effectiveness of Power Electronic Controllers in Mitigating Acoustic Noise and Vibration in High-Rotor Pole SRMs

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 702
Author(s):  
Ziyan Zhang ◽  
Selin Yaman ◽  
Mohamad Salameh ◽  
Suryadev Singh ◽  
Chengxiu Chen ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Acoustic Noise ◽  
Vibration Reduction ◽  
Theoretical Background ◽  
Power Electronic ◽  
Noise And Vibration ◽  
Switched Reluctance ◽  
Switched Reluctance Machines ◽  
Rotor Pole ◽  
Noise And Vibration Reduction

This paper presents a comparative evaluation of power electronic control approaches for vibro-acoustic noise reduction in High Rotor-Pole Switched Reluctance Machines (HR-SRM). It carries out a fundamental analysis of approaches that can be used to target acoustic noise and vibration reduction. Based on the comprehensive study, four candidates for control have been identified and applied to the HR-SRM drive to evaluate their effectiveness and identify challenges. These four methods include phase advancing, current shaping based on field reconstruction, and random hysteresis band with and without spectrum shaping. The theoretical background, implementation, and vibro-acoustic noise reduction performance of each method are presented in detail. Comparative studies from simulation and experimental measurements have been used to identify the most effective solution to acoustic noise and vibration reduction in HR-SRM configuration.

scholarly journals Review of Switched Reluctance Motor Control for Acoustic Noise and Vibration Reduction

2018 ◽  
Vol 1 (2) ◽  
pp. 59-62
Author(s):  
Jihad Furqani ◽  
Agus Purwadi ◽  
◽  
Keyword(s):  
Permanent Magnet ◽  
Hybrid Electric Vehicle ◽  
Acoustic Noise ◽  
Vibration Reduction ◽  
Switched Reluctance Motor ◽  
Permanent Magnet Motor ◽  
Noise And Vibration ◽  
Switched Reluctance ◽  
Reluctance Motor ◽  
Noise And Vibration Reduction

Switched Reluctance Motor (SRM) is one of the candidates for substituting permanent magnet motor in Hybrid Electric Vehicle (HEV) application. Compared to permanent magnet motor, SRM is relatively low cost, robust, high reliability, and possible for high-temperature operation because of the absence of permanent magnet. One significant problem in SRM is the high acoustic noise and vibration. The vibration in SRM is caused by the radial forces acting at the stator teeth. Because of the saliency pole configuration in SRM, vibration is prominent. Many studies tried to reduce acoustic noise and vibration in SRM. In this paper, several controls for acoustic noise and vibration reduction are shown. The acoustic noise and vibration reduction from the experiment are also compared in each method.

Electromagnetically Generated Acoustic Noise in DC Machines

1995 ◽  
Author(s):  
Sangmoon Hwang ◽  
Dennis K. Lieu
Keyword(s):  
Acoustic Noise ◽  
Noise Generation ◽  
Element Analysis ◽  
Brushless Dc Motors ◽  
Brushless Dc ◽  
Dc Motors ◽  
Brushless Motor ◽  
Dc Excitation ◽  
Common Observation ◽  
Secondary Winding

Abstract Acoustic noise of generated in DC motors is difficult to predict, and its exact mechanism is unclear. It is a common observation that brushless DC motors with rare earth magnets are often acoustically inferior to motors of equivalent output built with conventional magnets. In this paper, the acoustic noise of electromagnetic origin is investigated using a magnetic frame which emulates a DC motor. The driving electromagnetic force is calculated using finite element analysis and the resulting vibration and acoustic noise is measured. Acoustic noise of purely electromagnetic origin was also measured from a DC brushless motor to confirm the results of the magnetic frame. The results of the study show that the mechanism of noise generation can be a quasi-static response of a stator not only at the fundamental frequency but also at higher harmonic frequencies of alternating switched DC excitation of motor phases. Noise generation is significantly aggravated when some of those harmonics match the resonant frequencies of the stator. Eddy current flow within the magnets due to the time varying electromagnetic field act as a shorted transformer secondary winding, and results in a reduction of the electrical phase impedance. This reduced impedance results in a faster rise time with a sharper current shape during transients, and increased current magnitude during steady state, thus making the motor noisier.

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