Research Papers

Experimental Analysis of the Vibroacoustic Response of an Electric Window-Lift Gear Motor Generated by the Contact Between Carbon Brushes and Commutator

[+] Author and Article Information
S. Diop

Inteva Products,
Esson 14220, France;
Laboratoire de Tribologie et
Dynamique des Systèmes,
UMR CNRS 5513,
Ecole Centrale de Lyon,
Université de Lyon,
36 Avenue Guy de Collongue,
Ecully Cedex 69134, France
e-mail: sarah.diop@doctorant.ec-lyon.fr

E. Rigaud

Laboratoire de Tribologie et
Dynamique des Systèmes,
UMR CNRS 5513,
Ecole Centrale de Lyon,
Université de Lyon,
36 Avenue Guy de Collongue,
Ecully Cedex 69134, France
e-mail: emmanuel.rigaud@ec-lyon.fr

P.-H. Cornuault

Department of Applied Mechanics,
FEMTO-ST Institute,
Université Bourgogne Franche-Comté,
Besançon 25000, France
e-mail: pierre-henri.cornuault@ens2m.fr

E. Grandais-Menant

Inteva Products,
Esson 14220, France
e-mail: EGrandaisMenant@intevaproducts.com

B. Bazin

Inteva Products,
Esson 14220, France
e-mail: BBazin@intevaproducts.com

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received October 31, 2016; final manuscript received May 2, 2017; published online July 26, 2017. Editor: I. Y. (Steve) Shen.

J. Vib. Acoust 139(6), 061002 (Jul 26, 2017) (6 pages) Paper No: VIB-16-1524; doi: 10.1115/1.4036869 History: Received October 31, 2016; Revised May 02, 2017

This paper deals with the vibroacoustic behavior of an electric window-lift gear motor for automotive vehicle which consists of a direct current (DC) motor and a worm gear. After describing the overall vibroacoustic behavior of this system and identifying the various excitation sources involved, this study focuses on the excitation sources associated to the contacts between brushes and commutator. To that end, a specific test bench is designed. It makes use of a modified gear motor for which various specific rotors are driven with an external brushless motor. It allows the discrimination of some excitation sources associated to the contact between brushes and commutator by removing them one after the other. The respective weight of friction, mechanical shocks, electrical current flow, and commutation arcs occurring jointly at the brush/commutator interface are dissociated and evaluated. The friction and the mechanical shocks between brushes and commutator blades increase the vibroacoustic response of the window-lift gear motor. The flowing of electrical current in brushes/commutator contacts tends to moderate the frictional component of excitation sources, while commutation arcs induce their rising, leading to a global additive contribution to the dynamic response.

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Fig. 1

Window-lift gear motor: steel (1), permanent magnet (2), coils (3), rear (4), commutator (5), carbon brushes (6), center (7), worm (8), front bearings (9), gear wheel (10), plastic housings (11), and fixation points (12)

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Fig. 2

Time evolution of the rotor velocity: standard operating conditions of the window-lift gear motor (a) and qualification test with Vt = 7000 rpm or trials with Vt = 4500 rpm (b)

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Fig. 3

PSD at 7000 rpm (a) and spectrogram (b) of the vibroacoustic response

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Fig. 4

Experimental test bench: speed meter (1), torque meter (2), powder brake (3), flexible mechanical couplings (4), and external brushless motor (5)

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Fig. 5

Evolution of the acceleration RMS value versus rotor velocity for trial C. Red crosses are mean values. Vertical red bars are standard deviation. Blue-dotted line is a linear approximation of RMS values versus rotor velocity.



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