Validation of a Window Regulator - From Prototype to Product
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Validation of a Window Regulator – From Prototype to Product Power windows, automatic tailgates or electric drives for seat adjustment are installed in almost all vehicle classes. Even though they are components of the standard equipment, an enormous amount of time and money is required to test these electric drives. Göpel electronic demonstrates how safety and convenience aspects are implemented in quality checks throughout the entire cycle from the development phase to final testing.
ALMOST 100 ELECTRIC MOTORS IN ONE CAR
More and more electric drives are used in modern passenger cars to make dif ferent functions possible, in particular assistance and convenience functions. These include window regulators, tail gates and seat adjusters. Up to hundred
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electric motors are installed in a vehicle today. Adjusting the main headlights or positioning the exterior mirrors are other classic examples of electromotive operation. Depending on the application area, these drives must meet completely differ ent requirements. For example, a win dow regulator is operated comparatively
infrequently, yet it still must provide a high force to move the window in winter despite freezing conditions. Similarly, it must resist high external force to prevent the window from being pushed down by intruders. In contrast, a cooling fan mo tor must be active inside a seat for an extended period of time while running efficiently and quietly at low power.
AUT H O R S
Dipl.-Ing. (FH) Andreas Neubert is System Developer for Motor Testing at Göpel electronic GmbH in Jena (Germany).
Matthias Müller, M. A. is Manager for Public Relations at Göpel electronic GmbH in Jena (Germany).
Just as the requirements for the motors themselves are varied, the requirements are also different for the systems that help product developers improve effi ciency, test long-term use during endur ance testing or check the quality param eters in the main operating points in the End-of-Line (EoL) test. At the beginning of every product development is the pro totype, on which extensive tests are car ried out. On the one hand, developers want to gain insights into the quality of the design, and on the other hand, they want to derive initial specifications for the later production process.
includes resistance of the window regu lator to force from the outside or very fast access to the operating point speed to close the window quickly – or, in the event of a jam, to quickly change direc tion and reopen the window. In terms of convenience, electric cars in particu lar place enormous demands on low noise generation of the e-drives. Regular true running, low coefficients of friction and avoidance of vibrations play a major role here. If speed fluctuations need to be partially rapidly adjusted, the clamp ing force can increase at this position. Here, incorrect reversals can result if no adjustments can be made. It depends on the correct evaluation of the irregular motion measurements within the analy sis software of the Carmen develo
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