NV Dynamics was retained by a very popular automotive behemoth to conduct frequency response testing on several electric drive motor’s ‘stator’, to determine natural frequencies in the installed condition and check the consistency between identical stators.
About 25+ individual stators, one after the other, were mounted onto a pre-cast drivetrain casing with the help of bolts and the entire setup was placed on damper material to ensure that it is isolated from other external vibration that is not a part of the testing.
In the mounted condition, 6 units of triaxial accelerometers were mounted onto the teeth present along the inner surface of each individual motor-stator; the accelerometers were connected to two synchronized 12-channel data acquisition systems. A force hammer was used to impact the stator at an identified point in order to excite the setup across the desired frequencies. Vibration testing/mounting of vibration transducers were mounted at three levels within each stator, namely at lower, middle, and upper levels.
At each level, multiple hammer impacts were made at the identified location, to obtain the ratio of output to input, generating Frequency Response Functions (FRFs) which were later analyzed to obtain the natural frequency of the individual stators and compare for consistency.
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