48 For noise, vibration and harshness (NVH) testing, the system supports optional, 24-bit IEPE inputs for accelerometers and microphones with bandwidth up to 200 kHz and a sample rate of 500 kS/s. It can perform Fast Fourier Transform (FFT) analysis, spectrograms and order tracking, allowing users to correlate motor-control parameters with NVH characteristics. A practical application is the evaluation of the relationship between inverter modulation methods and torque ripple. Durability testing presents the challenge of managing vast amounts of data over extended periods of time. The system can record all data continuously at full sample rates to an SSD, although this would result in terabytes of data. Instead, it offers intelligent data management. One of these is fixed-time grid sampling, which involves capturing high-resolution data at intervals; for example, one-second snapshots every hour. Another is the use of conditionbased triggers, capturing highresolution data only when predefined thresholds are met, such as torque ripple exceeding 10%. eNVH and acoustic coupling tectos provides advanced testing solutions for electric motors, powertrains, and related components, offering systems that accommodate a broad spectrum of power levels and motor types. According to managing director and CEO Dr. Dieter Höfler, tectos’ equipment can handle “the full range of potential mobility applications,” from small motors to those used in high-power applications such as EVs and even industrial machinery producing power levels of several megawatts. A standout feature of tectos’ systems is the capability to analyse electric noise, vibration, and harshness (eNVH), identifying root causes of motor noise, and helping engineers optimise their noise reduction strategies through analysis of eNVH and acoustic coupling. “Sometimes the most efficient operation point is noisy,” Höfler points out. “So using the eNVH approach helps to optimise the noise by tuning the inverter to reduce the structure borne noise of the motor itself. “We generate a 4D map where you can see the correlation between efficiency and noise over speed and load. In developing driving strategies for a car, for example, you can mask e-motor Insight | Motor testing March/April 2025 | E-Mobility Engineering Scalable eDrive solution from HBK covers the entire measurement chain including sensors, instruments and software. Key parameters such as torque, current and voltage are acquired simultaneously (Image courtesy of HBK) Using the eNVH approach helps to optimise the noise by tuning the inverter to reduce the structure borne noise of the motor itself
RkJQdWJsaXNoZXIy MjI2Mzk4