{"id":3764,"date":"2026-07-08T07:10:06","date_gmt":"2026-07-08T07:10:06","guid":{"rendered":"https:\/\/theemcnews.co.uk\/?page_id=3764"},"modified":"2026-07-08T07:11:40","modified_gmt":"2026-07-08T07:11:40","slug":"emc-testing-of-e-motor-systems","status":"publish","type":"page","link":"https:\/\/theemcnews.co.uk\/index.php\/emc-testing-of-e-motor-systems\/","title":{"rendered":"EMC Testing of E-Motor Systems"},"content":{"rendered":"\t\t
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Technical Measures to Fulfill Practical and\u00a0CISPR<\/a>\u00a025-Compliant\u00a0EMC<\/a>\u00a0Tests on E-Axles<\/em><\/h1>

E<\/span>lectromagnetic compatibility (EMC<\/a>) testing of e-drives and e-axles at the component level per\u00a0CISPR<\/a>\u00a025 requires both technical measures and carefully developed implementation strategies to ensure that measurements accurately reflect real-world performance. Given the rising demands on performance classes, particularly for high-power electric axles, these tests require a setup that closely resembles the e-axle\u2019s actual in-vehicle installation conditions. Achieving this realistic test setup presents unique challenges, as the scale and complexity of the test object directly impact the design and setup of the test bench.<\/span><\/p>

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Figure 1: Rendering of EDTC-AX, with two outside load machines<\/figcaption><\/figure>

For realistic testing, it is essential to account for the mechanical and spatial demands of larger e-axle systems. This often necessitates a significantly larger test bench than those typically used for conventional automotive components. Such an expanded setup results in increased metal structures within the test environment, specifically in the\u00a0anechoic chamber<\/a>. This added metal can influence the\u00a0electromagnetic field<\/a>\u00a0distribution, potentially introducing reflections and resonances that affect measurement accuracy. Thus, ensuring that metallic elements do not interfere with the\u00a0EMC<\/a>\u00a0results is a primary concern in the test bench design.<\/p>

Another critical factor is the routing of cable harnesses. In many test benches, these cables must be routed near the metallic structures of the test setup. Ideally, they should be placed at the standardized length specified by\u00a0CISPR<\/a>\u00a025 on the table\u2019s\u00a0ground<\/a>\u00a0plane. However, this proximity to metal surfaces can lead to unintended electromagnetic coupling and alter the\u00a0interference<\/a>\u00a0profile, creating additional challenges for measurement precision.<\/span><\/p>

The long wire method has typically been used to assess the impact of these factors on the\u00a0interference<\/a>\u00a0emission range of 150\u00a0kHz<\/a>\u00a0to 1 GHz. This method allows for testing multiple test setup variations, providing insights into how different configurations influence emissions. While the long wire approach can identify general trends, it may not fully replicate the actual setup of a complex e-axle system. Nevertheless, it serves as a useful basis for studying how elements such as metallic proximity, cable routing, and structure size impact emissions across various test\u00a0configurations.<\/span><\/p>

The findings from our investigation highlight the complexities and potential variabilities involved in\u00a0EMC<\/a>\u00a0testing for electric drives and axles, particularly when different test benches yield slightly different results. Consequently, this study aims to initiate a broader discussion on the standardization and reproducibility of measurement results for electric drives and axles across diverse test environments. By sharing these findings, we hope to encourage further research into optimizing\u00a0EMC<\/a>\u00a0test setups and, ultimately, to foster more standardized and comparable testing practices for e-drive systems.<\/span><\/p>

Normative Basics and Crucial Aspects for\u00a0EMC<\/a>\u00a0Testing<\/b><\/h2>

When performing\u00a0EMC<\/a>\u00a0testing on automotive components according to\u00a0CISPR<\/a>\u00a025, there are several crucial aspects to consider:<\/span><\/p>