Why measure magnetic fields?
Magnetic fields are at the heart of every electric motor. Their precise characteristics determine efficiency, torque, noise behavior, and much more. That’s why accurate magnetic field measurement is a key component of modern test systems—especially in series testing and the development of electric machines.
Our test systems enable high-resolution analysis of magnetic fields in the rotor and stator — non-contact, automated, and in real time. This offers several advantages:
Functional testing of electric motors
Electric motors operate through the interaction of electric currents and magnetic fields. The quality and alignment of these magnetic fields influence:
- torque
- efficiency
- and the smooth running of the motor
Measuring the magnetic fields helps ensure that the motor is functioning correctly.
Error detection & quality assurance
Deviations in the magnetic field often indicate:
- Production defects (e.g., incorrectly installed permanent magnets)
- Material faults (e.g., demagnetized components)
- Assembly errors (e.g., misaligned rotors)
A precise magnetic field measurement system can detect these issues early and non-destructively—ideal for end-of-line test benches like those developed by Koob Testsystems.
Safety Aspects & EMC (Electromagnetic Compatibility)
Strong or unexpected magnetic fields can:
- interfere with other components (e.g., sensors, control units)
- pose safety risks (e.g., in medical technology or the automotive sector)
Magnetic field measurement helps to verify and improve electromagnetic compatibility (EMC).
Validation of Simulation and Development Data
In the development of new drive systems, magnetic fields are often simulated. Real-world measurement is used to validate these simulations—essential for OEMs and Tier 1 suppliers aiming to build reliable and efficient drives.
Optimization of Motor Performance & Matching in Series Production
The magnetic flux density in the stator and rotor has a significant impact on the efficiency and performance of an electric motor. Precise magnetic field measurement makes it possible to:
- specifically improve the motor design
- use materials more efficiently
- optimize weight and size (e.g., in e-mobility applications)
In series production, magnetic field measurement can also be used for targeted component matching:
→ Rotors with particularly strong magnetic properties can be deliberately paired with slightly weaker stators – and vice versa.
This ensures consistent performance across the entire production batch, despite natural tolerances in individual parts.
The result:
- consistent quality for the customer
- higher yield in production
- reduced performance variation
What is meant by NVH irregularities?
NVH stands for Noise, Vibration, and Harshness. It is a technical field that deals with the perception and measurement of noise and vibrations in vehicles or machines.
Relevance to Electric Motors:
NVH is particularly important in electric motors because, unlike combustion engines, they operate very quietly. As a result, other sources of noise become more noticeable. One key factor is magnetic imbalance caused by the electromagnetic forces within the motor. These can lead to vibrations and oscillations that negatively affect driving comfort and the durability of the powertrain.
In addition to these magnetically induced effects, bearing noise, transmission components, and shifting operations also play a role. Identifying and minimizing these NVH influences requires specialized test systems and precise analysis methods.
How can Koob Testsystems help?
Koob Testsystems offers tailor-made test systems for electric machines. The integration of magnetic field measurements into test benches makes it possible to:
- ensure the product quality of customers
- validate development data
- detect faults automatically
- meet regulatory requirements (e.g., in the automotive sector)
This positions Koob as a partner delivering real added value for the production and development of modern electric motors.
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