{"id":3023,"date":"2026-07-24T09:09:21","date_gmt":"2026-07-24T01:09:21","guid":{"rendered":"http:\/\/www.innvant.com\/blog\/?p=3023"},"modified":"2026-07-24T09:09:21","modified_gmt":"2026-07-24T01:09:21","slug":"how-to-reduce-the-electromagnetic-interference-of-an-ac-servo-motor-4f60-1e9fe3","status":"publish","type":"post","link":"http:\/\/www.innvant.com\/blog\/2026\/07\/24\/how-to-reduce-the-electromagnetic-interference-of-an-ac-servo-motor-4f60-1e9fe3\/","title":{"rendered":"How to reduce the electromagnetic interference of an AC servo motor?"},"content":{"rendered":"

Hey there! I’m a supplier of AC servo motors. Over the years, I’ve gotten tons of questions from customers about reducing electromagnetic interference (EMI) in these motors. EMI can be a real pain in the butt as it can mess up the motor’s performance and even cause problems for other nearby electronic devices. So, I thought I’d put together this blog to share some tips on how to reduce EMI in an AC servo motor. AC Servo Motor<\/a><\/p>\n

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First off, let’s understand what EMI is all about. Electromagnetic interference is basically the disturbance that affects an electrical circuit due to either electromagnetic induction or electromagnetic radiation emitted from an external source. In the case of AC servo motors, the high – frequency switching of power transistors in the drive can generate strong electromagnetic fields, which can lead to EMI.<\/p>\n

One of the easiest ways to start reducing EMI is through proper grounding. A good ground connection is like a safety net for your motor. It provides a low – resistance path for the electrical current, which helps to direct the interference safely to the ground. When grounding your AC servo motor, make sure to use a wide and short grounding wire. Why? Well, a short wire has less resistance, and a wide wire can handle more current. Also, connect the motor frame, the drive enclosure, and the control cabinet to the same ground point. This helps to create a unified ground reference and reduces the chances of ground loops, which can be a major source of EMI.<\/p>\n

Another important aspect is shielding. Shielding is like putting a protective cloak around your motor and its associated cables. You can use metal enclosures for the servo drive and the motor. These metal enclosures act as a Faraday cage, which blocks the electromagnetic fields from escaping. When it comes to cables, use shielded cables. The shield around the cable conductors helps to contain the electromagnetic fields generated inside the cable and also prevents external fields from interfering with the signals in the cable. Make sure to properly ground the shield at both ends of the cable. This ensures that any induced currents in the shield are safely redirected to the ground.<\/p>\n

Filtering is also a key strategy. You can use input and output filters on the servo drive. Input filters are installed between the power supply and the drive. They help to reduce the high – frequency noise that can come from the power grid and also prevent the noise generated by the drive from going back into the power grid. Output filters, on the other hand, are placed between the drive and the motor. They smooth out the voltage and current waveforms supplied to the motor, reducing the high – frequency components that can cause EMI. There are different types of filters available, such as LC filters (inductor – capacitor filters) and RC filters (resistor – capacitor filters). The choice of filter depends on the specific requirements of your application, like the frequency range of the interference and the power rating of the motor.<\/p>\n

Now, let’s talk about the layout of the components. The way you arrange the motor, the drive, and other associated equipment can have a big impact on EMI. Keep the power cables and signal cables separate. Power cables carry high – power currents, which can generate strong electromagnetic fields. Signal cables, on the other hand, carry low – level signals that are very sensitive to interference. By keeping them apart, you reduce the chances of the power cable’s electromagnetic fields interfering with the signal cable’s signals. Also, try to minimize the length of the cables. Shorter cables have less opportunity to pick up or radiate electromagnetic interference.<\/p>\n

Pulse width modulation (PWM) settings can also play a role in reducing EMI. The PWM is used to control the speed and torque of the AC servo motor. By adjusting the PWM frequency and other parameters, you can change the spectral characteristics of the motor’s electrical signals. For example, increasing the PWM frequency can spread the energy of the generated electromagnetic fields over a wider frequency range, which can reduce the peak interference at specific frequencies. However, increasing the frequency too much can also increase the power losses in the drive, so it’s a bit of a balancing act.<\/p>\n

Software control can be an effective way to deal with EMI as well. Advanced control algorithms can be used to optimize the motor’s operation and reduce the generation of high – frequency harmonics. For example, some algorithms can adjust the motor’s current and voltage waveforms in real – time to minimize the electromagnetic emissions. These algorithms can also compensate for any variations in the load or the power supply, which can help to maintain a stable and low – interference operation.<\/p>\n

In addition to these technical measures, regular maintenance is also crucial. Check for loose connections in the motor, the drive, and the cables. A loose connection can cause arcing, which is a significant source of EMI. Also, keep the motor and the drive clean. Dust and dirt can accumulate on the components and cause insulation problems, which can lead to increased EMI.<\/p>\n

Now, I know that implementing these measures might seem a bit overwhelming, but don’t worry. As an AC servo motor supplier, I’m here to help. We have a team of experts who can provide you with customized solutions based on your specific application requirements. Whether you’re using the motor in a factory automation system, a robotics application, or any other field, we can work with you to reduce the EMI and ensure the smooth and reliable operation of your motor.<\/p>\n

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If you’re interested in our AC servo motors or need more advice on reducing EMI, don’t hesitate to reach out. We’re always happy to have a chat, answer your questions, and discuss how we can meet your needs. Let’s work together to make your motor applications as efficient and interference – free as possible.<\/p>\n

AC Servo Motor<\/a> References:<\/p>\n