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| How to choose common mode choke for reducing EMI due to vibration motor |
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| Sai teja:
Hi , In my application, I am using cointype vibration motors and ERM vibration motors for giving vibration alerts. As per the reference provided below, a common mode choke could be placed to reduce EMI and improve EMC. However the specifications of the common mode choke are not provided. Can any one guide me through the process of selecting the common mode choke for vibration motor? https://www.precisionmicrodrives.com/content/ab-005-electromagnetic-compatibility-emc-emi-for-vibe-motors/ Specification of ERM vibration motor : Rated Voltage : 8V RPM : 7500 Operating current : 350 milli amps Specification of cointype vibration motor : Rated Voltage : 5V RPM : 12000 Operating current : 100 milli amps Someone help me in this regard. |
| TimNJ:
I don't know anything about ERM vibration motors, but, I think you should start by analyzing the current EMI profile of the device + driver and try to identify the problem frequencies. Once you understand what your problems are, you can better select or design a component to help solve it. |
| DaJMasta:
Do you already have the cap very close to the motor terminals? From the link you provided, a 100nF MLCC cap alone seems to do a great job as a start. Good decoupling of the motor driver could also go a long way to keeping noise out of the power system. |
| Sai teja:
I placed cap as shown in the reference. I am wondered how to choose choke for motor. |
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