Hello everyone,

I am facing an issue with the operations of a circuit that is already been designed. The problem occuring is that my circuit works in an area comprising of inuction motor. If my circuit is running and suddenly the motor starts, its electromagnetic field affects the operation of the circuit for an instance and then works properly back again. Similar kind of situation occurs when the motor is switched off. I merged the circuit ground with the body ground but to no avail. Also, i tried to merge the grounds of the motor as well as of my circuit. But the situation still persists. I have shield and filters also available on my circuit but, I guess, they are also not helping me with the issue.

Kindly suggest me some other preventive measures to avoid this interference.

Thanks in advance.

 

Hello,

Can you post a schematic of the setup?

A lot of information on EMI and how to handle it can be found in the links of this EDUCYPEDIA page:

http://educypedia.karadimov.info/electronics/emc-emi.htm

Bertus

 

induction motors do not radiate any emi, the problem might be high current draw on startup. have you monitored the voltage supply for your circuit when the motor starts up?

 

This is an article on equi-potential bonding that may help.
SiemensGND
Particularly if the circuit in question is Not directly part of the AC motor control.
Max.