The Output Choke can be used in combination with EMC Filter to reduce electromagnetic interference.
They are especially effective when the interferences radiated by the connection driver to the motor, cause disturbances in the control systems, data lines or radio and television receivers located near the installation. The setting up of the appropriate choke in the connection cable to the motor can solve this kind of problems.
Occasionally, the problems of electromagnetic compatibility can appear in an installation when the components that are part of the same control group affect each other; for example, the open control panels can produce interference on the low amplitude signal circuits of sensors. In these cases the inclusion of a toroidal inductance in the cables of the control circuit and sensors, usually solves the problem. Normally, to determine the number and situation of the additional chokes is necessary to make some tests until getting the best configuration.