Model BFC15030 filter card has been designed to complement ADVANCED MOTION CONTROLS servo amplifiers. This output filter card contains three inductors rated at 300uH Inductance, 30 amps continuous current.

Inductive filter cards have two typical applications:

1.  To increase the inductance to meet the minimum load inductance requirement of ADVANCED Motion Controls servo drives.

Some motors have inductances that are less than the minimum load inductance requirement for the servo drive. For example, “basket-wound” and “pancake” motors do not have a conventional iron core rotor so the winding inductance is usually less than 25 μH. For this type of application the filter card should be sized so the total inductance of the motor plus filter card meets or exceeds the inductance requirements of the servo drive. The filter card must also be rated to the required current.

2.  To reduce the DV/DT of the motor outputs.

The main source of emitted drive noise is the high DV/DT (typically about 1V/nanosecond) of the drive’s output power stage. Unfiltered motor outputs can introduce noise in digital encoder signals. For applications with noise sensitive devices (e.g. video cameras, magnetic/capacitive sensors) the use of an external inductive filter card may reduce emitted noise.

Note: Most applications do not require external filters.