Wiring a 2 pole three-phase DB motor to a VFD
If by "DB" you mean the motor had a mechanical brake (you mentioned a rectifier), then you CANNOT leave that brake connected to the motor terminals when using a VFD on the motor, you must separate them and run separate wires to the brake coil. Then you must develop logic in your controls that will energize the brake coil BEFORE the VFD runs the motor (brake coils on motors operate against a spring applied brake, so energizing the coil RELEASES the brake). Some VFDs will include this logic capability in the VFD using an Output Relay, some (cheap versions) do not, it is up to you to investigate and implement this fully. 

If you don't understand what I have just posted, you should probably not engage in applying a VFD to a brake motor...