What Motor Is It?

A Photo might help. I'm guessing, but it sounds like the connections for a temperature sensor. At only 30W, it's got to be a fan motor; the sensor could help the control unit know when to turn the fan on, or possibly shut the whole thing down if it overheats.

I do not know about this motor specifically, but generically speaking, Vcc is common(neutral or circuit board ground reference). Vout, obviously, is an output signal.You say 3 speeds, perhaps this is a built in tachometer generator that sends signal to the controller board to control speed.A feedback reference can also be generated by monitoring the commutator phases to determine speed and load.

This motor may run fine without the PCB, but it would only have a single speed.Hook it up and ignore the extra 3 wires.Monitor current and see if it within an acceptable value.If so, no problem.Tape up the extra wires and use it as is.

While running, you could also check the voltage output from Vout to Vcc.

More info about the controller board would be helpful.

I haven't seen this before so keep that in mind,however, if the motor were mine I would be expecting Vcc to be DC operating voltage to be fed to some solid state ckt and Vout would be the output from said circuit. Perhaps there is a simple speed measuring ckt inside the motor which needs some dc operating voltage connected to Vcc using the Gnd as common and which provides an output voltage proportional to motor speed. Once again I am only making an educated guess as if the motor were on my bench so keep that in mind.

GA

V_CC is the common collector voltage

Although it's described there as just an IC power input: the positive rail on a PCB is often labeled V_CC.

I regret not to have written all the data from the motor (in the hope the model would be enough - would look in Google and see, but...nothing in Google).

2 plugs with 3 leads each; the 3 thinner leads (labeled as described in my OP) according to the drawing on the mot's side came from smth marked as either RG or RD (forgot!).

I run it on the 3 other leads through the cap as had shown the drawing, current 0.2 (missed to measure V on the other, "strange" leads).

I told them the bearings needed to be changed. Will ask them to bring me to the site they took the mot from, to have a look at the unit's PCB (they said the fan scarcely turned there then). . If they take me, I "ll surely inform you what would be found about the strange mot's control.