Hi Koraks,
Thanks for your fast reply. I purchased 0,2 A; 3V-6V, 18000-35000 rpm dc motors. I've connected them with some H-bridges and a 6V, 100mA PSU. These motor are way to weak..
Shouldn't I take a look into geared motors to get more torque?
Not if you want speed! 
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You can't expect full speed or power when driving a 200mA motor with a 100mA power supply.
The power supply needs to be able to supply the motor stall current. The motor will draw stall current, briefly, every time it starts. 0.2A is probably the no load current, stall current can be 10 time (or more) the no load current. As I pointed out in the previous thread with this same question.
What is the motor driver. If it is a L293 or L298, they drop 2 to 4V of the motor power in their output stage meaning only 4V, at best, of a 6V supply gets to the motor. As I pointed out in the previous thread with this same question.