There is an increasing number of high/ultra high speed drives required by the industry. The theory offers the rules how to drive fast motors, however not all them are easily applicable in the real word. The significant issue is that the rules requires a pretty powerful device to be enough fast to control fast motors. The presentation offers the comparison of the theory with the experiences out of the customer project targeting the high speed motors controlled by a less powerful devices, where the less powerful controller is a pretty challenge within the overall task.