Abstract:There are known DC and AC electric drives with excitation control, containing negative feedback circuits for speed and flow derivative.In such drives, with an increase in the number of elements included in them, the efficiency always decreases proportionally to the number of links included in them. That is, if the power supplied to the drive motor is P= I × U, , then the power on the drive motor shaft will be equal to:

P1 = P×kd , where

kd - efficiency of the drive motor.

The generator will supply the following power:

Pg= P ×kd ×kg , where

kg - generator efficiency.

Further, the consumed power will also decrease as the number of links included in the chain with other consumers increases.The device described below is related to electric drives with speed feedback.The drive uses a parallel oscillatory circuit in which current resonance is achieved. This parallel oscillatory circuit has a built-in brushless anchor of a direct current motor DCm, which is powered by a brushless anchor of an alternating current generator G, made according to the synchronous generator scheme.The anchor of the generator G and the motor DCm are on the same shaft, forming a single system that is driven by the drive motor DM. When the current is resonant in the parallel oscillatory circuit, the active current in the branched section of the circuit where the anchor of the motor DCm is located can be many times greater than the active current in the unbranched section of the circuit where the anchor of the generator G is located.