DIRECT CURRENT MACHINE Russian patent published in 2012 - IPC H02K23/38 

FIELD: electrical engineering; direct current machines.

SUBSTANCE: direct current machine comprises a stator, an armature fixed on a rod, a contact device in the form of annular rings insulated from each other which contact with brush electrodes used for current feed and collecting from the start and the finish of the coil, end shields, a controlled solid-state switch which activates bipolar transistors and resistors between the electrodes of the emitter and the base and which is connected to its control device. The control device of a solid-state switch consists of brush electrodes which receive the control signal, a brush electrode giving the control signal, and two rings fixed on the rod and insulated from this electrode. One of these rings is made from a conductive material, while the second ring is cut into two sections, one section is made from a conductive material and connected with the solid ring of the control device, and the second section is made from insulating material. All brush electrodes are installed with the possibility to connect them with the sectioned ring and are connected with the control electrode of the semiconductor elements of the solid-state switch, while the brush electrode giving the control signal is installed with the possibility to connect with the solid ring of the control device and is connected with the brush electrodes receiving the signal at the moment of the connection of these brushes with the conductive part of the sectioned ring. Furthermore, the contact device is made in the form of four solid conductive rings. One of these rings is connected with the start of all armature coils, while all other rings are connected with the finish of the respective coils. The conductive section of the ring is made in the form of a 120° section, whereas there six electrode brushed that receive the control signal positioned with a 60° angle between them. In addition, the machine includes a relay with an option to switch the positive pole of the feeding line from the solid-state switch to the start of the coils.

EFFECT: prevention of sparking, radio interference and noise, improvement of adjusting characteristics, simplification of the device's manufacturing technique and increase of the direct current machine's efficiency.

3 cl, 10 dwg