In-process talked about creation of 4-th quadrant semiconductor PWM – switchboard and three-contour system of adjusting, which together with the commutatorless motor of direct-current with a disk rotor it is possible to use in an lift gearless electric drive. It will allow to promote reliability, simplify service, and due to enhanceable coefficient of useful effect - to economize electric power in static and dynamic modes. The flow diagram of switchboard is resulted. The experimental oscillograms of voltage and current are presented.
