The claimed device relates to electrical engineering, namely - to the actuator AC, and may be used in rotary actuators and flow production lines, machines and mechanisms in various industries.; The technical result achieved by the claimed device:; - improving reliability of the device;; - increasing the braking intensity in the range of medium and low engine rotation rpm;; - improving measurement accuracy and fixation zero speed;; - reducing the peak load on the drive line components (mechanism) in the beginning of braking.; Device for braking three-phase induction motor, comprising: a common negative and the first positive supply rail, the brake contactor (TC) with the first, second and third make contact (ZK), the first relay ZOC braking thyristor (CT), a shunt diode (SD) anodes which are combined bus cathode stepper motor through the first LC TC is connected to one phase of the stator of the motor winding (SOD), CT cathode is coupled via series connected capacitor, an adjustable resistor (RR), a diode, the cathode to the RR, the first resistor and ZK first p le to the anode of the TT, and the bus between the condenser and the PP is connected through a Shockley diode and a second resistor to a control CT electrode pulser control angular velocity (IDUS), for example, inductive coupled with the appropriate polarity to the common and first positive supply rails (WS), driver braking pulse width (FSHIT) with two control inputs - differential and line and its output connected to the first relay provided with dopolnitelnm changeover contact (PC), the pulse width shaper brake contactor (PN TK) with a control input, comprising a second relay ZOC driver braking pulse width of the second stage comprising a third relay with pervm and second RK, wherein the positive terminals of all formers combined second bus and connected through the contacts external logical brake control circuit to the first positive WB, first RK third relay connected in parallel with the RR tire between the anodes and TT SM connected through the second LC TC with another phase ODS CT cathode connected to zero; bus mains supply and the cathode of SM via the third LC TC with one phase mains supply, the first FSHIT control input connected to the output IDUS, its second control input through RK third relay and FSHITK control input via a make PCs first relay connected to a common WS, ZK second relay is serially connected to the coil control circuit TC.; The formula of the claimed device in the development and refinement of its combination of features comprises four dependent claims.
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