FIELD: machine-tool industry. SUBSTANCE: device is characterized by the use of mechanic moment setter, sensor 20 for sensing position of frame 13 of the mechanic moment setter. Rotor 1 of the device is made in the form of ring 2, an inductor is made in the form of a magnetically conductive disk with permanent magnets, a magnetic core is made in the form of U-shaped permanent magnets closing a magnetic flux of the rotor. The device furthermore has a control system for regulating speed in response to the signals from position sensor. EFFECT: enhanced accuracy and reliability. 5 dwg
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