К.V. Kulagin - Head of Sector, JSC «Almaz-Antey». E-mail: kulaginkonst@mail.ru I.D. Nekrasov - Head of Department, JSC «Almaz-Antey». E-mail: iidnekrasov@mail.ru А.V. Rybin - Head of Scientific Research Department, JSC «Almaz-Antey». E-mail: almaz-raw@mail.ru

The multifunction radar (MFR) shall operate both in rotation and in sector scanning modes. Thus, the azimuth drive control system must provide constant rotation rate of hardware container with a necessary accuracy and smoothness, installation of the hardware container in the specified angle and its holding in the presence of external perturbations, provide the high starting moment of the electromotor necessary for acceleration and braking of the hardware container for the preset time. Unlike the previous structures of rotating stand units (RSU) with direct current motor and force reducer, use of the gearless synchronous high-moment gated motor with excitation from permanent magnets with a broad range of operating rates allowed to improve mass-dimensional parameters, and absence of brush-collector node and force reducer in the motor increased reliability of system. In the present article the developed MFR azimuth drive control system is described. The control system consists of RSU, the two-phase synchronous high-moment gated motor, control unit and the photo-electric azimuth sensor to provide feedback on angle. The control unit incorporates control PCB assembly, two power PCB assembles with IGBT modules (one on each winding) and power supply node. In power PCB assemblies the current sensors are used to provide feedback on current. The control unit is connected with the control computer and the azimuth sensor via RS-422 channels. The control PCB assembly calculates parameters of control currents in windings of the motor according to the drive operation mode given by the control computer and acquired information from the azimuth sensor and current sensors. The assembly gives out the control signals to the power PCB assembles which provide switching on/off of the keys in the necessary sequence, therefore the cal-culated current corridor in electromotor windings is created. When operation of the drive in sector mode (positioning mode) the main feedback on the motor rotor angular position and the adjusting feedback on angular rotation rate are used. In the rotation mode with constant speed, while acceleration and braking feedback on angular rotation rate is used. As a result of development MFR azimuth drive control system meeting the given requirements regarding accuracy and the main dynamic properties was created. The microcontroller and FPGA application in the control PCB assembly provide effective solution of problems in the azimuth drive control, simplification of its adjustment and reduction of the equipment volume. The control algorithms realization is performed completely due to software.

 

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