SU995244A2 - Gate-type dc electric drive - Google Patents

Description

The invention of O1; is carried out in electric engineering and can be used in electric drives with valve converters.

According to os ovnszhu auth.St. 817950 is known for valve-driven electric actuators with sequentially switching on a current reference node, linearization assembly, adder, linear converter, electric motor, EMF sensor connected to the soylate plate, reference element, inputs of which are connected to the outputs of the current sensor and linearization assembly, and the output through integrator with reset key and continuous mode key - to the adder, the control circuit of the reset key is connected to the common control pulse bus, and the control circuit of the continuous key is connected to the current sensor th mode converter ClJ.

The disadvantage of the known electric drive is the low accuracy of maintaining a given speed when the static load changes on the motor shaft.

The purpose of the invention is to improve the accuracy of controlling the speed of the drive.

The goal is achieved by additionally introducing a second integrator with a reset key, an electric motor speed sensor, a memory node, an inverter, and a second adder, the output of the speed sensor connected to the inputs. the memory node, the inverter and the job node, the output of the second totalizer is connected to the input of the linearization node, and the inputs are connected to the outputs of the second integrator of the memory node and the inverter, the second integrator input is connected to the current sensor, and the control circuit of the memory node and the reset key the second integrator is connected to a common control pulse bus.

20

The drawing shows the block diagram of the drive.

The electric drive contains a current setting node 1, a static moment compensation node 2, a linearization node 3

25 current task, current cor. Sensor .4, first integrator 5 with reset reset, 6 key continuous switch 6, EMF sensor 7, power converter 8 adder, valve converter 9f electric motor 10, speed sensor 11, current mode sensor 12. The static moment compensation unit 2 includes a second integrator 13 with a reset key, a second adder 14, an inverter 15 and a memory unit 16, the outputs of the current task unit 1 and the static moment compensation unit 2 are connected to the input of the linearization unit 3, and the output of the node 1 are connected in series adder 8, valve converter 9, engine 10, speed sensor 11. The output of the sensor 4 of the motor current is connected to the inputs of the first and second integrators 5 and 1 with reset keys. The output of the linearization unit 3 is also connected to the input of the first integrator 5, the integrator output 5 is connected via a continuous mode key controlled by the current mode sensor 12 and connected to the adder 8. The speed sensor 11 output is connected to the inputs of the memory node 16, inverter 15 and node 1 current settings, outputs of the integrator; 13, the inverter 15 and the memory node 14 are connected to the inputs of the second adder 14. The control circuits of the reset keys of the integrators 5 and 13, as well as the control circuit of the memory node 16 are connected to the common control pulse bus. The output of the sensor 7 EMF is connected to the adder 8. The drive operates as follows. The speed error signal AV after amplification (conversion) in the current setting node 1 and the linearization node 3 is fed to the input of the adder 8 together with the signals of positive feedback on the EMF and the voltage drop compensation signal Uf in the in-loop core current mode . The voltage from the output of the adder 8 is supplied to the input of the gate converter 9. In addition, a signal from the output of the second adder 14 of the static torque compensation unit 2 is fed to the input of the linearization unit 3. The static moment compensation unit is built on the basis of the known relation Ki-- ihj w, (t) dt, (1) where I is the moment of inertia on the drive shaft; t. -tj Tj - converter ventilation interval; u), 0) drive speed value; Mr Izha-y - the resultant moment on the drive shaft; Mj-T - static load moment; M.Kj (|, electromagnetic moment of the engine) K - coefficient of proportionality Ijj - current of the engine. Since the period of change of the static moment is usually much longer, the drain (1) can be written as. j and z-mstT. (2) -dcTtrnf-dli + tr (i + -f ;. i + 1 1. Fl. - the average value of the article (14-1) e1 + 1) of the static and total current of the engine for 1 + 1 interval of ventilation; auj, is the increment of the speed over the i + l interval of ventilation. A signal proportional to 1 is received at the output of the integrator 13, and a signal proportional to whether) - is generated by the memory node 16 and the inverter 15. Thus, the output of the second sensor 14 has a signal proportional to the static load on the drive shaft. This signal, when the load is changed or when the drive starts to move, has a forcing effect on the valve converter, as a result of which the accuracy of maintaining a given speed is increased. i of the invention. DC motorized electric current according to auth.St. No. 817950, differing in the fact that, in order to improve the speed control accuracy, a second integrator with a reset key, a motor speed sensor, a memory node, an inverter, and a second sucmator are entered into it, the speed sensor output being connected to the inputs of the memory node, the inverter and the node setting the current, the output of the second adder is connected to the input of the linearization node, and the inputs are connected to the outputs of the second integrator of the memory node and inverter, the input of the second integrator is connected to the current sensor, and the control circuit of the memory node and the reset key torogo integrator connected to the common bus controlled pulse constituents. Sources of information taken into account in the examination 1. USSR author's certificate 817950, class, N 02 P 5/00, 1979.

Claims (1)

Valve DC electric motor »817950, characterized in that, in order to increase the accuracy of speed control, a second integrator with a reset key, an electric motor speed sensor, a memory unit, an inverter and a second supervolator are introduced into it, and the output of the speed sensor is connected to the inputs of the memory unit, inverter and node the current setting, the output of the second adder is connected to the input of the linearization unit, and the inputs are to the outputs of the second integrator of the storage unit and inverter, the input of the second integrator is connected to the current sensor, and the control circuit of the storage unit and the reset key the second integrator connected to a common bus control pulses.