SU1415396A1 - Electric drive with monitored parameters - Google Patents

Abstract

The invention relates to electrical engineering and can be used to measure and control electric drive parameters. The aim of the invention is to improve the reliability of the actuator. For this, the outputs of the speed sensors 6 and current 7 are connected to the inputs of adders 8.9, the second input of which is connected to the outputs of model 13. The outputs of adders 8.9 are connected to the inputs of comparators 10, 11. The second inputs of comparators 10.11 are connected to the outputs of blocks 14 , 15 speed and current error settings. When the sensors work properly, 6.7 signals of speed and current are fed to the inputs of the corresponding regulators 2.3. In case of failures of 6.7 speed or current sensors, feedback signals are fed to the inputs of the corresponding 2.3 regulators from the model 13 outputs. When sensors 6.7 and sensors 13 in the model 13 are functioning properly, feedback signals are fed to the control inputs. 2.3 torus with 6.7 sensors. 1 il. WITH/)

Description

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This invention relates to electrical engineering and can be used in direct current drives,

The purpose of the invention is to test the reliability of the electric drive.

The drawing shows a diagram of the drive.

The electric drive with parameter control contains successively connected setpoint 1, speed and current controllers 2 and 3, converter 4 and direct current electric motor 5, speed and current sensors 6 and 7, the outputs of which are connected to the first inputs of the first 8 and second, respectively, 9 Szgmmatorov, two comparator 10 and 11, the outputs of which are connected to the inputs of the display unit 12, the model 13 of the converter 4 and the electric motor 5, the speed and current outputs of which are connected to the second inputs of the first 8 and second 9 of the adders, respectively, inputs Section 13 is connected to the output of current regulator 3, the device also contains blocks 14 and 15 of the speed and current error settings, the outputs of which are connected to the first inputs of the first 0 and second 11 comparators, respectively, the first 16 and the second 17 switching keys, the outputs of which are connected to the feedback inputs of speed controller 2 and current regulator 3, respectively, two closing switches 18 and 19, whose inputs are connected to the outputs of the first 10 and second 11 comparators, respectively, and the outputs are connected to the control inputs of the first 16 and second 17 to mutating keys, respectively, the first and second information inputs of the first switching key 16 are connected to the output of speed sensor 6 and the speed output of model 13, respectively, the first and second information inputs of the second switching key 17 are connected to the output of current sensor 7 and to the current output of 13, respectively , the outputs of the first 8 and second 9 adders are connected to the second inputs of the first 10 and second 11 comparators, respectively, the control inputs of the first 18 and second 19 closing keys are connected to the speed and shackles input model 13, respectively,

Model 13 of the thyristor converter 4 n of the electric motor 5 includes the first aperiodic link 20,

5 0 5 Q

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modeling converter, connected in series the third adder 2I and the second aperiodic link 22, modeling the root target of the electric motor, serially connecting the fourth adder 23 and integrator 24, simulating the mechanical movement of the electric drive, block of 25 coefficients connected between the input of the third adder 21 and the output of the integrator 24, which is Model 13 speed output, load torque setpoint block 26, connected to the input of the fourth adder 23, another input of which is connected to the output of the second apery single link 22, which is a side exit model 3.

The drive works as follows.

The setting signal I through the speed controllers 2 and current 3, the thyristor converter 4 goes to the electric motor 5. In the case of the normal operation of the speed sensors 6 and current 7, their signals through the keys 16 and I7 go to the inputs of the corresponding controllers 2 and 3.

At the same time, the signal from the output of current regulator 3 is fed to a model 13 of a thyristor converter 4 and an electric motor 5.

The signal of the calculated speed from the output of the model 13 and a signal proportional to the measured speed from the output, and the speed sensor 6 are fed to the inputs of the first adder 8, the output signal of which

Ui K, (n „- Pr),

where K is the proportionality coefficient;

п „- measured speed; n J - calculated speed; The signal and at the input of the first comparator 10 is compared with the output signal and the speed error setting block 14.

The error in the calculation of the velocity is due to the inertia moments that change during operation, the resistance of the core circuit, and the load moment.

The value of U / j is chosen so that during normal operation 1 U7 is provided.

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in case of failure of the speed sensor 6, its signal disappears and

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At the same time, at the output of the first comparator 10, a signal is generated that switches the key 16 through the second key 18 and turns on the display unit 12.

The signal of the calculated speed through the second input of the key 16 is fed to the input of the controller 2 speed, providing speed control of the electric motor 5.

If there is a failure in the model 13 of the thyristor converter Ai g of the electric motor 5 when the speed sensor 6 is intact and the signal at the iTHOM output-model 13 is absent, the switch 18 opens and when the first comparator 10 is triggered, the switch 16 does not switch to the regulator input 2 speeds the signal comes from speed sensor 6.

The signal of the calculated current from the current output of the model 13 and a signal proportional to the measured current from the output of the current sensor 7 are fed to the inputs of the second adder 9, at the output of which a signal is generated

and, Кз („,) where K- is the proportionality coefficient;

| C - the measured current; ig - calculated current.

The signal U at the input of the second comparator 11 is then compared with the signal Uj of the current error setting unit 15.

The value of U is chosen so that during normal operation of the current sensor 7, the second comparator 1I does not work: Ultrasonic Uy.

If current sensor 7 fails, its signal disappears I) 7, U.

At the output of the second comparator 11, a signal is generated that switches the key 17 through the key 19 and switches on the display unit 12.

The signal of the calculated current through the input of the switch 17 is fed to the input of the current regulator 3, providing current regulation.

If the model 13 fails, the thyristor converter 4 and the electric motor 5 and regularly 1 current sensor 7 disappears, the signal at the output of model 13 disappears, the key 19 opens, and when the second comparator 11 is triggered, the third

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key-17 does not switch. The signal from the output of the current sensor 7 is fed to the input of the current regulator 3.

Thus, a comparison of the calculated and measured speed and current signals eliminates false triggering of the device when one or both sensors fail, and connecting feedback channels in case of sensor failures to the model 13 of the thyristor converter 4 and the electric motor 5 makes it possible to increase the reliability of the electric drive, as it provides speed and current to within the error of calculating the speed and current signals.

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Claims (1)

Invention Formula An electric drive with parameter control, containing serially connected setting knob, speed and current controllers, converter, :), the output of which is connected to the core winding of the DC motor, speed and current sensors of the motor rod, the outputs of which are connected to the first inputs of the corresponding} 1no first and second adders, two comparator. Pa, the outputs of which are connected to the inputs of the identification unit 1, a model of a thyristor converter and an electric motor, whose speed and current OUTPUT are connected to the second inputs of the first and second adders, respectively, the model input is connected to the output of the current regulator, characterized in that, in order to increase reliability electric drive, blocks of settings are entered into it. errors in speed and current, the outputs of which are connected to the first inputs of the first and second comparators, respectively, the first and second switching keys, the outputs of which are connected to the feedback inputs of the speed controller and the current controller, respectively, two closing keys, the inputs of which are connected to the outputs of the first and second comparators, respectively, and the outputs are connected to the control inputs of the first and second switching keys, respectively; the first and second information inputs of the first switching key are connected sootvetstven1 about to exit speed sensor and high-speed output of the model, the second and second infor51) 53966 The secondary inputs of the second commutating inputs of the first and primary switches, respectively, are connected respectively to the second comparators, while the control outputs from the current sensor and the current inputs of the first and second closing outputs of the model, the outputs of the first and keys are connected respectively to the second adders second-speed and current model outputs.