SU1494188A1 - Thyratron motor with current regulation - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to improve the weight and size parameters. In a valve motor with current control, pulse current control signals are fed alternately to the control circuits of various groups 6, 7 and keys 32-37 of frequency converter 5 through two BANE 18, 24 logic elements. This allows the switching frequency of each of the converter keys to be reduced by half frequency 5 compared to current regulation using one group of keys. 2 Il.

Description

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The invention relates to electrical technology, in particular to controllable valve motors.

The aim of the invention is to improve the mass and size parameters.

Fig. 1 is a schematic diagram of the valve motor in Fig. 2 — timing diagrams explaining the operation of its nodes.

The motor with current regulation (Fig. 1) contains an electric machine 1, the root winding with phases 2-4 of which is connected to the outputs of the bridge converter 5 frequencies on fully controlled keys forming the anode 6 and cathode 7 g of the rapp, the main inputs 8 -13 which are connected to the source 14 of the control signals, and the additional inputs are combined and form two inputs 15, 16 of the current control of the anode and cathode key groups, one of the inputs of the current control, for example 15, the anode group (6) is connected to the output 17, For example, the first logical element 18 BANKS, control | D1I input 19 - which is connected to the forward output 20 of the counting trigger 21, to the inverted output 22 of which is connected the control input 23 of the second logic element 24 BANKS. The information input 25 of the element 24 BANGE is combined with the information input 26 of the first logic element 18 BREAD and connected to the output 27 of the source 28 of the current control pulses and the counting input 29 of the counting trip- er 21. The information input of the trigger 21 is connected to the inverse of its output (5 22. The output 30 of the second logic element 24 BANGE is connected to the input 16 of the current control of the cathode group 7 of the keys of the bridge frequency converter 5 whose power inputs are connected to the power source 31.

Electrical engine 1 can be constructively

on both synchronous and asynchronous with an arbitrary number of phases (cuts. Frequency converter 6 is made on fully controllable keys 32-37 (transistor, reed switches). In this case, a bridge diode must be connected counter-parallel to each key reverse current to exclude pe1)

Q

5 0 5 0 5 d

0

five

on the key at the time of his forced locking.

The process of natural switching of the winding sections of the core can be controlled either by an open circuit (for example, when the source 14 of control signals contains a master oscillator and pulse distributor, on 2 m outputs of which control signals are formed), and also by a closed circuit (when the source 14 control signals is a rotor position sensor, on 2 hectares of which the control signals are also formed, which ensure the serial connection of the winding sections of the electrical machine core us energized to produce electromagnetic torque unidirectional).

The control of the pulse current control process can be carried out either in an open circuit, for example, when the source 28 of the current control pulses is a SIM modulator, or in a closed circuit, when the source 28 of the current control pulses contains an electrical mask current sensor and a threshold element. In the latter case, it is possible to regulate the current using the current path method.

The counting trigger 21 may be executed on the basis of a D-flip-flop, the inverse output of which is Connected to the information D-input. Logic circuits 18 and 14 BANKS can be executed on the basis of logic circuits 2-AND-NOT.

Valve motor with current regulation works as follows.

Suppose that a pulsed current regulation is carried out and the rotor of the valve electric motor moves within the inter-switching interval in which during the pauses of the current regulation (time interval t, -t, tj-t, in Fig. 2) phases 2 and 4 of the core winding are connected, for example, to the power source 31 using the keys 32 and 37 of the frequency converter 5 and the current I in them increases. This is ensured by the fact that at the outputs 8 and 11 of the source 14 of control signals, as well as at the outputs 17 and 30 of logic elements

five

BAN, there are single control signals Uj, and ,, and, and, 7, Ujo

In the time interval t, j-t, at the output 27 of the source 28 of the current control pulses there is a single signal U-. . In the current control pulse of phase 2 and 4, the windings of the core are disconnected from the power source by closing the key 37 of the cathode group 7 of the frequency converter 5. At the control input 11 of the specified key, there is no single opening signal U. In the considered time interval, the EMF of self-induction of phases 2 and 4 is discharged through the closed key 32 of the anode group 16 and the diode at the key 34 of the same group, while the motor current decreases in the specified circuit. The closed state of the key 37 is ensured by the fact that at the control input 23 of the BANCH element 24 there is a resolving single signal Ujj, and the inverted single current control pulse Uj / goes to the control circuits of the keys of the cathode group 7, blocking their activation. The open state of the key 32 of the anode group 6 is ensured by the prohibiting null signal 1 at the control input 19 of the element 18 BANCH and the output signal 17 of the element 18 is forcibly fitted with a single signal U which does not prevent the passage of the signal U g from the source 14 of the control signals control circuit key 32.

At time t with the arrival of the next pulse at the input 29 of the counting trigger 21, the levels of logic signals I o and U 77 change at the outputs 20 and 22 of the specified trigger, and at the time interval t -tg a single current control pulse U appears again, The phases 2 and 4 of the winding of the core are again disconnected from the power source, but already (unlike the previous current control pulse) by closing the key 32 of the anode group 6 of the frequency converter 5. On the control input key 32 there is no control signal. In the considered time interval, the EMF of self-induction of phases 2 and 4 is discharged through the closed key 37 of the cathode group 7 and the diode at the key 35 of the same group, the motor current I) decreases. Closed

five

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the state of the key 32 of the anode group 6 is ensured by the fact that at the control input 19 of the BANNER element 18 there is a resolving single signal and Jo and an inverted single current control pulse U, jj is fed to the control circuits of the keys of the anode group 6, blocking their activation. The open state of the key 37 of the cathode group 7 is ensured by the fact that at the control input 23 of the BANCH element 24 there is a prohibiting zero signal U and

15, the output 30 of the element 24 is forcibly installed a single signal Uj, which does not interfere with the passage of the signal and from the output of the source 14 of the control signals to the control circuit of the control switch 37.

At time t with the arrival of the next pulse at the input 29 of the counting trigger 21, the levels of the logical signals U, o and U

25 at the outputs 20 and 22 of the specified trigger and the process of alternately distributing the current control pulses between the keys of different groups of the frequency converter is repeated, starting from a moment of time similar to that described in the time interval. From the analysis of the diagrams of FIG. 2, it is clear that the switching frequency of each of the keys 32 and 37 of the frequency converter 5 in the pulsed current control mode is half the frequency of the switching current of the motor 1a.

Thus, due to the organization of alternate operation of key groups of a bridge frequency converter in current control mode, the switching frequency of each key is reduced by half without increasing their number, thereby achieving the same goal with the same energy indicators - improving the mass-size parameters of a valve electric motor regulation.

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Claims (1)

Claims of the invention A valve motor with current regulation, containing an electric machine, the phases of the core winding of which are connected to the outputs of a bridge frequency converter on fully controlled keys forming the anode and cathode groups. The main control inputs of which are connected to the outputs of the source of control signals, the additional inputs of the anode group of keys are combined and form the current control input of the anode group of keys, which is connected to the output of one logical element BANGE, the control input of which is connected to the forward output of the counting trigger, to the inverse the output of which is connected to the control input of another logical element BANGE, the information inputs of the logic elements are combined lit tj h s fs h FIG. and connected to the output of the pulse current control source and the counting input of the counting trigger, the information input of which is connected to its inverse output, so that, in order to improve the weight and size indicators, the cathode key group provided with additional inputs that are combined and form the input of the current control of the cathode group of keys to which the output of the second logical element BANGE is connected. Compiled by M.Son. Editor A.Makovska Tehred A. Kravchuk Order 4127/54 Circulation 550 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 4/5, Moscow, Zh-35, Raushsk nab. 113035 Proofreader S. Shekmar Subscription