SU1069114A1 - Control unit for polyphase reciprocating slip-ring motor - Google Patents

Abstract

DEVICE FOR MANAGING THE MULTIPHASE MOTOR OF THE RETURN-AND-TRANSITIONAL MOTION WITH A RING WELDING BY the aut. St. 888667, from that and so that, in order to improve efficiency, it is equipped with four additional thyristors, two of which are connected by cathodes to the anodes of the anode group of the thyristors and anodes, respectively, with the findings of the first and d + t coils, and two the others are connected by anodes to the cathodes of the cathode group of thyristors and catches, respectively, with the findings of the first and n + 1 coils.

Description

According to the main author. St. No. 888667, a device for controlling a multiphase reciprocating electric motor with an annular winding made of 2p in series and according to connected coils, containing an anodic and cathodic groups of thyristors connected through a choke to a DC power source, and an abundance of polarized node, connected to a parallel power source. / ibHo to both groups of thyristors, and equipped with (p-1) additional thyristors, switched on by the main and connecting terminals of diametrically opposite katugiek, and two encounter-parallel-connected thyristors connected between the terminals of the first and (n +1) th coils of L11

The disadvantage of the device is that in the end zones of the idling and working stroke of the engine there is no rapid damping of the magnetic field and, therefore, it has a retarding effect on the rammer, which leads to a decrease in the energy efficiency of the engine. In addition, the motor has a reduced efficiency, since the device controls the motor in such a way that when extinguished the floor, the steamed electromagnetic energy is dissipated in the stator winding itself. .

The aim of the invention is to increase the efficiency of the device.

This goal is achieved by the fact that a device for controlling a multiphase reciprocating motion motor with an annular winding made of 2n in series and according to connected coils containing anodic and cathodic groups of thyristors connected via a choke to a DC power source and a common switching node is equipped with four additional thyristors, two of which are connected by cathodes to the anodes of the anode group of the thyristors and the anodes cooTJBeTCTBeHHo with the terminals of the first and P +1 cat: line, and the other two with Uniform anodes to the cathodes of the cathode group and the cathodes of the thyristors, respectively to the first pin and Ch + i reels.,

Fig. 1 is a schematic diagram of the device as applied to an electric motor with twelve coils (2p 12); in fig. 2 - timing diagrams of control pulses of switching thyristors and timing diagrams of conductivities of the main and: additional thyristors J a on. 3 and 4 diagram of the device at switching intervals.

Motor control device reciprocating

It is driven with a stator ring winding made of serially and according to connected cat DjeK 1-12 contains an anode group of main thyristors 13-19, connected at the ends to the coil winding pins, and others through the dros.sil 20 to the positive terminal of the power source, kg1 is the one group of main thyristors 21-27, one end connected to the inter-terminal pins, and the other to the negative terminal of the power source. Zero thyristors 28-32 included in the opposite main. Two counter-parallel thyristors 33 and 34 are connected between the terminals of the first and seventh coils. The switching thyristors 35-38 are connected by a bridge circuit, the DC outputs of which are connected to the combining points of the anode and cathode groups of the thyristors, and the nepefieHHoro terminals are connected to the plates of the switching capacitor 39. Additional thyristors 40 and 41 are connected by cathodes to the anodes of the anode group of the thyristors and anodes, respectively the findings of the first and seventh coils. Additional thyristors .42 and 43 are connected by anodes with cathodes of the cathode group of thyristors and cathodes, respectively, with the terminals of the first and seventh coils.

The device works as follows.

The work cycle begins by unlocking the main thyristors 13 and 27. In this case, in the time interval i .- (Fig. 2} in both stator windings, the state is quiet. From coils 1-6 and 12-7, the current t / fj begins to flow. ( solid line in Fig. 3). The switching capacitor 39 is charged with the polarity indicated without brackets (Fig. 3). At the instant of time -tz, control pulses are applied to the switching thyristors 35 and 36, and the current-carrying main thyristors 13 and 27, a reverse voltage is applied from the switching capacitor 39, whereby the thyristors 13 and 27 are locked. The leakage through the windings closes - in the circuit of zero thyristor 33, a control pulse to which is supplied simultaneously with control pulses to switching thyristors 35 and 36. The switching capacitor 39 is recharged along the circuit: plus capacitor - switching thyristor 36 - minus source, plus source - switching choke 20 - switching thyristor 35 min. Of capacitor. After the recharging is completed, switching thyristors 35 and 3 (5 are locked. The switching capacitor 39 (the polarity after the recharge is indicated in parentheses) is prepared for the subsequent switching. At time 1 {FIG. 2) control pulses are applied to another pair of main thyristors 14 and 26. At the same time, a current begins to flow through the two semi-windings consisting of coils 2-1 and 1-1211-10-9-8 (dotted line in Fig. 3). In coils 1 and 7, the current changes direction (1d5d: on Lxi, the rest continues to flow in the original direction. Due to the fact that the -Tyristor 33 is applied, the voltage of the reverse -polarity from the lithium source is locked. time t (Fig. 2) control pulses are applied to the switching thyristors 37 and 38 and the zero thyristor 28. The main thyristors 14 and 26 lock the semi-winding currents for 1 through the zero thyristor 28 (Fig. 3). Further processes in the circuit occur similarly until thyristors 19 and 21 are disconnected, the current gx flowing in the interval is shown by a solid line (Fig. 4), which corresponds to the extreme position of the magnetic field and the runner's approach. to the final position of idling when its kinetic energy must be converted into the potential energy of the elastic deformation of the storage ring. . The thyristors 19 and 21 are locked by the reverse polarity voltage from the switching capacitor along the circuit: plus capacitor 39 commuting thyristor 36, then along one parallel branch: recovery thyristor 42 — thyristor 19, along another parallel branch: thyristor 21 - recovery thyristor 40 the switching thyristor 35 is minus the capacitor (control pulses to the regenerative thyristors 42 and 40 are supplied simultaneously with the control pulses to switch the thyristors 35 and 36). After locking the thyristors 19 and 21, a recovery circuit is formed. : thyristor 40 — choke 20 — plus source — minus source — thyristor 42 — stator half-winding (the current is shown by the dotted line in Fig. 4). The inductive contour of the stator winding is rather quickly discharged to the source (the throttle inductance is small compared to the stator winding inductance and cannot significantly slow down the quenching process of field X. When the recovery current decreases to zero, the thyristors 40 and 42 lock up. Runner, moving quickly. the magnetic field of the stator is basically slowed down only by the elastic deformation of the accumulator. At the time (Fig. 2), which precedes the start of acceleration in the opposite direction, the control pulses are again fed to the thyristors 19 and 21. The current pattern of current distribution in the stator winding (current 1d (}, 21.1 in Fig. 4) is cast and the magnetic field begins to act on the runner in the same direction as the elastic force of the storage ring, as the electric angle between the runner’s axis and The magnetic field of the stator changed sign during braking. At time t / ii, thyristors 19 and 21 are locked in the same way as other main thyristors were locked, and the current flowing in the stator winding is passed through the zero thyristor 34. Then the switching on and off tiri tori 18 and 22, 17 and 23, etc. The cycle of permutations of the motor coils ends with the disconnection of the thyristors 13 and 27 at the moment ti & preceding the stroke. The control pulses are supplied to the thyristors 31 and 43 at the same time as the pulses to the switching thyristors 37 and 38, and the process of current recovery and field quenching occurs similarly to the process considered for a time interval (5. Sequential switching of the thyristors is performed from a control system operating according to a given program ( not shown). Before switching on the device, it is necessary to carry out an initial blast of the switching capacitor, for which control pulses are sent to any pair of switching tiris This results in an oscillatory charge of the switching capacitor 39 across the circuit: plus source - switching throttle 20 - switching thyristor - switching capacitor 39 - another switching thyristor - minus source. The presence of regenerative thyristors ensures the formation of an electrical circuit for the stator disconnecting current in either magnetic field and quick quenching of the field with minimal energy dissipation, since the cut-off current is opposite to the source voltage and power, which is connected to the terminals of the capacitor .filtra and represents a recovery current.

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Claims (1)

DEVICE FOR CONTROLLING A MULTI-PHASE MOTOR OF RETURN-SURROUND MOTION WITH RING WINDING by ed. St. No. 888667, on the basis of the fact that, in order to increase the efficiency, it is equipped with four additional thyristors, two of which are connected by cathodes to the anodes of the anode group of thyristors and anodes, respectively, with the terminals of the first and n + t coils, and the other two are connected by anodes to the cathodes of the cathode group of thyristors and cathodes, respectively, with the conclusions of the first and +1 coils.