RU132274U1 - 3-WAY COMPRESSION GENERATOR - Google Patents

Abstract

A three-winding compression generator containing an explicitly polar ferromagnetic chargeable stator with a winding between the poles and a ferromagnetic chargeable explicit-pole rotor located on the shaft with short-circuited windings located in the grooves, covering the rotor, the number of which is equal to the number of pairs of poles of the stator winding, characterized in that the rotor winding is made with , the number of pole pairs of which p is equal to the number of pole pairs of the stator winding, with the additional field winding located in the grooves between poles with an angle shift of 180 ° / p relative to the short-circuited rotor windings.

Description

The utility model relates to the field of parametric type electric machine generators with the stator winding inductance periodically changing as the rotor rotates and can be used to power electrophysical installations with powerful current pulses.

A known design of a compression generator [SU 934888 A1, IPC 5 H03K 3/00, publ. 08/15/1983, BI No. 30], containing a lined rotor and a stator with single-phase windings, two brush-collector assemblies connected to one with the beginning and the second to the end of the rotor winding, a switching power supply to create the initial magnetic flux in the gap of the generator and the load, connected in series with the stator winding, one of the terminals of which is connected to one of the brush-collector assemblies. One output of the switching power supply is connected to the load through the switch, and the other to the second brush-collector unit and through the contactor to the load.

The disadvantage of this design is the presence of sliding contacts through which it is necessary to pass the entire current pulse and all generated energy, as well as the insufficient maximum repetition rate of the current pulses with a minimum number of pole pairs of the windings.

The known design of a non-contact compression generator [Invited the compensated pulsed alternator program - a review / WLBird, WFWeldon, BMCarder, RJFoley - Proceedings of 3 rd IEEE International Pulsed Power Conference, Albuquerque, June 1981, p.134-141], containing an explicitly polar ferromagnetic charge stator with a winding located between the poles and connected to a parallel-connected switching power supply with a commutator and a load with a commutator, and a monolithic explicit-polar rotor from an electric current-conducting material with teeth, the number of which is equal to the number of pairs of poles of the stator winding.

The disadvantages of this generator are the large value of the excitation current and a significant initial energy of the magnetic field of the generator, which must be obtained from a pulsed power source, for example, from a charged capacitor bank.

Also known is the design of a non-contact compression generator [R.U 60807 U1, IPC Н02К 57/00 (2006.01), publ. January 27, 2007, BI No. 3], comprising a clearly polar ferromagnetic stator with a winding between the poles and a monolithic rotor made of an electrically conductive material with teeth, the number of which is equal to the number of pairs of winding poles, characterized in that the rotor is made with magnetic circuits fixed between the teeth.

The disadvantage of this generator is the design complexity due to a monolithic explicit pole rotor of complex shape for reliable fastening of charged magnetic cores, and this design limits the number of rotor revolutions and the frequency of the pulse repetition current pulses.

The closest technical solution is a non-contact pulse compression generator, selected as a prototype [RU 103251 U1, IPC Н02К 57/00 (2006.01), publ. 03/27/2011, BI No. 9], containing an explicitly polarized ferromagnetic charge stator with a winding between the poles and a ferromagnetic chargeable explicit-pole rotor located on the shaft with squirrel-cage windings located in the grooves, covering the rotor, the number of which is equal to the number of pairs of stator winding poles.

The disadvantage of the prototype is the insufficient maximum repetition rate of the current pulses of the stator winding, determined by the number of pairs of its poles and the number of revolutions of the rotor.

The objective of the utility model is to increase the maximum repetition rate of the current pulses of the stator winding without increasing the number of pairs of its poles and the number of revolutions of the rotor.

The task is achieved by the fact that, as in the prototype, the three-winding compression generator contains an explicit pole ferromagnetic charge stator with a winding between the poles and a ferromagnetic load-bearing explicit pole rotor located on the shaft with short-circuited windings located in the grooves, covering the rotor, the number of which is equal to the number of pairs of pole poles of the winding.

According to a utility model, the rotor is made with an additional field winding, the number of pole pairs of which p is equal to the number of pairs of poles of the stator winding, and the additional field winding is located in the grooves between the poles with an angle of 180 ° / p relative to the short-circuited rotor windings.

The achieved result will be explained by the short circuit mode of the windings of the three-winding compression generator without taking into account their active resistances.

1. The prototype with the angle of the rotor α = 0, when the inductance of the stator winding with the number of turns w _{C is} maximum L _max , the initial current of this winding i _C0 and the initial magnetic flux

created by a pulsed power supply (excitation), for example, a charged capacitor bank. When the rotor is rotated through an angle α = 180 ° / p, the short-circuited rotor windings displace the magnetic flux Ф ₀ into the grooves of the stator winding, the inductance of this winding decreases to a minimum value of L _min , providing a change in inductance

As a result, the prototype stator winding current at an angle α = 180 ° / p reaches its maximum value:

with further rotation of the rotor to an angle α = 360 ° / p, the stator winding current decreases and becomes equal to the initial current i _C0 . In this case, the maximum repetition rate of the current pulses of the stator winding is:

where n is the number of revolutions of the rotor per minute.

2. In the proposed utility model, with the angle of the rotor position α = 0, when the stator winding inductance is maximum, the initial current of the additional rotor excitation winding i _B0 e is the initial magnetic flux

are also created by a pulsed power supply (excitation), for example, a charged capacitor bank, and the additional excitation winding of the rotor has an inductance L _{B the} number of turns w _B.

From the solution of equations for flux linkages of the additional rotor field winding

and stator windings

we find the maximum values of the stator winding current i _C (α) for rotor angles α = 180 ° / p

and α = 360 ° / p

where, as a function of the angle of the rotor position α, the stator winding inductance:

as a function of the angle of the rotor position α, the mutual inductance between the stator and additional rotor windings:

i _B (α) and i _C (α) are the currents of the additional rotor excitation winding and the stator winding as a function of the angle of the rotor position α, and for α = 0 we have i _B (0) = i _B0 and i _C (0) = 0;

и k<1 - коэффициенты модуляции и связи обмоток генератора соответственно;

and k <1 are the modulation and coupling coefficients of the generator windings, respectively;

L _max = L ₀ (1 + m); L _min = L ₀ (1-m) is the maximum and minimum inductance of the stator winding at its average inductance L ₀ .

A comparison of the maximum values of the stator winding currents of the prototype (2) and the utility model (5, 6) with the same initial magnetic fluxes (1) and (4) gives the relations

where the mutual inductance parameter:

It follows from formula (7) that at an angle α = 180 ° / p, the amplitudes of the short circuit currents of the prototype i _m1 and the utility model i _{m2 are} almost the same. However, at an angle α = 360 ° / p, when the prototype has no current pulse of the stator winding, the utility model has a pulse with amplitude i _m3 ≈i _m2 ≈i _m1 at N ₂ ≈ 2N ₁ .

As a result, the proposed utility model has a maximum repetition rate of current pulses of the stator winding

those. from formulas (3) and (8) it follows that, in comparison with the prototype, in a utility model due to the placement of an additional field winding on the rotor, the maximum repetition rate of the current pulses of the stator winding increases by 1.5 times.

Figure 1 schematically shows a three-winding compression generator with the number of pairs of poles of the stator winding p = 4 at the rotor position, when the angle relative to the vertical axis is α = 0, and the stator winding inductance is maximum, and figure 2 shows the calculated current curves for short-circuit windings this generator.

The three-winding compression generator contains an explicitly polar ferromagnetic charge stator 1 with a winding 2 between the poles and a ferromagnetic load-bearing explicit pole rotor 4 located on the shaft 3 with short-circuited windings 5 located in the slots, covering the rotor 4, the number of which is equal to the number of pole pairs (p = 4) of the stator winding On the rotor 4 there is an additional field winding 6, the number of pole pairs of which (p = 4) is equal to the number of pairs of poles of the stator winding 2, and the additional field winding 6 is located in the grooves between the floor themselves with a shift by an angle of 180 ° / p = 45 ° with respect to short-circuited winding of the rotor 4. The grooves 5 of the stator 1 and the rotor 4, which are arranged windings 2, 5 and 6 in Figure 1 is not detailed.

Three-winding compression generator operates as follows. An external drive motor drives the shaft 3 and rotor 4 to a certain number of revolutions n per minute. Then, an additional current i _B (α) is supplied to the additional excitation winding 6 of the rotor 4 from the switching power supply, which at an angle α = 0 at the time of the maximum inductance L _{max of the} winding 2 of stator 1 is i _B (0) = i _B0 and creates the initial magnetic stream f ₀ . As the rotor 4 rotates, its short-circuited windings 5 displace the magnetic flux into the grooves of the stator 1 of winding 2 and the inductance of winding 2 decreases, reaching a minimum value of L _min at an angle α = 180 ° / p = 45 °. As a result, the mechanical energy of the rotating rotor 4 is converted to the electromagnetic energy of the current pulse i _C (α) of the stator winding 2 with an amplitude of i _m2 , which is the larger, the greater the change rate N _{1 of the} inductance of the winding 2. The electromagnetic energy W of the current pulse i _C (α ) with amplitude i _m2 is transferred to the load, which is connected in series with the coil 2. with a further rotation of the rotor by an angle α = 360 ° / p = 90 ° conductors additional excitation winding 6 of the rotor 4 are arranged opposite the conductors 2 of the stator coil 1. windings 2 and 6 are included in opposition, in the stator winding 2 generates the next pulse of current i _C (α) with amplitude i _m3, which is the greater, the greater the coupling coefficient k <1 and more appropriate parameter N _2> 1.

Compared with the prototype, the utility model has 1.5 times the maximum maximum pulse repetition rate f _{m2 of the} stator winding by placing an additional field winding on the rotor. According to calculations, this utility model weighing 50,000 kg with four pairs of poles (p = 4) and n = 3000 rpm when powered by an active inductive load can have: N ₂ = 2N ₁ = 200; i _B0 = 35.5 kA; Ф ₀ = 4.23 Wb; W ₀ = 152 kJ; i _m2 = i _m3 = 2.75 MA; W≈5.4 MJ; f _m2 = 300 Hz.

Claims (1)

A three-winding compression generator containing an explicitly polar ferromagnetic chargeable stator with a winding between the poles and a ferromagnetic chargeable explicit-pole rotor located on the shaft with short-circuited windings located in the grooves, covering the rotor, the number of which is equal to the number of pairs of poles of the stator winding, characterized in that the rotor winding is made with , the number of pole pairs of which p is equal to the number of pole pairs of the stator winding, with the additional field winding located in the grooves between poles with an angle shift of 180 ° / p relative to the short-circuited rotor windings.

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