RU2684167C2 - Radiation power current source with low radiation coefficient - Google Patents

Abstract

FIELD: electrical engineering.SUBSTANCE: invention relates to electrical engineering and can be used in high-power DC power supply with low ripple ratio for generating DC voltage. In constant-voltage source of high power with low ripple coefficient on rotor there are permanent magnets that perform function of poles, and stator, on which windings are located. In the method, the rotor is made by a forcibly rotating external source of mechanical energy to generate AC voltage in the stator windings. Number of stator windings on stator is even and four times more than number of pairs of poles on rotor. At serial opposite connection of diametrically opposite stator windings the end of the first winding is connected to the end of the third winding, beginning of the first winding is connected to the first input of the rectifier bridge, the end of the second winding is connected to the end of the fourth winding, beginning of the second winding is connected to the second input of the rectifier bridge, the beginning of the third and fourth windings are combined into a unit and connected to the third input of the rectifying bridge. At parallel co-directional connection of diametrically opposite stator windings the beginning of the first winding and the end of the third winding are combined and connected to the first input of the rectifying bridge, beginning of the second winding and end of the fourth winding are combined and connected to the second input of the rectifier bridge, the end of the first winding and the beginning of the third winding are combined and connected to a unit with combined end of second winding and beginning of fourth winding and connected to third input of rectifying bridge. Rectifier bridge is three-phase.EFFECT: device allows generation of voltage at absence of isolated constant voltage source on each winding with provision of increased power and small coefficient of pulsation.1 cl, 10 dwg

Description

The present invention relates to direct voltage sources using an alternating voltage generator and can be used to generate constant voltage.

Known DC machine containing the excitation winding located on the stator of the machine, and the armature winding connected through a movable contact to the output terminals of the machine. To generate a constant voltage using this electric machine, it is required to set the rotor in motion due to the action of external forces and apply a constant voltage to the field winding (Kuznetsov, MI, Fundamentals of Electrical Engineering. - M.: Higher School, 1964. - P. 350, 352).

The main disadvantage of a DC machine operating in generator mode is the presence of a movable contact between the armature winding and the output terminals of the machine, this leads to a distortion of the output DC voltage, which leads to an increase in the ripple coefficient of the rectified voltage and reduces the reliability of the machine. Also, for the operation of a DC machine operating in the generator mode, it is necessary to communicate electric energy to the field winding located on the stator to create a magnetic field, which leads to a decrease in the energy efficiency of the generator.

The closest to the proposed invention in terms of technical nature and the achieved result (prototype) is an adjustable constant voltage source containing a rotor, on which there are permanent magnets that perform the function of poles, and a stator on which the windings are located, while the rotor is made forcibly rotating an external mechanical source energy for guidance in the stator windings of alternating voltage, while the number of windings on the stator is even and equal to the number of poles on the rotor, diametral o opposite the first and third windings, as well as diametrically opposite second and fourth windings are connected in series, with the beginnings of the first and second windings connected to the rectifier bridge, the ends of the third and fourth windings combined, and the beginnings of the third and fourth windings connected with the ends of the first and second windings respectively (Patent RU 179619 H02K 21/14).

The main disadvantage of this device is the generation of direct voltage with a high ripple coefficient, this requires the use of special electric filters, which leads to a complication of the design, and, consequently, to a decrease in the reliability of the generating device.

The presented invention solves the problem of generating a constant voltage with a low ripple coefficient and high power.

The solution to this technical problem is achieved by the fact that in the DC voltage source of increased power with a low ripple coefficient, containing a rotor, on which there are permanent magnets that act as poles, and a stator on which the windings are located, the rotor is made forcibly rotating an external source of mechanical energy for guidance in the stator windings of alternating voltage, the number of stator windings on the stator is even, characterized in that the stator windings are four times more than the number of pa p poles on the rotor, and when the diametrically opposite stator windings are connected in series, the end of the first winding is connected to the end of the third winding, the beginning of the first winding is connected to the first input of the rectifier bridge, the end of the second winding is connected to the end of the fourth winding, the beginning of the second winding is connected to the second input of the rectifier the bridge, the beginning of the third and fourth windings are combined into a node and connected to the third input of the rectifier bridge, with a parallel codirectional connection diametrically of the opposite stator windings, the beginning of the first winding and the end of the third winding are combined and connected to the first input of the rectifier bridge, the beginning of the second winding and the end of the fourth winding are combined and connected to the second input of the rectifier bridge, the end of the first winding and the beginning of the third winding are combined and connected to a unit with a combined end the second winding and the beginning of the fourth winding and connected to the third input of the rectifier bridge, while the rectifier bridge is made three-phase.

Ensuring the generation of voltage in the absence of an isolated source of constant voltage on each winding, with obtaining increased power and a small ripple coefficient, is due to the grouping of diametrically opposite windings in pairs with a series of their opposite connection or with their parallel directional connection, which allows you to summarize the voltage or current created on them. Thus, the achievement of increased power and a small ripple coefficient is achieved by generating alternating voltage cosine and sinusoids by the generator, and passing them through a three-phase rectifier bridge in accordance with the proposed connection of the windings.

The number of stator windings is even and four times greater than the number of pole pairs on the rotor is optimal, since this allows you to get both a cosine and a sinusoid of alternating voltage. By decreasing the number of stator windings, either a cosine or a sinusoid of alternating voltage can be obtained.

The invention is illustrated in the drawing, where in FIG. 1 shows the arrangement of permanent magnets on the rotor and windings on the stator; in FIG. 2 is a schematic diagram of a DC voltage source of increased power with a small ripple coefficient when the stator windings are connected in series; in FIG. 3 is a schematic diagram of a DC power source of increased power with a small ripple coefficient with parallel connection of the stator windings; in FIG. 4 shows graphs of the dependence of the generated voltage on the stator windings on time; in FIG. 5 shows a sine wave and a cosine wave of the generated voltage between the input and output of the stator windings connected in series; in FIG. 6 - a sine wave and a cosine wave of the generated voltage between the input and output of parallel connected stator windings; in FIG. 7 shows the procedure for turning on the rectifier bridge thyristors when connecting stator windings in series; in FIG. 8 - order of inclusion of rectifier bridge thyristors with parallel connection of stator windings; Fig. 9 shows the voltage across the load when the stator windings are connected in series; in FIG. 10 - voltage at the load with parallel connection of the stator windings.

In addition, the following notation is used in the drawing:

- L1-L4 - stator windings;

- T1-T6 - thyristors;

- N is the north pole of the permanent magnet;

- S is the south pole of the permanent magnet;

- начала обмоток;-

- start windings;

- P is the rotor;

- C - stator;

- U is the generated alternating voltage;

- Ud is a constant voltage;

- t is time;

- t1-t7 - time intervals.

A DC source of increased power with a low ripple coefficient contains a rotor on which permanent magnets are located that serve as poles, and a stator on which the windings are located. The rotor is made forcibly rotating an external source of mechanical energy to induce alternating voltage in the stator windings. The number of stator windings on the stator is even and four times greater than the number of pole pairs on the rotor. When the diametrically opposite stator windings are connected in series, the end of the first winding is connected to the end of the third winding, the beginning of the first winding is connected to the first input of the rectifier bridge, the end of the second winding is connected to the end of the fourth winding, the beginning of the second winding is connected to the second input of the rectifier bridge, the beginning of the third and fourth windings are knotted and connected to the third input of the rectifier bridge. With a parallel co-directional connection of diametrically opposite stator windings, the beginning of the first winding and the end of the third winding are combined and connected to the first input of the rectifier bridge, the beginning of the second winding and the end of the fourth winding are combined and connected to the second input of the rectifier bridge, the end of the first winding and the beginning of the third winding are combined and connected into a node with the combined end of the second winding and the beginning of the fourth winding and connected to the third input of the rectifier bridge. The rectifier bridge is three-phase.

An example of the implementation of the proposed constant voltage source of high power with a low ripple coefficient, containing two pairs of diametrically opposite stator windings connected in series in the opposite direction, and one pair of poles.

An increased voltage direct current source with a low ripple coefficient contains a rotor 1 (P), on which a permanent magnet 2, which acts as a pair of SN poles, is located, and a stator 3 (C), on which four windings are located: the first winding 4 (L1), the third winding 5 (L3), second winding 6 (L2), fourth winding 7 (L4). Thus, the number of windings - 4 (L1), 5 (L3), 6 (L2), 7 (L4) - on the stator 3 (C) is even and four times more than the number of pole pairs on the rotor 1 (P). The rotor 1 (P) is made forcibly rotating an external source of mechanical energy for guidance in the windings 4 (L1), 5 (L3), 6 (L2), 7 (L4) of the AC stator.

Diametrically opposed, the first winding 4 (L1) and the third winding 5 (L3) are connected in series with each other; diametrically opposite, the second winding 6 (L2) and the fourth winding 7 (L4) are connected in series in the opposite direction. The end of the first winding 4 (L1) is connected to the end of the third winding 5 (L3), the beginning of the first winding 4 (L1) is connected to the first input 8 of the rectifier bridge. The end of the second winding 6 (L2) is connected to the end of the fourth winding 7 (L4), the beginning of the second winding 6 (L2) is connected to the second input 9 of the rectifier bridge. The beginning of the third winding 5 (L3) and the fourth winding 7 (L4) are combined into a node 10 and connected to the third input 11 of the rectifier bridge.

The first input 8 of the rectifier bridge is connected to thyristors 12 (T1) and 13 (T2). The second input 9 of the rectifier bridge is connected to thyristors 14 (T3) and 15 (T4). The third input 11 of the rectifier bridge is connected to thyristors 16 (T5) and 17 (T6).

The output 18 of the rectifier bridge is connected to the input of the load 19 (R), and the output 20 of the rectifier bridge is connected to the output of the load 19 (R). The rectifier bridge is made three-phase (Fig. 1, 2).

An example of the implementation of the proposed constant voltage source of high power with a low ripple coefficient, containing two pairs of diametrically opposite stator windings connected in parallel with the same direction, and one pair of poles.

An increased voltage direct current source with a low ripple coefficient contains a rotor 1 (P), on which a permanent magnet 2, which acts as a pair of SN poles, is located, and a stator 3 (C), on which four windings are located: the first winding 4 (L1), the third winding 5 (L3), second winding 6 (L2), fourth winding 7 (L4). Thus, the number of windings - 4 (L1), 5 (L3), 6 (L2), 7 (L4) - on the stator 3 (C) is even and four times more than the number of pole pairs on the rotor 1 (P). The rotor 1 (P) is made forcibly rotating an external source of mechanical energy for guidance in the windings 4 (L1), 5 (L3), 6 (L2), 7 (L4) of the AC stator.

Diametrically opposed, the first winding 4 (L1) and the third winding 5 (L3) are connected in parallel codirectionally; diametrically opposed, the second winding 6 (L2) and the fourth winding 7 (L4) are connected in parallel codirectionally. The beginning of the first winding 4 (L1) and the end of the third winding 5 (L3) are combined and connected to the first input 8 of the rectifier bridge. The beginning of the second winding 6 (L2) and the end of the fourth winding 7 (L4) are combined and connected to the second input 9 of the rectifier bridge. The end of the first winding 4 (L1) and the beginning of the third winding 5 (L3) are combined, connected to a node 10 with the combined end of the second winding 6 (L2) and the beginning of the fourth winding 7 (L4), and connected to the third input 11 of the rectifier bridge.

The first input 8 of the rectifier bridge is connected to thyristors 12 (T1) and 13 (T2). The second input 9 of the rectifier bridge is connected to thyristors 14 (T3) and 15 (T4). The third input 11 of the rectifier bridge is connected to thyristors 16 (T5) and 17 (T6).

The output 18 of the rectifier bridge is connected to the input of the load 19 (R), and the output 20 of the rectifier bridge is connected to the output of the load 19 (R). The rectifier bridge is made three-phase (Fig. 1, 3).

The work of the proposed constant voltage source of increased power with a low ripple coefficient, containing two pairs of diametrically opposite stator windings connected in series in the opposite direction, and one pair of poles, is as follows.

When the rotor 1 (P) rotates, a permanent magnet located on it with one pair of S - N poles in the stator windings 4 (L1), 5 (L2), 6 (L3), 7 (L4) creates an alternating voltage (Fig. 4). Between the inputs 8, 9, 11 of the rectifier bridge, an alternating and increased voltage is applied, and a sinusoid with an increased voltage value appears on the windings 4 (L1), 5 (L3), and a cosine wave with an increased voltage appears on the windings 6 (L2), 7 (L4) the voltage value, thereby simultaneously applying to the rectifier bridge both a sine wave and a cosine wave of alternating voltage (Fig. 5). Moreover, at time t1, thyristors 12 (T1), 15 (T4) are open; at time t2, thyristor 15 (T4) is closed, and thyristors 12 (T1), 14 (T3), 17 (T6) are open; at time t3, thyristors 12 (T1), 17 (T6) are closed, and thyristors 13 (T2), 14 (T3) are open; at time t4, thyristor 14 (T3) is closed, and thyristors 13 (T2), 15 (T4), 16 (T5) are open; at time t5, as at time t1, thyristors 12 (T1), 15 (T4) are open, and thyristors 13 (T2) and 16 (T5) are closed; in subsequent periods of time there is a repetition of the operation of the rectifier bridge (Fig. 7). From the outputs of the rectifier bridge, the converted voltage is supplied to the input 18 of the load 19 (R) and to the output 20 of the load 19 (R) (Fig. 9). From FIG. Figure 9 shows that the rectified voltage has a small ripple coefficient.

The work of the proposed constant voltage source of high power with a low ripple coefficient, containing two pairs of diametrically opposite stator windings connected in parallel with the same direction, and one pair of poles is as follows.

When the rotor 1 (P) rotates, a permanent magnet located on it with one pair of S-N poles in the stator windings 4 (L1), 5 (L2), 6 (L3), 7 (L4) creates an alternating voltage (Fig. 4). Between the inputs of the rectifier bridge, an alternating and according to the oriented voltage is supplied, and on windings 4 (L1), 5 (L3) there will be a sine wave with a higher voltage value, and on windings 6 (L2), 7 (L4) there will be a cosine wave with a higher voltage value, thereby, a sinusoid and a cosine wave of alternating voltage will be simultaneously supplied to the rectifier bridge (Fig. 6). Moreover, at time t1, thyristors 12 (T1), 15 (T4) are open; at time t2, thyristor 15 (T4) is closed, and thyristors 12 (T1), 14 (T3), 17 (T6) are open; at time t3, thyristors 12 (T1), 17 (T6) are closed, and thyristors 13 (T2), 14 (T3) are open; at time t4, thyristor 14 (T3) is closed, and thyristors 13 (T2), 15 (T4), 16 (T5) are open; at time t5, as at time t1, thyristors 12 (T1), 15 (T4) are open, and thyristors 13-16 (T5) are closed; in subsequent periods of time there is a repetition of the operation of the rectifier bridge (Fig. 8). From the outputs of the rectifier bridge, the converted voltage is supplied to the input 18 of the load 19 (R) and to the output 20 of the load 19 (R) (Fig. 10). From FIG. 10 shows that the rectified voltage has a small ripple coefficient

Thus, the presented device is capable of creating a voltage with a small ripple due to the simultaneous generation of a sinusoid and cosine wave and the presence of a three-phase rectifier bridge operating in a given sequence, and increased current and voltage power and a small ripple coefficient are achieved due to the serial counter-current or parallel co-directional connection of the windings stator.

Claims (2)

An increased voltage direct current source with a low ripple coefficient, containing a rotor on which permanent magnets are used that act as poles, and a stator on which the windings are located, the rotor is made forcibly rotating an external source of mechanical energy to induce alternating voltage in the stator windings, the number of windings per the stator is even, characterized in that the stator windings are four times larger than the number of pole pairs on the rotor, and when connected in series and diametrically opposite stator windings, the end of the first winding is connected to the end of the third winding, the beginning of the first winding is connected to the first input of the rectifier bridge, the end of the second winding is connected to the end of the fourth winding, the beginning of the second winding is connected to the second input of the rectifier bridge, the beginning of the third and fourth windings are combined into node and connected to the third input of the rectifier bridge, with a parallel co-directional connection of diametrically opposite stator windings, the beginning of the first winding and the end of the third windings are combined and connected to the first input of the rectifier bridge, the beginning of the second winding and the end of the fourth winding are combined and connected to the second input of the rectifier bridge, the end of the first winding and the beginning of the third winding are combined and connected to the unit with the combined end of the second winding and the beginning of the fourth winding and are connected to the third input of the rectifier bridge, while the rectifier bridge is made three-phase. .

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