JPS61185061A - Structure of electromagnetic joint - Google Patents

Abstract

PURPOSE:To facilitate maintenance and to shorten the longitudinal size by flowing a current to a field winding on the basis of a pole formed by flowing a current to the exciting winding of a rotor. CONSTITUTION:An armature winding 24 is provided on one rotor 13 of two rotors 11, 12 which rotates in an opposed manner, and a field winding 25 is provided at the other rotor 11. An exciting current is supplied to the winding 24 to form a pole. This pole is allowed to cross the winding 25 of the rotor 11 to induce an exciting voltage. Currents are flowed to field windings 51, 52, 57, 45, 46, 53 by the exciting voltage to form a field pole.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an electromagnetic joint. In particular, the invention relates to an electromagnetic joint in which one rotor is provided with an armature winding and the other rotor is provided with a field winding. Armature winding on one rotor of electromagnetic coupling. When a field winding is provided on the other rotor, for example, the patent application publication No. 14400/1983
As mentioned in the above, in order to supply DC excitation current to the field winding, it is necessary to provide a slip ring on the rotor where the field winding is installed. This is undesirable from the viewpoint of maintaining the electromagnetic joint as a rotating electric machine. For example, three slip rings must be provided on the rotor for the armature winding, and if there are two slip rings for the field winding on top of that, for example, The total number of slip rings is five, which is not favorable for maintenance. However, due to the arrangement of the slip rings, the dimension increases in the length direction.

In the present invention, when one side of the electromagnetic joint is provided with a rotor equipped with an armature winding, and the other rotor is equipped with a field winding,
At least without providing a slip ring for the field winding,
The purpose of the present invention is to improve maintenance so that it is easier to maintain than conventionally known electromagnetic joints, and the length dimension is shortened.

An electromagnetic joint in which armature windings and field windings are provided on one side and the other side of the rotor facing each other is disclosed in Patent Application Publication No. 1987-2, which is an improvement on the aforementioned Patent Application Publication No. 14400-1981.
There are also 9500. In this case, electromagnetic couplings 13 are used in an arrangement as shown in FIG.

That is, in FIG. 1, a prime mover 10 such as a diesel engine
One rotor 11 of the electrical coupling 13 is rotationally driven, and the load side drive shaft 31 of the other rotor 12 is driven by the gear device 15.
is arranged to drive a load 16 such as a propeller. The gear device 15 consists of a combination of a gear 27 and a gear 17,
Gear 27 is driven by electric motor 14 . The voltage induced in the armature winding provided on one rotor of the electromagnetic coupling 13 rotated by the output shaft 30 of the prime mover 10 is applied to the motor 14 through the slip rings 7, 8, 9, and the electromagnetic coupling 13 is provided to the motor 14. The mechanical output is also used to drive the load 16 through the output shaft 31. In the end, all of the input to the electromagnetic coupling 13 is used to drive the load 16, except for some loss. Therefore, the electromagnetic coupling 13 is used as a kind of speed reduction mechanism in this case. Although electromagnetic couplings are not necessarily used in this way, Figure 1 shows one way to use electromagnetic couplings. In the figure, arrow 35 indicates electromagnetic coupling 1.
3 shows the direction of power received from another power source at the time of starting No. 3.

FIG. 2 shows an example of an internal connection diagram of the electromagnetic coupling 13 shown in FIG. In order to achieve the above-mentioned object of the present invention, two rotors 11 and 12 rotating opposite each other are provided as shown in FIG. 1 of a specific arrangement example and FIG. 2 of a specific electrical connection diagram example. The armature winding 24 is attached to one rotor 12 in the
In the electromagnetic joint 13 in which the other rotor 11 is provided with a field winding 25, a certain terminal (■) of the armature winding 24,
Excitation winding part 1 provided on the rotor 12 from ■ and ■,
2, 3, 4, 5, and 6 to supply an excitation current, and the number of magnetic poles created by passing the excitation current through the windings and the load current flowing through the armature winding 24. The relationship between the number of magnetic poles created by one of them is 1 and the other is 2, and the winding 25 on the other rotor 11 cuts the magnetic pole created by the excitation current. As a result, an excitation voltage is induced therein, and the excitation voltage causes current to flow through the field windings 51, 52, 57, 45, 46, and 53, so that they are arranged to form field poles.

In the example shown in FIG. 2, the armature winding section 24 also serves as an excitation winding section. Outer terminals 47, 48, 49 of armature winding 24
are connected to the slip rings 7, 8, and 9 in FIG.
The load current will flow to 4. In other words, 24 acts as an armature winding for the load current flowing in the direction of the solid arrow from the windings 1, 2, 3, 4, 5, and 6 that constitute it, but the neutral points 18 and 19 For the excitation current flowing in the direction of the dotted arrow, it functions as an excitation winding. Armature winding terminals 47, 48 in Fig. 2
, 49 to the neutral point 18 through the transformer 21 and the rectifier 20.
, 19, and when the armature winding 24 functions as an excitation winding section, for example, four magnetic poles are created. On the other hand, a load current flows in the direction of the solid black arrow in the armature winding 24, creating two magnetic poles. Transformer 2
The primary winding 22 and secondary winding 23 of the transformer 21 are shown, and the transformer 21 normally lowers the voltage to bring the DC voltage of the rectifier 20 to a lower value. When an excitation current is passed through the armature winding 24 in the direction of the dotted arrow to create four magnetic poles in the rotor 12, in response to this, a voltage is applied to the winding 25 of the other rotor 11 in the direction of the dotted arrow. Induction and current flow. In that case, the magnetic poles created by the current flowing through the winding 25 in the direction of the dotted arrow will be four magnetic poles according to the above example. Outer terminals 32, 33 of winding 25,
34 to the AC side terminals of the rectifier 26, and the DC side terminals of the rectifier 26 are electrically connected to the neutral points 28 and 29 of the winding 25.
A direct current flows into the winding 25 in the direction of the solid arrow, creating a field pole. This field pole must be two poles according to the above example. In this way, the winding 25 of the rotor 11 also acts as an excitation winding for the current in the direction of the dotted arrow, and as a field winding for the current in the direction of the solid arrow. .

In FIG. 2, the armature winding 24 installed on the rotor 12
The windings of each phase connected in a double star pattern with respect to the neutral points 18 and 19 are connected to the neutral points 18 and 19 by windings in the opposite order for one phase.

Speaking of the windings of each phase in the order of winding, winding 1, winding 2, winding 3
The order is The winding connected in parallel with these is winding 4.
, winding 5, and winding 6 in this order. Actually, windings 1 and 2 are connected to the neutral point 18, but winding 6 is connected instead of winding 3. On the other hand, windings 4 and 5 are connected to the neutral point 19,
Connect winding 3 instead of winding 6. Connections similar to these connections are also made for the field winding 25 in the rotor 11 of FIG. These connections are to ensure that the field poles are made strong. In FIG. 2, the rotor 12 is also equipped for rotation with a transformer 21 and a rectifier 20. Further, the rotor 11 is equipped with a rectifier 26, and the rotor 11 is equipped with a rectifier 26.
rotates with. FIG. 3 is also an example of an electrical connection diagram showing the internal connections in the rotor 24 equipped with the armature winding 24. The armature windings 24 are connected in a double star shape around a neutral point 40, and each of the three-phase windings 37, 38, 39 is provided with external connection terminals 47, 48, 49, respectively. Intermediate terminals a1, a2, b1, b2, c1, c2 are provided as shown. These external connection terminals 47, 48
, 49 should be connected to the slip rings 7, 8, 9, but are not shown in FIG. At the same time, these external connection terminals 47, 48, and 49 are connected to the transformer 21.

The transformer 21 has a primary winding 22 and a secondary winding 23. This secondary side has six phases, and its terminals a1, b1,
It is assumed that c1, a2, b2, and c2 are connected to armature winding intermediate terminals having the same symbol. When connected in this way, two types of currents flow through each phase winding of the armature winding 24 at a certain instant, as shown in the diagram. That is, the current indicated by the solid line arrow is the electric current flowing out from the external connection terminals 47, 48, and 49, and the number of magnetic poles created by this is 2 poles in the above example, and the dotted line arrow The current at intermediate terminal a
1, a2, b1, b2, c1, and c2, and when viewed from the excitation current, the armature winding operates as an excitation winding. Following the example, the number of magnetic poles created by this exciting current is four.

FIG. 4 shows a case where the armature winding 24 and the excitation winding 44 are completely separated. The armature winding 24 has a star-shaped connection, and each phase winding 1, 2, 3 is connected around the neutral point 40.
The arrangement is such that an excitation current is supplied to the excitation winding 44 from intermediate terminals 41 , 42 , 43 of the excitation winding 44 via the rectifier 20 . When the load current flows from the armature winding 24 through the slip rings 7, 8, and 9, the number of magnetic poles created by the armature winding 24 due to the flow of this load current is 2 in the previous example. In the previous example, the number of magnetic poles created by the excitation winding 44 by the excitation current therein is four.

In general terms, the pole number ratio between the magnetic poles formed by the armature winding 24 and the magnetic poles formed by the excitation winding 44 is 1:2 or 2:1. The magnetic circuit interlinked with this armature winding and the magnetic circuit interlinked with the excitation winding are used together.

FIG. 5 shows each phase winding 1, 2, 34, 5 of the armature winding 24,
6 winding intermediate terminals 50, 55, 59, 54, 56, 58
is connected to the AC side terminal of the rectifier 20 as shown in the figure.

A DC voltage is applied between the neutral points 18 and 19 of the armature winding 24, and since a sufficiently large excitation current flows at a low voltage, the voltage applied to the AC side terminal of the rectifier 20 is a low value. That's fine. Therefore, it is possible to connect the intermediate terminals of each phase of the armature winding in this way.

FIG. 6 is an example showing the relationship between the armature winding 24 and the rectifier 20.
VW, and connect so that capacitors 60, 61, and 62 are passed from UVW to the AC side terminal of the rotary rectifier 20. The DC side voltage of the rectifier 20 is applied between the neutral points 18 and 19, but since that voltage is low, the voltage across the UVW of the high terminal voltage is applied to the capacitors 60, 61, 6.
2 and rectifier 20 in series, the appropriate voltage will be applied between neutral points 18 and 19.

FIG. 9 shows a concrete development example of the armature winding 24 of FIG. 6. Terminal U1 on the neutral point side of each phase winding,
There are U2, V1, V2, W1, W2, but the neutral point is 18,
As can be seen from the connection of the terminals to 19, U2, V1, and W2 are connected to the neutral point 18, and U1, V2, and W1 are connected to the neutral point 19. The reason why the connection order of only one phase winding is reversed in this way is to strengthen the strength of the magnetic field created by the direct current flowing from the neutral points 18 and 19. In Figure 6, black arrows and white arrows are shown, the former indicating the direction of the current corresponding to the load current coming out of the outer terminals U, V, W, and the latter indicating the direction of the current corresponding to the load current coming out of the outer terminals U, V, W. 20 shows the direction of current flowing from the neutral points 18 and 19 through the neutral points 18 and 19. The former is alternating current and indicates its instantaneous direction. Corresponding to this, the arrows in FIG. 9 are shown, and an example is shown in which a four-pole magnetic pole is created by the current shown by the black arrow, and a two-pole magnetic pole is created by the current shown by the white arrow.

FIG. 7 shows an example of the winding connection of the rotor 11 equipped with the field winding 64. A voltage is induced in the excitation winding 63, which acts as an excitation winding and has the same number of magnetic poles as the number of magnetic poles created by the current flowing through the armature winding 24, and the induced voltage drives the rectifier 26. Then, a current is passed through the field winding 64, and the number of magnetic poles created by the excitation winding 63 is 1/2.
Or create magnetic poles with twice the number of poles. It acts between this number of poles and the armature winding 24 that creates magnetic poles with the same number of poles. FIG. 7 shows how the rotor 11 is connected to the excitation winding 63 and the field winding 6.
The case where 4 are equipped separately is shown. The field winding 64 consists of a three-phase winding, in which direct current is supplied to two-phase windings 65 and 66, and a short-circuited current is supplied to the other one-phase winding 67 as shown in the figure. , to act as a brake winding.

FIG. 8 shows another example of the field winding. Number of grooves 20 is 2 than 1
It is indicated by a number up to 0, and a conductor is provided in a single layer in the groove. Each winding circuit 6 has become 4 circuits as shown in the figure.
8, 69, 70, 71 are rectifiers 72, 73, 74
, 75 and are short-circuited. Due to the electromotive force induced in the windings 68, 69, 70, 71 and the rectifiers 72, 73, 74, 75 in response to the magnetic poles created by the excitation current created in the rotor equipped with the armature winding 24, A current as shown by the arrow flows in the winding circuit. The magnetic poles thus produced have a number of poles that is 1/2 or twice as large as that represented by the voltage itself induced in the excitation winding. In the example shown in FIG. 8, the excitation winding has four poles and the field winding has two poles.

FIG. 10 shows a case where a brushless structure can be obtained as a whole of the device when such an electromagnetic coupling is used. A synchronous machine 93 is coupled to the rotors 11 and 12 of the electromagnetic joint, and an armature winding 90 of the synchronous machine 93 is provided to the rotor 88 of the synchronous machine 93, so that the armature winding of the synchronous machine The electrical connection wire 94
When connected with , it becomes a brushless structure. A stator 89 of a synchronous machine 93 is provided with its field winding 91, and its terminal 9
A DC excitation current is supplied through 2. At the time of starting, an exciting current is supplied to the field winding 91 of the synchronous machine 93, and a voltage is also established at the electromagnetic joint.

FIG. 11 shows that when a wound induction motor 76 is combined with the electromagnetic coupling, the electromagnetic coupling itself can have a brushless structure. In FIG. 11, the wound induction motor 76 is provided with a slip ring 75, but the electromagnetic joint does not need to be provided with a slip ring, and the structure of the electromagnetic joint is simplified.

An electrical connection wire 94 connects the electromagnetic joint and the armature windings of the wound induction motor 76. A slip ring 95 is connected to the secondary winding 78 of the wound induction motor 76 via an inverter 81, a reactor 80, and a converter 79. 83 and 84 are opening/closing devices. Wound induction motor 76
To rotate near the synchronous rotational speed, the opening/closing device 84 should be opened and the opening/closing device 83 should be closed. In that case, no current flows through the slip ring 95 and it is not used. In order to rotate the wound induction motor 76 at a synchronous rotational speed, a direct current may be passed through its secondary winding 78. In FIG. 11, the primary winding 77 is provided on the rotor and the secondary winding 78 is on the stator 87. The primary winding rotor is rotated in the opposite direction, that is, in the opposite direction to the direction of rotation of the prime mover 10. To open the opening/closing device 83 and close the opening/closing device 84,
It is convenient to give power from the slip ring 95 to the secondary winding 78 via the converter 79, the reactor 80, and the inverter 81. The inverter 81 can be used as a separately excited type,
Operate reliably. The inverter 81 is its rectifier 85
A control device 82 controls a control element 86 .

The effects of the present invention explained above can be summarized as follows.

(1) In the structure of an electromagnetic joint, if one rotor is provided with an armature winding and the other rotor is provided with a field winding, it is necessary to provide a slip ring and brushes on the rotor where the field winding is provided. It is structurally simple, easy to build, and easy to maintain.

(2) The lengthwise dimension of the electrical joint itself can be shortened.

[Brief explanation of drawings]

FIG. 1 is an example of a connection diagram of a device using the electromagnetic coupling of the present invention. FIG. 2 is a specific diagram showing an example of a connection diagram of the windings provided on the rotor of the electromagnetic coupling of the present invention. . FIG. 3 is an example of an electrical connection diagram related to the armature winding provided on one rotor of the electromagnetic joint of the present invention, and FIGS. 4 and 5 are also electrical connection diagrams related to the armature winding of the present invention. This is an example. FIG. 6 is an example diagram showing the connection between the armature winding and the rectifier of the present invention, while FIGS. 7 and 8 show the windings in the rotor provided with the field winding of the present invention. An example connection diagram is shown. FIG. 9 shows an example of a developed view of the armature winding shown in FIG. FIGS. 10 and 11 show examples of electrical connection diagrams in which the electromagnetic joint of the present invention is coupled to another rotating electric machine. Next, there are the following symbols that indicate the main parts of the drawings.

Claims (1)

[Claims] In an electromagnetic joint consisting of two rotors rotating oppositely, one rotor is provided with an armature winding, and the other rotor is provided with a field winding, in which a certain part of the armature winding is Electrical connection is made to supply excitation current from the terminal to the excitation winding section provided on the rotor, and the number of magnetic poles created by passing the excitation current through the winding section and the load on the armature winding are determined. The relationship between the number of magnetic poles created by passing an electric current is such that one of them is 1 and the other is 2, and the winding on the other rotor cuts the magnetic poles created by the excitation current. The structure of an electromagnetic joint is arranged in such a way that an excitation voltage is induced in it, and the excitation voltage causes a current to flow through the field winding, creating a field pole.