JPH0496684A - Dc linear motor - Google Patents

Abstract

PURPOSE:To suppress speed electromotive force to be induced in each phase coil of an armature coil by splitting a phase coil array of a plurality of phases, constituting an armature coil in a feeder section, into a plurality of independent phase units which divide that phase into electrically equal parts and constituting circuitry for feeding each phase unit with power independently. CONSTITUTION:A current type converter 17a is connected with one feeder 13a and each of a plurality of branch lines 18a connected with the feeder 13a is connected through a thyristor switch 19a with one phase coil array 12a of an armature coil 11 in each of branch sections juxtaposed in the longitudinal direction. In similar manner, the other current type converter 17b is connected with the other feeder 13b thence connected with the other phase coil array 12b of the armature coil 11 for each branch section. Consequently, one phase coil arrays 12a of a plurality of adjacent armature coils 11 are subjected to common power supply control by means of the current type converter 17a for the system (a) in every other feeder section, whereas the other phase coil arrays 12b are subjected to common power supply control by means of the current type converter 17b for the system (b).

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a DC linear motor, and more specifically, to an armature coil formed by bundling a plurality of phase coil arrays with mutually shifted phases. A plurality of coils are connected together to form a primary coil row, a plurality of feeding sections are set in this primary coil row, and a power converter for commutation control is provided for each feeding section. A commutation current whose direction of current is alternately reversed is passed from the power conversion device in the feeding section to each phase of the armature coil constituting the primary coil array, thereby interlinking with the primary coil array. This invention relates to an improvement of the power type in a DC linear motor that applies a traveling magnetic field to a secondary magnet device that generates magnetic flux.

[Prior Art] A typical configuration of this type of conventional DC linear motor powered type is shown in FIGS. 3(a) and 3(b).

Figures 3(a) and 3(b) are examples in which the secondary side is assumed to be the magnet device 2 mounted on the train 1, and Figure 3(a)
1 shows a schematic block configuration, and FIG. 2(b) shows a detailed circuit of the main part of one armature coil section.

As shown in Figure (a), on the ground side, a primary coil row consisting of a plurality of armature coils 31 connected in the length direction, each forming a feeder line branch section (to be described later), is arranged along the train running track. It is installed. Each armature coil 31 is shown in FIG.
), the phase coil arrays 32a, 32b of multiple phases (two phases in this case) are bundled with their phases shifted from each other, and each phase coil array 32a, 32b is formed by rectangular wave-wound coils. It has become.

In FIG. 3(a), a plurality of cutting sections are set in this primary coil row, and each feeding section consists of a pair of two-core coaxial cables, 33Aa, 33Ab.
and 33Ba, 33Bb, and each branch section consists of one armature coil 31 in this example.

A power conversion device 34 for commutation control is provided in each construction section, and in the illustrated example, this power conversion device 34 includes a transformer 35 that extracts power from the power transmission line 3, and a constant current forward/reverse converter 3 at the - mark.
6A, 35B, and a pair of current source converters 37A, 37B.

The constant current forward/reverse converters 36A and 36B convert the AC power from the transformer 35 into DC and convert the current source converter 37A
, 37B, and each current source converter 37A, 37
The thyristor inverter has the function of converting the regenerated DC power via B into AC and returning it from the transformer 35 to the power transmission line 3.

The current source converters 37A and 37B are composed of thyristor flip-flops interposed between the output end of the constant current forward/reverse converter and the feeder line, and are configured to convert the constant DC current from the constant current forward/reverse converter into The current is converted into a trapezoidal alternating current whose polarity is alternately reversed and supplied to each feeder line.

One current source converter 37A is connected to one pair of feeder wires 33Aa.
, 33Ab, and this feeder wire 33Aa, 33Bb
A plurality of branch wires 38Aa and 38Ab are connected to every other armature coil 31 in the length direction, that is, for each branch section, through a thyristor switch 39A.

Similarly, the other current source converter 37B is connected to the feeder line 3 of the other pair.
3B a, 33Bb, and a plurality of branch lines 3 connected to the pairs of feeder lines 33Ba, 33Bb.
8Ba and 38Bb are connected to every other armature coil 31, that is, for each branch section, through a thyristor switch 39B, so that in one armature section, a plurality of adjacent armature coils 31 are connected to one This is a branch section in which power supply is controlled by a current source converter 37A or 37B of the A system or B system every other time.

FIG. 3(b) shows the constant current forward/reverse converter 36A of the A system.
and current source converter 37A and its feeder wires 33Aa, 33
A closed circuit consisting of one armature coil 31 connected to a pair of Abs is shown. In this case, the branch line 38Aa
, 38Ab and the thyristor switch 39A are not shown for convenience of explanation.

In FIG. 3(b), the current source converter 37A includes four sets of thyristor flip-flops 371a, 372a, 371.
commutation capacitors 373a, 374a, 373b, 374b are connected to each flip-flop. One phase coil row 32a of the armature coil 31
is connected to flip-flops 371a and 372a, and the other phase coil array 32b is connected to flip-flops 371b and 372a.
72b, and thereby each flip-flop of the current source converter 37A forms a series connection circuit between the DC output terminals of the constant current forward/inverter 35A via each phase coil array 32a32b.

The traveling position of the train 1 is detected by the cross-induction radio system 4 provided along the primary coil row, and the train 1 advances by λ/4 in the direction of the arrow X with respect to the coil pitch λ of the phase coil rows 32a and 32b. Cross guidance radio system 4
A trigger circuit 375 in the current source converter 37A provides a trigger signal to each flip-flop in response to a train position signal from the train position signal, thereby reversing the direction of the current flowing through each phase coil array 32a, 32b.

The train 1 is equipped with a magnet device 2 that alternates in the direction of 6n bundles in the train width direction or in opposite directions along the train length direction at a pitch of λ/2.
In Fig. 3(b), the phase coil row 32a is installed.
, 32b are assumed to be placed vertically or parallel to the paper surface, the magnet denoted by N handles the magnetic flux from the back side of the paper to the front side, and the magnet denoted by S handles the magnetic flux from the front side of the paper to the back side of the paper. It is assumed that it interlinks with the vertical side of the phase coil.

In the state shown in Figure 3(b), assuming that current is flowing in each phase coil in the direction of the arrow shown, the magnetic flux from the magnet N interlinks with the vertical side through which the upward current is flowing, and The magnet S interlinks with the vertical side through which the downward current flows,
A driving force in the direction of arrow X acts on the train 1 due to these interlinking magnetic fluxes. When the train advances 1 or λ/4, the current source converter 3
Each of the 7A flip-flops is inverted at the same time, and the direction of the current is reversed. At this time, the magnet N approaches the next vertical side where the downward current was flowing, but the direction of the current on that vertical side is reversed and becomes an upward current, and similarly, the magnet S approaches the next vertical side where the downward current was flowing. However, the direction of the current on that vertical side is reversed and becomes a downward current, so the magnet 2 is eventually moved in the same X direction by the magnetic flux interlinking with the next vertical side of the phase coil arrays 32a and 32b. In this way, by passing a commutating current that alternately reverses the direction of the current through each phase coil array 32a, 32b of the armature coil 31, the direction of the current is alternately reversed with the primary coil array. By applying the same traveling magnetic field to the secondary side magnet device 2 which generates magnetic flux interlinking in opposite directions, the train 1 can be made to travel at a speed determined by the commutation speed.

When the magnet device 2 at the tip of the train 1 enters the armature coil (branch section) connected to the feeder line of the adjacent B system, the cyrisk switch 3 connected to this armature coil is activated.
9B is made conductive.

In the same way, the thyristor switches of the armature coils (branch section) ahead are made conductive one after another, and the armature coil (branch section) that the magnet device 2 at the rear end of the train 1 has passed
When the si-risk switch is placed in the cut-off state, the traveling magnetic field continues across one feeder line section, and the field continues to propagate to the adjacent feeder line section.

[Problem to be solved by the invention] In the conventional DC linear motor described above, the length of the feeder line branch section of the armature coil 31 constituting the primary coil row is set to be longer than the total length of the magnet device 2 of the train 1. It is set to be long, and power is fed while switching the power for each branch section of such length. In this case, each phase coil row 32a, 32b constituting the armature coil of each branch section is connected to the feeder line 33Aa, 33Ab of the A system, or the feeder line 33Ab of the B system via another thyristor switch 39A or 39B for each adjacent branch section. The feeder lines 33Aa and 33Ab of the A system are connected to the constant current forward/reverse converter 36A and the current source converter 37A, and the feeder lines 33Ba and 33Bb of the B system are connected to the constant current forward/reverse converter 36B. The A system and the B system are configured as separate power supply systems, respectively.

In such a conventional power supply system, if the load capacity of train 1 becomes large, the speed electromotive force generated in the armature coil will exceed the withstand voltage of the phase coil array. It is necessary to suppress the speed electromotive force by making the length shorter than the train length, and for this purpose, the power supply system should be changed from two systems A and B to three systems A, B, and C or more. It had to be a ceremony.

However, when using a multi-system power system, not only does the number of feeder lines increase, but the installed capacity of the power supply also increases, and the number of feeder branch sections increases, so the number of si-risk switches for each branch section also increases. As a result, an increase in equipment costs is unavoidable.

In addition, this type of DC linear motor uses a constant current forward/reverse converter and a current source converter in the power converter of the power supply to convert a constant DC current into a multi-phase linear wave alternating current, which is then transferred to the armature. Since a method is adopted in which current is passed through each phase coil array of the coil and commutated, a thyristor flip-flop of the current source converter is provided for each phase of the armature coil, or in a conventional power supply circuit, as shown in Figure 3. (b) As shown in FIG.
These constant current forward/reverse converters and current source converters are connected in series between the 6A DC output ends, and therefore have the disadvantage that the withstand voltage design of these constant current forward/reverse converters and current source converters must also be high voltage.

This invention was made to solve the problems of the conventional method described above, and it is possible to reduce the speed electromotive force generated in the phase coil array of the armature coil, thereby reducing the phase-to-phase withstand voltage of the armature coil. reduction, expansion of feeder line branch divisions,
This has been improved to reduce the number of feeder lines and reduce the capacity of power supply equipment! The purpose of this invention is to provide an 8-electric DC linear motor.

A plurality of armature coils bundled with mutually shifted phases are connected to form a primary coil row, and a plurality of feeding sections are set in this primary coil row, and power for commutation control is generated for each feeding section. A converter is provided, and a commutation current is supplied to each phase of the armature coil constituting the primary coil row in one feeding section from the power converter in the feeder section so that the direction of the current is alternately reversed. A DC linear motor in which a traveling magnetic field is applied to a secondary magnet device that generates magnetic flux that alternately interlinks in opposite directions with respect to the primary coil array in the same way as in the conventional example described above. In order to solve the above-mentioned problem, the multi-phase phase coil array constituting the armature coil in the drilling section is electrically divided into a plurality of independent phase units that equally divide the number of phases, Furthermore, the power converter is equipped with a circuit configuration that supplies power independently for each phase.

[Means for Solving the Problems] In the present invention, a plurality of phase coil arrays are connected to a plurality of phase coil arrays. Since the column is electrically divided into a plurality of independent phase units that equally divide the number of phases, and the power conversion device has a circuit configuration that supplies power independently for each phase unit, for example, When the armature coil is divided into two phase coil array units, the speed electromotive force generated in each phase is 1/2 of that when it is not divided. Therefore, not only the inter-phase withstand voltage of the armature coil is reduced, but also the same train load In terms of capacity, it is possible to double the feeder branch section, for example.

In addition, since the power converter has a circuit system that supplies power independently for each phase, it is possible to supply power to adjacent feeder line branch sections from a common feeder line for each phase. Since a coaxial cable is sufficient, the number of feeder lines can be reduced.

Furthermore, since the power supply circuit is configured for each phase, it is possible to perform a rational design for the power supply circuit for each phase that matches the withstand voltage of the phase coil array. You will be able to configure.

[Embodiment] An embodiment of the present invention is shown in FIGS. 1(a) and 1(b). In this embodiment, a case is shown in which the primary side coil array is constituted by an armature coil consisting of a two-phase coil array, in order to make it clear that this is a comparison with the conventional example shown in FIG.

That is, FIGS. 1(a) and 1(b) show a magnetic device 2 mounted on the train 1 on the secondary side (la pole array in which the direction of the magnetic flux in the width direction is alternately reversed over the length direction of the train). This is an example in which the block diagram shown in FIG. 2A is schematically shown, and the detailed circuit of the main part of one armature coil section is shown in FIG.

In the same figure (al), on the ground side, there is a primary coil row formed by connecting a plurality of armature coils 11 in the length direction, each forming the above-mentioned feeder line branch section, or along the train running track.
It is installed. Each armature coil 11 is connected to a phase coil array 12 of multiple phases (two phases in this case) as shown in FIG.
It is made by bundling a and 12b with mutually shifted phases,
Each phase coil array 12a, +2b consists of a rectangular wave-wound coil.

% 1 In Figure (a), a plurality of feeding sections are set in this primary coil row, and each feeding section is connected to each phase by feeding wires 13a and 13b consisting of a pair of two-core coaxial cables. A plurality of commonly fed feeder branch sections are included, each branch section consisting of one armature coil 11 in this example.

Each feeding section is provided with a power conversion device 14 for commutation control, and in the illustrated example, this power conversion device 14 includes a transformer 15 that extracts power from the power transmission line 3, and a pair of constant current forward/reverse converters 1.
6a, 16b, and a pair of current source converters 17a, 17b.

The constant current forward/reverse converters 16a and 16b are composed of two independent systems of thyristor inverters, each of which is connected to a transformer 15.
Each current source converter 1 converts the AC power from
7a, 17b, and each current source converter 17a'
, 17b, it has a function of converting the DC power regenerated into AC power and returning it from the transformer 15 to the power transmission line 3.

The current source converters 17a, 17b also connect the respective output ends of the constant current forward/reverse converters +6a, 16b and the respective feeder wires 13a.
, 13b, each of which converts a constant DC current from the constant current forward/inverter into a trapezoidal alternating current whose polarity is alternately reversed. supply to each feeder line.

One current source converter 17a is connected to one feeder line 13a, and a plurality of branch lines 18a are connected to this feeder line 13a.
are connected to one phase coil row 12a of the armature coils 11 in each longitudinally adjacent branch section via a silisk switch 198, respectively.

Similarly, the other current source converter 17b is connected to the other feeder line 13b.
A plurality of branch lines 18b connected to this feeder line 13b are connected to the other phase coil array 12b of the armature coil 11 for each branch section via a thyristor switch 19b.
It is connected to the.

Therefore, in one feeding section, power supply is commonly controlled by the current source converter 17a of one phase coil group +2ah<a system of one phase coil group 11 of adjacent armature coils 11, and the current source converter 17a of the other phase coil group 12b or b system Current source converter 17b
The power supply is commonly controlled by

FIG. 1(b) shows one in which phase coil arrays +2a, +2b are individually connected to the constant current forward/reverse converters 16a, 16b, current source converter 17a7b, and their feeder lines 13a, 13b of both systems a and b. This figure shows a two-system closed circuit consisting of armature coils 11. In this case, the branch line 18a,
1. '8b and the thyristor switches 19a and 19b are not shown for convenience of explanation.

In FIG. 1(b), the current source converter 17a of system A includes two sets of thyristor flip-flops 171a and 172a.
, and each flip-flop has a commutating capacitor 173.
a, 174a are connected. Similarly, the current source converter 17b of the b system also includes two sets of thyristor flip-flops 17.
1b and 172b, and commutating capacitors +73b and 1.74b are connected to each flip-flop.

One phase coil row 12a of the armature coil 11 is the feeder wire 1
3a to flip-flops 171a and 1728, and the other phase coil array 12b is connected to flip-flops 171b and 172b by wire 13b.

The flip-flops of the current source converters 17a and 17b are each independently connected to the DC output terminal of the constant current forward/reverse converter 16a16b, thereby forming two independent power supply circuits for each phase.

The traveling position of the train 1 is detected by the cross-induction radio system 4 provided along the primary coil row, and the train 1 advances by λ/4 in the direction of arrow X with respect to the coil pitch λ of the phase coil rows 12a and 12b. Every time crossed 8 conductor wireless system 4
Based on the train position signal from the current source converters 17a, 17
A trigger circuit 175 in b provides a trigger signal to each flip-flop, thereby reversing the direction of the current flowing through each phase coil array 12a, 12b.

The train 1 is equipped with a magnet device 2 in which the direction of the magnetic flux is alternately reversed along the train width direction or the train length direction at a pitch of λ/2. Column 12a,
Assuming that the coil 12b is placed vertically or parallel to the paper surface, the magnet represented by N handles the magnetic flux from the back side of the paper to the front surface, and the magnet represented by S handles the magnetic flux from the front side to the back side of the paper for each phase. Assume that it interlinks with the vertical side of the coil.

In the state shown in FIG. 1(b), if current is flowing in each phase coil in the direction of the arrow shown, the magnetic flux from magnet N will interlink with the vertical side through which the upward current is flowing, and The magnet S interlinks with the vertical side through which the downward current flows,
A driving force in the direction of arrow X acts on the train 1 due to these interlinking magnetic fluxes. When train 1 advances by λ/4, current source converter 1
The flip-flops 7a and +7b are inverted all at once, and the direction of the current is reversed. At this time, the magnet N reaches the next vertical side where the downward current was flowing, or the direction of the current on that vertical side is reversed and becomes an upward current.Similarly, the magnet S reaches the next vertical side where the downward current was flowing. When the current reaches a vertical side, the direction of the current on that vertical side is reversed and becomes a downward current, so that the magnet 2 is eventually moved in the same X direction by the magnetic flux interlinking with these next vertical sides of the phase coil arrays 12a and I2b. In this way, the armature coil 11
A secondary magnet device 2 generates a magnetic flux that alternately interlinks with the secondary coil array in the opposite direction by flowing a commutated current whose direction of current is alternately reversed through each phase coil array 12a, 12b. The train 1 can be run at a speed determined by the commutation speed.

In Figure 1(b), due to the power supply circuit configuration divided into two systems, the speed electromotive force generated in the phase coil array for each phase of the armature coil is as shown in Figure 3(b). The ratio becomes 1/2.

Now, the configurations shown in FIGS. 1(a) and 1(b) are suitable for application to a constant speed section in which the train 1 travels at a constant speed. That is, in this case, since the armature coil 11 has two phases, the power supply is made independent for each phase, and the feeder wires 13a of two-core coaxial cables are connected to the two power supply systems.

Phase a and b are fed through wires 3b and thyristor switches +9a and 19b are used to conduct and commutate phase by phase through feeder branch wires +8a and 18b for each feeder branch section. .

By adopting such a free electric power system, when the magnet device 2 at the tip of the train 1 enters the adjacent front armature coil (branch section), it is the same as during steady running in the previous branch section. At the switching timing, immediately before the approach, commutation is carried out by switching the energization of one phase coil row 12a (or 12b) of the armature coil to the phase coil row 12a (or 12b) of the forward branch section by the trigger circuit 175. You can take over. In this case, the train 1 passes through the connection between the branch sections without receiving 1/2 of the driving force, and when the magnet device 2 at the rear end of the train 1 passes this connection, the electric motor in the rear branch section The energization of the phase coil array 12b (or 12a) of the child coil is switched to the phase coil array 12b (or 12a) of the train section (the above-mentioned forward branch section), thereby making the driving force of the train section the full driving force.

It goes without saying that this driving force can be generated either positive or negative (forward or backward movement of the train) depending on the commutation phase.

FIG. 2 shows another embodiment suitable for acceleration/deceleration sections or slope sections that require a relatively large driving force. That is, in the second section, a according to the present invention shown in FIG.
, B2 phase unit power equation is combined with the feeding power equation for each feeder line branch section of A and B2 systems shown in Figure 3 (a), and current switching between adjacent branch sections is performed. can be performed for each phase. In this case, every other connected armature coil 11 is divided into an A system and a B system, and each system employs the same per-phase feeding power formula as shown in FIGS. 1(a) and 1(b).

In FIG. 2, the power converter 14A of the A system and the power converter 14B of the B system are respectively shown in FIGS.
It has a circuit configuration similar to that shown in . That is, the A-system power converter 14A includes a transformer 15A, a pair of mutually independent constant current forward/reverse converters 16Aa and 16Ab,
It includes a pair of independent current saturation converters 17Aa and +7Ab, and their a-phase and b-phase outputs are branched from a pair of feeder lines 13Aa and 13Ab each consisting of a two-core coaxial cable to feeder branch lines 18Aa and 18Ab. Thyristor switch 1
Every other armature coil 1 via 9Aa and 19Ab
Power is supplied to each phase coil array of 1 independently. Similarly, the power converter $14B of system B also has transformer 1.
5B, and a pair of mutually independent constant current forward/reverse converters 16B.
a, 16Bb and a pair of independent current source converters 17Ba
, 17Bb, whose a-phase and b-phase outputs are each 2
A pair of feeder wires 13Ba13Bb consisting of a core coaxial cable
The power is branched off by each feeding branch line 18Ba, 18Bb, and power is independently supplied to each phase coil row of another armature coil 11 every other armature coil 11 via thyristor switches 19Ba, 19Bb. Needless to say, in this case, the trigger control of each flip-flop of the current source converter and the switching control of the thyristor switches are performed for each A or B system. Furthermore, commutation control when a train is located within each branch section is performed by phase-by-phase commutation control within each system, and current switching between branch sections is performed by current switching between system A and system 8. . This makes it possible to continue commutation while keeping the full driving force when a train passes between branch sections.

[Effects of the Invention] As described above, in the DC linear motor of the present invention, the multiple phase coil arrays constituting the armature coil, which is an element of the primary coil array in the feeding section, are electrically connected to each other. It is divided into multiple independent phase units that divide the number of phases equally, and the power converter that supplies power to it has a circuit configuration that supplies power independently for each phase unit, so for example, if the armature coil is divided into two When the phases are divided into phase coil rows, the speed electromotive force generated in each phase is 1/2 of that when not divided, so it is possible to reduce the phase withstand voltage of the armature coil and expand the branching section of the feeder wire. It is.

In addition, since the power converter has a circuit system that supplies power independently for each phase, it is possible to supply power to adjacent feeder line branch sections from a common feeder line for each phase. Since a coaxial cable is sufficient, it is possible to reduce the number of feeder lines.

Furthermore, since the power supply circuit is configured for each phase, it is possible to perform a rational design for the power supply circuit for each phase that matches the withstand voltage of the phase coil array. can be configured.

[Brief explanation of drawings]

FIG. 1(a) is a block circuit diagram showing a schematic configuration of an embodiment of the present invention, FIG. 1(b) is a circuit diagram showing details of main parts of one armature coil section, and FIG. The diagram is
FIGS. 3(a) and 3(b) are block circuit diagrams showing a schematic configuration of another embodiment of the present invention, and FIGS. 3(a) and 3(b) are a block circuit diagram of a schematic configuration and a detailed circuit diagram of main parts of a conventional example. (Explanation of symbols of main parts) 1: Train 2, magnet device 3 Power transmission line 11 Armature coils 12a, 12b: Phase coil arrays 13a, 13b: Feeding line 14 Power converter 15 Transformer 16a, 16b Constant current forward/reverse converter +7a, 17b: Current source converter 18, a, 18b: Feeding branch line

Claims (1)

[Claims] A plurality of armature coils made by bundling phase coil arrays of multiple phases with mutually shifted phases are connected to form a primary coil array, and multiple feeding sections are set in this primary coil array, and each feeding section is A power conversion device for commutation control is provided in the feeder section, and the direction of current is alternated from the power converter in the feeding section to each phase of the armature coil constituting the primary coil row in one feeding section. A DC linear motor configured to apply a traveling magnetic field to a secondary magnet device that generates magnetic flux that alternately interlinks in opposite directions with respect to the primary coil array by flowing a commutating current that reverses in direction. In this method, a plurality of phase coil arrays constituting the armature coil in the feeder section are electrically divided into a plurality of independent phase units that equally divide the number of phases, and the power converter is configured to control the power converter for each phase unit. A DC linear motor characterized by having a circuit configuration that supplies power independently.