JP7415910B2 - Single-phase inverter output conductor fixing device - Google Patents

Description

The present invention relates to a single-phase inverter, and particularly to a method for fixing conductors and insulators.

In a single-phase inverter that outputs a high-frequency current, it is required to reduce the wiring impedance L (inductance) due to the conductor on the AC output side.

FIG. 1 shows a connection state between a single-phase inverter and a load, and the input side of the single-phase inverter 100 is connected to a positive pole P and a negative pole N of a DC power source (not shown).

The AC output side of the single-phase inverter 100 is connected to a load 200 via a reciprocating conductor 21 (first output conductor) that constitutes a U-phase conductor and a reciprocating conductor 22 (second output conductor) that constitutes a V-phase conductor. ing.

Lu and Lv indicate L (inductance) of the wiring impedance due to the reciprocating conductors 21 and 22.

In order to reduce Lu and Lv by L (inductance) of the wiring impedance, the reciprocating conductors 21 and 22 are stacked with an insulating plate (not shown) interposed therebetween, and the reciprocating conductors are wired close to each other.

However, if the distance between the reciprocating conductors is too close, the electric field strength between the reciprocating conductors will increase, so if the output is a high voltage, the distance between the reciprocating conductors above a certain level should be distance is required.

That is, the method of fixing the reciprocating conductors and interphase insulators that determine the distance between the reciprocating conductors is important, and Patent Document 1 has been proposed as a prior art of the fixing method.

JP2017-91902A

“Simple calculation method of busbar inductance and analysis of parasitic resonance of inverter DC link”, Electrical Engineering D Vol. 117, No. 11, pp 1364-1374 "Verification by measurement of an analytical model of wiring inductance of integrated circuits", Information Processing Society of Japan Research Report, SLDM-110, pp37-42, 2003-05-15

In Patent Document 1, a reciprocating conductor (first bus bar 12, second bus bar 14) and interphase insulator (insulating plate 17) are sandwiched and fixed between clamps 18 and 19. The reciprocating conductors (12, 14) and the interphase insulator (insulating plate 17) are in contact with each other, and the distance between the reciprocating conductors is equal to the thickness of the interphase insulator.

The technique described in Patent Document 1 has the following problems.
(1) The reciprocating conductors (12, 14) and the interphase insulator (17) are brought into contact, but since the dielectric constant of the insulator is generally higher than that of the air layer, the electric field strength between the reciprocating conductors tends to increase. In particular, corona discharge is likely to occur in the minute air layer that forms around the contact area.
(2) If the insulator is made thicker in order to reduce the electric field strength and suppress corona discharge, the distance between the reciprocating conductors increases and the wiring impedance increases.
(3) Since the reciprocating conductor and the interphase insulator are in close contact with each other, the insulation may deteriorate due to the heat generated by the reciprocating conductor.

The present invention solves the above-mentioned problems, and its purpose is to reduce the distance between first and second output conductors that are arranged facing each other at a predetermined distance with an interphase insulating plate in between, and the distance between the first output conductor and the first output conductor. By maintaining the distance between the interphase insulating plates and the distance between the second output conductor and the interphase insulating plate at a certain level or more, the electric field strength between the first and second output conductors is reduced and corona discharge is suppressed. An object of the present invention is to provide an output conductor fixing device for a single-phase inverter that can reduce wiring impedance L (inductance) by minimizing the distance.

A single-phase inverter output conductor fixing device according to claim 1 for solving the above problem,
an interphase insulating plate in the shape of a rectangular plane plate;
a first output conductor of a single-phase inverter disposed at a set distance in a vertical direction from one surface of the interphase insulating plate;
a second output conductor of a single-phase inverter disposed at a set distance in the vertical direction from the other surface of the interphase insulating plate;
an insulating plate holding part that pinches and holds the left and right ends of the interphase insulating board from one surface side and the other surface side, and a central part between the left end part and the right end part of the interphase insulating board; the second output at a central portion between a first fixed surface to which a surface opposite to the surface facing the interphase insulating plate of the first output conductor is fixed, and a left end and a right end of the interphase insulating board; an insulating holder having a surface of the conductor facing the interphase insulating plate and a second fixing surface to which the opposite surface is fixed;
A fixing member for fixing the first output conductor to a first fixing surface of the insulating holder and fixing the second output conductor to a second fixing surface of the insulating holder, respectively. .

The single-phase inverter output conductor fixing device according to claim 2 has the following features in claim 1:
The thickness D2 of the interphase insulating plate is set to a thickness where the dielectric strength of the interphase insulating plate exceeds the potential difference between the phases of the single-phase inverter,
The thickness D1 of the first air layer between one surface of the interphase insulating plate and the surface of the first output conductor facing the interphase insulating plate, the other surface of the interphase insulating plate, and the second The thickness D3 of the second air layer between the output conductor and the surface facing the interphase insulating plate is determined by the electric field strength E defined by equations (5), (6), and (7) of the air layer. It is characterized by being set to a value that is equal to or less than the dielectric strength.

(However, η: concentration coefficient, V: potential difference between phases of the single-phase inverter, D': equivalent insulation distance)

(However, ε1: relative permittivity of the first air layer, ε2: relative permittivity of the interphase insulating plate, ε3: relative permittivity of the second air layer, and the relative permittivity is the permittivity of each material. Divided by the dielectric constant (electrical constant) of vacuum, Ra is the curvature at the corner of the reciprocating conductor)
The single-phase inverter output conductor fixing device according to claim 3 has the following features in claim 1 or 2:
A first slope portion is formed between the left and right ends of the first fixed surface of the insulating holder and the insulating plate holding portion, and the left and right ends of the first output conductor are in point contact with the first slope portion. fixed,
A second slope part is formed between the left and right ends of the second fixed surface of the insulating holder and the insulating plate holding part, and the left and right ends of the second output conductor are in point contact with the second slope part. It is characterized by being fixed.

The output conductor fixing device for a single-phase inverter according to claim 4 is any one of claims 1 to 3, comprising:
The fixing member is
a first screw having one end fixed to the first output conductor and the other end protruding from the outer peripheral surface of the insulating holder through a through hole penetrated through the center of the first fixing surface of the insulating holder; , a first nut that is tightened from the other end side of the first screw;
A second screw having one end fixed to the second output conductor and the other end protruding from the outer peripheral surface of the insulating holder through a through hole penetrated through the center of the second fixing surface of the insulating holder. , a second nut that is tightened from the other end side of the second screw;
It is characterized by having the following.

The single-phase inverter output conductor fixing device according to claim 5 includes the following:
The fixing member is
a first spring having one end fixed to the first output conductor and the other end projecting from the outer peripheral surface of the insulating holder through a through hole penetrated through the center of the first fixing surface of the insulating holder; , a first mechanism portion that fixes the other end of the first spring to the insulating holder;
a second spring having one end fixed to the second output conductor and the other end projecting from the outer peripheral surface of the insulating holder through a through hole penetrated through the center of the second fixing surface of the insulating holder; , a second mechanical part that fixes the other end of the second spring to the insulating holder;
It is characterized by having the following.

The output conductor fixing device for a single-phase inverter according to claim 6 includes the following steps in any one of claims 1 to 5:
The present invention is characterized in that it includes a gap adjustment member that adjusts the gap H between the first fixing surface and the second fixing surface of the insulating holder and the pinching gap H' in the insulating plate holding part.

(1) According to the invention described in claims 1 to 6, the distance between the first output conductor and the second output conductor, and the (air layer) between the interphase insulating plate and the first output conductor. The distance (air layer) between the interphase insulating plate and the second output conductor can be maintained at a certain level or more, and the electric field strength between the first and second output conductors can be lowered to suppress corona discharge. By minimizing the distance between the first and second output conductors, the wiring impedance L (inductance) can be reduced, and deterioration of the insulator due to heat can be prevented.
(2) According to the invention set forth in claim 2, by setting the respective thicknesses D1, D2, and D3, the first output conductor and the second output conductor can be connected while ensuring necessary insulation and suppressing corona discharge. By minimizing the distance D0 (=D1+D2+D3) between the opposing surfaces of the output conductors, the wiring impedance L (inductance) can be reduced.
(3) According to the invention described in claim 3, the left and right ends of the first output conductor are fixed in point contact with the first slope part, and the left and right ends of the second output conductor are fixed to the first slope part. Since the first and second output conductors are fixed in point contact with the slope portion, the positioning accuracy in the left-right direction of the first and second output conductors is improved.
(4) According to the invention set forth in claim 4, the first and second output conductors can be fixed to the first fixing surface and the second fixing surface, respectively, with a simple configuration using screws and nuts.
(5) According to the invention set forth in claim 5, there is no need for screw tightening work, and the workability of assembly is improved.
(6) According to the invention as set forth in claim 6, each interval between the first output conductor, the interphase insulating plate, and the second output conductor is adjusted so that the distance corresponding to L (inductance) of the wiring impedance is controlled while suppressing corona discharge. It is possible to adjust the interval to a value that can be reduced.

FIG. 2 is a configuration diagram showing a connection state of a single-phase inverter with the outside. 1 is a sectional view of a main part of an output conductor fixing device according to a first embodiment of the present invention. 1 is a perspective view of an output conductor fixing device according to a first embodiment of the present invention. Embodiment 2 FIG. 2 is a sectional view of a main part of an output conductor fixing device according to a second embodiment of the present invention. FIG. 3 is a sectional view of a main part of an output conductor fixing device according to a third embodiment of the present invention. FIG. 3 is a characteristic diagram showing the relationship between the distance between output conductors of an inverter and inductance. An explanatory diagram showing a model of a rectangular geometric average distance.

Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to the following embodiments.

FIG. 2 shows a sectional view of a main part of the output conductor fixing device according to the first embodiment, and FIG. 3 shows a perspective view thereof. In these figures, 10 is an interphase insulating plate formed into a rectangular plane plate shape having a pair of short sides and a pair of long sides. A rectangular planar reciprocating conductor 21 (first output conductor) is arranged at a distance set in the vertical direction from one surface of the interphase insulating board 10, and is set in the vertical direction from the other surface of the interphase insulating board 10. A rectangular planar reciprocating conductor 22 (second output conductor) is arranged at a distance.

The reciprocating conductors 21 and 22 are, for example, the U-phase conductor (21) and V-phase conductor (22) of the single-phase inverter 100 connected to the load 200 as shown in FIG. The length of the short side is shorter than the short side of the interphase insulating plate 10, and the interphase insulating plate 10 is placed near the center of the short side of the interphase insulating plate 10. 10 and are arranged in parallel with each other.

31 and 32 are a first insulation holder and a second insulation holder for determining and holding the positions of the interphase insulating plate 10 and the reciprocating conductors 21 and 22, and are made of rectangular parallelepiped-shaped insulators, and are They are each arranged along the short side direction of the interphase insulating plate 10 near the center of the long side of the interphase insulating plate on the outer periphery side of the plate 10 and the reciprocating conductors 21 and 22 .

The first insulating holder 31 and the second insulating holder 32 are arranged opposite to each other via the interphase insulating plate 10 and the reciprocating conductors 21 and 22, and are located at both longitudinal ends of the first insulating holder 31. are formed with bonding surfaces 31a and 31b parallel to the direction in which the interphase insulating plates 10 are disposed, and bonding surfaces parallel to the direction in which the interphase insulating plates 10 are disposed are formed at both longitudinal ends of the third insulating holder 32. Surfaces 32a and 32b are formed, and the bonding surfaces 31a and 31b and the bonding surfaces 32a and 32b face each other and are bonded, respectively.

The left and right ends of the interphase insulating plates 10 are respectively inserted by cutting out a portion of the first insulating holder 31 from the inner ends of the joint surfaces 31a and 31b in the longitudinal direction to a position set a distance inward in the longitudinal direction. Recesses 31c and 31d for holding interphase insulating plates are formed.

The left and right ends of the interphase insulating plates 10 are inserted by cutting out a portion of the second insulating holder 32 from the inner end of the joint surfaces 32a, 32b in the longitudinal direction to a position set a distance inward in the longitudinal direction. Recesses 32c and 32d for holding interphase insulating plates are formed.

The recesses 31c, 31d, 32c, and 32d constitute an insulating plate holding part of the present invention.

The reciprocating conductor 21 is disposed by cutting out a portion of the first insulating holder 31 from the longitudinal inner end of the interphase insulating plate holding recess 31c to the longitudinal inner end of the interphase insulating plate holding recess 31d. A reciprocating conductor fixing recess 31e is formed.

The reciprocating conductor 22 is disposed by cutting out a portion of the second insulating holder 32 from the longitudinal inner end of the interphase insulating plate holding recess 32c to the longitudinal inner end of the interphase insulating plate holding recess 32d. A reciprocating conductor fixing recess 32e is formed.

A fixing surface (first fixing surface) 31f to which the reciprocating conductor 21 is fixed is formed at the bottom of the reciprocating conductor fixing recess 31e, and the first insulating holder 31 located at the center of the fixing surface 31f is penetrated. A through hole 31g is formed.

A fixing surface (second fixing surface) 32f to which the reciprocating conductor 22 is fixed is formed at the bottom of the reciprocating conductor fixing recess 32e, and the first insulating holder 32 located at the center of the fixing surface 32f is penetrated. A through hole 32g is formed.

A screw 41 is inserted into the through hole 31g, and one end of the screw 41 is fixed to the reciprocating conductor 21. The other end of the screw 41 is passed through a nut 51 (first nut), and by tightening the nut 51, the reciprocating conductor 21 is fixed to the fixing surface 31f of the first insulating holder 31.

A screw 42 is inserted into the through hole 32g, and one end of the screw 42 is fixed to the reciprocating conductor 22. The other end of the screw 42 is passed through a nut 52 (second nut), and by tightening the nut 52, the reciprocating conductor 22 is fixed to the fixing surface 32f of the second insulating holder 32.

At both ends in the longitudinal direction of the first and second insulating holders 31 and 32 provided with the joint surfaces 31a, 32a, 31b, and 32b, holes are made to penetrate in a direction perpendicular to the joint surfaces 31a, 32a, 31b, and 32b. Holes are provided, and by inserting screws 60a and 60b into the holes and tightening them with nuts 70a and 70b passed through the insertion tips of screws 60a and 60b, the interphase insulating plate 10 and reciprocating conductors 21 and 22 are separated. Positioning, fixing, and holding are performed.

The distance H between the fixing surface 31f of the first insulating holder 31 and the fixing surface 32f of the second insulating holder 32, and the holding distance H' by the interphase insulating plate holding recesses 31c, 31d, 32c, and 32d are as follows: Although determined by the dimensional design of the recesses 31c, 31d, 32c, and 32d, the distances H and H' can be adjusted by adjusting the degree of tightening of the nuts 70a and 70b.

Therefore, the screws 60a, 60b and the nuts 70a, 70b constitute the interval adjusting member of the present invention.

Dimension D1 in the figure is the thickness of the first air layer between one surface of the interphase insulating plate 10 and the surface of the reciprocating conductor 21 facing the interphase insulating plate 10, and dimension D2 is the thickness of the interphase insulating plate 10. Dimension D3 indicates the thickness of the second air layer between the other surface of the interphase insulating plate 10 and the surface of the reciprocating conductor 22 facing the interphase insulating plate 10. The dimension D0 is the distance between the reciprocating conductors 21 and 22, and is the sum of the dimensions D1, D2, and D3 (D0=D1+D2+D3).

In the device of the first embodiment configured as described above, from the viewpoint of reducing the L component of the wiring impedance, it is desirable to make the distance D0 between the reciprocating conductors 21 and 22 as small as possible. Therefore, as shown in FIG. 2, the reciprocating conductors 21 and 22 are stacked with the interphase insulating plate 10 in between, and the distance D0 between the conductors is made close to each other, thereby reducing the L component (Lu, Lv) of the wiring impedance.

At this time, the relationship between the distance D0 between the conductors and the inductances M, Lu, and Lv becomes the relationship shown in the characteristic diagram of FIG. 6.

In the characteristic diagram of FIG. 6, the left and right width of the reciprocating conductor 21 (22), that is, the length W of the short side, is 50 mm, the thickness t is 3 mm, the length l of the working side is 1000 mm, and the self-inductance L is 1000 nH. According to FIG. 6, it can be seen that by reducing the inter-conductor distance D0 as much as possible, the mutual inductance M increases, which cancels out the self-inductance L, thereby reducing the wiring impedance L (Lu, Lv).

The relational expressions among the wiring impedance L, the mutual inductance M, and the mutual geometric distance D can be expressed by the following equations (1) to (3) by referring to equation (17) in the known non-patent document 1. Ru.

(L: self inductance, M: mutual inductance)

However, logD on the left side of equation (3) means log(D/(1[m])), D0: distance between reciprocating conductors, t: thickness dimension of reciprocating conductor 21 (22), R _{D0 +2t} : Self-geometric average distance of a rectangle whose side length is W, (D0+2t), R _D0+t : Self-geometric average distance of a rectangle whose side length is W, (D0+t), R _D0 : Self-geometric average distance of a rectangle whose side lengths are W and D0, and the model of the geometric average distance of a rectangle is as shown in FIG.

Referring to the known non-patent document 2, the self-geometric average distance in a rectangle with side lengths W and D can be approximately determined by the following equation (4). The coefficient part of the equation (4) below varies depending on the ratio of W and D.

On the other hand, the dimension D0 needs to be larger than a certain value in order to insulate the reciprocating conductors and suppress corona discharge.

In the first embodiment, as a means for minimizing the distance D0 between the reciprocating conductors 21 and 22 and reducing the L component of the wiring impedance while satisfying the necessary insulation and suppressing corona discharge, the following procedure is used in the first embodiment. The dimensions H, H', D0, D1, D2, and D3 shown in FIG. 2 are determined, and a certain air layer (D1, D3) and an interphase insulating plate 10 (D2) are provided between the reciprocating conductors 21 and 22.

In order to minimize the distance D0 between the reciprocating conductors 21 and 22, each of the dimensions D1, D2, and D3 is set to the minimum.

The dimension D2 is a thickness such that the dielectric strength of the interphase insulating plate 10 exceeds the potential difference V [KV] between phases of the single-phase inverter. For example, when the potential difference between the phases is 30 [KV] and the material of the interphase insulating plate 10 is a glass epoxy laminate with a dielectric strength of 15 [KV/mm], the dimension D2 is set to be 2 [mm] or more.

Dimensions D1 and D3 are determined so that the electric field strength E defined by the following formulas (5), (6), and (7) is equal to the dielectric strength of the air layer: 3 [KV/mm] in order to suppress corona discharge. ] or less.

(However, η: concentration coefficient, V: potential difference between phases of the single-phase inverter, D': equivalent insulation distance)

(However, ε1: relative permittivity of the first air layer, ε2: relative permittivity of the interphase insulating plate, ε3: relative permittivity of the second air layer, and the relative permittivity is the permittivity of each material. Divided by the dielectric constant (electrical constant) of vacuum, Ra is the curvature at the corner of the reciprocating conductor)
In the configuration of Embodiment 1 shown in FIG. 2, the depth dimension H (that is, the first insulating By adjusting the distance H) between the fixing surface 31f of the holder 31 and the fixing surface 32f of the second insulating holder 32, arbitrary dimensions D0, D1, D2, and D3 can be obtained.

The dimension D0 is the size obtained by subtracting the conductor thickness (dimension t×2) of the reciprocating conductors 21 and 22 from the depth dimension H of the stepped groove portion. In order to clamp and position the interphase insulating plate 10, the clamping interval H' in the insulating plate clamping part, that is, the gap between the bottom surface of the interphase insulating plate clamping recess 31c (31d) and the bottom surface of the interphase insulating plate clamping recess 32c (32d). The dimension H' is equal to the dimension D2, which is the thickness of the interphase insulating plate 10. Alternatively, in order to prevent the interphase insulating plate 10 from being crushed, a clearance is provided with a dimension slightly larger than the dimension D2.

In general, the relative permittivity ε2 of the insulating plate is greater than the relative permittivity ε1, ε3 of the air layer, so the equivalent insulation distance per unit volume is greater than the prior art in which the reciprocating conductors are configured only with insulating plates as in Patent Document 1. D' (formula (6)) can be increased. As a result, the electric field strength E shown in equation (5) can be reduced, so the distance D0 between the reciprocating conductors 21 and 22 can be made even closer.

In addition, the air layers having dimensions D1 and D3 eliminate contact between the reciprocating conductors 21 and 22 and the interphase insulating plate 10, and the thermal influence of heat conduction on the interphase insulating plate 10 is reduced.

As described above, according to the first embodiment, since the reciprocating conductors 21 and 22 are close to each other and the distance D0 between the conductors is small, the inductance canceling effect due to mutual inductance is enhanced and the L component (Lu, Lv) of the wiring impedance is reduced. can be reduced.

In addition, by positioning the reciprocating conductors 21, 22 and the interphase insulating plate 10 with high precision and ensuring the thicknesses D1 and D3 of the air layer with a low dielectric constant, the distance D0 between the conductors can be minimized while the equivalent insulation distance D' ( Equation (6)) can be increased, and electric field strength E (Equation (5)) can be reduced to suppress corona discharge.

Further, the air layers having dimensions D1 and D3 eliminate contact between the reciprocating conductors 21 and 22 and the interphase insulating plate 10, and the thermal influence of heat conduction on the interphase insulating plate 10 can be reduced.

In the second embodiment, in order to improve the left and right positioning accuracy of the reciprocating conductors 21 and 22, slope portions (31h, 32h, 31i, 32i) were formed.

In FIG. 4, the same parts as in FIG. 2 are indicated by the same reference numerals. In FIG. 4, a slope portion 31h is formed by connecting the end of the interphase insulating plate holding recess 31c of the first insulating holder 31 closer to the center in the longitudinal direction and the end of the fixing surface 31f on the recess 31c side. A slope portion 31i is formed by connecting the end of the interphase insulating plate holding recess 31d near the center in the longitudinal direction and the end of the fixing surface 31f on the recess 31d side.

A slope portion 32h is formed by connecting the end of the second insulating holder 32 closer to the center in the longitudinal direction of the interphase insulating plate holding recess 32c and the end of the fixing surface 32f on the recess 32c side. A slope portion 32i is formed by connecting an end of the clamping recess 32d closer to the center in the longitudinal direction and an end of the fixing surface 32f on the recess 32d side.

According to the above configuration, by tightening the nut 51, the left and right ends of the reciprocating conductor 21 are fixed in point contact with the slope portions 31h and 31i, so that the accuracy of positioning the reciprocating conductor 21 in the left-right direction is further improved.

Similarly, by tightening the nut 52, the left and right ends of the reciprocating conductor 22 are fixed in point contact with the slope portions 32h and 32i, so that the accuracy of positioning the reciprocating conductor 22 in the left and right direction is further improved.

The other parts are configured in the same manner as in FIG. 2, and the same operations and effects as in FIG. 2 can be obtained.

In this third embodiment, in order to improve the workability of assembly, the screws 41, 42 and nuts 51, 52 in FIG. 2 are replaced with springs (81, 82) and mechanical mechanisms (91, 92) as shown in FIG. , ;mechanical section).

In FIG. 5, a spring 81 is inserted into the through hole 31g of the first insulating holder 31, and one end of the spring 81 is fixed to the reciprocating conductor 21. A spring 82 is inserted into the through hole 32g of the second insulating holder 32, and one end of the spring 82 is fixed to the reciprocating conductor 22.

Reference numeral 91 denotes a mechanical mechanism for fixing the other end of the spring 81 to the first insulating holder 31, which includes screws formed a predetermined distance from both ends in the longitudinal direction to the center on the outer periphery of the first insulating holder 31. Fixing pieces 91a, 91b, bending pieces 91c, 91d rising vertically from the central end of the screw fixing pieces 91a, 91b to the height of the other end of the spring 81, and a screw fixing piece 91a of the bending pieces 91c, 91d; 91b and a spring attachment piece 91e that connects the opposite ends to each other.

The screw fixing pieces 91a and 91b are fixed at the tips of the screws 60a and 60b by tightening the nuts 70a and 70b, and the center portion of the spring attachment piece 91e is fixed to the other end of the spring 81.

Reference numeral 92 denotes a mechanical mechanism for fixing the other end of the spring 82 to the second insulating holder 32, which includes screws formed a predetermined distance from both ends in the longitudinal direction to the center on the outer periphery of the second insulating holder 32. Fixing pieces 92a, 92b, bending pieces 92c, 92d rising vertically from the central end of the screw fixing pieces 92a, 92b to the height of the other end of the spring 82, and a screw fixing piece 92a of the bending pieces 92c, 92d; 92b and a spring attachment piece 92e that connects the opposite ends.

The screw fixing pieces 92a, 92b are fixed on the head sides of the screws 60a, 60b by tightening the nuts 70a, 70b, and the center portion of the spring attachment piece 92e is fixed to the other end of the spring 82.

These springs 81, 82 and mechanical mechanisms 91, 92 fix the reciprocating conductors 21, 22 to the fixed surfaces 31f, 32f, respectively.

According to the configuration shown in FIG. 5, there is no need to tighten screws as shown in FIGS. 2 to 4, and the workability of assembly is improved.

The other parts are configured in the same manner as in FIG. 2, and the same operations and effects as in FIG. 2 can be obtained.

Further, the third embodiment may be applied to the second embodiment in which a slope portion is formed. That is, instead of the fixing member consisting of screws 41, 42 and nuts 51, 52 in FIG. 4, springs 81, 82 and mechanical mechanisms 91, 92 in FIG. 5 are provided. In that case as well, the same actions and effects as in Example 2 can be obtained.

10... Interphase insulating plate 21, 22... Reciprocating conductor 31, 32... Insulation holder 31a, 31b, 32a, 32b... Joint surface 31c, 31d, 32c, 32d... Recessed part for holding interphase insulating plate 31e, 32e... For fixing reciprocating conductor Recesses 31f, 32f...Fixing surface 31g, 32g...Through hole 31h, 31i, 32h, 32i...Slope part 41, 42...Screw 51, 52, 70a, 70b...Nut 60a, 60b...Screw 81, 82...Spring 91, 92 ...Mechanical mechanism 91a, 91b, 92a, 92b...Screw fixing piece 91c, 91d, 92c, 92d...Bending piece 91e, 92e...Spring mounting piece 100...Single phase inverter 200...Load

Claims (6)

an interphase insulating plate in the shape of a rectangular plane plate;
a first output conductor of a single-phase inverter disposed at a set distance in a vertical direction from one surface of the interphase insulating plate;
a second output conductor of a single-phase inverter disposed at a set distance in the vertical direction from the other surface of the interphase insulating plate;
an insulating plate holding part that pinches and holds the left and right ends of the interphase insulating board from one surface side and the other surface side, and a central part between the left end part and the right end part of the interphase insulating board; the second output at a central portion between a first fixed surface to which a surface opposite to the surface facing the interphase insulating plate of the first output conductor is fixed, and a left end and a right end of the interphase insulating board; an insulating holder having a surface of the conductor facing the interphase insulating plate and a second fixing surface to which the opposite surface is fixed;
A fixing member for fixing the first output conductor to a first fixing surface of the insulating holder and fixing the second output conductor to a second fixing surface of the insulating holder, respectively. Single-phase inverter output conductor fixing device. The thickness D2 of the interphase insulating plate is set to a thickness where the dielectric strength of the interphase insulating plate exceeds the potential difference between the phases of the single-phase inverter,
The thickness D1 of the first air layer between one surface of the interphase insulating plate and the surface of the first output conductor facing the interphase insulating plate, the other surface of the interphase insulating plate, and the second The thickness D3 of the second air layer between the output conductor and the surface facing the interphase insulating plate is determined by the electric field strength E defined by equations (5), (6), and (7) of the air layer. The output conductor fixing device for a single-phase inverter according to claim 1, wherein the output conductor fixing device for a single-phase inverter is set to a value equal to or less than dielectric strength.

(However, η: concentration coefficient, V: potential difference between phases of the single-phase inverter, D': equivalent insulation distance)

(However, ε1: relative permittivity of the first air layer, ε2: relative permittivity of the interphase insulating plate, ε3: relative permittivity of the second air layer, and the relative permittivity is the permittivity of each material. Divided by the dielectric constant (electrical constant) of vacuum, Ra is the curvature at the corner of the reciprocating conductor) A first slope portion is formed between the left and right ends of the first fixed surface of the insulating holder and the insulating plate holding portion, and the left and right ends of the first output conductor are in point contact with the first slope portion. fixed,
A second slope part is formed between the left and right ends of the second fixed surface of the insulating holder and the insulating plate holding part, and the left and right ends of the second output conductor are in point contact with the second slope part. is fixed,
The output conductor fixing device for a single-phase inverter according to claim 1 or 2, characterized in that: The fixing member is
a first screw having one end fixed to the first output conductor and the other end protruding from the outer peripheral surface of the insulating holder through a through hole penetrated through the center of the first fixing surface of the insulating holder; , a first nut that is tightened from the other end side of the first screw;
A second screw having one end fixed to the second output conductor and the other end protruding from the outer peripheral surface of the insulating holder through a through hole penetrated through the center of the second fixing surface of the insulating holder. , a second nut that is tightened from the other end side of the second screw;
The output conductor fixing device for a single-phase inverter according to any one of claims 1 to 3, further comprising: The fixing member is
a first spring having one end fixed to the first output conductor and the other end projecting from the outer peripheral surface of the insulating holder through a through hole penetrated through the center of the first fixing surface of the insulating holder; , a first mechanism section that fixes the other end of the first spring to the insulating holder;
a second spring having one end fixed to the second output conductor and the other end projecting from the outer peripheral surface of the insulating holder through a through hole penetrated through the center of the second fixing surface of the insulating holder; , a second mechanism portion that fixes the other end of the second spring to the insulating holder;
The output conductor fixing device for a single-phase inverter according to any one of claims 1 to 3, further comprising: Claims 1 to 5, further comprising a gap adjusting member that adjusts a gap H between the first fixing surface and a second fixing surface of the insulating holder and a pinching gap H' in the insulating plate holding part. An output conductor fixing device for a single-phase inverter according to any one of the above.

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