WO2010067679A1

WO2010067679A1 - Protocol for voltage surge suppression and recovering from energy surge

Info

Publication number: WO2010067679A1
Application number: PCT/JP2009/069085
Authority: WO
Inventors: 政宣中村; 清水　敏久
Original assignee: 沖電線株式会社; 公立大学法人首都大学東京
Priority date: 2008-12-08
Filing date: 2009-11-10
Publication date: 2010-06-17
Also published as: JP2010136564A; JP5530094B2

Abstract

Conventionally, countermeasures have been taken to alleviate voltage surges with a motor that is driven by an inverter, wherein a filter is inserted so as to minimize an excessive voltage surge that is caused by a switching operation of a switching element within the inverter and occurs upon the power supply terminal of the motor. A problem, however, is that, particularly with applications that generate large drive currents, the volume of the inductor increases, and power loss, which occurs in the inductor or the resistor that configure the filter circuit, grows in the extreme, leading to an increase in the size of the overall device and an increase in the amount of power loss. Disclosed is a protocol for suppressing voltage surges and recovering from energy surges without loss of power, a configuration of a representative embodiment whereof has a main line, between the inverter and the motor, branching from each respective terminal thereof and connecting to an auxiliary line at each branch thereof, an alternating current terminal of a rectifier connected to the auxiliary electric line, a capacitor further connected upon both ends of a direct current terminal of the rectifier, and finally, the direct current terminal thereof being connected to a direct current terminal of the inverter.

Description

Surge energy regenerative surge voltage suppression method

In the motor driven by the inverter device, the present invention has an excessive surge (unnecessary high voltage waveform due to mismatched reflection) voltage (hereinafter, referred to as “non-matched reflection”) generated in the power supply terminal of the motor due to the switching operation of the switching element in the inverter device. The present invention relates to a surge energy regenerative type surge voltage suppression system that can effectively reduce a surge energy loss and suppress surge noise and regenerate surge energy.

First, an example of a conventional method for suppressing a motor surge voltage is shown in FIG. In general, when an inverter and a motor driven by the inverter are connected by a relatively long wire, a transient excessive surge voltage is generated in the motor terminal voltage every time the inverter switch is switched. The insulation of the wire deteriorated over time, and in the worst case, there was a problem that the motor was damaged by dielectric breakdown. As a measure for preventing this, an inductor 20 ′ is inserted in series between the AC output terminal of the inverter and the input terminal of the motor, and a kind of series circuit composed of a capacitor 8 ′ and a resistor 10 ′ is inserted between the motor side wires. A measure has been taken to mitigate the surge voltage generated at the input terminal of the motor by inserting a filter 9 'to mitigate transient voltage fluctuations occurring at the inverter output terminal (see, for example, Non-Patent Document 1). ). Further, as shown in FIG. 13 (1), the conventional example of the present invention conventionally uses electric wires 31 ', 32', 33 'on the main line between the motor 3' and the inverter device 2 '. (For example, refer to Patent Document 1).

JP 2003-219655 A

In the above-mentioned measure, since it is necessary to insert the inductor 20 'in series with the wiring connecting the inverter device 2' and the motor 3 ', it is necessary to use the inductor 20' having a current capacity capable of passing the driving current of the motor. There is. Therefore, particularly in applications where a large drive current flows, the volume of the inductor 20 'increases, and furthermore, the power loss generated in the inductor 20' and the resistor 10 'constituting the filter 9' increases extremely. This led to an increase in size and loss. Further, in FIG. 13, since a high voltage and a high current for driving the motor pass through the filter 9 ′, each component constituting the filter 9 ′ requires a high power component, so that it is inevitably expensive. There was also. The present invention has been made in view of such circumstances, and its purpose is to minimize power loss associated with suppression of surge voltage generated at the input terminal of the motor, and to reduce the magnitude of the drive current of the motor and the inverter and motor. The present invention provides a method that can always suppress the surge voltage without depending on the length of the wiring to be connected.

The surge voltage suppression method of the present invention is configured as follows to achieve the above object. As a representative example, the configuration of the first embodiment of the present invention is such that the

subordinate line wires

41, 42, 43 are branched from the terminals of the

main line wires

31, 32, 33 between the inverter device 2 and the motor 3. Next, the

AC terminals

51, 52, 53 of the rectifier 4 are connected to the

electric wires

41, 42, 43 of the slave line, and the capacitor 8 is connected to both ends of the

DC terminals

54, 55 of the rectifier 4. Finally, the

DC terminals

54 and 55 are a lossless surge energy regenerative surge voltage suppression system connected to the

DC terminals

14 and 15 of the inverter device 2.

In the conventional surge suppression method, surge energy is lost due to a method of efficiently flowing surge noise to the ground or changing to heat. According to the surge energy regeneration type surge voltage suppression method of the present invention, surge energy can be regenerated by reducing surge energy loss as much as possible and efficiently returning the surge noise voltage to the inverter input. As a result, power loss becomes lossless, which not only enables significant downsizing and cost reduction, but also enables a wide range of applications for other noise countermeasures. It has a great effect.

FIG. 1A shows Examples 1, 2, and 3 of the present invention, and FIG. 1B shows Example 4 of the present invention. 2A shows a fifth embodiment of the present invention, FIG. 2B shows a sixth embodiment of the present invention, and FIG. 2C shows a seventh embodiment of the present invention. FIG. 3A shows an eighth embodiment of the present invention, and FIG. 3B shows an ninth embodiment of the present invention. 4A shows a tenth embodiment of the present invention, and FIG. 4B shows an eleventh embodiment of the present invention. FIG. 5A shows Example 13 of the present invention, and FIG. 5B shows Example 14 of the present invention. 6A shows a fifteenth embodiment of the present invention, and FIG. 6B shows a sixteenth embodiment of the present invention. FIG. 7 is an explanatory diagram of the operation principle in the case of the ideal step voltage of the present invention. FIG. 8 is an explanatory diagram of the operation principle when the rise time is not used instead of the ideal step voltage of the present invention. FIGS. 9 (1) and 9 (2) are explanatory diagrams of the operating principle of the first policy (Examples 4, 5, and 6) of the present invention. FIGS. 10 (1) and (2) are diagrams for explaining the operating principle of the second policy (Example 7) of the present invention. FIG. 11 (A) is an example of a conventional cable without a filter, and FIG. 11 (B) is an example 12 of the present invention implemented with a multi-core cable 7A generally used. FIG. 12 shows an embodiment 13 of the present invention using the surge suppression wire 7B. FIG. 13 is a diagram for explaining the operation principle of the conventional system.

Hereinafter, embodiments of the surge energy regenerative surge voltage suppression method of the present invention will be described in detail with reference to the accompanying drawings.

First, the principle of generation of surge voltage generated in a conventional motor terminal will be described based on the distributed constant line theory. FIG. 13A is a diagram in which the output terminal of the conventional inverter device 2 ′ and the motor terminal are connected by a three-phase cable. A three-phase inverter includes three pairs of switches connected in series, and each is referred to as a U-phase, V-phase, and W-phase switch. In general, a single phase switch is switched in one switching operation of the inverter. Here, consider a case where the U-phase switch is switched from the lower side to the upper side. V, W-phase lower switch so keep on state, U-phase and V, step-like voltage with a power supply voltage E _d between the W-phase are applied. Since the V-phase and W-phase wires are kept at the same potential, they are equivalent to a single wire, and the voltage applied between U and VW is simulated by a step voltage source. Furthermore, the electric wire connecting the inverter device 2 ′ and the motor 3 ′ is simulated by a set of distributed constant lines (characteristic impedance Zω). FIG. 13 (3) shows the state of voltage propagation when a step-like voltage is applied to the distributed constant line. The horizontal axis is the distance X from the inverter terminal to the motor terminal.
Operation 1: FIG. 13 (3) (a); the input end of the time t = 0 with the distributed constant line is a step voltage of amplitude E _d is applied, the voltage propagates toward the motor terminal.
Operation 2: FIG. 13 (3) (b); When the propagation wave ν ₀ = E _d reaches the motor terminal at time T _k , the reaching wave is reflected at the motor terminal according to the reflection coefficient Γ _M , and is returned to the inverter side. A reflected wave having an amplitude Γ _M · E _d propagates. However, it is given by Γ _M = (Z _M −Z _ω ) / (Z _M + Z _ω ), and generally Z _M >> Z _ω , so here it approximates to Γ _M = 1.
Operation 3: FIG. 13 (3) (c); When the motor end reflected wave Γ _M · E _d reaches the inverter output terminal, the voltage wave multiplied by the reflection coefficient Γ _I at the inverter end propagates again to the motor terminal side. . However, it is given by Γ _I = Γ _M = (Z _I −Z _ω ) / (Z _I + Z _ω ), and generally Z _I << Z _ω , so here it approximates Γ _I = −1. At this time, the reflected voltage of the inverter terminal reverses the arrival wave and the amplitude polarity.
Operation 4: FIG. 13 (3) (d); propagating wave which has reached again the motor terminals is reflected again by the reflection coefficient gamma _M, propagates to the inverter side.
When the above operation is repeated, the voltage wave observed at the motor terminal is shown as in FIG. That is, the voltage wave to which the step voltage is applied at the inverter terminal reaches the motor terminal after time T _k , and (1 + Γ _M ) E _d is generated as the motor terminal voltage ν _M. After that, the voltage wave re-arriving at the motor terminal from the inverter end is Γ _I · Γ _M · E _d, so the voltage ν _M at the motor end is (1 + Γ _M + Γ _I Γ _M ² ) E _d . Here, when Γ _M = 1 and Γ _I = −1, the motor terminal voltage ν _M = 0. That is, the motor terminal voltage [nu _M is a vibrating voltage having approximately twice the amplitude of the inverter step voltage E _d. The actual distributed constant line has propagation loss, the inverter output voltage is not an ideal step wave, and there is a slight capacitance between the motor terminals, so the actual motor surge voltage is shown in FIG. As shown in (5), it becomes a damped oscillation waveform similar to a sine wave.

Next, the operation principle of the present invention will be described with reference to FIG. As with the prior art, the inverter output voltage, step voltage of amplitude E _d, the wiring between the inverter and the motor is equivalent to a set of distributed constant lines (line 1). Also, the wiring connecting the motor and the rectifier circuit is equivalent to a similar distributed constant line (line 2). In addition, the characteristic impedances of the line 1 and the line 2 are respectively Z _ω1 and Z _ω2 . Furthermore, the rectifier circuit is equivalent to a single-phase rectifier circuit. {See Fig. 7 (1)}
FIG. 7B shows the state of voltage propagation when a step-like voltage is applied to the distributed constant line. The horizontal axis is the distance X from the inverter terminal to the rectifier circuit.
Operation 1: FIG. 7 (2) (a); the input terminal of the distributed constant line at time t = 0 is a step voltage of amplitude E _d is applied, the voltage propagates toward the motor terminal.
Operation 2: FIG. 7 (2) (b); the propagation wave ν ₀ = E _d reaches the motor terminal at time T _k . At this time, the reflection coefficient Γ ₁ from the motor end of the line 1 to the inverter end is Γ ₁ = (Z _M2 _{−Z ω1} ) / (Z _M2 + Z _ω1 ), where Z _M2 = Z _M · Z _ω2 / (Z _M + _Zω2 ). Here, in general, the impedance Z _M of the motor is sufficiently larger than the characteristic impedance of the line 2 and can be approximated to (Z _M >> Z _ω2 ) and Z _M2 = Z _ω2 . Here, if the characteristic impedances of the distributed constant lines of the line 1 and the line 2 are set so that Z _ω1 = Z _ω2 , it can be approximated to Γ ₁ = 0. That is, the propagation wave that has propagated along the line 1 and reached the motor end propagates to the line 2 as it is. Therefore, only a voltage equivalent to the propagation wave is generated at the motor terminal, and no surge voltage having a voltage value higher than that is generated.
Operation 3: FIGS. 7 (2) and 7 (c); the propagating wave propagated to the line 3 reaches the AC terminal of the rectifier circuit.

At this time, the reflection coefficient Γ _X reflected from the line 2 at the rectifier end is expressed by the following mathematical formula.

At this time, if the current wave i _X reaching the rectifier end of the line 2 is i _X = ν _X / Z _{ω 2} and the voltage value ν _X of the voltage propagation wave is ν _X = E _d , The current wave i _X flows into the AC input terminal of the rectifier circuit.

At this time, the reflection coefficient Γ _X is expressed by the following mathematical formula.

Here, since ν _X is equal to E _d , the reflection coefficient Γ _X = 0, and all the voltage waves propagating through the line 2 are propagated to the rectifier circuit side, and the AC terminal voltage of the rectifier circuit is held at E _d . Is done.
As a result, the voltage waveform at the motor terminal does not generate a surge voltage exceeding the inverter DC voltage value, as shown in FIG.

Next, consider a case where the output voltage of the inverter is not an ideal step voltage but has a rise time _Tr as shown in FIG. At this time, the voltage wave and current wave propagating toward the AC input terminal of the rectifier circuit are shown as shown in FIG. At this time, the waveform of the voltage wave ν _X and current wave i _X that propagates through the line 2 and reaches the AC input terminal of the rectifier circuit and the waveform of the current i _R that flows into the AC input terminal of the rectifier are described in FIG. become that way. That is, after the pulse wave is generated in the inverter, when the sum of the propagation time T _k1 of the line 1 and the propagation time T _k2 of the line 2 (T _k1 + T _k2 ) elapses, the pulse wave of the inverter is applied to the AC input terminal of the rectifier circuit. And then, during the rise time _Tr , the rectifier input voltage ν _X rises. In addition, since the current wave i _X propagating through the line 2 is given by ν _X / Z _ω2 , the current wave that reaches the AC input terminal of the rectifier 2 also rises with a rise time _Tr . On the other hand, if ν _x does not reach the DC voltage of the rectifier circuit, the current i _R cannot flow into the AC input terminal of the rectifier circuit. Therefore, during this period, the current arrival wave of the line 2 is totally reflected to the line 2 side. In other words, even if the AC input voltage of the rectifier circuit is applied, no current flows therethrough, so that the AC input impedance of the AC circuit is transiently infinite. Accordingly, since the reflection coefficient Γ _X = 1 at the AC input terminal of the rectifier circuit during this period, the waveform component in the rising period of the propagation wave that has reached the AC input terminal of the rectifier circuit is reflected to the motor terminal side, and the motor Generates a surge voltage at the terminal. On the other hand, after the rising period of the reaching wave ν _X ends and rises to the DC voltage of the rectifier circuit, all the reaching current waves i _X become equal to the input current i _R of the rectifier circuit, and thus the above equation (2) is established. Thus, the reflection coefficient Γ _X = 0, voltage reflection to the motor side is eliminated, and the surge voltage at the motor terminal is suppressed. A method for suppressing the surge voltage at the motor terminal caused by the waveform of the rise time without causing the reflection that occurs during the rise time of the arrival wave to the rectifier circuit as described above will be described below.

In the first measure (Examples 4, 5, and 6), as shown in FIG. 9A, a capacitor having an appropriate capacitance is connected between the AC input terminals of the rectifier circuit. FIG. 9B shows an example of voltage and current waveforms at the connection point between the line 2 and the AC input terminal of the rectifier circuit at this time. When the voltage wave ν _X and the current wave i _X reach the rectifier circuit via the line 2, the current _ic flows into the capacitor C _X as the voltage ν _X increases. At this time, although not flow AC input current i _R of the rectifier circuit, the current wave propagating through the line 2 flows to C _x, the AC input impedance of the rectifier circuit, apparently, will be dropped, the reflection coefficient Γ _x becomes smaller than 1, and reflection of the surge voltage to the motor side can be reduced.
At this time, as the size of the capacitor C _x , as shown in FIG. 9B, it is preferable to select a capacitance such that the current _ic flows only during the rising period of the reaching wave ν _x .
Rise time T _r of the propagating wave has passed, after which the voltage amplitude has reached the E _d, since the flow into all the propagation current rectifier circuit, since the (2) is established, without subsequent reflection occurs Therefore, the surge voltage at the motor terminal is suppressed.
Although this explanation has been given with a single-phase equivalent circuit, in order to realize this with an actual three-phase circuit, the capacitor is Δ-connected, star-connected, or a capacitor in parallel with the diode of the rectifier circuit. it is obvious that it is sufficient to ensure a flowing path of the current i _X connected.

As shown in FIG. 10 (1), the second policy (Embodiment 7) is that a resistance _Rx equal to the real component of the characteristic impedance of the line 2 and an appropriate capacitance are provided at the AC input terminal of the rectifier circuit. connecting a series circuit of a capacitor C _x with. At this time, the magnitude of C _x, when the RC series circuit, the value of a constant R _x · C _x is, it is desirable to take the value of C _x to be sufficiently larger than the rise time of the pulse wave .
FIG. 10B shows an example of voltage and current waveforms at the connection point between the line 2 and the AC input terminal of the rectifier circuit at this time. When the voltage wave ν _x and current wave i _x reach the rectifier circuit via the line 2, the AC input impedance of the rectifier circuit is infinite during the period when ν _x does not reach the DC voltage of the rectifier circuit. The current i _X flows as the current i _RC of the RC series circuit, and _if the value of C _x is sufficiently large, a current approximate to i _RC = ν _x / R _x flows. At this time, since R _x = Z _ω2 , i _RC = i _x and all the reaching current waves flow through the RC series circuit, and as a result, the reflection coefficient Γ _x = 0 is held.
Rise time T _R of the propagating wave has passed, after which the voltage amplitude has reached the E _d, since the flow into all the propagation current rectifier circuit, since the (2) is established, without subsequent reflection occurs Therefore, the surge voltage at the motor terminal is suppressed.
In addition, although this description was demonstrated with the single-phase equivalent circuit, in order to implement | achieve this with an actual three-phase circuit, RC series circuit is delta-connected, star-connected, or parallel to the diode of a rectifier circuit. it is obvious that it is sufficient to ensure a flowing path of the current i _x by connecting a capacitor. Next, each example of the present invention will be described in detail.

Example 1 of the present invention is shown in FIG.
As shown in FIG. 13 (1), the conventional system has a configuration in which a filter 9 ′ is connected to electric wires 31 ′, 32 ′, 33 ′ on the main line in which the inverter 2 ′ and the motor 3 ′ are connected by electric wires. is there. On the other hand, the configuration of the first embodiment of the present invention branches from the

main line wires

31, 32, 33 to connect the

subordinate line wires

41, 42, 43, and then the

AC terminal

51, 52, 53 are connected to the

subordinate lines

41, 42, 43, and a capacitor 8 is connected to both ends of the

DC terminals

54, 55 of the rectifier 4. Finally, the

DC terminals

54, 55 are connected to the inverter device. This is a surge energy regenerative type surge voltage suppression system connected to the two

DC terminals

14 and 15. Here, in the first embodiment of the present invention, the

DC terminals

54 and 55 of the rectifier 4 are connected to the

DC terminals

14 and 15 of the inverter device 2 and returned, thereby reducing surge energy loss as much as possible and suppressing surge noise. It becomes possible to regenerate the surge energy to the DC power supply of the inverter.

A second embodiment of the present invention is shown in FIG.
In the configuration of the second embodiment of the present invention, in the first embodiment, the characteristic impedance of the

electric wires

31, 32, 33 of the main line is equal to or substantially equal to the characteristic impedance of the

electric wires

41, 42, 43 of the branched dependent lines. It is an equal surge energy regenerative surge voltage suppression method. In the second embodiment of the present invention, the effect of canceling is generated by making it equal to or approximately equal to the characteristic impedance. The rectifier 4 rectifies the surge voltage and regenerates it to the inverter input.

Example 3 of the present invention is shown in FIG.
The configuration of the third embodiment of the present invention is that in the first and second embodiments, the DC voltage of the rectifier 4 is equal to or approximately equal to the peak value of the output voltage pulse voltage of the inverter device 2. This is a voltage suppression method.

Example 4 of the present invention is shown in FIG.
The configuration of the fourth embodiment of the present invention is such that capacitors 71, 72, 73 star-connected between the

AC terminals

51, 52, 53 of the rectifier 4 of the first, second, and third embodiments, or a Δ connection. This is a surge energy regenerative surge voltage suppression method for connecting the

capacitors

81, 82, and 83. Here, the role of the capacitor is to determine the propagation current by the RC series circuit until the propagation voltage rises to the inverter DC power supply voltage so that no reflection occurs at the rectifier diode input due to the difference between the initial propagation voltage and the inverter DC power supply voltage. It is used to prevent the propagation wave from being reflected. Since the operation principle of the fourth, fifth, and sixth embodiments has already been described, the description is omitted.

A fifth embodiment of the present invention is shown in FIG.
The configuration of the fifth embodiment of the present invention is that in the first, second, and third embodiments, the

RC series circuits

91, 92, 93, and 94 are star-connected to the

AC terminals

51, 52, and 53 of the rectifier 4, respectively. , 95, 96, or a Δ-connected

RC series circuit

101, 102, 103, 104, 105, 106, which is a surge energy regenerative surge voltage suppression method. Here, the role of the RC series circuit is the impedance of the RC series circuit until the propagation voltage rises to the inverter DC power supply voltage so that no reflection occurs at the rectifier diode input due to the difference between the initial propagation voltage and the DC power supply voltage of the inverter. It matches and prevents reflection.

Example 6 of the present invention is shown in FIG.
The configuration of the sixth embodiment of the present invention is a surge energy regenerative surge voltage suppression system in which the capacitor 8 is connected in parallel with the diode 6 of the rectifier 4 in the first, second, and third embodiments. Here, since the role of the capacitor has been described in the fourth embodiment, the description thereof is omitted.

Example 7 of the present invention is shown in FIG.
The configuration of the seventh embodiment of the present invention is a surge energy regenerative type surge voltage suppression system in which an RC series circuit is connected in parallel with the diode 6 of the rectifier 4 in the first, second, and third embodiments. Here, since the role of the RC series circuit has been described in the fifth embodiment, the description thereof is omitted.

Example 8 of the present invention is shown in FIG.
The configuration of the eighth embodiment of the present invention is such that the rectifier 4 and the associated circuit of the first to seventh embodiments are installed in the vicinity of the motor 3 or relatively away from the inverter device 2. This is a surge energy regenerative surge voltage suppression method for connecting between the DC line and the DC line of the inverter device 2.

Embodiment 9 of the present invention is shown in FIG.
The configuration of Embodiment 9 of the present invention is that in Embodiments 1 to 8, the DC terminal of the second rectifier (400) is connected to the DC terminal of the rectifier 4, and the AC terminal of the second rectifier (400) is connected. The voltage of a capacitor connected to the AC terminal of the inverter device 2 and connected to the DC terminal of the second rectifier (400) and the DC terminal of the rectifier 4 in common and connected to the DC circuit. This is a surge energy regenerative type surge voltage suppression system in which a voltage stabilizing device (500) for maintaining a constant value is connected. Here, the ninth embodiment of the present invention is a system in which wiring is not performed on the inverter device 2 side but directly connected to the AC terminal of the main line. Also, if the voltage stabilizer can generate the desired voltage, the second rectifier (400) can be omitted.

Embodiment 10 of the present invention is shown in FIG.
The configuration of Embodiment 10 of the present invention is that in Embodiments 1 to 9, the DC terminal of the second inverter device (600) is connected to the DC terminal of the rectifier 4, and the AC of the second inverter device (600) is connected. This is a surge energy regenerative surge voltage suppression system in which an output terminal is connected to an AC output terminal of the inverter device 2. Here, a second inverter device (600) prepared separately is connected to the DC terminal of the rectifier 4, and the switch of each phase of this inverter circuit is the same switch as the switch of the corresponding phase of the circuit of the inverter device 2. By performing this, energy is regenerated to the AC output side of the circuit of the inverter device 2, and the energy is regenerated and the surge can be suppressed without connecting the DC terminal output to the input of the inverter device 2. . Further, as in the ninth embodiment, the tenth embodiment is a system in which wiring is not performed on the inverter device 2 side but directly connected to the AC terminal of the main line.

Example 11 of the present invention is shown in FIG.
The configuration of the eleventh embodiment of the present invention is the voltage stabilizing device (500) for maintaining the voltage of the capacitor connected to the DC circuit at a constant value at the DC terminal of the rectifier 4 in the first to tenth embodiments. This is a surge energy regenerative type surge voltage suppression system that connects the two. Here, in Example 9, the DC terminal of the rectifier 4 is connected to the DC terminal of the second inverter device (600), and the AC output terminal of the second inverter device (600) is connected to the AC terminal of the inverter device 2. Instead of being connected to the output terminal, Example 11 of the present invention regenerates surge energy to the voltage stabilizing device (500) instead. Thereby, the wiring which returns to the inverter apparatus 2 side becomes unnecessary.

Although the embodiment 12 of the present invention is not shown in the drawing, the configuration of the embodiment 12 of the present invention is generally the same as that of the embodiment 1 to 11 except that the electric wire 7A of the used coaxial line or multi-core cable is connected to the motor side. This is a surge energy regenerative surge voltage suppression method connected to the subordinate line. Here, the multi-core cable includes a shielded cable.

A thirteenth embodiment of the present invention is shown in FIG.
The configuration of the thirteenth embodiment of the present invention is that in the first to eleventh embodiments, the conductor 16 is coated with a high-resistance conductive material (plating) 17 for promoting the attenuation of the high-frequency surge voltage component, and the high-frequency surge is coated thereon. In order to promote attenuation of the voltage component, a high dielectric constant insulator and / or a high dielectric loss insulator 18 is applied, and a surge suppression wire 7B having a shield 19 provided thereon is used as a subordinate line on the motor side. This is a connected surge energy regenerative surge voltage suppression method. In the first to eleventh embodiments, the impedance correction is performed using the capacitor and the series circuit of the resistor and the capacitor. However, the surge suppression wire 7B having the configuration described above (Patent Registration No. Patent No. 4131686) is used. For example, since the amplitude of the propagation wave reaching the AC terminal side of the rectifier 4 is attenuated, the reflected voltage at the AC terminal of the rectifier 4 is reduced, so that impedance correction can be easily performed. Further, a representative example of the surge suppression wire 7B is shown in FIG. 5A, and the present invention is not limited to this, and various modifications are also included.

Example 14 of the present invention is shown in FIG.
The configuration of the fourteenth embodiment of the present invention uses three lines (preferably coaxial lines) 201, 202, 203 as the wiring for connecting the rectifier 4 and the motor 3 in the first to eleventh embodiments. The shield lines 7C of the

lines

201, 202, and 203 are connected to each other at both ends, one core wire of the line is connected to the terminal of the motor 3, and the other terminal is connected to the AC terminal of the rectifier 4. This is a surge energy regenerative surge voltage suppression method. Here, the three lines to be applied may be general lines, but it is desirable to apply a cable in consideration of noise resistance such as electromagnetic induction noise.

Embodiment 15 of the present invention is shown in FIG.
The configuration of the fifteenth embodiment of the present invention is that a surge energy regenerative type using a collective shielded wire (300) having three core wires as a wiring for connecting the rectifier 4 and the motor 3 in the first to eleventh embodiments. This is a surge voltage suppression method.

Example 16 of the present invention is shown in FIG.
The configuration of the sixteenth embodiment of the present invention is the same as in the first to fifteenth embodiments, in which the wiring for connecting the inverter device 2 and the motor 3 and the wiring for connecting the motor and the rectifier are combined into one cable. Type surge voltage suppression method.

By adopting the above configuration, the present invention makes it possible to reduce surge energy loss as much as possible, suppress surge noise, and regenerate surge energy. Next, FIG. 11 (A) shows an example of a conventional cable without a filter, and FIG. 11 (B) shows an example 12 of the present invention that is generally implemented with a multi-core cable 7A used. From this, it can be seen that, in general, Example 12 of the present invention implemented with the multi-core cable 7A being used shows a considerably better result with the conventional cable than the Example without a filter. It is obvious.

Next, Example 13 of the present invention using the surge suppression wire 7B is shown in FIG. From this, the embodiment 13 using the surge suppression wire 7B of the present invention is also compared with the embodiment of the conventional cable without a filter and the embodiment 12 of the present invention implemented with the multi-core cable 7A generally used. Thus, it can be seen that almost no high-frequency vibration associated with the surge voltage is generated, indicating a good result.

Up to now, a typical motor has been illustrated as an example, but not limited to a motor but a general AC device is a target. In addition, the application range of this product can be widely applied to high piezoelectric lamps, power supplies and the like. In addition, it goes without saying that the present invention has various modifications and includes various modifications.

1A, 1B, 1C, 1D, 1E Examples 1, 2, 3, 4, 5 of the present invention
1F, 1G, 1H, 1J, 1K Examples 6, 7, 8, 9, 10 of the present invention
1L, 1M, 1P, 1Q, 1R Examples 11, 13, 14, 15, 16 of the present invention
2 Inverter device 3 Motor 4 Rectifier 5 Transistor 6 Diode 7A Generally used coaxial cable or multi-core cable (including shield)
7B Surge suppression wire 7C Shield wire 8 Capacitor 10

Resistance

11, 12, 13

Output terminal

14, 15 DC terminal 16 Conductor 17 High resistance conductive material (preferably plated)
18 High dielectric constant insulator and / or high dielectric loss insulator 19

Shield

21, 22, 23

Terminal

31, 32, 33 Main line

electric wire

41, 42, 43 Subordinate line

electric wire

51, 52, 53

AC terminal

54, 55 DC terminal 71, 72, 73

Capacitor

81, 82, 83

Capacitor

91, 92, 93

Resistor

94, 95, 96

Capacitor

101, 102, 103

Resistor

104, 105, 106

Capacitor

201, 202, 203 Line (preferably coaxial line )
300 shielded wire 400 second rectifier 500 voltage stabilizing device 600 second inverter device P, P1 DC terminal (+)
N, N1 DC terminal (-)
R, S, T Motor three-phase input terminal U, V, W Inverter three-phase output terminal 1 'Conventional example 2' Inverter device 3 'Motor 5' Transistor 8 'Capacitor 9' Filter 10 'Resistor 20' Inductor 31 ' , 32 ', 33' Main line wires

Claims

In a motor driven by an inverter device, in a circuit configuration in which an excessive surge voltage generated at the power supply terminal of the motor due to the switching operation of the switching element in the inverter device is generated, the output terminal of the inverter device and the motor terminal The rectifier AC terminals are connected to the motor terminals by subordinate line cables branched from the main line cables, and capacitors are connected to both ends of the rectifier DC terminals. The surge energy regenerative surge voltage suppression system, wherein the DC terminal is connected to a DC terminal of the inverter device.
The surge energy regenerative surge voltage suppression according to claim 1, wherein the characteristic impedance of the main line electric wire is equal to or substantially equal to the characteristic impedance of the branched subordinate line electric wire. method.
3. The DC voltage of the rectifier according to claim 1, wherein the DC voltage of the rectifier is equal to or substantially equal to a peak value of the output voltage pulse voltage of the inverter device. Surge energy regenerative surge voltage suppression method.
A capacitor connected in a star connection or a capacitor connected in a Δ connection is connected between each of the AC terminals of the rectifier according to any one of claims 1, 2, and 3. The listed surge energy regenerative surge voltage suppression method.
4. A structure according to claim 1, wherein a star-connected RC series circuit or a Δ-connected RC series circuit is connected to each of the AC terminals of the rectifier. The surge energy regenerative surge voltage suppression method described in any of the above.
4. The surge energy regenerative surge voltage suppression system according to claim 1, wherein a capacitor is connected in parallel with the diode of the rectifier.
4. The surge energy regenerative type surge voltage suppression system according to claim 1, wherein an RC series circuit is connected in parallel with the diode of the rectifier.
8. The rectifier according to claim 1 and the accompanying circuit are installed in the vicinity of the motor or in a place relatively distant from the inverter device, and the DC line of the rectifier and the DC line of the inverter device are connected. The surge energy regenerative type surge voltage suppression system according to any one of claims 1 to 7.
The DC terminal of the second rectifier is connected to the DC terminal of the rectifier, the AC terminal of the second rectifier is connected to the AC terminal of the inverter device, and further the second rectifier A voltage stabilizing device is connected in common to the DC terminal of the rectifier and the DC terminal of the rectifier, and is used to hold the voltage of the capacitor connected to the DC circuit at a constant value. The surge energy regenerative surge voltage suppression method according to any one of 8.
10. The direct current terminal of the second inverter device is connected to the direct current terminal of the rectifier, and the alternating current output terminal of the second inverter device is connected to the alternating current output terminal of the inverter device. The surge energy regenerative type surge voltage suppression system according to any one of claims 1 to 9.
11. The voltage stabilizer according to claim 1, wherein a voltage stabilizing device for holding a voltage of a capacitor connected to the DC circuit at a constant value is connected to a DC terminal of the rectifier. The surge energy regenerative surge voltage suppression method described in any of the above.
The surge energy regeneration according to any one of claims 1 to 11, characterized in that, in general, an electric wire of a coaxial line or a multi-core cable used is connected to a dependent line on the motor side. Type surge voltage suppression method.
12. A high dielectric constant insulator and / or a high dielectric material and / or a high resistance conductive material is coated on a conductor to promote attenuation of a high-frequency surge voltage component, and a high-frequency surge voltage component is further accelerated on the conductor. 12. The surge suppression wire having a structure in which a dielectric loss insulator is applied and further shielded thereon is connected to a subordinate line on the motor side, according to any one of claims 1 to 11. Surge energy regenerative surge voltage suppression method.
12. The wiring according to claim 1, wherein three lines are used as wiring for connecting the rectifier and the motor, shield lines of the line are connected to each other at both ends, and one core of the line is a motor. The surge energy regenerative type surge voltage suppression system according to any one of claims 1 to 11, wherein the surge energy regenerative type surge voltage suppression system is connected to a terminal and the other terminal is connected to an AC terminal of the rectifier.
The surge energy according to any one of claims 1 to 11, wherein a collective shielded wire having three cores is used as a wiring for connecting the rectifier and the motor. Regenerative surge voltage suppression method.
The wiring according to claim 1, wherein the wiring connecting the inverter device and the motor and the wiring connecting the motor and the rectifier are combined into one cable. The listed surge energy regenerative surge voltage suppression method.