JP2005340615A - Resistor and motor driving electric power conversion system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology which prevents an ignition or smoke of a resistor for the regenerative power consumption of a motor driving electric power conversion system. <P>SOLUTION: The resistor for the regenerative power consumption is configured such that a winding region where a resistance value of a resistive line per unit winding width is larger than the other winding region is formed partly, to be wound on a core, and a heating value by energization is larger in the winding region than in the other winding region. When the resistive line is disconnected by an excessive current, the disconnection occurs in the winding region having a large resistance value. Further, in the winding region where the resistance value of the resistive line is large, when the resistive line is disconnected by the excessive current, a distance between the resistive line and a case is set to a distance in which an arc discharge between the resistive line and the case is prevented from generating, to suppress an ignition, a smoke or an enlargement of a burnout. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power converter for driving a motor, and more particularly to a configuration of a resistor that consumes regenerative power.

  Conventionally, in a motor drive power converter, when the motor rotation is decelerated, the motor is operated as a generator, and the generated power is returned to the motor drive power converter as the regenerative power, and the regenerative power is converted to the power converter. It is made to consume as heat energy with the resistor in the apparatus. For example, Japanese Patent Application Laid-Open No. 5-336758 (Patent Document 1) discloses a thyristor switch and a failure determination circuit in parallel with a regenerative resistor as a technique for preventing the regenerative resistor (resistor) that consumes regenerative power from burning. A configuration in which the above is provided is described.

JP-A-5-336758

In a conventional motor drive power conversion device, when regenerative power is consumed as thermal energy by a resistor, if an excessive current due to the regenerative power flows to the resistor, the resistance wire of the resistor is within the housing. I try to break. At this time, an arc is generated, and as a result, ignition and smoke are generated, and further, burning of each part in the casing is increased, which is often a problem in terms of safety. Further, the technology described in the above publication is only for preventing the regenerative resistor (resistor) from being burned out, and for suppressing the ignition, smoke generation, and the expansion of the burnout in the case when the regenerative resistor is destroyed. It's not technology.
In view of the state of the prior art, the problem of the present invention is that when an excessive current flows through a resistor that consumes regenerative power and is destroyed in a motor drive power conversion device, such as ignition, smoke generation, and expansion of burning. It is to be able to suppress the occurrence.
An object of the present invention is to solve the above-described problems and provide a power conversion device technology for driving a motor that can ensure safety.

In order to solve the above problems, according to the present invention, in a power converter for driving a motor, as a resistor for regenerative power consumption, a resistance wire has a resistance value per unit winding width larger than that of other winding regions. It is wound around the core with a part of the winding region formed, and the heat generation amount of the winding region is larger than the heat generation amount of other winding regions when energized, and the resistance wire is caused by an excessive current. In the case of disconnection, the disconnection is generated within the range of the winding region and is not generated in the other winding region. Further, in the winding region where the resistance value of the resistance wire is large, the distance between the resistance wire and the housing is such that when the resistance wire is broken by energization of an excessive current and the resistor is destroyed, The distance between the casing and the arc can be suppressed.
Specifically, the present invention proposes a resistor having the above basic configuration requirements and a motor driving power converter using the resistor.

  ADVANTAGE OF THE INVENTION According to this invention, in the motor drive power converter device, problems, such as ignition at the time of destruction of the resistor which consumes regenerative electric power, smoke, and expansion of burning, can be improved, and safety can be improved. .

Hereinafter, the best embodiment of the present invention will be described with reference to the drawings.
1A and 1B are configuration example diagrams of a resistor for a power converter for driving a motor according to a first embodiment of the present invention. FIG. 1A is a plan view of the inside of the housing, and FIG. is there.

In FIG. 1, 100 is a resistor, 101 is a resistance wire, 102 is a core material, 103 is a return wire, 104 is a lead wire, 105a is a connection portion for connecting one end of the resistance wire 101 to the lead wire 104, 105b Is a connection part for connecting the other end of the resistance wire 101 to one end of the return line 103, 105c is a connection part for connecting the other end of the return line 103 to the lead line 104, and 106a, 106b, 106 are housings. The body 201 is a winding region in which the resistance value per unit winding width (unit winding width in the X direction) of the resistance wire 101 is made larger than that of other winding regions, and 202 is another winding region ( winding region other than the winding region 201), _{w 1} is at both ends in the width direction of the core member 102 a width (Y-direction dimension) of the core 102 of a portion where the resistance wire 101 is wound (Y-direction) width parts is concave portion, w ₂ is Width of the portion both end portions in the width direction of the core member 102 a width of the core 102 of the part antifibrinolytic 101 is wound is not concave, g _1a, the thickness direction (Z-direction of the core member 102 ), The distance between the resistance wire 101 of the winding region 201 and the housing 106a, g _1b is the distance between the resistance wire 101 of the winding region 201 and the housing 106b in the Z direction, and g _2a is Z The distance between the resistance wire 101 in the winding region 202 and the housing 106a in the direction, g _2b is the distance between the resistance wire 101 in the winding region 202 and the housing 106b in the Z direction, and g _1c is the width of the core member 102. The distance g _1d between the resistance wire 101 and the return wire 103 in the winding region 201 in the direction (Y direction) is the resistance wire 101 and the housing 106 in the winding region 201 in the width direction (Y direction) of the core material 102. Is the distance. In the winding region 201, the resistance value per unit winding width of the resistance wire 101 becomes the maximum in the winding regions 201 and 202, that is, the resistance per unit winding width of the resistance wire 101 in the winding region 201. The value is set to be larger than the resistance value per unit winding width of the resistance wire 101 in the winding region 202. In the winding region 201, the resistance value per unit winding width is increased by increasing the winding density of the resistance wire 101 as compared with the winding region 202. The distances g _1a , g _1b , and g _1c are distances at which no arc is generated between the resistance wire 101 and the housings 106 a, 106 b, and 106. The distance g _1d is the distance between the resistance wire 101 and the return wire 103. The distance is such that no arc occurs between them. In this configuration, the resistance wire 101, the core material 102, the return wire 103, the lead wire 104, the connecting portions 105a, 105b, 105c, and the like constitute a winding structure.

In the above configuration, when an excessive current flows through the entire resistance wire 101 when the regenerative power is consumed, the amount of heat generated by the resistance value of the resistance wire 101 in the winding region 201 becomes larger than the amount of heat generated in the other winding regions 202. The resistance wire 101 is disconnected in the winding region 201. However, since the distances g _1a , g _1b , g _1c , and g _1d have sufficient values, the resistance wire 101 and the casings 106a, 106b, and 106 and the return wire 103 are The occurrence of arc during the period is suppressed. By suppressing the occurrence of arcs between them, it is possible to suppress ignition, smoke generation, and expansion of burnout in the housing, thereby ensuring safety.

In the configuration of FIG. 1B, the casings 106a and 106b are configured to locally secure the distances g _1a and g _1b in the Z direction at the winding region 201, respectively. The distances g _1a and g _1b may be ensured over the entire winding area including the winding areas 201 and 202 (hereinafter, this configuration is referred to as a modified embodiment of the first embodiment).
FIG. 2 is a configuration example diagram of a motor drive power converter as a second embodiment of the present invention. The resistor of the present invention is used as the resistor for regenerative power consumption. In the following, the components used in FIG. 2 used in FIG.

  In FIG. 2, 300 is a motor drive power conversion device, 301u, 301v, and 301w are AC power supplies, N is a neutral point thereof, 302 is a grounding unit that grounds the neutral point N by B type (second type grounding), 303 is a converter for converting AC power from AC power supplies 301u, 301v, and 301w into DC power, 304 is a smoothing capacitor, and 100 is a resistor for regenerative power consumption. 305 is a switching transistor for turning on / off the connection of the resistor 100, 306 is an inverter for converting DC power into AC power, 307 is a main body case of the motor driving power converter 300, and 308 is When the electric leakage occurs in the motor drive power converter 300, the main body case 307 is grounded in the D type (third type grounding) in order to release the leakage current and prevent an electric shock. Grounding unit, 311, a motor driven by a motor drive power converter 300, 312 is a load of the motor 311.

  In the above configuration, during the power running operation, AC power from the AC power supplies 301 u, 301 v, 301 w is converted in the motor driving power conversion device 300, and the converted power is supplied to the motor 311. That is, AC power from the AC power supplies 301u, 301v, 301w is input to the motor drive power conversion device 300, and is converted into DC power by the converter 303 in the motor drive power conversion device 300, and the DC power is smoothed. The DC power smoothed by the capacitor 304 is converted into predetermined AC power by the inverter 306, and the AC power is output to the motor 311 side. The motor 311 is rotationally driven by the AC power and drives the load 312.

On the other hand, during the regenerative operation, the motor 311 is rotationally driven by the energy of the load 312 to operate as a generator, and the generated power (AC power) is supplied to the motor drive power conversion device 300 side. AC power (hereinafter referred to as regenerative power) supplied from the motor 311 is converted into DC power by the inverter 306. In the motor drive power conversion device 300 having the configuration shown in FIG. 2, the converter 303 does not have a function of converting power into the AC power supplies 301u, 301v, and 301w. For this reason, the regenerative electric power supplied from the motor 311 is accumulated in the smoothing capacitor 304. When the supply of regenerative power to the smoothing capacitor 304 exceeds the allowable accumulation amount, the smoothing capacitor 304 is destroyed. In this configuration, in order to perform the regenerative operation without destroying the smoothing capacitor 304, the switching transistor 305 is turned on when the DC voltage _VDC across the smoothing capacitor 304 exceeds a predetermined value. Regenerative power is supplied to the resistor 100, and the regenerative power is consumed as thermal energy by the resistor 100. When the DC voltage _VDC becomes equal to or lower than a predetermined value, the switching transistor 305 is turned off and regenerative power is accumulated in the smoothing capacitor 304. That is, the resistor 100 prevents the smoothing capacitor 304 from being destroyed by consuming the regenerative power so that the DC voltage _VDC does not exceed a predetermined value. When the regenerative power is consumed in the resistor 100, the heat energy (heat generation amount) generated in the resistance wire 101 in the winding region 201 in the resistor 100 is the heat energy (heat generation amount) generated in another winding region. ) And the current due to the regenerative power is excessive, the resistance wire 101 is melted in the winding region 201. Since the direct current voltage _VDC is continuously applied to the resistance wire 101 even during the fusing, an arc is easily generated between the fusing portions of the resistance wire 101. However, in the resistor 100 of FIG. 1 of the present invention, the distances g _1a , g _1b , g _1d between the resistance wire 101 and the housings 106 a, 106 b, 106, and between the resistance wire 101 and the return wire 103. Since each of the distances g _1c has a sufficient value, even if an arc is generated between the melted portions of the resistance wire 101, the resistance wire 101 and the casings 106a, 106b, 106 and the return wire 103 are During this period, arcing is suppressed. Suppressing the occurrence of arcs at the location prevents ignition, smoke generation, and expansion of burnout in the housing, thereby ensuring safety and driving the housing 106a, 106b, 106 of the resistor 100 and the motor. A ground fault current is also prevented from flowing between the main body case 307 of the power conversion apparatus 300 and safety from this point is also ensured.

  FIG. 3 is a diagram illustrating a configuration example of a resistor for a power converter for driving a motor as a third embodiment of the present invention. The resistor according to the third embodiment is different from the resistor according to the first embodiment in that the wire cross-sectional area of the resistance wire in the winding region 202 is a resistance wire in the winding region 201. Smaller than that, and the winding density in the winding region 201 is made higher than that in the winding region 202 so that the resistance value per unit winding width of the resistance wire in the winding region 201 is increased. This is the case.

In FIG. 3, 101 ′ is a resistance wire in the winding region 201, and g _1a ′ is between the resistance wire 101 ′ in the winding region 201 in the thickness direction (Z direction) of the core material 102 and the housing 106a. The distance, g _1b ′, is the distance between the resistance wire 101 ′ of the winding region 201 and the housing 106b in the Z direction. The configuration of the other parts is the same as that in FIG. In this configuration, the resistance wires 101 and 101 ′, the core member 102, the return line (not shown), the lead wire (not shown), the connection portion (not shown), and the like constitute the winding structure.

In the above configuration, when an excessive current flows through the resistance wires 101 and 101 ′ when the regenerative power is consumed, the amount of heat generated by the resistance wire 101 ′ in the winding region 201 is changed to the amount of heat generated by the resistance wire 101 in the other winding region 202. The resistance wire 101 ′ is disconnected (melted) within the winding region 201. However, the distances g _1a ′, g _1b ′, and the distance (not shown) between the resistance wire 101 ′ of the winding region 201 and the return line (not shown) in the width direction (Y direction) of the core material 102, the core material 102. The distance (not shown) between the resistance line 101 ′ of the winding region 201 and the housing in the width direction (Y direction) of the case has a sufficient value, so that the resistance line 101 ′ Arc generation between the casings 106a and 106b and the return line can be suppressed. By suppressing the occurrence of arcs at the location, ignition, smoke generation, and expansion of burnout in the housing are suppressed, and safety is ensured. When the resistor 100 is used for regenerative power consumption in the motor drive power converter as shown in FIG. 2, the casings 106a and 106b and the body case of the motor drive power converter (shown in the figure). The ground fault current is also prevented from flowing in between, and safety from this point is also ensured. In particular, in the configuration of the third embodiment, the resistance value of the resistance wire 101 ′ in the winding region 201 can be easily increased, and the difference from the resistance value of the resistance wire 101 in the other winding region 202 can be easily increased. Therefore, when an excessive current flows through the resistance wires 101 and 101 ′, the resistance wire 101 ′ in the winding region 201 can be surely disconnected (melted).

In the configuration of FIG. 3, the casings 106a and 106b are configured to locally secure the distances g _1a ′ and g _1b ′ in the Z direction at the winding region 201, respectively. The distances g _1a ′ and g _1b ′ may be ensured over the entire winding area including the line areas 201 and 202 (hereinafter, this configuration is referred to as a modification of the third embodiment).

  As a motor drive power converter using the resistor as the third embodiment or the resistor as a modification of the third embodiment as a resistor for regenerative power consumption, for example, in the configuration of FIG. A configuration in which the resistor as the third embodiment or the resistor as a variation thereof is used as the regenerative power consumption resistor 100 can be considered. The operation and effect of the motor drive power conversion device are the same as those described with reference to FIG.

FIG. 4 is a configuration example diagram of a resistor for a motor-driven power converter as a fourth embodiment of the present invention. Unlike the resistor of the first embodiment and the resistor of the third embodiment, the resistor of the fourth embodiment has a resistance value per unit winding width of the resistance wire larger than the others. In this example, the winding region 201 is provided on the end side of the entire winding region including the winding region 202. The configuration of the other parts is the same as in the case of the first and third embodiments, or in the case of the respective modified embodiments.
Also in the resistor of the fourth embodiment, a modification similar to the modification of the first and third embodiments can be considered (hereinafter, the modification is referred to as a modification of the fourth embodiment). ).

  Also in the resistor according to the fourth embodiment or the modified embodiment of the fourth embodiment, the same operations and effects as those of the resistor according to the first, third, or modified embodiments can be obtained. The same applies to the motor drive power conversion device that uses the resistor of the fourth embodiment or its modification as a resistor for regenerative power consumption.

  Among the above-described embodiments or variations thereof, in the configuration using a wire having a small cross-sectional area as the resistance wire of the winding region 201, the winding density of the resistance wire in the winding region 201 is also higher than the others. However, the winding density may be equal to or less than that of the other winding region 202. Moreover, although the resistor of this invention was demonstrated in the said embodiment or its modification about the case of the resistor for the regeneration electric power consumption of the motor drive power converter device, the resistor of this invention is used for other uses. It may be used.

1 is a configuration example diagram of a resistor as a first embodiment of the present invention. It is a structural example figure of the power converter device for motor drive as the 2nd Embodiment of this invention. It is a structural example figure of the resistor as the 3rd Embodiment of this invention. It is a structural example figure of the resistor as the 4th Embodiment of this invention.

Explanation of symbols

100 ... resistor,
101, 101 '... resistance wire,
102 ... Core material,
103 ... return line,
104 ... leader line,
105a, 105b, 105c ... connection part,
106a, 106b, 106 ... casing
201, 202 ... winding region,
w ₁ , w ₂ ... the width dimension of the core material,
300... Motor drive power converter,
301u, 301v, 301w ... AC power supply,
302, 308 ... grounding part,
303 ... converter,
304 ... smoothing capacitor,
305 ... Switch transistor
306 ... an inverter,
307 ... body case,
311 ... motor,
312 ... Load.

Claims (5)

A resistor comprising a winding structure in which a resistance wire is wound around a core material in a housing,
The winding structure is wound by partially forming a winding region in which the resistance wire has a resistance value per unit winding width larger than that of other winding regions. A resistor having a configuration in which a heat generation amount in a winding region is larger than that in other winding regions.   In the winding structure, a winding region having a resistance value per unit winding width larger than the others is a winding region having a high winding density, a winding region having a small wire cross-sectional area, or a wire cross-sectional area. The resistor according to claim 1, wherein the resistor is formed by a winding region having a small and high winding density.   Either one or both of the casing and the winding structure has a distance between the resistance wire and the casing in the winding region where the resistance value of the resistance wire per unit winding width is large. The resistor according to claim 1, wherein the resistor is configured to be larger than the distance in the winding region.   The winding structure has a part in which the core material is partly concaved at both ends in the width direction so that the width dimension is narrowed, and the resistance wire per unit winding width is provided in the part. A winding region having a resistance value larger than that of the other winding region is arranged, and the distance between the resistance wire in the winding region and the casing is set so that the resistance wire in the other winding region and the housing The resistor according to claim 1, wherein the resistor is larger than a distance between the body. A power conversion device for driving a motor that converts power from an AC power source and supplies the motor to drive the motor,
5. A motor driving power conversion device, wherein the resistor according to claim 1 is used as a resistor for consuming regenerative power from the motor side.

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