Industrial machine

{
  "publication_number": "US9127441B2",
  "country": "US",
  "kind": "B2",
  "title": "Industrial machine",
  "abstract": "An industrial machine includes a power converter. The power converter includes: at least one power module; a capacitor; and a bus bar provided between any two among a load to be driven, the power module, and the capacitor. The bus bar includes: a first plate; a second plate; a first spacer configured to support respective corresponding first ends of the first plate and the second plate with a predetermined distance therebetween and to electrically connect the respective first ends of the first plate and the second plate with each other; and a second spacer configured to support respective corresponding second ends of the first plate and the second plate with a predetermined distance therebetween and to electrically connect the respective second ends of the first plate and the second plate with each other.",
  "claims": [
    "1. An industrial machine comprising a power converter, wherein the power converter includes: at least one power module; a capacitor; and a bus bar provided between any two among a load to be driven, the power module, and the capacitor, wherein the bus bar includes: a first plate; a second plate; a first spacer configured to support respective corresponding first ends of the first plate and the second plate with a predetermined distance therebetween and to electrically connect the respective first ends of the first plate and the second plate with each other; and a second spacer configured to support respective corresponding second ends of the first plate and the second plate with a predetermined distance therebetween and to electrically connect the respective second ends of the first plate and the second plate with each other.",
    "2. The industrial machine according to claim 1, wherein the power converter further includes a reactor, and wherein the bus bar is provided between any two among the load, the power module, the capacitor, and the reactor.",
    "3. The industrial machine according to claim 1, wherein the bus bar includes at least one third spacer that is provided in at least one place between the first ends and the second ends of the first plate and the second plate and is configured to electrically connect corresponding places of the first plate and the second plate with each other.",
    "4. The industrial machine according to claim 1, wherein the industrial machine is an industrial vehicle including a traveling mechanism and an upper swivel body mounted on the traveling mechanism so as to be capable of being swiveled, wherein the industrial machine includes an electrical swiveling device configured to control an AC motor that swivels and drives the upper swivel body with respect to the traveling mechanism, and wherein the electrical swiveling device includes a carrier frequency control unit that lowers the carrier frequency of the power converter as a current flowing to the power converter becomes larger, in addition to the power converter that is provided at the upper swivel body to drive the AC motor as the load.",
    "5. The industrial machine according to claim 4, wherein the carrier frequency control unit changes the carrier frequency during swiveling acceleration of the AC motor.",
    "6. The industrial machine according to claim 4, wherein the carrier frequency control unit changes the carrier frequency during swiveling deceleration of the AC motor.",
    "7. The industrial machine according to claim 4, wherein the carrier frequency control unit lowers the carrier frequency as the temperature of the power module constituting the power converter becomes higher.",
    "8. The industrial machine according to claim 4, wherein the carrier frequency control unit keeps the carrier frequency constant when a current flowing to the power converter is equal to or lower than a predetermined value, and lowers the carrier frequency linearly according to the current when the current flowing to the power converter becomes higher than the predetermined value."
  ],
  "description_excerpt": "1. Technical Field\n\nThe present invention relates to an industrial machine using a power converter.\n\n2. Description of the Related Art\n\nIn recent construction machines including a power shovel or a crane, a hybrid type of a hydraulic motor and an AC motor is used as a power source of an upper swivel body. The hybrid type swiveling power source assists a hydraulic motor with the AC motor during acceleration of the upper swivel body, performs a regenerative operation with an AC motor during deceleration, and charges a battery with power generation energy. The pertinent technique is disclosed in the related art. Additionally, for example, a power converter for driving the electric motor is also mounted in industrial machines other than the construction machines, for example, a forklift and a forging press machine.\n\nThe power converter (inverter) for driving the AC motor includes a plurality of switching elements that are provided for respective phases of the AC motor, a controller that generates a control signal modulated according to the target torque (or target rotation speed) of the AC motor, and a driver that drives the plurality of switching elements on the basis of the control signal.\n\nAccording to an embodiment of the present invention there is provided a power converter includes at least one power module, a capacitor, and a bus bar provided between any two among a load to be driven, the power module, and the capacitor.",
  "cpc": [
    "E02F 3/43",
    "B66F 9/07572",
    "E02F 9/123",
    "E02F 9/2075",
    "E02F 9/2091",
    "E02F 9/2095",
    "H02M 1/007",
    "H02M 2001/007",
    "H02M 3/1582",
    "H02M 5/458",
    "H02M 7/003",
    "H02M 7/5387"
  ],
  "ipc": [
    "B66F 9/075",
    "E02F 3/43",
    "E02F 9/12",
    "E02F 9/20",
    "H02M 1/00",
    "H02M 3/158",
    "H02M 5/458",
    "H02M 7/00",
    "H02M 7/5387"
  ],
  "assignees": [
    "Sumitomo Heavy Industries Ltd"
  ],
  "inventors": [
    "Shinichi Sakamoto",
    "Hideaki Yuasa"
  ],
  "filing_date": "2014-07-22",
  "publication_date": "2015-09-08",
  "grant_date": "2015-09-08",
  "priority_date": "2012-03-26",
  "application_number": "US-201414337651-A",
  "family_id": "49258978",
  "cited_by_count": 1,
  "citations": [
    "JP2524642Y2",
    "JPH0658521U",
    "JPH10103112A",
    "JPH10145941A",
    "US20070103002A1",
    "US20090092956A1",
    "US8639404B2",
    "US20140107881A1",
    "JP2010226782A",
    "JP2010222815A",
    "JP2011129636A"
  ]
}