Patents Assigned to Danfoss Compressors GmbH
  • Publication number: 20110189010
    Abstract: The invention concerns a method of mounting a compressor block on a front side of a stator of an electric motor that comprises a stator bore and a stator axis, a support face arrangement of the compressor block being mounted on a contact area of the stator front side and the compressor block being connected to the stator. It is endeavoured to manufacture a compressor arrangement with a high efficiency. For this purpose, before mounting the compressor block (2) on the contact area (21, 22), the stator (4) is acted upon with a clamping force corresponding to a mounting force, a spatial deviation of the contact area (21, 22) from a plane, to which the stator axis (17) is perpendicular, is determined, the support face arrangement is machined so that the deviation is compensated, and the compressor block (2) is connected to the stator (4).
    Type: Application
    Filed: January 25, 2011
    Publication date: August 4, 2011
    Applicant: Danfoss Compressors GmbH
    Inventors: Marten Nommensen, Norbert Stöcken, Heinz-Otto Lassen, Thorsten Petersen
  • Publication number: 20110114357
    Abstract: A protective cover arrangement (1) for a first electrical unit, e.g. a starter unit (3), mountable on a second electrical unit, e.g. a compressor (2). The protective cover arrangement (1) comprises an outer cover (5) and an inner cover (6). The outer cover (5) comprises mounting parts (8) adapted to cooperate with mounting parts (10) on the second electrical unit in order to mount the outer cover (5) on the second electrical unit. The inner cover (6) is sized and shaped to fit inside the outer cover (5), and it is adapted to accommodate a first electrical unit in an interior part (7). The inner cover (6) comprises an opening (12) allowing electrical connectors (4) to pass from the second electrical unit to the interior part (7), thereby providing electrical connection between the first electrical unit and the second electrical unit.
    Type: Application
    Filed: January 24, 2011
    Publication date: May 19, 2011
    Applicant: Danfoss Compressors GmbH
    Inventors: Kristoffer Riemann Hansen, Dirk Homuth, Hans Peter Kristensen
  • Patent number: 7934913
    Abstract: The invention concerns a piston compressor, particularly a hermetic refrigerant compressor, with a compression chamber, which is limited by a valve plate arrangement having a valve plate with a suction gas opening and a pressure gas opening, a suction valve plate with a suction valve element, and a pressure valve plate with a pressure valve element. It is endeavored to achieve a good efficiency combined with a simple assembly. For this purpose, it is ensured that the pressure valve plate and the suction valve plate are located on the side of the valve plate facing the compression chamber.
    Type: Grant
    Filed: March 24, 2008
    Date of Patent: May 3, 2011
    Assignee: Danfoss Compressors GmbH
    Inventors: Frank Holm Iversen, Marten Nommensen
  • Patent number: 7935888
    Abstract: A protective cover arrangement (1) for a first electrical unit, e.g. a starter unit (3), mountable on a second electrical unit, e.g. a compressor (2). The protective cover arrangement (1) comprises an outer cover (5) and an inner cover (6). The outer cover (5) comprises mounting parts (8) adapted to cooperate with mounting parts (10) on the second electrical unit in order to mount the outer cover (5) on the second electrical unit. The inner cover (6) is sized and shaped to fit inside the outer cover (5), and it is adapted to accommodate a first electrical unit in an interior part (7). The inner cover (6) comprises an opening (12) allowing electrical connectors (4) to pass from the second electrical unit to the interior part (7), thereby providing electrical connection between the first electrical unit and the second electrical unit.
    Type: Grant
    Filed: August 5, 2008
    Date of Patent: May 3, 2011
    Assignee: Danfoss Compressors GmbH
    Inventors: Kristoffer Riemann Hansen, Dirk Homuth, Hans Peter Kristensen
  • Patent number: 7886553
    Abstract: A method and a control unit for controlling a power level being drawn from a power source (26). Based on a determined rate of change of a measured voltage (1) an estimated remaining runtime is calculated. The estimated remaining runtime represents a time where specific run criteria will no longer be fulfilled if the present power level is maintained. The estimated remaining runtime is compared to a threshold value, and in case the estimated remaining runtime is shorter than the threshold value, the power drawn from the power source (26) is decreased. Thereby the runtime for the power source (26) is maximised. This is particularly useful if the power source is a limited power source, such as a battery (26), e.g. for running a compressor (27) for a movable refrigeration system (24). The invention is suitable for automotive applications.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: February 15, 2011
    Assignee: Danfoss Compressors GmbH
    Inventors: Henrik Joergensen, Rune Thomsen
  • Patent number: 7874170
    Abstract: A method and a control unit (4) for controlling a supply of power to an electrical circuit comprising a switch (3). An output voltage of a first power source (5), which is connected to the circuit, is measured and compared to a predefined threshold voltage. If the measured voltage is smaller than the threshold value it is determined that the switch (3) is in a closed state, and if the voltage is larger than the threshold value it is determined that the switch (3) is in an open state. The supply of power is controlled in accordance with the open/closed state of the switch (3). Preferably, the electrical circuit is connected to a second power source (9) when the switch (3) is in a closed state. Power is conserved while it is ensured that sufficient power is available when needed. The invention is very suitable for supplying power to a lamp (1) positioned inside a refrigeration compartment (2), especially when the system is battery powered.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: January 25, 2011
    Assignee: Danfoss Compressors GmbH
    Inventors: Mads Andersen, Claus Schmidt, Ole Bachmann, Rune Thomsen
  • Patent number: 7851963
    Abstract: The invention concerns a rotor of an electrical machine, particularly a driving motor for a hermetically enclosed refrigerant compressor with a body (4) comprising a magnetically conductive material, the rotor having a plurality of axially extending slots (5, 6), which are filled with an electrically conductive material. It is endeavored to achieve a good performance.
    Type: Grant
    Filed: March 11, 2009
    Date of Patent: December 14, 2010
    Assignee: Danfoss Compressors GmbH
    Inventor: Niels Christian Weihrauch
  • Publication number: 20100236401
    Abstract: The invention relates to a method of calibrating a connecting rod arrangement comprising a crankshaft eye and a connecting rod eye. In order to achieve the best possible parallelism between the connecting rod eye and the crankshaft eye a controlled energy input occurs in at least one predefined surface area of the connecting rod, so that outside a neutral axis a local structural change and thus a tension in the connecting rod occurs.
    Type: Application
    Filed: January 21, 2010
    Publication date: September 23, 2010
    Applicant: Danfoss Compressors GmbH
    Inventors: Marten Nommensen, Heinz-Otto Lassen
  • Publication number: 20100237810
    Abstract: The present invention relates to a method for sensorless control of a permanent magnet motor exhibiting saliency, the method comprising the steps of determining a back electromotive force signal of a non-conducting phase winding of the permanent magnet motor, and applying a first drive voltage to at least one other phase winding of the permanent magnet motor, said first drive voltage being phase-shifted relative to the determined back electromotive force signal. Moreover, the present invention relates to a control system for carrying out the above-mentioned method.
    Type: Application
    Filed: February 18, 2010
    Publication date: September 23, 2010
    Applicant: Danfoss Compressors GmbH
    Inventors: Peter Scavenius Andersen, Carsten Rothmann, Niels Pedersen
  • Publication number: 20100231155
    Abstract: The present invention relates to a controller unit adapted to be releaseably attached to a corresponding terminal arranged on an exterior surface portion of a motor-driven compressor. The controller unit according to the present invention comprises an electrically isolating carrier member having one or more electrically conductive paths arranged thereon for transporting electrical power signals, the carrier member further having at least one thermally conductive path arranged thereon for transporting heat to a heat sensitive element of the controller unit in order to determine the temperature of the motor of the compressor. The present invention further relates to a method for carrying out the present invention.
    Type: Application
    Filed: November 17, 2009
    Publication date: September 16, 2010
    Applicant: Danfoss Compressors GmbH
    Inventors: Claus Schmidt, Dirk Homuth
  • Patent number: 7777438
    Abstract: Motor start circuit for an induction motor-with a main winding and an auxiliary winding having two end connections supplied with current via current supply connections, and with a start circuit device serving the purpose of stopping the current flow through the auxiliary winding after the start of the motor, and being connected via a conductor to a control device connected between the current supply connections, and with a preset timer device interacting with the start circuit device to stop the current flow through the auxiliary winding, as soon as a predetermined period after the start of the current flow has lapsed. With the purpose of optimizing the motor start circuit, a voltage presetting device, with which a predetermined voltage value can be set, the start circuit device being disconnected if this value is exceeded, and a period duration presetting device, are connected to or integrated in the control device.
    Type: Grant
    Filed: July 11, 2007
    Date of Patent: August 17, 2010
    Assignee: Danfoss Compressors GmbH
    Inventors: Claus Schmidt, Hans Peter Kristensen
  • Patent number: 7777992
    Abstract: Motor start circuit for an induction motor, particularly a single-phase AC induction motor, with a main winding (4) and an auxiliary winding (5), which are supplied with current, particularly alternating current, via current supply connections (24, 25), and with a start switching device (15) serving the purpose of interrupting the current flow through the auxiliary winding (5) after the start of the motor, the start switching device (15) being connected to a control device (20) via a connector (18), the control device (20) being connected between the current supply connections (24, 25), and with a winding protection switch (28), which is normally closed and which opens on the occurrence of a fault. The invention is characterized in that the control device (20) is connected to the winding protection switch (28) via at least one further connector (22, 17), preferably via at least one further connector (22, 17) and the auxiliary winding (5).
    Type: Grant
    Filed: November 6, 2007
    Date of Patent: August 17, 2010
    Assignee: Danfoss Compressors GmbH
    Inventors: Claus Schmidt, Hans Peter Kristensen
  • Patent number: 7722337
    Abstract: The invention concerns a piston compressor cylinder arrangement (1), particularly for a hermetically enclosed refrigerant compressor, with a cylinder body (2) and a cylinder head arrangement (7), the cylinder body (2) having a first front side (6) in the area of the cylinder head arrangement (7) and a second front side (8) at the other end. It is endeavoured to manufacture such a cylinder arrangement in a cost-effective manner without having to fear for a deformation during mounting. For this purpose, a cup-shaped mounting sleeve (9) surrounds the cylinder body (2) over its full axial working length with a radial distance on all sides.
    Type: Grant
    Filed: October 17, 2005
    Date of Patent: May 25, 2010
    Assignee: Danfoss Compressors GmbH
    Inventors: Marten Nommensen, Frank Holm Iversen, Heinz Otto Lassen, Beate Sönksen
  • Publication number: 20100083826
    Abstract: The invention concerns a method of mounting a cylinder arrangement of a hermetically enclosed refrigerant compressor arrangement in a carrier arrangement (14, 15), in which the cylinder arrangement is inserted in the carrier arrangement (14, 15), aligned in relation to a crank shaft (5) and connected to the carrier arrangement (14, 15). It is endeavoured to ensure a good efficiency of the refrigerant compressor arrangement. For this purpose the carrier arrangement is deformed, before inserting the cylinder arrangement, by means of a calibration cylinder (40), until the calibration cylinder (40) has a predetermined alignment, after which the calibration cylinder (40) is removed and replaced by the cylinder arrangement in the carrier arrangement (14, 15).
    Type: Application
    Filed: May 15, 2009
    Publication date: April 8, 2010
    Applicant: Danfoss Compressors GmbH
    Inventors: Frank Holm Iversen, Marten Nommensen, Ekkehard Handke, Norbert Stöcken
  • Patent number: 7686594
    Abstract: The invention concerns a refrigerant compressor arrangement with a compressor having a suction inlet, a casing, in which the compressor is located, a suction socket, which is in communication with the casing, a suction opening in the casing, which is connected with the suction socket, and a telescopic pipe, which is located between the suction inlet and the suction opening in the casing. It is endeavored to manufacture a refrigerant compressor arrangement in a cost-effective manner. For this purpose, the suction opening is surrounded by a drawing through in the casing wall, whose inner wall forms a sliding surface for the telescopic pipe.
    Type: Grant
    Filed: December 13, 2004
    Date of Patent: March 30, 2010
    Assignee: Danfoss Compressors GmbH
    Inventors: Frank Holm Iversen, Marten Nommensen, Heinz Otto Lassen, Christian Petersen
  • Publication number: 20100045216
    Abstract: The present invention relates to a method for bringing a brushless motor, such as a multiphase brushless motor, operatively connected to for example a compressor into an optimal angular starting position in an energy saving manner, the method comprising the steps of applying a first drive voltage to a first phase winding of the motor and measuring a current flowing in another phase winding of said motor, said current being generated in response to the first drive voltage applied to the first phase winding. The method further comprises the step of switching the applied first drive voltage off when said current reaches a steady-state condition. By applying the method of the present invention a significant amount of power can be saved. The present invention further relates to a system for carrying out the present invention.
    Type: Application
    Filed: August 20, 2009
    Publication date: February 25, 2010
    Applicant: DANFOSS COMPRESSORS GMBH
    Inventors: Rune Thomsen, Niels Pedersen
  • Publication number: 20100034679
    Abstract: The invention concerns a refrigerant compressor with a cylinder, in which is arranged a piston (5) that is connected to a crankshaft via a connecting rod (14), the connecting rod (14) having a piston eye (18), through which a bolt (17) inserted in the piston (5) is guided. With such a refrigerant compressor, it is endeavoured to achieve a good efficiency. For this purpose, the bolt (17) is inserted in a blind bore (19).
    Type: Application
    Filed: August 6, 2009
    Publication date: February 11, 2010
    Applicant: Danfoss Compressors GmbH
    Inventors: Brian H. Andersen, Morten Svendsen, Preben Bjerre, Jens Erik Nissen, Martin Damm-Hinrichsen, Sonke Schmidt, Sonke Reinhold, Soren Michelsen
  • Publication number: 20100018245
    Abstract: The invention concerns a hermetically enclosed refrigerant compressor with a housing comprising an electrical feed-through, a connection plate (10) arranged on the outside of the housing in the area of the electrical feed-through, and a base plate (15) supporting the bottom of the housing in the gravity direction. It is endeavoured to obtain low manufacturing costs. For this purpose, the connection plate (10) and the base plate (15) are made together as one part (16).
    Type: Application
    Filed: July 14, 2009
    Publication date: January 28, 2010
    Applicant: Danfoss Compressors GmbH
    Inventors: Anders Jakob Madsen, Olaf Worm, Dirk Homuth, Bjorn Randow
  • Patent number: 7646617
    Abstract: The invention concerns a method for controlling a direct voltage source with a first direct voltage source (2) and a voltage monitoring device (24), which monitors an output voltage of the first direct voltage source (2) and acts upon a control device (31), the control device (31) controlling the working state of the first direct voltage source (2). Further, the invention concerns a voltage supply device (22) with which the method can be used. In this connection it is endeavored to reduce the risk of an increase in voltage in a circuit with several direct voltage sources. For this purpose, a second direct voltage source (3) produces a voltage change at the voltage monitoring device (24).
    Type: Grant
    Filed: March 8, 2006
    Date of Patent: January 12, 2010
    Assignee: Danfoss Compressors GmbH
    Inventor: Rune Thomsen
  • Patent number: D625692
    Type: Grant
    Filed: March 11, 2009
    Date of Patent: October 19, 2010
    Assignee: Danfoss Compressors GmbH
    Inventor: Dirk Homuth