Patents Assigned to Danfoss Compressors GmbH
  • Patent number: 7630180
    Abstract: The invention concerns a motor starter circuit for an induction motor, particularly a single-phase AC induction motor, with a main winding (4) and an auxiliary winding (5) supplied with current, particularly AC, via current supply connections (24, 25), and with a starter switch arrangement (15), which serves the purpose of interrupting the current flow through the auxiliary winding (5) after the start of the motor, the starter switch arrangement (15) interacting with a measuring arrangement serving the purpose of measuring the voltage across the auxiliary winding (5).
    Type: Grant
    Filed: April 26, 2007
    Date of Patent: December 8, 2009
    Assignee: Danfoss Compressors GmbH
    Inventors: Claus Schmidt, Hans Peter Kristensen
  • Patent number: 7619343
    Abstract: The invention provides a rotor for an electrical motor. The rotor comprises both a squirrel cage and a number of magnets and can be inserted e.g. in a line-start motor. To secure the magnets in cavities in a core of the rotor, an end plate is attached to one axial end face by rivet means, and to simplify manufacturing of the rotor, the rivet means forms part of at least one of the short circuit rings of the squirrel cage.
    Type: Grant
    Filed: December 19, 2005
    Date of Patent: November 17, 2009
    Assignee: Danfoss Compressors GmbH
    Inventors: Niels Christian Weihrauch, Peter Scavenius Andersen
  • Patent number: 7610771
    Abstract: A refrigerating apparatus for a refrigerator has an electrical voltage supply and an electrical interface for connection with components of the refrigerator with the interface having a galvanic isolation between an input arrangement connected with the refrigerating apparatus and an output arrangement connected with at least one component of the refrigerator.
    Type: Grant
    Filed: January 13, 2005
    Date of Patent: November 3, 2009
    Assignee: Danfoss Compressors GmbH
    Inventors: Carsten Rothmann, Ole Schebel Bachmann
  • Patent number: 7612481
    Abstract: The invention provides a rotor for an electrical motor, e.g. a line-start motor. The rotor comprises a magnet located in a cavity in a rotor core. The core is laminated from sheets of magnetically conductive material and the magnet is secured in the cavity by an end plate which covers the end face. To avoid short circuiting of the magnet, an aperture is provided in the end plate such that a first portion of the opening into the cavity is in communication with the aperture and such that a remaining, second, portion of the cavity is covered by the end plate to secure the magnet in the cavity independently upon the orientation of the end plate around the center axis.
    Type: Grant
    Filed: December 19, 2005
    Date of Patent: November 3, 2009
    Assignee: Danfoss Compressors GmbH
    Inventors: Niels Christian Weihrauch, Peter Scavenius Andersen
  • Publication number: 20090257892
    Abstract: The invention concerns a suction muffler (1) for a hermetically enclosed refrigerant compressor with a housing (2, 3) having, between an inlet (10) and an outlet (11), a first muffling chamber (8) in the flow direction and a second muffling chamber (9) in the flow direction, an insert (7) being arranged between the muffling chambers (8, 9), the insert (7) having a passage (18) that connects the muffling chambers (8, 9) to each other. It is endeavoured to obtain a certain degree of freedom when positioning the suction mufflers in the case of the compressor. For this purpose, the insert (7) has a tube (12) that is led through the second muffling chamber (9), one end of the tube (12) being led through the housing (2), the other end opening into the first muffling chamber (8).
    Type: Application
    Filed: March 10, 2009
    Publication date: October 15, 2009
    Applicant: Danfoss Compressors GmbH
    Inventors: Christian Svendsen, Sven Eric Nielsen
  • Publication number: 20090251022
    Abstract: The invention concerns a rotor (1) for an electric drive motor of a refrigerant compressor with a cylinder ring (2), several permanent magnets (14) resting on the radial inside of the cylinder ring (2), each permanent magnet (14) forming a ring section, and fixing elements (15) between the permanent magnets (14), said fixing elements (15) engaging a fixing geometry (4, 16) of the cylinder ring (2). It is endeavoured to simplify the manufacturing of such a rotor. For this purpose, the cylinder ring (2) is located in a carrier (5), which comprises a bottom (6) and a circumferential wall (7), the permanent magnets (14, 14a, 14b) resting on the bottom (6), and each fixing element (15, 15a, 15b) comprising at least one projection (17, 18), which covers a side (24) of the permanent magnet (14, 14a, 14b) facing away from the bottom (6).
    Type: Application
    Filed: March 26, 2009
    Publication date: October 8, 2009
    Applicant: Danfoss Compressors GmbH
    Inventors: Frank Holm Iversen, Marten Nommensen, Ekkehard Handke
  • Publication number: 20090236929
    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 endeavoured to achieve a good performance.
    Type: Application
    Filed: March 11, 2009
    Publication date: September 24, 2009
    Applicant: Danfoss Compressors GmbH
    Inventor: Niels Christian Weihrauch
  • Publication number: 20090229303
    Abstract: The invention concerns a refrigerant compressor arrangement (1) with a housing (2, 3) comprising a suction opening (5), a compressor (15), which is arranged in the housing (2, 3), and is connected to the suction opening (5), and a suction connection (20) that is fixed at the housing (2, 3), and comprises a housing section (21) and a tube section (22), the housing section (21) being connected to the suction opening (5) and the diameter of the tube section (22) being different from the diameter of the housing section (21). With such a refrigerant compressor arrangement, it is endeavoured to keep the dimensions small. For this purpose, in the longitudinal direction of the suction connection (20) the housing section (21) and the tube section (22) overlap each other and are connected to each other by a corrugated area (23) with at least one radial corrugation.
    Type: Application
    Filed: January 16, 2009
    Publication date: September 17, 2009
    Applicant: Danfoss Compressors GmbH
    Inventors: Frank Holm Iversen, Marten Nommensen, Heinz Otto Lassen, Ekkehard Handke, Dirk Sommer
  • Publication number: 20090116978
    Abstract: The invention concerns a refrigerant compressor (1) with a cylinder block (4), in which a cylinder (14) is arranged, and a cylinder head (16), which covers the front side of the cylinder (14) and is connected to the cylinder block (4) by means of threaded bolts (18, 19). It is endeavored to achieve a good performance with a small mass of the refrigerant compressor. For this purpose, it is ensured that at least two threaded bolts (18) extend through the cylinder block (4) and are screwed into a common mating thread element (23) at the end projecting from the cylinder block (4).
    Type: Application
    Filed: October 29, 2008
    Publication date: May 7, 2009
    Applicant: Danfoss Compressors GmbH
    Inventors: Jesper Valbjoern, Anders Jacob Madsen, Kristoffer Riemann Hansen
  • Publication number: 20090110585
    Abstract: The invention concerns a refrigerant compressor arrangement with a compressor unit (2) supported in a case by means of springs (12) and comprising at least one bolt (26) with a bolt head (25), a holder (23) being arranged between the compressor unit (2) and at least one spring (12), the holder (23) having in its front a recess, in which the bolt head (25) engages, and which is connected to the spring (12). It is endeavoured to reduce the noise generation during operation of the refrigerant compressor arrangement. For this purpose, the bolt head (25) is arranged in the recess (24) with lateral clearance (34).
    Type: Application
    Filed: October 10, 2008
    Publication date: April 30, 2009
    Applicant: Danfoss Compressors GmbH
    Inventors: Svend Erik Outzen, Jens Erik Nissen, Carsten Petersen
  • Publication number: 20090091200
    Abstract: The invention provides an electrical line-start motor comprising with a stator and a squirrel cage rotor adapted for rotation around a centre axis. The rotor comprises a squirrel cage winding in which a current is induced by corresponding windings of the stator, and a set of permanent magnets. To protect the magnets from excessive heat, the rotor comprises thermal barriers e.g. in the form of cavities located between the squirrel cage winding of the rotor and the magnets. Due to the thermal barriers, the thermal conductivity in a path between the windings and the magnets are reduced and the magnets are protected.
    Type: Application
    Filed: March 2, 2007
    Publication date: April 9, 2009
    Applicant: Danfoss Compressors GmbH
    Inventor: Niels Christian Weihrauch
  • Publication number: 20090091206
    Abstract: The invention concerns a winding head isolation element (1) with a body (2, 3) having a first longitudinal side (5), a second longitudinal side (6), a first transversal side (7) and a second transversal side (8), and a tongue portion (9) projecting from the first longitudinal side (5), the body (2, 3) and the tongue portion (9) being made of a flat material. It is endeavored to keep the efforts and costs for the mounting of the isolation element on a winding head small. For this purpose, the body (2, 3) is deformable around an axis (4) extending transversely to the tongue portion (9) and has at least one opening (21, 22) extending transversely to the tongue portion (9), said tongue portion (9) being adapted for insertion through the opening.
    Type: Application
    Filed: September 12, 2008
    Publication date: April 9, 2009
    Applicant: Danfoss Compressors GmbH
    Inventor: Iwer Nissen
  • Publication number: 20090093909
    Abstract: A control system (12) for controlling a refrigeration system (17) comprising two or more compressors (13a, 13b) (e.g. a twin compressor system). Each compressor (13a, 13b) is connected to an electronic unit (14a, 14b), and the electronic units (14a, 14b) are adapted to communicate appropriate signals to each other when the corresponding compressor (13a, 13b) starts or stops operation. The electronics units (14a, 14b) are further adapted to control the operation of the corresponding compressor (13a, 13b) in response to a signal received from the other electronic unit (14a, 14b). Thereby the control system (12) is adapted to control the operation of the two or more compressors (13a, 13b) in a mutually dependent manner. When one compressor (13a, 13b) of a multi-compressor refrigeration system (17) stops operating, the remaining compressor(s) (13a, 13b) will build up a pressure difference between the pressure side and the suction side.
    Type: Application
    Filed: August 30, 2006
    Publication date: April 9, 2009
    Applicant: DANFOSS COMPRESSORS GMBH
    Inventors: Kristoffer Riemann Hansen, Anders Jakob Madsen, Rune Thomsen
  • Patent number: 7514892
    Abstract: A method and a control system for starting a motor (19), in particular a motor (19) for driving a compressor. The rotational speed (24) of the motor (19) is measured and compared to a minimum value. In the case that ?motor (24) is smaller than the minimum value after a predefined time interval has lapsed, the motor (19) is stopped, and the maximum current level to be supplied by the power source (18) is changed, preferably increased, before a new attempt to start the motor (19) is initiated. Preferably, the voltage (22) supplied to an electronic unit (21) is also measured, and in the case that it drops below a minimum voltage level, the motor (19) is stopped, and the maximum current level is changed, preferably decreased, before a new start attempt is initiated. It is possible to adjust the supplied current level in such a way that power is conserved while sufficient lubricated of the moving parts of the compressor is ensured.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: April 7, 2009
    Assignee: Danfoss Compressors GmbH
    Inventors: Niels Pedersen, Rune Thomsen
  • Publication number: 20090070990
    Abstract: The invention concerns a method for mounting a drive shaft (19) of a compressor, particularly a hermetical refrigerant compressor, which has a motor with a stator (1) and a rotor (23), connected with the drive shaft (19) and located in a rotor opening (4) of the stator (1), a first bearing support (8) and a second bearing support (29) being connected with the stator (1), a first bearing (15) for the drive shaft (19) being mounted in the first bearing support (8) and a second bearing (28) for the drive shaft (19) being mounted in the second bearing support (29). It is endeavoured to provide a method for mounting a drive shaft, in which the use of components with relatively large manufacturing tolerances will still result in a good alignment of the drive shaft in relation to the stator. For this purpose, at least the first bearing support (8) is provided with a positioning stop for the first bearing (15) after mounting the first bearing support (8) on the stator (1).
    Type: Application
    Filed: November 25, 2008
    Publication date: March 19, 2009
    Applicant: Danfoss Compressors GmbH
    Inventors: Frank Holm Iversen, Heinz Otto Lassen, Marten Nommensen, Christian Petersen, Beate Sonksen
  • Publication number: 20090068030
    Abstract: The invention concerns a hermetically enclosed refrigerant compressor arrangement (1) having a hermetically tight enclosure (2), a unit (7) comprising an electrical motor (8) with stator (14) and rotor (15) and a compressor (9) with cylinder head cover (48), and springs (10-12) fixed on the unit (7) via first spring retainers and on the enclosure via second spring retainers (59). It is endeavoured to simplify the design of the spring retaining means. For this purpose, at least one of the elements cylinder head cover (48) and end plate (23) of the stator (14) comprises at least one integrated first spring retainer (49, 50).
    Type: Application
    Filed: August 5, 2008
    Publication date: March 12, 2009
    Applicant: Danfoss Compressors GmbH
    Inventors: Jesper Valbjoern, Kristoffer Riemann Hansen, Anders Jakob Madsen
  • Publication number: 20090065233
    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: August 5, 2008
    Publication date: March 12, 2009
    Applicant: DANFOSS COMPRESSORS GMBH
    Inventors: Kristoffer Riemann Hansen, Dirk Homuth, Hans Peter Kristensen
  • Publication number: 20090068035
    Abstract: The invention concerns a refrigerant compressor arrangement (1) with a compressor block (21) comprising a compressor unit (9) with a cylinder formed in the compressor block, and with a motor (8) having a stator (12) and a rotor (13), the rotor being unrotatably connected to a drive shaft (31) driving the compressor unit (9), the drive shaft (31) being supported in a bearing section (32) of the compressor block (21). It is endeavoured to make the refrigerant compressor arrangement with a smaller total height. For this purpose, the bearing section (32) penetrates an active area of the stator (12) and that the rotor (13) and the drive shaft (31) are connected to each other outside the active area on the side of the rotor (13) facing away from the compressor unit (9).
    Type: Application
    Filed: August 5, 2008
    Publication date: March 12, 2009
    Applicant: Danfoss Compressors GmbH
    Inventors: Jesper Valbjoern, Kristoffer Riemann Hansen, Anders Jakob Madsen
  • Publication number: 20090064499
    Abstract: The invention concerns a method and a blank (30) for manufacturing a compressor block of a small-type refrigeration appliance, particularly for a hermetically enclosed refrigerant compressor arrangement, the blank comprising a handling section (34) and at least two working areas (43, 46). The blank (30) is clamped in a working arrangement at a handling section (34), the blank being worked during maintenance of the clamping. It is endeavoured to reduce the dimensions of a compressor block, though maintaining the opportunity of performing several working steps during one clamping process. For this purpose, it is provided that the handling section (34) is removed after the working.
    Type: Application
    Filed: August 6, 2008
    Publication date: March 12, 2009
    Applicant: Danfoss Compressors GmbH
    Inventors: Jesper Valbjoern, Kristoffer Riemann Hansen, Anders Jakob Madsen
  • Patent number: 7478471
    Abstract: The invention concerns a method for mounting a drive shaft (19) of a compressor, particularly a hermetical refrigerant compressor, which has a motor with a stator (1) and a rotor (23), connected with the drive shaft (19) and located in a rotor opening (4) of the stator (1), a first bearing support (8) and a second bearing support (29) being connected with the stator (1), a first bearing (15) for the drive shaft (19) being mounted in the first bearing support (8) and a second bearing (28) for the drive shaft (19) being mounted in the second bearing support (29). It is endeavoured to provide a method for mounting a drive shaft, in which the use of components with relatively large manufacturing tolerances will still result in a good alignment of the drive shaft in relation to the stator. For this purpose, at least the first bearing support (8) is provided with a positioning stop for the first bearing (15) after mounting the first bearing support (8) on the stator (1).
    Type: Grant
    Filed: May 24, 2005
    Date of Patent: January 20, 2009
    Assignee: Danfoss Compressors GmbH
    Inventors: Frank Holm Iversen, Heinz Otto Lassen, Marten Nommensen, Beate Sönksen, legal representative, Christian Petersen