Patents by Inventor Rolf Vollmer

Rolf Vollmer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • PERMANENT MAGNET FOR A ROTOR OF AN ELECTRIC MACHINE
    Publication number: 20160065014
    Abstract: A permanent magnet having end surfaces and an envelope curve shaped as a biconvex lens having first and second convex portions, magnetization running in an arcuate manner along the first convex portion between a north pole and a south poles. The permanent magnet runs along the second convex portion in an arcuate manner, and at least one of the magnet's end surfaces within the envelope curve has a connection surface adapted for connecting with a connection device by fusing or by positive engagement. The rotor is preferably pressed onto the shaft of the rotor after the connection device is formed around a connection surface of the permanent magnets by injection molding.
    Type: Application
    Filed: August 31, 2015
    Publication date: March 3, 2016
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Erich Bott, Reiner Seufert, Rolf Vollmer
  • PERMANENTLY-EXCITED DYNAMOELECTRIC MACHINE
    Publication number: 20160065016
    Abstract: A permanently-excited dynamoelectric machine includes a stator and a rotor supported for rotation about an axis. The stator has a winding system, which is embedded in grooves of a material forming a magnetic return path and interacts electromagnetically with permanent magnets of the rotor via an air gap between the stator and the rotor. The permanent magnets are disposed on the rotor, with each individual permanent magnet, on a side facing towards the air gap, having a North and South pole. The rotor, viewed in the circumferential direction, has a pole coverage by the permanent magnets of 100%, i.e. that the permanent magnets viewed in the circumferential direction, are arranged substantially without gaps.
    Type: Application
    Filed: August 31, 2015
    Publication date: March 3, 2016
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Reiner Seufert, Rolf Vollmer
  • Permanent-magnet-excited electric motor with heating device, and operating method
    Patent number: 9160206
    Abstract: The aim of the invention is to provide an electric motor which has a high torque at low rotation speeds and a high power at high rotation speeds. The invention therefore proposes an electric motor with permanent-magnet excitation having a first active part (10), which is fitted with permanent magnets (11), and a second active part (10), which can be moved in relation to the first active part (10) by magnetic force of the permanent magnets (11). The electric motor also has a heating device (12) with which the magnetic field of at least one of the permanent magnets (11) can be weakened by heating the permanent magnets as a function of a speed of the first active part (10) in relation to the second active part (8).
    Type: Grant
    Filed: November 28, 2011
    Date of Patent: October 13, 2015
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Detlef Potoradi, Rolf Vollmer, Dirk Van Riesen
  • ELECTRIC MACHINE WITH PERMANENTLY EXCITED INNER STATOR
    Publication number: 20150280536
    Abstract: An electric machine includes an outer stator having a plurality of windings, an inner stator having a plurality of permanent magnets and arranged within the outer stator in concentric relationship to the outer stator, and a rotor arranged between the outer stator and the inner stator in concentric relationship to the outer and inner stators and movable relative to the outer and inner stators. The rotor includes a mounting element which is made from a non-magnetic material and has a plurality of recesses, with a magnetically soft segment being arranged in each of the recesses. A first cooling device cools the permanent magnets of the inner stator.
    Type: Application
    Filed: March 31, 2015
    Publication date: October 1, 2015
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventor: Rolf Vollmer
  • MAGNETIC RADIAL BEARING WITH A ROTOR LAMINATED IN A STAR-SHAPED MANNER
    Publication number: 20150233421
    Abstract: The losses in a magnetic radial bearing are intended to be reduced. For this purpose, a magnetic radial bearing is provided with a stator and a rotor which is mounted rotatably in the stator, wherein the rotor has a shaft (7), the shaft (7) is surrounded by an annular laminate stack arrangement (5), and the laminate stack arrangement has individual laminates (6). The individual laminates (6) of the laminate stack arrangement (5) are arranged in a star-shaped manner with respect to the axis of the shaft (7).
    Type: Application
    Filed: November 20, 2012
    Publication date: August 20, 2015
    Applicant: Siemens Aktiengesellschaft
    Inventors: Erich Bott, Rolf Vollmer
  • ROTOR OF A DYNAMOELECTRIC ROTARY MACHINE
    Publication number: 20150048697
    Abstract: A reluctance rotor of a dynamoelectric rotary machine has an even number of poles constructed of a material having structural magnetic anisotropy. The magnetic anisotropy of the material is characterized by a first magnetic resistance, a magnetic permeability of ?r>20 and a saturation polarization of >1T in a first spatial direction, and by a second magnetic resistance which is greater than the first magnetic resistance with a magnetic permeability of ?r<1.6 in spatial directions perpendicular to the first spatial direction.
    Type: Application
    Filed: August 15, 2014
    Publication date: February 19, 2015
    Inventor: Rolf Vollmer
  • Electrical machine with a cooling channel and method for manufacturing the same
    Patent number: 8922072
    Abstract: The invention relates to a stator (1) of an electrical machine (10), the electrical machine (10) itself, and a manufacturing method. The stator (1) has a meandering cooling channel (18), wherein the meandering cooling channel (18) is embedded in an element (22), wherein the element (22) comprises a material which is influenced thermally so as to form a shape of the element (22), wherein an iron-containing body (3), for guiding a magnetic field of the stator, is embedded in the element (22).
    Type: Grant
    Filed: August 17, 2010
    Date of Patent: December 30, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventors: Erich Bott, Hubertus Bähr, Rolf Vollmer
  • MAGNETIC RADIAL BEARING HAVING SINGLE SHEETS IN THE TANGENTIAL DIRECTION
    Publication number: 20140339941
    Abstract: The invention relates to an easily mountable and highly dynamic radial bearing. According to the invention, a magnetic radial bearing for the rotatable mounting of a rotor (3) is provided, having a stator (2) that comprises several coil assemblies (6). The coil assemblies (6) are arranged around an axis (1) of the radial bearing in a circumferential direction. Each of the coil assemblies (6) has a laminated core (7) having single sheets. Each of the coil assemblies (6) further has an axial field coil (11) that is wound around the corresponding laminated core (7). The single sheets are stacked in the tangential direction in every laminated core (7).
    Type: Application
    Filed: November 19, 2012
    Publication date: November 20, 2014
    Inventors: Erich Bott, Rolf Vollmer
  • Cylindrical linear motor having low cogging forces
    Patent number: 8853894
    Abstract: Cogging forces of a cylindrical linear motor are reduced with a linear motor having a rotor with eight poles and a stator with 36 toroidal coils (optionally multiples of eighteen toroidal coils) inserted into slots (N1 to N36) (or a multiple of 36 slots). The toroidal coils extend in the circumferential direction of the stator, are of equal size, and are arranged axially one behind the other. All the terminals of the toroidal coils are located in an axially extending connector channel. The two terminals of each coil are connected according to a specific connection scheme.
    Type: Grant
    Filed: May 11, 2012
    Date of Patent: October 7, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventors: Michael Fick, Armin Stäblein, Rolf Vollmer
  • MAGNETIC RADIAL BEARING WITH THREE-PHASE CONTROL
    Publication number: 20140097782
    Abstract: A magnetic radial bearing with low eddy current losses is made compact and easily actuable. For this purpose, a radial bearing with four coils (S1, S2, S3, S4) is proposed, said coils lying opposite one another in pairs on two axes (X, Y). The coils are controlled by a three-phase current (U, V and W). The amplitudes of the currents of the phases (U, V and W) are each evaluated using a sine function which is phase-shifted with respect to one another through 120 DEG. The control is performed by a control device at a variable operating point, which fixes the value for the evaluation of the amplitudes for the individual phases corresponding to the respective sine function.
    Type: Application
    Filed: April 25, 2012
    Publication date: April 10, 2014
    Applicant: Siemens Aktiengesellschaft
    Inventor: Rolf Vollmer
  • Linear drive module for a rotary/linear drive
    Patent number: 8674560
    Abstract: The aim of the invention is to provide a cost-effective, easily regulated rotary-linear drive. Therefore, the invention provides for the rotary-linear drive to connect a rotary drive (10) to a linear drive module (11). The linear drive module (11) comprises a rotatable drive-side receiving device for receiving a torque from the rotary drive (10). Additionally, the linear drive module has a linear motor, the armature (15) of which is rotatable, is rotated by a stator (14), and comprises an output element for the purpose of driving the shaft (12) in a rotary-linear fashion. To this end, the linear drive module (11) also comprises a coupling device (16) that couples the receiving device and the armature (15) in a rotationally secure but not linear fashion.
    Type: Grant
    Filed: May 5, 2008
    Date of Patent: March 18, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventors: Thomas Budde, Aziz Inalkac, Mykhaylo Toldonov, Rolf Vollmer
  • PERMANENTLY EXCITED SYNCHRONOUS MACHINE WITH FERRITE MAGNETS
    Publication number: 20140070655
    Abstract: A permanently excited synchronous machine includes a stator; a winding system arranged in grooves of a laminated core of the stator and forming winding overhangs on end faces of the laminated core, and a rotor connected in fixed rotative engagement to the shaft and having ferrite magnets which extend axially beyond the end faces of the laminated core. The rotor electromagnetically interacts with the stator across an air gap there between during operation of the permanently excited synchronous machine to cause a rotation about an axis of rotation. A flux concentration element is provided radially across each of the ferrite magnets of a magnetic pole and bundles magnetic field lines of the ferrite magnet onto an axial length of the laminated core of the stator. The flux concentration elements and held by a fixing element on the ferrite magnets of a magnetic pole.
    Type: Application
    Filed: September 12, 2013
    Publication date: March 13, 2014
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Wolfgang Schneider, Rolf Vollmer
  • ROTOR OF A PERMANENTLY EXCITED SYNCHRONOUS MACHINE
    Publication number: 20140042857
    Abstract: A rotor of a permanently excited synchronous machine includes a shaft capable of rotating about an axis and a laminated core having an axial layering arrangement defined by planes which are aligned perpendicular to the axis. The laminated core has at least two layers of different geometry. A first layer has a plate with a closed outer contour at least at an outer periphery, and a second layer has plural plate segments. The first and second layers of the laminated core are arranged in an axial direction to form axial pockets in interspaces between the plate segments of the second layer and recesses formed radially within the outer contour of the first layer for receiving permanent magnets. An adhesive is provided in radial gaps formed at least in axial sections of the second layer between adjacent plate segments and the permanent magnets.
    Type: Application
    Filed: August 8, 2013
    Publication date: February 13, 2014
    Applicant: Siemens Aktiengesellschaft
    Inventors: Daniel Mader, Rolf Vollmer
  • AXIAL BEARING DEVICE HAVING INCREASED IRON FILLING
    Publication number: 20140028135
    Abstract: An axial bearing device includes an annular electrical sheet arrangement having individual sheets which protrude radially outward. In addition, an electrical coil is provided in the axial bearing device and is inserted into the electrical sheet arrangement to generate a magnetic field in the electrical sheet arrangement. The electric sheet arrangement includes at least two concentric electrical sheet rings. All adjacent electrical sheets of each electrical sheet ring substantially abut at the inner circumference of the respective electrical sheet ring.
    Type: Application
    Filed: March 13, 2012
    Publication date: January 30, 2014
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Rolf Vollmer, Markus Oestreich, Gunnar Schubert
  • PERMANENT-MAGNET-EXCITED ELECTRIC MOTOR WITH HEATING DEVICE, AND OPERATING METHOD
    Publication number: 20130249340
    Abstract: The aim of the invention is to provide an electric motor which has a high torque at low rotation speeds and a high power at high rotation speeds. The invention therefore proposes an electric motor with permanent-magnet excitation having a first active part (10), which is fitted with permanent magnets (11), and a second active part (10), which can be moved in relation to the first active part (10) by magnetic force of the permanent magnets (11). The electric motor also has a heating device (12) with which the magnetic field of at least one of the permanent magnets (11) can be weakened by heating the permanent magnets as a function of a speed of the first active part (10) in relation to the second active part (8).
    Type: Application
    Filed: November 28, 2011
    Publication date: September 26, 2013
    Inventors: Detlef Potoradi, Rolf Vollmer, Dirk Van Riesen
  • ELECTRIC MACHINE WITH PERMANENTLY EXCITED ARMATURE AND ASSOCIATED PERMANENTLY EXCITED ARMATURE
    Publication number: 20130241335
    Abstract: An electric machine includes a stator and an armature which together bound an air gap via which the stator interacts with a magnetic field of a magnetically active part of the armature. The armature includes as the magnetically active part permanent magnets and magnetically soft flux conducting elements which are arranged between the permanent magnets. The magnetically active part of the armature is in at least one direction of extent longer than a magnetically soft flux conducting device of a magnetically active part of the stator in the direction of extent.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 19, 2013
    Applicant: Siemens Aktiengesellschaft
    Inventor: Rolf Vollmer
  • ROTOR WITH PERMANENT EXCITATION, ELECTRIC MACHINE HAVING SUCH A ROTOR AND MANUFACTURING METHOD FOR THE ROTOR
    Publication number: 20130241338
    Abstract: A rotor includes a shaft, a plurality of permanent magnets arranged around the shaft in a circumferential direction for permanent excitation and attached to the shaft by an adhesive bond, and a flux conducting device provided for conducting a magnetic flux of the permanent magnets. The flux conducting device has a plurality of soft-magnetic flux conducting elements. Each flux conducting element is placed between two of the permanent magnets and adhesively bonded thereto.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 19, 2013
    Applicant: Siemens Aktiengesellschaft
    Inventors: Daniel Mader, Rolf Vollmer
  • ROTOR WITH PERMANENT EXCITATION, ELECTRIC MACHINE HAVING SUCH A ROTOR AND MANUFACTURING METHOD FOR THE ROTOR
    Publication number: 20130241324
    Abstract: A rotor includes a shaft and a plurality of permanent magnets which are arranged around the shaft in a circumferential direction for permanent excitation. At least one of the permanent magnets is attached to the shaft by a material joint or formfit. A flux conducting device for conducting a magnetic flux of the permanent magnets has a plurality of separate soft-magnetic flux conducting elements, with each flux conducting element being mounted between two of the permanent magnets and fixed thereto so as to be indirectly held in place on the shaft. At least one of the flux conducting elements has at least one contact area sized to cover an outer edge of one of the permanent magnets in the radial direction.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 19, 2013
    Applicant: Siemens Aktiengesellschaft
    Inventors: Daniel Mader, Rolf Vollmer
  • DRIVE DEVICE FOR ROTATIONAL AND LINEAR MOVEMENTS WITH DECOUPLED INERTIAS
    Publication number: 20130147285
    Abstract: A drive device includes a rotational drive device with a rotating stator and a rotating armature for displacing a shaft in a rotational movement and a linear drive device with a linear stator and a linear armature for displacing a shaft in a linear movement. The rotational drive device and the linear drive device are arranged axially one behind the other, with the rotating armature and the linear armature being connected to a respective shaft section. The shaft sections of the rotating armature and the linear armature are axially aligned and connected to each other in a rotationally fixed manner such that the shaft sections can move axially with respect to each other but they can only rotate together.
    Type: Application
    Filed: April 4, 2011
    Publication date: June 13, 2013
    Applicant: Siemens Aktiengesellschaft
    Inventors: Daniel Mader, Holger Schunk, Rolf Vollmer
  • CYLINDRICAL LINEAR MOTOR WITH LAMINATED STATOR
    Publication number: 20130127267
    Abstract: A cylindrical linear motor includes a cylindrical rotor, and a cylindrical stator arranged in coaxial relationship to the rotor. The stator has a plurality of annular coils which are arranged in coaxial relationship, and a ferromagnetic stator core which includes a plurality of individual laminations which are aligned radially or arranged in a star shape. This reduces a field displacement caused by eddy currents, as a result of which ultimately a time delay in the force buildup is also reduced.
    Type: Application
    Filed: May 11, 2012
    Publication date: May 23, 2013
    Applicant: Siemens Aktiengesellschaft
    Inventors: Michael Fick, Armin Stäblein, Rolf Vollmer