Showing papers by "ebm-papst published in 2012"

Radial Forces in External Rotor Permanent Magnet Synchronous Motors With Non-Overlapping Windings

Abstract: In external rotor permanent magnet synchronous motors with non-overlapping windings, the higher frequency harmonics of the radial forces generate considerable resonant vibrations and acoustic noise. Therefore, diversity of spatial and specifically frequency harmonic ordinal numbers of representative slot and pole number combinations are derived analytically with open circuit and under load. Amplitudes of radial force waves are calculated by means of the finite element method and 2-D Fourier analysis. The obtained results confirm the analytical investigation. Determining factors on amplitudes are studied on machines having different slot and pole numbers and double-layer windings. Higher frequency harmonics significantly depend on the pole and tooth shape as well as the current profile. With open circuit, the calculations are validated by experiments. The findings are applied to reduce the noise of a centrifugal fan.

Rotating electrical machine

Abstract: A rotating electric machine ( 1 ) having a stator ( 4 ) in a housing ( 2 ) and a rotor ( 10 ) supported by a shaft ( 6 ). The housing ( 2 ) circumferential wall ( 12 ) and first and second axially opposing end walls ( 14, 16 ) support bearing flanges with bearings ( 18 ) for the shaft ( 6 ). Two cooling fan impellers ( 20, 22 ) are connected to the shaft ( 6 ). An inner cooling fan impeller ( 20 ) positioned inside the housing ( 2 ) generates an inner cooling air circuit (A) inside the housing ( 2 ). An outer cooling fan impeller ( 22 ) provided outside the housing ( 2 ), generates an outer cooling air flow (B). The first end wall ( 14 ) is formed with a thermal conductivity of at least a specified value and has an outer cooling rib geometry ( 28 ) on its outer side facing the outer cooling fan impeller ( 22 ), and an inner cooling rib geometry ( 30 ) on its opposing inner side.

Axial fan with flow guide body

Abstract: An axial fan (1) having a motor comprising a stator (2) and a rotor (3), wherein blades (4), which move a gaseous medium in an axially directed main flow direction (S) from an inlet side (E) to an outlet side (A) of the fan, project from the outer periphery (U3) of the rotor (3). For enhanced performance with regard to efficiency in a structurally less costly manner, a rotation-symmetric flow guiding element (5) is mounted on the outlet side (A) directly or indirectly on the stator (2) and concentrically with respect to a stator hub (2 a). The flow guiding element to have an outer diameter (D5) that is greater than the outer diameter (D2) of the stator hub (2 a) greater than the outer diameter (D3) of the rotor (3), and smaller than the diameter (D4) of a perimeter (U4) around the blades (4).

Aktive kühlung eines motors mit integriertem kühlkanal

Abstract: Die vorliegende Erfindung betrifft einen Motor, umfassend ein Elektronikgehause (1) mit integrierter Motorelektronik, einen Stator und einen Rotor. Der Stator umfasst eine Statorbuchse (3) und ein Statorblechpaket mit Motorwicklungen. Die Statorbuchse (3) ist axial zwischen Elektronikgehause (1) und Rotor angeordnet. Der erfindungsgemase Motor weist ein mit dem Rotor drehfest verbundenes Luftforderelement (14) und mindestens eine in der Statorbuchse (3) angeordnete axial verlaufende Durchgangsoffnung (24) auf. Das Luftforderelement (14) ist axial zwischen Statorbuchse (3) und Rotor angeordnet und weist auf der Seite der Statorbuchse (3) eine umlaufende axiale Ansaugoffnung (15) auf. Das Luftforderelement (14) saugt im Motorbetrieb einen axialen Luftvolumenstrom (Z) durch die Ansaugoffnung (15) und die Durchgangsoffnung (24) an einer Ausenwand des Elektronikgehauses (1) an.

Stator for an EC-motor and EC-motor with such a stator

Abstract: A stator for a brushless, electronically commutated electric motor having a stator core wound with stator windings and control electronics for controlling the stator windings. The stator core together with the stator windings are enclosed in a molded encapsulation made of a plastic material of a defined thermal conductivity (λSt). The temperature sensor is arranged on the outside at the encapsulation, and the control electronics are designed such that they calculate the temperature in the region of the stator windings on the basis of the temperature detected by the temperature sensor taking into account a specific stator temperature profile stored in a memory. Furthermore, the invention relates to a brushless, electronically commutated electric motor having a stator as described above.

Internal rotor motor

Abstract: An internal rotor motor, in particular an electronically commutated internal rotor motor, has a multi-pole stator (28) and a laminated rotor core (52, 54, 56) which is mounted such that it can rotate relative to said stator (28), and also has a central recess (47) which is provided in the laminated rotor core, wherein the laminated rotor core has individual laminations (41) and the central recesses (47) in said individual laminations have radially inner first sections (50) into which a shaft (18) is pressed, and said central recesses (47) have second sections (51) in the regions between the radially inner first sections (50), said second sections being spaced apart from the outside of the shaft (18) in the assembled state, wherein at least some of the individual laminations (41) of the laminated rotor core (52) are arranged with an angular offset in relation to one another.

Method for life-cycle monitoring of an electrolyte condenser and device with a monitored electrolyte condenser

Abstract: The method involves detecting impedance of an electrolytic capacitor (C) as an actual characteristic value during operation of electrical device under operation conditions for recognizing an approaching lifetime- and/or life utility end of the electrolytic capacitor. The impedance is compared with maximum impedance (Zmax) predetermined as limit characteristic value. A warning signal is produced depending on parameter of determined difference between the actual characteristic value and the limit characteristic value when reaching a preset minimum permissible difference. An independent claim is also included for an electrical device.

Aeroacoustic optimization for axial fans with the lattice-boltzmann method

Abstract: A set of aeroacoustic optimization strategies for axial fans is presented. Their efficiency is demonstrated for small axial fans. Thereby, the generated noise could be reduced significantly while retaining or even improving the aerodynamic performance.In particular, we discuss the following two optimization strategies in detail: Firstly, we consider the design of winglets using a parametric model for genetic optimization. The resulting winglet geometry helps to control the tip vortex over a large range of operating points, thereby reducing the generated noise. In addition, the power consumption of the fan could be reduced. Various choices of geometrical parameter sets for optimization are evaluated.Secondly, we discuss the reduction of fan noise via contour optimized turbulators. For axial fans it is desirable to reduce sound emission across a broad operating range, not just for the design point. However, operation in off-design points may be accompanied by flow separation phenomena, which contribute predominantly to noise generation and reduce the aerodynamic performance of the fan. Turbulators can help to minimize these adverse effects. The advantages of various contoured turbulator geometries are discussed for off-design operating points.The optimization of the above mentioned strategies was driven by aeroacoustic measurements via physical tests as well as numerical analysis based on the Lattice-Boltzmann method. The merits of either method are discussed with respect to the two optimization strategies.Copyright © 2012 by ASME

Method and control system for driving a brushless electric motor

Abstract: In a method and control system for controlling a brushless, electronically commutated electric motor (M), a three-phase source AC voltage (U N ) is rectified and fed to a DC link voltage (U ZK ), which is supplied to an inverter ( 2 ) via a slim DC link circuit ( 6 ). A motor control unit ( 10 ) for PWM pulsing controls the inverter for commutating the electric motor (M) and adjusting the motor speed with a variable duty cycle (A). The duty cycle (A) is influenced by a compensating factor (k) such that the product of the DC link voltage (U ZK ) and a resulting DC link current (I ZK ) is kept constant in the link circuit ( 6 ). The DC link voltage (U ZK ) is monitored. When a first threshold value (U ZKac.max1 ) of an AC component (U ZKac ) is exceeded, the compensating factor (k) is modified to lower the current AC component (U ZKac ) below the threshold value (U ZKac.max1 ).

Method for monitoring life span and for determining remaining life span of technical component, involves determining remaining life span based on all current life span-calculations since initial operation

Abstract: The method involves determining maximum theoretical life span for determined and predetermined operating conditions. The current life span-calculations are carried out cyclically during the operation according to initial operation of the component taking into account the currently existing, actual operating conditions based on measured current operating parameters. The remaining life span is determined based on all the current life span-calculations since the initial operation. An independent claim is included for an electronically commutated electric motor with an electronic controller for executing the method.

Mischvorrichtung zur Mischung von Verbrennungsluft und Gas für ein Gasgerät

Abstract: Die Erfindung betrifft eine Mischvorrichtung zur Mischung von Verbrennungsluft und Gas fur ein Gasgerat, mit einem Gehause mit daran angeschlossener Gaszufuhrung, einem in dem Gehause angeordneten Duseneinsatz, der eine vorbestimmte Durchstromungsquerschnittsflache aufweist. Das Gehause weist einen Einlassbereich auf, der einen sich in Stromungsrichtung verjungenden Einlassabschnitt einer Venturiduse bildet, wobei der Duseneinsatz zumindest einen sich in Stromungsrichtung erweiternden Auslassabschnitt der Venturiduse bildet.

Driving circuit for an EC-motor

Abstract: A control circuit (1) for an electronically commutated, direct current motor (M) without a collector with a semiconductor end stage (2) which is controlled by an electronic commutation control (4) via a driver stage (6) for the time-offset control of the stator coils (U,V,W) of the motor (M) for the purpose of producing a magnetic rotating field for a rotor depending on the rotor rotation position. Two redundant stall protection units (10, 12) monitor the motor (M) during operation for rotation of the rotor, whereby in the case of a determined stall situation, the first stall protection unit (10) deactivates the driver stage (6) and the second stall protection unit (12) shuts off the supply voltage (UVCC) for the driver stage (6).

Diagonal ventilating fan

Abstract: A self-cooling diagonal ventilating fan ( 30; 130 ) has a fan housing ( 36 ) and a fan wheel ( 80 ), rotatable around a rotation axis ( 168 ), that has, associated with it, an electronically commutated motor ( 73 ) which has an internal stator ( 64 ) and an external rotor ( 68, 152 ). Provided on the outer side of the fan wheel ( 80 ) are fan blades ( 82 ) which have, with reference to the rotation direction ( 84 ) of the fan wheel ( 80 ) during operation, a front side ( 114 ) and a back side ( 112 ), such that there occurs on the fan wheel ( 80 ) during operation, adjacent the back side ( 112 ) of each blade ( 82 ), a negative-pressure zone ( 110 ) that is connected via an opening ( 90 ) of the fan wheel ( 80 ) to the wheel's inner side ( 81 ), in order to draw cooling air outward from said inner side. Cooling air, after it emerges from the electric motor ( 73 ), is drawn through the at least one opening ( 90 ) formed in the fan wheel ( 80 ) to the outer side of the fan wheel ( 80 ), in order, during operation, to maintain a constant cooling air stream ( 158 ) in a consistent direction through the electric motor ( 73 ), regardless of possible backpressure.

Control circuit for an EC-motor

Abstract: A control circuit (1) for an electronically commutated, direct current motor (M) without a collector with a semiconductor end stage (2) which is controlled by an electronic commutation control (4) via a driver stage (6) for the time-offset control of the stator coils (U, V, W) of the motor (M) for the purpose of producing a magnetic rotating field for a rotor depending on the rotor rotation position. Two redundant stall protection units (10, 12) monitor the motor (M) during operation for rotation of the rotor, whereby in the case of a determined stall situation, the first stall protection unit (10) deactivates the driver stage (6) and the second stall protection unit (12) shuts off the supply voltage (Uvcc) for the driver stage (6).

Rotierende elektrische maschine

Abstract: Die vorliegende Erfindung betrifft eine rotierende elektrische Maschine (1) als Generator oder Motor, mit einem in einem Gehause (2) angeordneten Stator (4) und einem uber eine Welle (6) um eine Rotationsachse (8) drehbar gelagerten Rotor (10). Das Gehause (2) weist eine Umfangswandung (12) und zwei axial gegenuberliegende, als Lagerflansche mit Drehlagem (18) fur die Welle (6) ausgebildete Stirnwandungen (14, 16) auf. Mit der Welle (6) sind zwei Kuhllufterrader (20, 22) verbunden, und zwar einerseits innerhalb des Gehauses (2) ein inneres, bei Rotation innerhalb des Gehauses (2) einen inneren Kuhlluftkreislauf (A) erzeugendes Kuhllufterrad (20) und andererseits auserhalb des Gehauses (2) ein auseres, bei Rotation eine das Gehause (2) uberstromende ausere Kuhlluftstromung (B) erzeugendes Kuhllufterrad (22). Die auf der Seite des auseren Kuhllufterrades (22) angeordnete erste Stirnwandung (14) ist mit einer hohen Warmeleitfahigkeit von mindestens (Formel I) ausgebildet, und sie weist auf ihrer dem auseren Kuhllufterrad (22) zugewandten Ausenseite eine ausere Kuhlrippengeometrie (28) sowie auf ihrer gegenuberliegenden Innenseite eine innere Kuhlrippengeometrie (30) auf.

Axial or diagonal fan with trip edge on the rotor blade

Abstract: An axial- or diagonal-fan has a fan wheel ( 34 ) having profiled rotor blades ( 32 ). Each blade has a suction or intake side ( 46 ), a portion located forward, with respect to the rotation direction ( 36 ), and having a leading edge ( 44 ), and a portion located rearward, with respect to the rotation direction ( 36 ), and having a trailing edge ( 92 ). Between said portions, on the intake side ( 46 ) of the respective rotor blade ( 32 ), a trip or separation edge ( 66 ) is provided, said trip edge having an S-shaped contour in a meridian cross-section.

Trägerelement für einen Ventilator sowie damit ausgestatteter Ventilator

Abstract: Die vorliegende Erfindung betrifft ein Tragerelement (2) zur Halterung eines Ventilators (1), insbesondere eines Axialventilators, mit einem Wandring (4) zur Aufnahme des Ventilators (1). Der Wandring (4) weist an seinem Ausenumfang ein Scharnier (20) auf, das aus einem mit dem Wandring (4) verbundenen ersten Scharnierteil (22) und einem relativ zu dem ersten Scharnierteil (22) um eine Scharnierachse (X) schwenkbaren zweiten Scharnierteil (24) besteht. Ferner betrifft die Erfindung einen Ventilator (1) mit einem solchen Tragerelement (2).

Stator for an electric motor

Abstract: A stator for an electric motor, in particular for an external rotor motor, has a basic body (3) with a laminated stator core and with stator coils arranged on the laminated stator core. Each of the stator coils has a winding wire start and a winding wire end. Each winding wire start is attached to contact pins. The basic body (3) is extrusion-coated with a sleeve made from plastic, from which contact pins at least partially protrude. In order to reduce the manufacturing costs, a contact holder (2) encased in the sleeve together with the basic body (3) is pushed via the free ends of the contact pins onto the basic body (3), wherein the contact holder (2) encases the contact pins with a sealing section (11) in a gap-free, sealing manner.

Vibration damping receptacle device

Abstract: The invention relates to a vibration damping receptacle device for receiving a motor ( 1 ) on a fan housing wall ( 2 ) having a motor support element ( 3 ) on which a plurality of attachments ( 4 ) are formed, a plurality of receptacles ( 6 ) disposed directly on the housing wall, and a plurality of elastic damping elements ( 5 ) disposed between the attachments and the receptacles such that the axial center axes thereof are each oriented at least in sections in the direction of the motor.

Axial Fan With Additional Flow Channel

Abstract: An axial fan, having an inner electric motor and a fan wheel connected to the electric motor so as to rotate with it and has a plurality of wheel blades defining a blade length and extend outwardly from the electric motor. A fan housing surrounds the fan wheel. The fan housing is connected to the motor via holding struts which extend to the outside from the motor to the fan housing. A motor housing is provided on the motor behind the fan wheel and accommodates a motor electronics system. A flow duct having an inflow opening and an outflow opening is fastened to the motor behind the fan wheel such that the inflow opening is arranged offset to the outside with respect to the outflow opening. The outflow opening is oriented in such a way that an air flow which exits the outlet opening is guided onto the motor housing.

Pump for supplying liquids

Abstract: The pump (1) has a housing (4) including a drive region (2) and a pumping region (3). A drive shaft (5) and a running wheel (6) are located on the drive shaft. 0.1-1.5 mm axial gap dimension (S1) is provided between the housing and a cover disk of the running wheel. The drive shaft is mounted in the drive region and in the pumping region with bearings (7, 7', 7''). An axial spacing (A) between the running wheel and one of the bearings of the drive shaft is smaller or equal to diameter (D) of the running wheel.

Rotational body, particularly rotor of electric motor, is rotatable around assigned rotational axis and has annular path that is concentrically arranged to rotational axis

Abstract: The rotational body (100) is rotatable around an assigned rotational axis (150) and has an annular path that is concentrically arranged to the rotational axis. Two measuring bodies are arranged in the assigned balancing positions in the path. A light-setting viscous fixing material is sectionally provided in the path and fixes the measuring bodies in the assigned balancing positions. The curable viscous fixing material is an adhesive and particularly a light-setting cyanoacrylate- or acrylate adhesive. An independent claim is also included for a method for balancing a rotational body.

Gasregeleinheit in modularer Bauweise und Gasregelventil

Abstract: Die Erfindung betrifft eine Gasregeleinheit in modularer Bauweise, insbesondere zur Regelung der einem Gasbrenner zuzufuhrenden Gasmenge, sowie ein in seiner Gesamtheit als Modul ausgebildetes Gasregelventil, das in einer derartigen, modular aufgebauten Gasregeleinheit verwendbar ist.

Axial or diagonal fan with trip edge on the rotor blade suction side

Abstract: The invention relates to an axial or diagonal fan which has a rotor (34) that is provided with profiled rotor blades (32). Each said rotor blade has a suction side (46), a portion which lies at the front when seen in the rotational direction (36) and which comprises a leading edge (44), and a portion which lies at the rear when seen in the rotational direction (36) and which comprises a trailing edge (92). A separation edge (66) is provided between said two portions on the suction side (46) of the respective blade (32), said separation edge having an S-shaped contour in a meridian cross-section.

Axial- oder Diagonalventilator

Abstract: Ein Axial- oder Diagonalventilator hat ein Laufrad (34), das mit profilierten Laufschaufeln (32) versehen ist. Diese haben jeweils eine Saugseite (46), einen in Drehrichtung (36) gesehen vorne gelegenen Abschnitt mit einer Zustromkante (44), und einen in Drehrichtung (36) gesehen hinten gelegenen Abschnitt mit einer Austrittskante (92). Zwischen diesen beiden Abschnitten ist auf der Saugseite (46) der betreffenden Schaufel (32) eine Ablosekante (66) vorgesehen, die im Meridianschnitt eine S-formige Kontur hat.

Pumpe zur Förderung von Flüssigkeiten

Abstract: Pumpe zur Forderung von Flussigkeiten mit einem Antriebsbereich und einem Pumpbereich, umfassend ein Gehause, eine Antriebswelle sowie ein auf der Antriebswelle angeordnetes Laufrad, wobei zwischen dem Gehause und einer Deckscheibe des Laufrads ein minimales axiales Spaltmas vorgesehen ist und wobei die Antriebswelle sowohl im Antriebsbereich als auch im Pumpbereich mit jeweils mindestens einem Lager gelagert ist.

Diagonal fan having active engine cooling

Abstract: The invention relates to a diagonal fan (30; 130) comprising a fan housing (36) and a fan wheel (80) rotatable about a rotational axis (168), an electronically commutated electric motor (73) being associated with said fan wheel. The electric motor comprises an internal stator (64) and an external rotor (152), the latter being connected to the fan wheel (80) which, on rotation thereof, serves to convey air in a main conveying direction (40) from the air intake side (178) to an air exhaust side (180). On the exterior of the fan wheel (80) fan blades (82) are provided which, in relation to the direction of rotation (84) of the fan wheel (80) in operation, have a front face (114) and a rear face (112), wherein in the region of the rear face (112) of each blade (82) a negative pressure zone (110) occurs at the fan wheel (80) during operation, which negative pressure zone is connected via an opening (90) in the fan wheel (80) to the interior (81) thereof in order to extract cooling air from said interior to the exterior. A seal arrangement (174), which in operation counteracts a pressure equalisation between the pressure (P2) on the air exhaust side (180) and the pressure (P3) in the interior (81) of the fan wheel (80), is arranged between said interior (81) and the air exhaust side (180) of the fan. At least one intake opening (154) is provided in the region of the air intake side (178) of the fan wheel (80), through which opening cooling air is able to flow into the electric motor (73); after emerging from the electric motor (73) the cooling air is extracted through the at least one opening (90) in the fan wheel (80) to the exterior of the fan wheel (80) in order to maintain a constant cooling air flow (158) in a uniform direction in operation through the electric motor (73).

Dichtung einer Strömungsmaschine

Abstract: Die Erfindung betrifft ein Gehause einer Stromungsmaschine mit einem Oberteil und einem Unterteil, wobei das Oberteil dichtend mit dem Unterteil verbindbar ist und an dem Oberteil mindestens ein sich in Richtung des Unterteils erstreckender Steg und an dem Unterteil mindestens ein sich in Richtung des Oberteils erstreckender Steg ausgebildet ist, wobei im zusammengebauten Zustand der mindestens eine Steg des Oberteils an dem mindestens einen Steg des Unterteils uber eine vorbestimmte Lange in Langsrichtung derart anliegt, dass zumindest einer der Stege in Querrichtung elastisch gebogen wird und im anliegenden Bereich mindestens eine Dichtflache gebildet ist.

Mischvorrichtung zur Mischung von Verbrennungsluft und Gas sowie Feuerungseinrichtung

Abstract: Die Erfindung betrifft eine Mischvorrichtung zur Vormischung von Verbrennungsluft und Gas mit einem Gasregelgerat und einem Gasauslass und eine Duse, wobei an der Duse oder einem an der Duse angeordneten Uberbruckungselement ein Gaseinlass vorgesehen ist, und der Gasweg von dem Gasauslass zu dem Gaseinlass durch eine sich von dem Gasauslass zu dem Gaseinlass erstreckende Dichtung abgedichtet ist.

Support frame for axial fan

Abstract: The device has a stretcher support frame (4) with a bosh clamp and bosh base for connection with a printed circuit board (2). A small fan (3) has a fan propeller (31) which rotates around a rotational axis, such that air is transported via a circular air passage opening (47) of the board. An air directing unit (5) is provided on a side of the opening at the frame and returns flow direction of part of the air transported via the opening.