Abstract: A fan has a fan housing (2) which is formed with a pot-shaped recess (4) and it has an external-rotor drive motor (103) having an internal stator (22) and an external rotor (34), separated from each other by an air gap (52). The internal stator (22) is mounted on a bearing support tube (24) which is connected to a base part (46). The arrangement of bearing support tube (24) and base part (46) form, together with the pot-shaped recess portion (4) of fan housing (2), a substantially fluid-tight annular space (54) enclosing the inner stator (22). A wall (56) defining this annular space (54) extends in the manner of a canned motor through the air gap (52) between inner stator (22) and external rotor (34).

Abstract: A metering system for metering a liquid has an electric motor (32) for setting a desired feed rate, by modifying the rotation speed of the electric motor. It furthermore has an eccentric drive (52, 56), drivable by said electric motor (32), for a pump (53) that has two delivery directions. It also has a pump ring (62) made of an elastomeric material and a stationary ring (70) which is arranged relative to the pump ring (62) and to the eccentric drive (52, 56) in such a way that a pump chamber (120), extending in a circumferential direction, is formed between the stationary ring (70) and pump ring (62). The chamber changes shape upon rotation of the electric motor (32) in order to deliver a liquid to be metered through the pump chamber (120). A stationary seal (142) is provided in the pump chamber (120), between two fluid ports.

Abstract: An electric fan has a drive motor having a fan rotor, an apparatus for generating a rotation speed signal (n_i), an apparatus for generating a power level signal (P_i) that represents power consumed; a first regulator (n_RGL) for regulating the rotation speed signal (n_i) to a predefined target value (n_s); a second regulator (P_RGL) for regulating the power level signal (P_i) to a predefined power level signal target value (P_s) that corresponds to a predefined minimum consumed power level (P_min), where the first regulator (n_RGL) and the second regulator (P_RGL) apply at least one control output signal (SW) to the drive motor and interact in such a way that, during operation, the at least one control value (SW) in a first state is determined by the first regulator (n_RGL), and in a second state is determined by the second regulator (n_RGL).

Abstract: A fan has an impeller (20) that is equipped with blades (26, 28, 30, 32, 34; 58). The blades are configured so that the blade loading of individual blades differs during operation. As a result of this variable blade loading, the frequencies associated with the blade-passing noise (BPF) of the fan can be distributed over a broader frequency spectrum, and thus have a less obtrusive effect.

Abstract: A fan device including an electric motor assembly (24, 26) designed to drive at least one blade wheel (34, 36) in a flow channel (18) provided axial to the blade wheel, an electronic assembly (38, 40), which forms commutator and/or ballast electronics for the electric motor assembly, is arranged in series with the electric motor assembly, and is produced on a circuit carrier, and a carrier unit (14) formed axially on or in the flow channel for retaining the electric motor assembly, wherein the carrier unit, which forms an inner circumference of the flow channel at least in sections, is made from a thermally conductive material, wherein the carrier unit has, on an outer segment (16) radially opposite to the flow channel, a mounting and cooling surface for interacting with the circuit carrier and/or power electronics components provided thereon in a heat-dissipating manner.

Abstract: An electric motor has an internal stator (21) and an external rotor (2). The external rotor (2) has a rotor housing (3) and a plurality of magnets (9) mounted therein and is adapted to rotate around a rotation axis (10); the magnets (9) are preferably bar magnets; the rotor housing (3) has an inner surface (7), a first end (5), and a second end (6) located opposite the first end (5) and the inner surface defines respective receiving surfaces (11) for reception of the magnets. each receiving surface features a channel depression (13) to receive a magnet (9). The magnets (9) are each fastened on a respective one of the receiving surfaces (11) with the aid of an adhesive mounting agent (36). A first bearing seat (14) for reception of a first bearing cage (15) is formed at the second end (6) of the rotor housing (3).

Abstract: An electronically commutated motor (32) has, associated with it, a circuit board (36) having arranged thereon a temperature sensor for generating a temperature signal. Provided are: A first arrangement for continuous determination of the prospectively still-available service life of the motor (32); a second arrangement (20, 236) for sensing a first value that is dependent on the temperature signal (33) and that characterizes the temperature (T_S) adjacent the circuit board (36); a third arrangement (240; 244) for sensing a rotation speed (n) of the motor (32); a memory (31) for storing a digital third value (Cr) for the prospectively still available service life of the motor (32); a calculation apparatus (30) which calculates an estimated still-available service life and an output apparatus (83) for the results. A current service life correction value (?t) is preferably also generated as a function of the electrical power and/or of the current and voltage.

Abstract: An electric motor (100) features a external stator (28), an internal rotor (150) rotatably mounted within the external stator, the rotor having a lamination stack (200, 200?, 200?) composed of a plurality of rotor plates (201, 201?, 201?) in which are formed at least one first recess (614) and at least one second recess (630), a rotor magnet (224) being located in each first recess (614), the second recess (630) being associated with a jamming element (40) mounted therein. A clamping member (692,694) is arranged between the first recess (614) and the second recess (630). The clamping member and the second recess (630) are shaped so as to enable support of the jamming element (40) on the lamination stack, and to permit application of a force (F) on the clamping member in the direction of the rotor magnet. The second recess (630) serves as a through-opening for receiving a shaft (40), and the shaft (40) serves as the jamming element (40).

Abstract: An electric motor (10) has a stator (20) having a number S of stator poles (21, 22, 23, 24, 25, 26); a rotor (40) having a rotor magnet (40?), which rotor magnet (40?) has a number R of rotor poles (41, 42, 43, 44, 45, 46), R being equal to S, and the rotor (40) or the stator (20), or both, exhibiting a magnetic asymmetry. The asymmetry facilitates startup. The electric motor has a single-phase winding arrangement (30) with first (11), second (12) and third (13) terminals. Current can be made to flow, selectively, from either the first or the second terminal, through certain coils, to the third terminal (13). There is an output stage (50), preferably an H-bridge. The W total coils comprise a plurality of subgroups (TG1, TG2) of coils. A method for current flow through an electric motor utilizes these sub-groups (TG1, TG2) for current flow.

Abstract: A mounting apparatus (30) for mounting a fan arrangement (40) on a seat (100), for example a vehicle seat, features a cylindrical sleeve or installation element (10) which secures within the seat, and a fan housing (50) for the fan arrangement or module (40), which slides into, and latches within, the cylindrical sleeve (10). The fan housing (50) has a tubular housing part (54) having a first housing part end (51) and a second housing part end (52) located axially opposite it. The fan module (40) includes a centrally located fan (80,81) supported by a plurality of radial struts (86), at least one of which serves as a channel (89) for power supply connecting wires (92). Wire pass-through openings (26, 64, 64?) are configured to permit a partial rotation of the fan module (40) during installation into the cylindrical sleeve (10).

Abstract: A ventilation apparatus (500) serves to cool the seat cushion (120) of a seat (100), in particular of a vehicle seat. This seat cushion (120) has a seating surface (122), a rear face (127) and an underside (121). The underside (121) of the seat cushion (120) and the seat frame (110) form a cavity (190). The ventilation apparatus (500) has a radial fan (515) for arrangement in said cavity (190), which radial fan (515) has an inlet (512) and an outlet (518). An air distribution arrangement (530) connects to the output of a U-shaped air deflection device (520) that extends from the air outlet (518) of the radial fan (515) to an inlet (532) of the air distribution arrangement (530) and includes a plurality of air deflection conduits (525).

Abstract: A blower arrangement having n fans, where n>1, has a housing arrangement for receiving said fans (24, 26, 28). The housing arrangement features a) a first housing part (22) having flow-through openings (76) that are each associated with one of the fans, and having at least one installation opening (78) through which a fan can be introduced into said first housing part (22) and can be mounted in the region of the associated flow-through opening (76); and b) a second housing part (40) that is connected, on one side, to the first housing part (22) on the side thereof having the at least one installation opening (78), and, on the other side, defines an air exit opening (42).

Abstract: An electric motor (40) has a permanent-magnet rotor (46) and an apparatus for generating a three-phase sinusoidal current (i202, i204, i206) for supplying current to said motor (40), also a microprocessor (95) for executing the following steps: while the motor (40) is running at a substantially constant load, the motor is operated firstly at a predetermined operating voltage (U), and an amplitude of a current flowing to the motor is iteratively sampled, stored, and compared as applied voltage is decreased. If it is found, in this context, that the current flowing to the motor has not decreased as a result of reduction in the voltage amplitude, the motor (40) is operated at that current. If, however, it is found that the current flowing to the motor has decreased as a result of the reduction in the voltage delivered to the motor (40), the measurements and the comparison are repeated, optionally multiple times, in order to identify values for optimized efficiency.

Abstract: A mixed-flow fan features a housing (42); an impeller (43) journaled rotatably with respect to the housing, and equipped with fan blades (54); a generally cylindrical air conduit (50) defined between the fan housing and the impeller, the fan blades extending into the air conduit in order, during operation, to transport air; an external-rotor motor (75) having an internal stator (100) and an external rotor (81) which includes a tubular ferromagnetic yoke (63) partly embedded in material of the impeller. A cup-shaped yoke (72) fits into a central cavity (68) of the tubular yoke (63) and accommodates a permanent magnet arrangement (66) which interacts with the stator. The tubular yoke (63) and the cup-shaped yoke (72) together serve as a magnetic return path for the external-rotor motor. The structure minimizes damage during final assembly, and simplifies insertion of balancing weights.

Abstract: A mini-fan has a drive motor having an external rotor (222) and an internal stator (244). The external rotor (222) is equipped with a rotor shaft (234) that has a necked down portion (258) in the region of its free end (235). The mini-fan (216) has a bearing tube (238) on whose outer side the internal stator (244) is mounted and in whose interior is arranged a bearing arrangement (236) in which the rotor shaft (234) is rotatably supported. A closure arrangement (262) serves to close off the bearing tube (238) in liquid-tight fashion at one end, and is equipped, in the region of the necked down portion (258) of the rotor shaft (234), with at least one resilient securing member (260) that engages into that necked down portion (258) and secures the rotor shaft (234) against being pulled out of the bearing arrangement (236).

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.

Abstract: An electric motor (20) has a stator (30) and a rotor (26). The latter is equipped with a cup-like rotor part (56) and with a ring magnet (60) adhesively bonded therein, which magnet has an outer circumference (61) on which are provided elevations (84) and depressions (86) that extend at least partly in the longitudinal direction of the ring magnet (60). The outer circumference (61) of the ring magnet (60), that faces toward the cup-like rotor part (56) after assembly, is formed with at least one opening or channel (68; 69, 88), extending in a circumferential direction, that is connected to at least a plurality of the flat depressions (86). Positive mechanical engagement between adhesive and ring magnet enhances durability, and discourages any tendency toward relative rotation between the magnet (60) and the cup-like rotor part (56).

Abstract: An electronically commutated one-phase motor (20) has a stator having at least one winding strand (30, 32) and a permanent-magnet rotor (22). The rotor, as it rotates, induces a voltage (uind) in the at least one winding strand (30, 32). The motor has an electronic calculation device (26), preferably a microcontroller ?C, which is configured to execute, during operation, the steps of a) sensing the value of the instantaneous operating voltage (Ub); (b) using the operating voltage value (Ub) and optionally further parameters, adjusting a time duration (TON) of a switch-on current pulse (i30) for the motor, in order to apply a consistent amount of electrical energy to the windings during start-up attempts, thereby maximizing the probability of successful start-up, regardless of possible fluctuations in motor operating voltage and related operating parameters. The switch-on current pulse duration (TON) can be adjusted longer or shorter, as a function of operating experience.

Abstract: A method is disclosed for producing a mini-fan that includes a fan wheel equipped with fan blades (80) and, in order to drive said fan wheel (64), an electric drive motor (61). The latter has an internal stator (90) and an external rotor (62). The latter has a supporting part (64) made of plastic and connected to a shaft (60), which part is implemented integrally with the fan blades (80). The external rotor (62) furthermore has at least one permanent magnet (72; 72?) having hard ferromagnetic particles (74). The plastic supporting part (64) is connected by plastic injection molding to the shaft (60), and by two-component injection molding to a plastic in which the hard ferromagnetic particles (74) of the rotor permanent magnet (72; 72?) are arranged, so that at least a portion of the transition zone (76) between the supporting part (64) and rotor permanent magnet (72; 72?) is formed by a materially engaging connection. The pre-assembled external rotor (62), thus formed, is inserted into the mini-fan.

Abstract: An electronically commutated external-rotor motor has an internal stator (20), having a stator lamination stack (64) and a winding arrangement (66) associated therewith. the latter, as well as a central opening (149) of the stator lamination stack (64), in which opening a bearing tube (56) is arranged. The motor further has a permanent-magnet external rotor (26) separated from the stator lamination stack (64) by a magnetically effective air gap (99), which rotor has a shaft (42) that is journalled in the bearing tube (56). First and second rolling bearings (48, 50) are arranged at a distance from one another in the bearing tube (56). The first rolling bearing (48), adjacent the rotor hub, is a floating bearing, while the second rolling bearing (50), near the shaft end (70) remote from the hub (40), is braced with one side against a shoulder (82) provided in the bearing tube (56).