摘要:
A fan (100) has a fan housing (110). The latter has an air entrance opening (120) and an air exit opening (130). It further has a swivel joint arrangement (180) having at least one swivel joint (145, 147, 155, 157, 165, 167, 175, 177) that is arranged on a joint carrier (188; 188′); at least one non-return flap (140, 150, 160, 170) that is journaled rotatably by means of the at least one swivel joint (145, 147, 155, 157, 165, 167, 175, 177) and, in its closed position, at least partly closes off the air exit opening (130); and at least one elastic return member (142, 152, 162, 172) that is associated with the at least one non-return flap (140, 150, 160, 170) and urges it toward its closed position.
摘要:
An internal rotor motor, in particular an electronically commutated internal rotor motor, has a multi-pole stator (28) and a rotor lamination stack (37; 52, 54, 56) mounted rotatably relative to said stator; furthermore a central bore is provided in the rotor lamination stack, the rotor lamination stack comprising individual laminations (41) whose respective central openings (47) comprise radially inwardly projecting first portions or tabs (50) into which a rotor shaft (18) is press-fitted, and said central openings (47) comprise, in angular sectors between the first portions (50), second portions (51) that, in the assembled state, are spaced away from the outside of the shaft (18), at least some (axially central) ones of the individual laminations (41) of the rotor lamination stack (52) being arranged with an angular offset from one another.
摘要:
A novel electric motor rotor structure, particularly desirable for use with brittle rare-earth-magnets, offers improved resistance to rattling and axial shifting. This is achieved by forming the rotor with an annular central yoke connecting to a plurality of pole shoes along the periphery of the rotor and defining a magnet-receiving recess or pocket 160 between each pole shoe and the central yoke. Spaced circumferentially between adjacent magnets 38 are regions 146 of reduced magnetic conductivity, which include relatively thin metallic holding segments, which connect adjacent pole shoes to each other and to the central yoke. During manufacturing, tools are applied to upset or crimp the holding segments, and thereby form spring elements, to hold the magnets in stable positions and resist any tendency of the magnets to rattle or axially shift during motor operation. One obtains the same power level from a smaller, and therefore lighter, motor than was previously possible.
摘要:
An electronically commutated motor (ECM) often employs a Hall sensor for reliable operation. Even when a Hall sensor is omitted from a motor having a plurality of stator winding phases (24, 26) and a permanent-magnet rotor (22), one can reliably detect direction of rotation of the rotor by the steps of: (a) differentiating a voltage profile obtained by sampling either (1) induced voltage in a presently currentless phase winding or (2) voltage drop at a transistor, through which current is flowing to a presently energized phase winding, and (b) using such a differentiated signal (du—24″/dt, du—26″/dt) to control current flow in an associated phase winding. In this manner, one obtains reliable commutation, even if the motor is spatially separated from its commutation electronics.
摘要:
A fan (20) has: a motor having a stator (40) and having a rotor (60) with at least one fan blade; at least one air inlet having an air entrance opening (102) for the inlet of air; at least one air outlet having an air exit opening (32) for the outlet of air; a circuit board (80) having at least one recess, which circuit board (80) is arranged in the region of the air inlet in such a way that air can enter the fan (20) through the recess, motor electronics (88) being arranged on the circuit board (80). In a preferred embodiment, a Negative Temperature Coefficient (NTC) resistor (84) is surface-mounted on a PC board portion (83) extending into the air passage, to thereby sense air temperature. This facilitates compact, automated construction.
摘要:
An electronically commutated motor (ECM) often employs a Hall sensor for reliable operation. Even when a Hall sensor is omitted from a motor having a plurality of stator winding phases (24, 26) and a permanent-magnet rotor (22), one can reliably detect direction of rotation of the rotor by the steps of: (a) differentiating a voltage profile obtained by sampling either (1) induced voltage in a presently currentless phase winding or (2) voltage drop at a transistor, through which current is flowing to a presently energized phase winding, and (b) using such a differentiated signal (du—24″/dt, du—26″/dt) to control current flow in an associated phase winding. In this manner, one obtains reliable commutation, even if the motor is spatially separated from its commutation electronics.
摘要:
A method of making a fan having one or more dust-resistant surfaces comprises the steps of: providing (S50) an open mold for injection-molding purposes, having a cavity (43) corresponding to the desired configuration of fan components to be formed; wetting (S52) the surface of the cavity (43) with a mixture (24) of nanoparticles (19) and a solvent carrier; evaporating (S54) said solvent carrier, thereby depositing said nanoparticles on the wall of the cavity (43); closing (S56) the injection mold (10, 12); injecting (S58) thermoplastic (42) into the cavity (43); permitting the thermoplastic to harden, thereby binding the nanoparticles into the surface of the thus-created component(s), and removing (S60) the completed component(s) from the mold, for subsequent assembly as part of a fan.
摘要:
An arrangement for pumping fluids has an electronically commutated external-rotor motor. The latter has a stator arranged on a stator carrier and a rotor joined to a first permanent magnet, which rotor is rotatably journaled, in a bearing tube, with respect to the stator. This bearing tube is arranged, at least partly, radially inside the stator carrier. The first permanent magnet is arranged in an annular interstice between the stator carrier and the bearing tube. A fluid pump has a pump wheel arranged rotatably inside a pump housing, which wheel is joined to a second permanent magnet, a liquid-tight but magnetically transparent partition being provided between the first permanent magnet and the second permanent magnet. This keeps fluid away from the motor wiring. The first permanent magnet forms, by coaction with the second permanent magnet, a magnetic coupling to the fluid pump, which magnetic coupling automatically produces a rotation of the pump wheel as a result of rotation of the motor rotor.
摘要:
An improved fan arrangement features a radial or diagonal fan (370) with which a direct current motor (32) is associated as its drive motor, further comprising a digital control element (23, 24) which executes a program, for controlling the current flowing through the direct current motor (32), which program is so configured that it applies a substantially constant current in the motor (32) in the working rotation speed range of the fan.
摘要:
A fan has an air conveying conduit (16) and a fan wheel (22) arranged therein, which wheel is rotatable about a central axis (25) and is formed with a central hub (20; 120) having an outer periphery (27) on which fan blades (26) are mounted. These extend with their radially outer rims (40) as far as a surface (17) that is substantially coaxial with the central axis (25) and delimits the air conveying conduit (16) externally. The blades (26) have a profile similar to an airfoil profile. A flow element (42) is provided along the radial outer edge (40) of a fan blade and serves as an obstacle to a compensating flow proceeding around that radial outer edge (40) from the delivery side to the intake side, and likewise has, in cross section, an airfoil profile.Adjacent the front edge (28) and rear edge (36) of a blade (26), it has substantially the same outline as the adjacent part of the associated blade (26), and in a middle region (48) between the front and back edge is wider, by an approximately constant amount, than the adjacent part of the blade (26).