Abstract:
The invention concerns a Stirling cooling arrangement (1) with a driving unit (2) that generates periodically changing gas pressures, and a displacer unit (4) connected to the driving unit (2) and comprising a displacer (15) that is movable in a displacer housing (6) along a displacer axis (16). It is endeavoured to achieve a good efficiency. For this purpose, the displacer (15) comprises a body (20) of a plastic material that is provided with a metal ring (22), whose outer diameter is larger than the outer diameter of the body (20).
Abstract:
The invention concerns a Stirling cooling arrangement (1) with a driving unit (2) that generates periodically changing gas pressures, and a displacer unit (4) that is connected to the driving unit (2) and comprises a displacer (11) that is movable in a displacer housing (6) along a displacer axis (29), said displacer (11) having differently large pressure application surfaces on its two end faces. It is endeavoured to achieve a good efficiency. For this purpose, the inside of the displacer (11) accommodates a sealing pipe (24) that extends from an end face and comprises at least one sealing element (25) that is connected to the displacer housing (6) and fills the cross-section of the sealing pipe (24).
Abstract:
The invention relates to a Stirling cooling arrangement (1) with a driving unit (2) and a displacer arrangement (3, 4) that is connected to the driving unit (2) via a gas pipe (5). It is endeavoured to achieve a smooth operation of such a cooling arrangement. For this purpose, the displacer arrangement (3, 4) comprises at least two displacers (15), whose movements are adapted to each other.
Abstract:
Die Erfindung betrifft einen elektrischen Line-Start Motor mit einem Stator und einem Kurzschlussläufer (1) zur Drehung um eine Mittelachse. Der Läufer (1) hat eine Käfigwicklung (4), in der Strom durch entsprechende Wicklungen des Stators induziert wird, und einen Satz von Permanentmagneten (11). Um die Magneten (11) vor übermäßiger Wärme zu schützen, hat der Läufer (1) thermische Sperren (12), z.B. in der Form von Hohlräumen zwischen der Käfigwicklung (4) des Läufers (1) und den Magneten (11). Auf Grund der thermischen Sperren (12) wird die thermische Leitfähigkeit in einem Pfad zwischen den Wicklungen (4) und den Magneten (11) reduziert und die Magneten (11) werden geschützt.
Abstract:
Die Erfindung betrifft einen Rotor für einen Elektromotor, insbesondere einen Line-Start-Elektromotor, mit in axialer Richtung verlaufenden Aufnahmeräumen (20 bis 25) für Leiterstäbe und mit in axialer Richtung verlaufenden Aufnahmeräumen (4 bis 7) für Permanentmagnete, die gekrümmt ausgebildet und angeordnet sind. Um das Anlaufdrehmoment zu steigern, weisen die Aufnahmeräume (4 bis 7) für Permanentmagnete und/oder die Permanentmagnete selbst unterschiedlicher Krümmungsradien auf.
Abstract:
A refrigerant compressor (1) is disclosed, having an electric motor (3), the stator (9) of which has windings with winding heads (13, 14) and the rotor (8) of which drives a compressor (4) which comprises a compressor block (10) having an axially projecting bearing part (11) for a rotor shaft (5), one winding head (14) extending in the direction of the compressor block (10) and electricalinsulation being provided between the winding head (14) and the compressor block (10). With the same overall size, it is desirable to be able to improve the efficiency of such a refrigerant compressor without markedly increasing the effort involved in assembly. To that end, the insulation is formed by a foil (17) which is pushed with a substantially centrally arranged opening (20) onto th bearing part (11).
Abstract:
A refrigerant compressor is disclosed, having a piston (2) which is movable back and forth in a cylinder (3), the cylinder (3) having at its end wall (5) a discharge opening (6') closable by a discharge valve (7'), into which opening a projection (16') on the corresponding end face of the piston (2) projects when the piston is located in the region of its end position. It is desirable to increase the efficiency of such a compressor. For that purpose, the projection (16') is of asymmetrical construction in cross section.
Abstract:
The invention provides an AC single phase induction motor with a main winding and an auxiliary winding. The motor comprises a switch arranged to short circuit a run capacitor. To provide variable run capacitance, the motor further comprises an additional run capacitor inserted serially with respect to the other run capacitor, and the switch short circuits one of the capacitors.
Abstract:
The invention concerns a displacer unit (3) of a Stirling cooling arrangement (1) with a housing (20), a displacer (10) that is arranged to reciprocate in a cylinder (11) between a cold side (12) and a hot side (13) of the displacer unit (3), and a regenerator (16) arranged between the cold side (12) and the hot side (13), a gas being permitted to flow through said regenerator (16) on its way from the cold side (12) to the hot side (13) and back. It is endeavoured to permit defrosting in a simple manner. For this purpose, at least one bypass conduit (23) is arranged in parallel to the regenerator (16), an opening or closing of said bypass conduit (23) being con- trolled by a control unit (22).
Abstract:
Stirling cooling arrangement with a driving unit (2) having a housing (47-49) and at least one piston (5, 6) that is driven by a linear motor (8, 9) along a piston axis (7) in a cylinder (29), and a displacer unit (3) that is connected to the driving unit (2) via a gas-carrying connection (24) and comprises at least one displacer (14) that is movable in a displacer housing (15) along a displacer axis (16), the linear motor (8, 9) comprising an armature (10, 11) that is connected to the piston (5, 6) and arranged between an inner stator (31 ) and an outer stator (32), and a coil arrangement (35, 35'). It is endeavoured to achieve a good efficiency. For this purpose, in the radial direction the coil arrangement (35, 35') is arranged inside the armature (10, 11).