Abstract: The invention relates to a pump (10), having a pump head (12), which has a pump chamber (11), and having an electric motor (14), which drives the pump head (12) and has a stator (40) and a rotor (38), the rotor (38) being connected to the pump head (12) and being disposed in a rotor chamber (82) open toward the pump chamber (11).

Abstract: In an electronically commutated direct-current motor having a stator (14) with a multi-phase stator winding (15) and a housing (11) receiving the stator (14), having a commutation device (21), disposed in the housing (11) for consistent connection of the winding phases to a direct voltage from the electrical system, which has a plurality of semiconductor switches (22) and an electronic control unit (26), received by a printed circuit board (24), for triggering the semiconductor switches (22), and having a connection plug (13) for delivering the direct voltage from the electrical system, in order to provide a more-robust embodiment of the commutation device (21), all the electronic components of the commutation device (21) that carry power currents, such as the connection plug (13), semiconductor switches (22), electrolyte capacitor (25), and so forth, are contacted on a stamped grid (23), with which the electrical connection with the stator winding (15) and the printed circuit board (24) is established.

Abstract: The invention concerns a valve for controlling flow volumes in the heating and cooling system of a motor vehicle comprising a valve housing (12, 112, 212) and a valve chamber (14, 114, 214) from which at least one intake passage (16, 116, 216) and at least one outlet passage (18, 118, 218) branch off, and comprising at least one valve flap (28, 128, 228) that is arranged in the valve chamber (14, 114, 214) and is rotatable around the axis of a shaft (34, 134, 234), which said valve flap has a valve linkage (30, 130, 230) and a valve sealing head (32, 132, 232) that interacts with at least one valve seat (22, 122, 222) of the valve chamber (14, 114, 214).

Abstract: An electronically commutatable motor is described, the stator field windings of which can be connected to a commutation frequency having a DC supply voltage to generate a rotating field for the permanent magnet rotor and can be disconnected from it, the field windings being switchable via semiconductor output stages which can be activated via control signals with the commutation frequency of a control unit and whose operating conditions change as a function of a specified or specifiable setpoint. The disadvantages of motors with pulse-width-modulated control of the field windings can be avoided with simplified motor control in that the DC supply voltage is supplied to a DC transformer whose output voltage for the semiconductor output stages with the field windings changes as a function of the setpoint and that the control unit fully activates the semiconductor output stages continuously with unclocked control signals with the commutation frequency independently of the setpoint.