Abstract: The invention relates to a setting device for a ventilation flap (12, 12a, 2b) in an air duct, particularly in a heating and ventilation system of an automobile, with an electric motor (2) executing setting movements and with a control unit (3) for the electric motor (2). In order to minimize the outlay in terms of assembly and the replacement parts to be kept available, there is provision for designing the electric motor (2) as a stepping motor activated by output signals from a control unit (3) adjacent to this stepping motor, and the control unit (3) has encoding inputs (K1, K2) for selecting the direction of rotation and/or the rotary angle.

Abstract: A device for driving a positioning element via a stepping motor is described. This device makes it possible to continue operating the stepping motor in conjunction with its use as an encoder during phases without electrical control, so that the position last reached under electrical control, with a zero-current change in the position, possibly as a result of manual operation of the positioning element that is rotationally or frictionally coupled with the motor rotor, is constantly updated so that the control electronics is informed at all times of the actual position from which the stepping motor is to be controlled electrically to assume a new position. The device not only permits eliminating indexing devices that are subject to wear, but also allows automatic return, for example of a positioning element to its previous starting position after it has been shifted or adjusted from by an outside influence.

Abstract: The connection of the circuit board (7) of the appliance to connector blocks (10) is obtained by inserting and soldering holders (11) having connecting terminals (16) to the circuit board, connector blocks (10) being loosely attached to said connecting terminals (16). The mutual mechanical and electric connection is obtained by inserting the assembly into a case which secures the connector blocks to the circuit board, on one hand, and by fastening clamps which establish a connection of the connecting terminals (16) to connected conductors. The assembly of the appliance is particularly rational since the holders (11) with the connecting terminals are placed on the circuit board together with the remaining, non-represented components and are soldered thereto in common, the connector blocks (10) being simply slid on. The assembly is thus well suited for automation. The connector blocks abut to the edges of the circuit board (7), thus allowing a good space utilization and a compact construction.

Abstract: A housing for a control apparatus is made of a synthetic material and includes a lower part and a cover. In the lower part are provided an upper printed board and one or more lower printed boards. Additional modules can be connected with the upper printed board by means of connectors. The lower printed boards are inserted on supporting ribs and between guiding ribs under the upper printed board and in the inserted condition they are exchangeably connected with a printed bus. At the bottom of the lower part of the housing is fastened a screening sheet. The housing of the apparatus can be realized at low costs and due to the screening sheet, a sufficient screening can be guaranteed. The two or three stages permit a compact construction of the apparatus and notwithstanding, all printed boards are easily accessible, in that the lower printed boards are to be removed without any dismounting of the upper printed board.

Abstract: A central carrier, which is constructed as a stamped part or a metallized plastic part is used for the mutual electrical and mechanical connection of the other components of the system. A plastic material and molded part is sprayed around the carrier. In turn, this molded part holds together the carrier which, after the plastic was sprayed around it, was divided into electrically insulated conductor parts, and which molded part forms housing walls as well as a plug casing.

Abstract: A valve head is actuated by a resetting spring, on one hand, and on the other hand, by the rotor of a motor acting upon a screw and nut assembly. The rotor of the motor is axially coupled to a plunger of an electromagnet. Said valve head, the rotor of the motor, and said plunger of said electromagnet are thus jointly displaceable in the axial direction. In the resting position, or in the case of a power breakdown, said valve is closed by a spring, and said rotor as well as said plunger of said de-energized electromagnet are axially displaced. In the working position, said plunger is attracted and maintained in its working position by a pole piece of said electromagnet, and said rotor is also maintained in its working position in order to regulate the position of said valve head by means of said screw and nut assembly.

Abstract: Current pulses are conducted through an inductance by means of a switching transistor. The switching transistor is controlled by means of an amplifier and pulse shaper circuit in such a manner that a constant average direct current flows in a closed loop comprising said inductance and a recovery diode, resulting in a regulated, constant output voltage across two Zener diodes. This allows a particularly effective operation with relatively low power losses in said switching transistor as compared to the utility current at the output terminals, and the circuit operates reliably in a wide range of operating voltages.

Abstract: Small-size motors, particularly vehicle step motors in a system used to adjust vehicle parts, are connected directly with a housing in which an assigned electronic control system is housed. A bus supplies each of the motors or its associated electronic control system with adjusting commands and energy. The housings in which the electronic control systems are housed, are closed off tightly with respect to dust and dirt but not with respect to vapor, so that moisture can diffuse out of these housings. This arrangement permits a simple and operationally reliable construction.

Abstract: A headlamp positioning device having a stepping motor and a sensor for detecting loss of steps in the motor. An electronic controller operating in open-loop with the motor automatically reinitiates the positioning upon the detection of loss of steps due to an impediment during the positioning of the headlamps.

Abstract: By means of a potentiometer an analog voltage Ua is applied to an A/D converter. A reference voltage Uref is also applied to the A/D converter and the same produces a digital output information corresponding to the ratio between the analog voltage and the reference voltage. This digital output information of the A/D converter is periodically counted by a preselection counter and this counter delivers an output pulse whenever it has counted the value stored in the A/D converter. The potentiometer, A/D converter and counter form a time base of which the time unit depends on the position of the potentiometer only and not on fluctuations of the operating voltage. Due to the continuous periodic sampling and storing of the digital output information of the A/D converter, high accuracy of the time basis is obtained since a statistic mean value of the digital value is repeatedly counted.

Abstract: A rotor of T-shaped section lies on the motor shaft. The rotor comprises two external symmetrical collars which comprise radial magnetized permanent magnetic poles. Two identical stator parts, symmetrically arranged in the motor comprise external pole teeth lying external resp. internal of each of one of the collars of the motor. This gives rise to a radial flow of magnetic flux in the external lying, radially magnetized permanent magnetic poles of the rotor which leads to a high torque and efficiency. The construction of the motor is simple. Relatively thin material may be used. Relatively high number of poles are possible due to the fact that the effective poles, of the stator and of the rotor lie at the outside.

Abstract: In an apparatus and method for preventing instability of a stepper motor operated by a plurality of alternating currents of different respective phases and controlled by a sequence of control pulses, the control pulses defining an angular parameter of the stepper motor, the steps include determining the sum of the phase currents, transforming the sum of the phase currents into a voltage fluctuating about an average value, determining the average voltage, and thereafter feeding back the fluctuating voltage so as to angle-modulate said control pulses.

Abstract: Circuitry for measuring the torque of a stepping motor is disclosed. The circuitry is based on the fact that the decay time of the current flowing through the stator coils is a function of the torque of the stepping motor.

Abstract: A simple mechanical counting device is disclosed. The counting device includes a simple zero reset mechanism which enables the counter to be easily reset to zero by the use of a finger of the human hand.

Abstract: A multipole key switch comprises switching chambers disposed next to each other are each provided with a movable contact bridge, which shortens a pair of contact fingers in each case in the turned on condition. Contact supports for supporting the contact bridges are formed at a cross-web of an actuating arm. Each switching chamber is provided with a restoring spring. The force of only two restoring springs can bring the key switch into its switched-off position. In order to prevent a sideways canting or clamping of the actuating ram, it is provided with two ribs, with the aid of which it is guided in a guide track.

Abstract: A rotational restriction lock is formed as a one-piece restricting element which is resiliently mounted on a rotor shaft and has a hub which is always resiliently driven in rotation by the rotor throughout a small angle, spring arms which transmit the rotary movement, and movable rotation restricting elements to which the rotary movement is transmitted and the ends of which prevent the rotor from rotation in an undesired direction, but allow the rotation of the rotor in a desired direction. Adjustable abutments are provided for selecting a permissible angle of rotation of the hub.

Abstract: A document is disclosed, which contains information invisible to the naked eye, but which information can be made visible by a simple method. Said information is represented by markings on the document, which markings comprise a first color at least partially opaque to at least part of the invisible light spectrum, and a second color which serves to conceal said first color in the visible spectrum, but which second color is itself transparent to said part of the invisible light spectrum.

Abstract: Two identical toggle springs of a snap action switch are inserted in the same knife-edged bearings and are spaced apart in the region of their clamping locations and are activated by the same plunger. There are two control arms connected to the toggle springs each having a movable contact. The relative distance between the control arms is limited by a lost motion buffer. Stationary contacts are positioned above and below the movable contacts. The control arms are actuated by the plunger and move in the same direction as the plunger establishing contact between one of the movable contacts of the control arms and one of the stationary contacts.

Abstract: A miniature electric motor having substantially identical stator halves which are connected together by lugs axially interengaging on the circumference of the stator.The lugs of the stator halves resiliently engage in pairs on a common plane between ribs formed on a plastics material ring which is located inside the stator halves and which also forms an outer protective casing for the coils and the rotor parts of the motor. The lugs may be slotted at their free ends to provide resilient shanks.

Abstract: A miniature synchronous motor having a bell-shaped rotor and a damping body, freely mounted, but non-rotatable on the rotor shaft. The damping body being urged, at least substantially in a radial direction by a spring, the force of which also acts substantially equally for both bearings of the motor so as to reduce noise during operation.