Robert Boschgmbh

Wolfgang Krauth

Christoph Heier

Gerhard Knecht

Wolfgang Schwenk

Tilo Koenig

Joerg Sutter

Matthias Henschel

Andreas Schiel

Eike Hermann Timm

Christof Bernauer

Gerd Lentz

Claude Berling

Torsten Wilharm

Volker Lurk

Gerhard Decker

Johannes Rehagen

Juri Hartmann

Volker Hofacker

Theo Doll

The invention relates to a scroll compressor () and to a method for operating the scroll compressor (). The scroll compressor () has a stator (), an orbiter () which can be moved about an orbiter axis () relative to the stator (), and a coupling device (). The stator () and the orbiter () engage into each other and at least partly delimit at least one working area () for compressing a fluid () which can be filled into the working area (). The coupling device () has a first coupling unit () which is arranged on the stator () and a second coupling unit () which is arranged on the orbiter () opposite the first coupling unit (), wherein the first coupling unit () is magnetically coupled to the second coupling unit (), and the second coupling unit () introduces a coupling torque (M) which acts about the orbiter axis () into the orbiter ().

Scroll compressor and method for operating the scroll compressor

The invention relates to an electric machine, comprising a rotor () and a stator (), wherein the rotor () and/or the stator () comprise at least one laminated core () having a substantially rectangular cross-section, wherein the laminated core () comprises a sheet metal strip (), wherein the sheet metal strip () is wound in a coil shape.

Electrical machine

The invention relates to a DC motorcomprising a cylindrical coil carriercomprising wire guide elementfor guiding a first winding wireand a second winding wireof an air-gap winding on both side end sections, wherein the first winding wireand the second winding wireeach comprise rectangular winding segments, wherein the rectangular winding segmentsof the second winding wireare disposed overlapping on the cylindrical coil carrierand the wire guide elementsare designed for guiding the first winding wireand the second winding wirepast each other.

DC motor having a unique winding structure

The invention relates to a method for positional recognition of a rotor of an electronically commutated electric machine, in particular an electric motor, in which a zero crossover of a voltage induced in a coil section of the rotor or stator is used for positional recognition. According to the invention, to determine the zero crossover the coil section is briefly powered down. A rotor/stator is used, comprising at least two coil sections, one of which has a lower inductance relative to the other one, and preferably only the coil section with the lower inductance is used for the positional recognition.

Positional recognition using BEMF zero crossover recognition of a rotor of an electronically commutated electric machine with two coil sections of different inductances

The invention relates to a stator () for an electric drive motor having a number of stator teeth separated by grooves, wherein the stator teeth are wound by a multi-strand winding, and wherein one strand comprises several coils (), and wherein individual coils () each comprise multiple stator teeth, and preferably multiple stator teeth are combined at the height of their tooth necks into a collective stator tooth () having a tooth base () and multiple tooth heads (), characterized in that two stator teeth each are combined into a collective stator tooth ().

Stator for an electric drive motor

An electronically commutatable motor having field windings activatable in sequence with a commutation frequency via semiconductor output stages using control signals connectable and disconnectable from a direct voltage supply, the control signals being clocked using pulse width modulation. Noise generation from connection and disconnection of the current applied to field windings is minimized by flattening of the rising and/or falling edges of the current in the field windings. The pulse width ratio increases in the rising edges of the control signals from a low initial value to an operating value assigned to the setpoint as a function of a selected setpoint for the motor speed or output, and, in the falling edges of the control signals, the pulse width ratio starts from the existing operating value and is reduced to a lower final turn-off value as a function of the existing actual value of the speed or the output of the motor.

Method of controlling an electronically commutatable motor

A method is for starting a sensorless and brushless direct current motor, the stator windings of which are supplied with power from a multiphase converter circuit. For starting the motor, it is first rotated into a defined starting position in an alignment operation through simultaneous energization of at least two phases. Then in a second phase, an energization state of the stator windings which is in the desired direction of rotation and provides sufficient torque is initiated, whereupon then the additional energization states of the corresponding phases follow cyclically, and the rotor is rotated in synchronization with the applied stator rotational field. The motor may be used in a motor vehicle and supplied with the battery voltage at the input terminals. In an example embodiment, the current supplied in the alignment is adjusted according to the battery voltage, and in addition, it is increased according to a specified waveform. This ensures reliable and rapid rotation without overshooting into the starting position.

Method for starting a sensor- and brushless d.c. motor

A fluid pump, in particular for the coolant and heating system of a motor vehicle, has a stator ( ) of claw pole construction and a rotor ( ), separated from the stator ( ) by a pipe ( ), which is immersed in the coolant and forms a vane wheel. The rotor ( ) is disposed radially inside the stator ( ).

Liquid pump with a claw pole stator

A device and method for driving a polyphase DC motor, in which a phase selector circuit, in each case, selects only one phase, which is fed to a commutation detection circuit. After each commutation detected by a commutation detection circuit, as a result of a pulse of constant duration generated by a monoflop, the phase discriminator circuit and, as a consequence, the commutation logic are advanced in a fixed and preestablished sequence. This occurs irrespective of the rotation direction of the motor using the sequential logic device embodied by the commutation logic. When the motor rotates in the preferred direction, constant current-flow angles of 120&deg; are achieved for each phase. When the motor rotates in the reverse direction, markedly varying current-flow angles of the individual phases are generated, and these varying current-flow angles, as a function of the course of the specifically corresponding voltages induced in the individual phases, result in a counter-torque. This counter-torque causes a braking of the motor to a standstill and a reliable startup in the preferred direction. The exemplary electronics, in this context, do not distinguish between the two rotation directions so that no additional electronics expense is required to reliably startup from a reverse rotation condition.

Method and device for controlling an electronically commutated polyphase D.C. motor

An electronically commutated motor includes a stator carrying a plurality of winding strands and a rotor in which the individual winding strands are controlled via power amplifiers in staggered periods of time, the periods being subdivided into control time and idle time. To reduce the power loss in the power amplifiers and to increase the efficiency in the range of high currents, that the control times are subdivided into an initial time segment and a final time segment. At low motor currents pulsing occurs only in the initial or final time segments in pulse width modulation, while at high currents complete switching through takes place in the initial time segments and additionally in the final time segment for a more or less long period of time or in the final time segments and additionally in the initial time segments for a more or less long period of time.

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Achern-Sasbachried, Germany

Wolfgang Krauth