Robert Boschgmbh

Volker Bosch

Rainer Glauning

Stefan Roepke

Hans-Joachim Baur

Arnim Fiebig

Kurt Reutlinger

Bernd Wirnitzer

Guenther Lohr

Harald Krondorfer

Uwe Skultety-Betz

Bjoern Haase

Peter Wolf

Joerg Stierle

Guenter Lohr

Kai Renz

Clemens Schulte

Ulrich Peter

A system for operating an electric machine includes: a rotor position sensor to provide a rotor position indication as a function of a rotor position angular range which indicates the position of a rotor of the electric machine; a control unit designed to associate in each case a commutation angular range, which indicates a certain control state for the stator coils, with one or more of the rotor position indications, so that a change in the commutation angular range is triggered by a change in the rotor position indication, and to change an association scheme of the associations between the rotor position indications and the respective commutation ranges as a function of a predefined rotational direction indication which indicates the desired rotational direction.

Motor system having an electronically commutated electric machine

An equipment system includes a battery unit () having a monitoring circuit (), which detects at least one operating parameter of the battery unit () and furnishes a control signal, dependent on the operating parameter, for switching means (). The switching means control the charging and discharging process of the battery unit () and are located in the electrical device () and in the charger (), respectively. From the battery unit (), the control signal is transmitted to the switching means () in the electrical device () and in the charger (), respectively. By this provision of shifting the switching means () out of the battery unit () into the electrical device () and into the charger (), respectively, the heat development in the battery unit () and also its structure size are reduced.

Equipment system comprising a battery-operated electrical device, a rechargeable battery unit, and a battery charger

The invention relates to an electrical machine and to a method for the operation thereof, particularly as a drive motor for an electrical tool or as starter generator for a motor vehicle. The electrical machine includes a rotor excited by a permanent magnet and a stator carrying a multi-phase winding, and operates in a voltage-controlled, lower rotational speed range via a transformer on a DC voltage source. The electrical machine can also be operated in a higher rotational speed range by field weakening, and the structure of the machine can be changed by reducing the flux linkage between the rotor and the stator in order to weaken the field. Preferably, the change to the structure of the machine is carried out by turning off winding parts or by switching them between series and parallel connections.

Electrical machine

The invention relates to a hand-guided electric tool having a motor and a pulse width modulator for generating a pulse width modulated signal for operating the motor. A unit is provided for reducing the EMC interferences emitted by the electric tool.

Electric tool

A distance measuring device () in the form of a hand-held unit includes a path () for a measurement signal, an adjustable signaling means () for changing the measurement signal, and a drive unit () for adjusting the signaling means (). The drive unit is equipped with a static unit () and a drive element () that the static unit () is able to directly drive to execute a movement in relation to the static unit (). The drive element () has the capacity to be driven into a rotation in relation to the static unit ().

Hand-held distance measuring device with static unit and drive element

A hand-guided or stationary power tool has a drive unit having a motor that includes a rotor having a permanent magnet and a stator and has a motor control designed to trigger the motor in a first rotational speed range according to a voltage-controlled mode and to trigger the motor in a second rotational speed range following the first rotational speed range in the direction of a higher rotational speed according to a field-weakening operation.

Hand-guided or stationary power tool having a drive unit

A method of producing a stator with a rotary current winding, having a first and second face end. On the face end, at least one shaped part with struts for winding guidance is provided. A brushless direct current machine with a stator, a shaped part for winding guidance for a stator with a rotary current winding, and a winding method for producing a stator with a rotary current winding are also disclosed.

Stator with a rotary current winding, brushless direct current machine having a stator, shaped part for winding guidance for a stator with a rotary current winding, and winding method for producing a stator with a rotary current winding

A method for starting a sensorless, electronically commutatable direct current motor, having a permanent-magnetically excited rotor in which the stator carries a three-phase stator winding, whose regulated supply of current from a direct voltage source is already made possible from the standstill state. To that end, by the control device used, at rotor standstill and at the onset of the startup operation in the range below a minimum value of the rotor rpm, first the position of the rotor is ascertained, and then via the switching device, a regulated initial supply of current to the phase windings of the stator is generated, while after the predetermined minimum value of the rotor rpm is attained, the control device receives position signals as rotor position signals for a self-commutation of the motor, which signals are derived directly from the third and/or further odd-numbered harmonics of the phase voltages, and from these position signals furnishes control signals to the switching device for supplying current to the phase windings in normal operation.

Method for starting a sensorless, electronically commutatable direct current motor

The invention is based on a rechargeable battery-operated hand machine tool () having an electric drive motor () accommodated in a housing () and powered by a rechargeable battery (), which motor is used to drive a tool (), and having an actuating means () for switching the drive motor () on and off. A mechanism () is provided, which is capable of reducing the discharging of the battery () during operation.

Rechargeable battery-operated hand machine tool

A rotary speed limiting device for an electric motor has a current detecting device for detecting a motor current of the electric motor, a nominal value setting for adjusting a torque, a control and/or regulating device which limits the motor current to a maximum value depending on the nominal value setting, a rotary speed detecting device for detecting a rotary speed of the electric motor, the control and/or regulating device determining a maximum value of the motor current depending on the rotary speed determined by the rotary speed detecting device.

Torque limiting device for an electric motor

A monitoring device for an electrical machining tool, in particular for temperature monitoring with an accumulator-driven machine, includes a switch element () for separating an electrical consumer () from a current supply device (). For detection of a first operating parameter (T) of the consumer () and/or the current supply device (), a first sensor () is provided, whereby the first sensor () is connected with a display unit and/or with the control input of the switch element, in order to control the switching process as a function of the first operating parameter (T). Furthermore, the present invention relates to an electrical machining tool as well as a current supply device with the inventive monitoring device and a corresponding method of operation.

Monitoring device, electrical machine tool, current supply device, and associated method of operation

A battery unit including a battery () is equipped with a monitoring circuit () for detecting and evaluating operating variables related to charge state of the battery (). So that energy is not drawn from the battery () by its own monitoring circuit () when an external load () powered by the battery unit is shut off, the supply of electrical power to the monitoring circuit () in the battery unit is disconnected, either immediately or after a certain time delay, when the load () is shut off. This slows the discharge of the battery () when it is not supplying electrical to the load ().

Method and apparatus for slowing the discharge process of a battery

The electric motor with permanent-magnet excitation has a stator ( ), a rotor ( ) supported inside the stator and adjacent permanent magnets ( ) of opposite polarity arranged next to each other on a rotor surface facing the stator. The rotor ( ) has cavities ( ) arranged within a rotor interior and indentations ( ) in the rotor surface, which are arranged so that radially oriented magnetic flux lines are not interrupted by the cavities and indentations, but magnetic flux lines oriented tangentially to the rotor surface are interrupted by the cavities and indentations so that a magnetic short circuit is formed. These indentations and cavities reduce the rotor heat capacity so that a layer of a magnetic material that forms the permanent magnets ( ) can be sprayed onto the rotor surface.

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Stuttgart, Germany

Volker Bosch