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Hilti Akitengesellschaft

Vilmos Trorok

Walter Wissmach

Roland Schaer

Erwin Manschitz

Ferdinand Kristen

Rudolf Bauer

Vilmos T&ouml;r&ouml;k

Christoph Kink

Holger Cecchin

Vilmos Torok

Hans-Werner Bongers-Ambrosius

Stefan Miescher

Wolfgang Millauer

David Hruza

Christian Daubner

Martin Mayr

Hubert Daxenberger

Hans-Jürgen Pfisterer

Alexander Nachbaur

Ernst Klein

Christian Augustin

Xiaodong Zhang

Hans-Juergen Pfisterer

Wolfgang Zwerenz

Vilmos Török

Hans-Jürgen Horst Georg Pfisterer

Christoph Josef Kink

An electric drive unit for an electric handheld power tool, having an electric motor with a stator winding and a rotor winding, an actuating circuit for actuating the electric motor and a connection unit for coupling an energy source for driving the electric motor, wherein the stator winding is connected via a first node to a stator-side first half-bridge including a first semiconductor component and a second semiconductor component and is connected via a second node to the rotor winding, wherein the rotor winding is connected to a third node which is connected via a conductive component to the connection unit, and wherein the actuating circuit includes a third semiconductor component which is connected via the second node to the rotor winding and the stator winding and which is connected via a fourth node directly to the connection unit.

Electric drive unit for an electric handheld power tool and electric handheld power tool having an electric drive unit

A handheld power tool has a tool socket () to hold a tool () along a working axis (), a motor () and a slip clutch () having a number of blocking elements. A sensor () serves to record a measured signal () as the measure of vibrations inside the handheld power tool (). A band-pass filter () has a pass range in which a frequency lies that is equal to the product of the rotational speed of the wheel () on the drive side and the number N of blocking elements (). The measured signal () filtered by the band-pass filter () is fed to an evaluation unit (). When the filtered measured signal () exceeds a limit value, the evaluation unit () reduces the rotational speed of the motor ().

Handheld power tool and control method

An electrical hand-held tool includes an electric motor () having a rotor shaft () extending transverse to the tool percussion axis (A), a rotor sheet stack () supported on the rotor shaft, and a pinion () supported on the rotor shaft, a percussion mechanism () including an eccentric (), and a drive gear () engageable with the motor pinion () for driving the eccentric (), with the rotor sheet stack () being arranged, with respect to the percussion axis A, completely diametrically opposite the drive gear ().

Percussion electrical hand held tool

An electrical, rotary-percussion hand-held includes a spindle (), an electric motor for driving the spindle at different rotational speeds corresponding to different operational modes, a percussion mechanism and a gear mechanism arranged between the electric motor () and the spindle () for transmitting a drive torque from the electric motor () to the spindle (), and a rotation shifting device () operatively connected with signal elements (') and electrically connected with the electric motor () for driving the spindle () with a rotational speed corresponding to a selected operational mode.

Electrical, rotary-percussion hand-held tool

An electrical tool includes a housing having inlet () and outlet () openings, a brushless electric motor () and an inverted rectifier () both arranged in the housing () between inlet () and outlet () openings in an air stream () of an air volume (), and a link condensator () located in the housing () in the air stream (), with the inverted rectifier () being arranged, in the air flow direction, downstream of the link condensator () and upstream of the electric motor ().

Electrical, fan-cooled tool

A control method and a switching circuit for braking an electronically commutated electrical motor, wherein operation is in a phase period (T) of an inverter relative to at lest one winding, sequentially, both in a motoring mode and a generating operating mode using various cycles (t -t , t -t ) beginning with zero, such that the driving and braking torques associated with the cycles (t -t , t -t ) produce a resultant braking moment averaged over the phase period (T).

Method of controlling and switching for braking an electronically commutated electrical motor

A depth assembly for use with a hand-held power tool ( ) and including a motorized control unit for adjusting a position of a depth-setting member ( ) and connectable with an energy source ( ) which supplies power thereto, and a micro-controller ( ) for controlling the operation of the control unit ( ) and connected with a length-determining sensor.

Depth stop assembly for a hand-held power tool

A self-starting brushless electric motor having a first motor (stator) with poles arranged in a row, said poles constituting ferromagnetic poles or permanent-magnet poles, a second motor part (rotor) with poles arranged in a row, said poles consisting of ferromagnetic poles or permanent-magnet poles and being arranged opposite the row of poles on the first motor part, wherein the motor part with salient ferromagnetic poles or, if both motor parts have salient ferromagnetic poles, at least one of the motor parts has a permanent-magnet pole, and also a magnetizing winding on the first motor part. The system of poles formed by the pole rows is magnetically asymmetrical in the direction in which the motor parts are movable in relation to each other.

Self-starting electric brushless motor having permanent magnet and reluctance poles

A self-starting brushless electric motor having a first motor part (stator) (,) with poles arranged in a row, the poles constituting ferromagnetic poles (,S) or permanent-magnet poles (,A), a second motor part (rotor) (,) with poles arranged in a row, the poles having ferromagnetic poles (,A) or permanent-magnet poles and being arranged opposite the row of poles on the first motor part (,), wherein the motor part with salient ferromagnetic poles or, if both motor parts have salient ferromagnetic poles, at least one of the motor parts has a permanent-magnet pole, and also a magnetizing winding on the first motor part. The system of poles formed by the pole rows is magnetically asymmetrical in the direction in which the motor parts (,) are movable in relation to each other.

Self-Starting electric brushless motor having permanent magnet and reluctance poles

A method of reducing feedback action on a timely flow of current, which is drawn by a load from a network via rectifier, by active filtering of upper harmonics, which are superimposed on a network first harmonic, with a power factor corrector circuit with a pulse-width modulation of a switch signal which influences the current drawn from the network and flowing through a boost-converter, with the method including dividing a current path between the rectifier (2) and the load (10) in a plurality of parallel channels (It, Jt), and providing in each channel (It, Jt) a similarly active filter, with switch signals of both active filters having a substantially same pulse-width modulation and being phase-sifted relative to each other so that a reduced ripple of the total current, which results form cumulative superimposition of currents in separate channels, is produced at a network input (9); and an active filter for effecting the method.

Method of and an active filter for reducing a residual ripple of a

Self-starting brushless electric motor

A method of reducing feedbacks on a temporary flow of current drawn from a network, during an operation of an inductive load, by active filtering of harmonics of a network fundamental component with a booster converter (6) and according to which the function of a necessary choke of the booster converter is taken up, at least partially, by the inductive load; and a booster converter for effecting the method, in which the function of the booster converter is integrated into the inductive load driving bridge circuit and into the motor, with at least one motor winding being so connected that it replaces, at least partially, the conventional booster converter choke.

Method for reducing feedbacks on a flow of current drawn from a network

An electromotor including a stator (32) having a central receiving region for a rotor (23), at least two, projecting into the rotor-receiving region, stator pole pairs (18, 19, 20, 21), an insulation element (1, 2) provided at each end side of the stator (32), a stator winding (16, 17) surrounding a stator pole pair (18, 19, 20, 21) and a portion of a respective insulation element (1, 2), a permanent magnet (14, 15) between a pair of adjacent stator poles (18, 19, 20, 21), and dielectric support elements (7, 8) cooperating with respective insulation elements (1,2) and arranged along the main axis of the rotor-receiving region of the stator (32) between side surfaces (28, 29, 30, 31) of the stator poles (18, 19, 20, 21), which extend substantially parallel to the main axis of the rotor-receiving region of the stator (32) and to each other, and the stator windings (16, 17), respectively.

Growing community of inventors

Munich, Germany

Walter Wissmach