Hilti Aktiengesellschaft

Rudolf Bauer

Walter Wissmach

Erwin Manschitz

Ferdinand Kristen

Holger Cecchin

Christoph Kink

Vilmos T&ouml;r&ouml;k

Hans-Jürgen Pfisterer

Vilmos Török

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 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

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Landsberg, Germany

Rudolf Bauer