Andreas Stihl Ag Co. Kg

René Wichert

Gernot Liebhard

Heiko Rosskamp

Simon Trinkle

Arne Untermann

Andreas Binder

Jochen Oerding

Christian Renz

Claudius Kischka

Heiko Roßkamp

The invention relates to a method for starting an electronic drive circuit for the windings of an electric motor. A control unit, which is connected to a voltage source, is provided as well as a capacitor connected via a system switch element to the connecting terminals of the voltage source. The capacitor is connected across the input terminals parallel to the drive circuit. An operating circuit controls the system switch element. In order to start the motor, the operating circuit closes the system switch element and charges the capacitor and after the charging of the capacitor, opens the system switch element again. A test step is then started by the control unit, the drive circuit being supplied exclusively by the capacitor voltage (U) during the test step.

Method for starting an electronic drive circuit of an electric motor and circuit arrangement therefor

The invention relates to a blower apparatus () having a blower wheel () for generating a blower air flow (). The blower wheel () is arranged in a housing (), wherein the blower wheel is driven by an electric drive motor (). A blower tube () via which the generated blower air flow () is guided connects at an outlet (). A control unit () is provided for controlling the rotational speed of the electric drive motor. For a quick reduction of the blower air flow (), it is provided that the control unit () supports the deceleration of the drive motor () through a braking current (I).

Blower apparatus having an electric drive motor

An electric chain saw has an electric drive motor defining a motor-specific characteristic line of the drawn-in current as a function of the rotational speed of the motor. A control unit controls the current flowing through the drive motor below an engaging rotational speed to values below the motor-specific characteristic line. In order to generate an operating point the operator can feel in a working region in a predetermined rotational speed band, a control characteristic line of the electric input power of the electric drive motor as a function of the rotational speed is provided above the engaging rotational speed. The control characteristic line is adapted to reduce the electric input power within the rotational speed band to an approximately even mean power so as to cause the torque of the drive motor to increase within the rotational speed band with falling rotational speed.

Work apparatus having an electric drive motor

The invention relates to a method of controlling the run-up of an electronically commutated electric motor () to drive a tool. A rotor () rotates in the rotating field () of the stator (). The field windings () alternately have a supply voltage applied thereto via an actuation unit () in order to obtain an advancing motor rotating field. For advancing the rotating field in the rotational direction () of the rotor (), the inductance of the arrangement of the field coils (), which is ascertained via a changing measuring current (I), is evaluated and the advancement is carried out upon reaching a maximum.

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Durlangen, Germany

René Wichert