Portable tool for mobile use
A portable tool, such as a spreader tool, cutting tool or combination spreading/cutting tool is for mobile use. The tool has an electric motor, a rechargeable battery received on the tool, a mechanically or hydraulically driven, displaceable piston rod for performing spreading and/or cutting and/or lifting or pressing. An electronic control and regulation unit controls/regulates the electric motor, such as a brushless DC motor. The electronic control and regulation unit specifies a first operating mode in which the electric motor is operated at a first frequency, and a second operating mode in which the electric motor is operated at a second frequency. The operating mode is switchable by an operator of the tool using a manually operable switch between the first and the second operating modes. The rotational speed of a three-phase current electric motor is higher at the second frequency than at the first frequency.
1 . A portable work tool comprising a spreading tool, cutting tool or combination tool having cutting and spreading functions, for mobile use, the tool comprising:
an electric motor comprising a brushless direct current motor;
a rechargeable battery placed at the tool;
a mechanically or hydraulically driven, displaceable piston rod for spreading and/or cutting tasks and/or lifting or pushing;
an electronic control and regulation unit for controlling and/or regulating the electric motor;
wherein the electronic control and regulation unit establishes a first operating mode, in which the electric motor operates at a first frequency, and wherein the electronic control and regulation unit establishes a second operating mode, in which the electric motor is operated at a second frequency,
wherein an operating mode is switchable by a switch actuatable by the operator of the tool between the first operating mode and the second operating mode,
wherein the rotational speed of the electric motor is higher in the second frequency than in the first frequency, and
wherein the tool comprises a load display, in which a power of the tool is displayed on the basis of a current drawn by the electric motor during operation,
wherein the electronic control and regulation unit is connected via a control line to a control valve to switch between the first and second frequencies via a control signal triggered by the control valve.
2 . The tool according to claim 1 , wherein switching from the first frequency to the second frequency is enabled only in a sub-range of the entire power spectrum of the electric motor.
3 . The tool according to claim 1 , wherein the rotational speed of the electric motor is constant in the first frequency as well as the second frequency.
4 . The tool according to claim 1 , wherein a power consumption threshold is specified, above which switching from the first frequency to the second frequency or operation of the work tool in the second frequency is not possible.
5 . The tool according to claim 1 , wherein the control valve may be for switching a movement direction of the piston rod, and by actuating the control valve, switching of the operating mode occurs between the first and second operating mode.
6 . The tool according to claim 5 , wherein the control valve is a rotary valve and switching between the first operating mode and the second operating mode occurs by rotating the control valve by a predetermined angle range.
7 . The tool according to claim 1 , wherein heat created while operating by the drawn current of the electric motor is recorded and also used as a control variable.
8 . The tool according to claim 1 , wherein heat created while operating by the drawn current of the electric motor is recorded in a local region of the electronic control and regulation unit.
9 . The tool according to claim 1 , further comprising a first temperature probe, which records heat created while operating by the drawn current of the electric motor.
10 . The tool according to claim 9 , wherein ambient temperature is recorded and included in controlling.
11 . The tool according to claim 9 , further comprising a second temperature probe.
12 . The tool according to claim 1 , wherein controlling the electric motor is based on the drawn current, heat created by the drawn current of the electric motor and/or ambient temperature.
13 . The tool according to claim 1 , wherein an automatic switchover from the second operating mode to the first operating mode or a shutdown occurs within a scope of controlling.
14 . The tool according to claim 13 , wherein switchover occurs taking into consideration a time delay.
15 . The tool according to claim 1 , wherein a display device is provided comprising:
an operating status display, which shows that the tool is in a second operating mode, and/or
an operating status display, which shows that a duration of maximum output is exceeded, and/or
a temperature display, which shows a range in which the current operating temperature of semiconductor elements lies.
16 . The tool according to claim 15 , wherein the load display has a warning mode, which shows that the tool is in an overload range and operation must be stopped.
17 . The tool according to claim 1 , wherein the tool comprises:
a hydraulic pump, and/or
a hydraulic reservoir, and/or
the piston rod, and/or
a hydraulic cylinder for holding the displaceable piston rod, and/or
hydraulic lines, and/or
a compensation device.