Electric power tool and method for operating same
First Claim
Patent Images
1. A method for operating an electric power tool, the method comprising the steps of:
- carrying out an output request for the electric power tool operating at a speed by actuating a switch of the electric power tool;
activating a torque limitation of an electric motor of the electric power tool when a load moment exceeds a predetermined threshold, the torque limitation having a torque limit value;
interrupting a current to the electric motor in an at least partially automatic fashion when a criterion for activating the torque limitation is detected; and
supplying, when a predetermined time span has elapsed, the electric motor with the current again and increasing the torque limit value while keeping the speed to a low speed value between 0.5 and 3 rps.
1 Assignment
0 Petitions
Accused Products
Abstract
In an electric power tool and a method for operating an electric power tool, a torque limitation of an electric motor reacts when a load moment exceeds a predetermined threshold and in which an output request is carried out by means of a switch. A supply of current to the motor is interrupted when a criterion for the reaction of the torque limitation is detected based on a speed detection of the motor.
-
Citations
17 Claims
-
1. A method for operating an electric power tool, the method comprising the steps of:
-
carrying out an output request for the electric power tool operating at a speed by actuating a switch of the electric power tool; activating a torque limitation of an electric motor of the electric power tool when a load moment exceeds a predetermined threshold, the torque limitation having a torque limit value; interrupting a current to the electric motor in an at least partially automatic fashion when a criterion for activating the torque limitation is detected; and supplying, when a predetermined time span has elapsed, the electric motor with the current again and increasing the torque limit value while keeping the speed to a low speed value between 0.5 and 3 rps. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. An electric power tool, comprising:
-
an electric motor; a switch by which an output request is carried out for the electric power tool operating at a speed; means for activating a torque limitation of said electric motor when a load moment exceeds a predetermined threshold, the torque limitation having a torque limit value; and means for interrupting a current to said electric motor when a criterion for an activation of the torque limitation is detected, wherein when a predetermined time span has elapsed, the electric motor is supplied with the current again and the torque limit value is increased while the speed is kept to a low speed value between 0.5 and 3 rps. - View Dependent Claims (10, 11, 12)
-
-
13. An electric power tool, comprising:
-
an electric motor; a switch by which an output request is carried out for the electric power tool operating at a speed; means for activating a torque limitation of said electric motor when a load moment exceeds a predetermined threshold, the torque limitation having a torque limit value; and means for interrupting in an at least partially automated fashion a connection between said electric motor and a battery unit that powers said electric motor when a criterion for an activation of the torque limitation is detected, wherein the connection is resumed when a predetermined time span has elapsed, and the torque limit value is increased while the speed is kept to a low speed value between 0.5 and 3 rps. - View Dependent Claims (14, 15, 16)
-
-
17. A method for operating an electric power tool, the method comprising the steps of:
-
carrying out an output request for the electric power tool operating at a speed by actuating a switch of the electric power tool; activating a torque limitation of an electric motor of the electric power tool when a load moment exceeds a predetermined threshold, the torque limitation having a torque limit value; interrupting a connection between the electric motor and a power source that powers the electric motor when a criterion for an activation of the torque limitation is detected; and resuming the connection and increasing the torque limit value while keeping the speed to a low speed value between 0.5 and 3 rps when a predetermined time span has elapsed.
-
Specification