Method for regulating a speed of an electric motor of a power tool
AssigneeRobert Bosch GmbH
InventorsJoerg Koniakowsky, Stefan Mock
Life of this patent
Estimating the term…
Abstract
A method for regulating a speed of an electric motor of a power tool, the speed of the electric motor being established as a function of an actuation of a control device, the control device being actuated in such a way that a speed is requested which is less than a maximum speed, the speed being set in such a way that, in a first speed range upon an increase of the torque output by the electric motor, the speed decreases with a first negative slope, the speed being set in a second speed range in such a way that the speed proceeds with a second slope upon an increase of the output torque, the second slope being greater than the first slope when considered mathematically.
Claims24
A method for regulating a speed of an electric motor of a power tool, the method comprising:
- establishing the speed of the electric motor as a function of an actuation of a control device, the control device being actuated so that a speed is requested which is less than a maximum speed, the speed being set so that, in a first speed range upon an increase of torque output by the electric motor, the speed decreases with a first negative slope, the speed being set in a second speed range so that the speed extends with a second slope upon an increase of the output torque, the second slope being greater than the first slope when considered mathematically;
- wherein a threshold speed is provided, the threshold speed delimiting two speed ranges, the curve of the speed over the torque having different slopes in the two speed ranges.
A control unit for regulating an electric motor of a power tool, comprising:
- a control module configured to perform the following:
- establishing the speed of the electric motor as a function of an actuation of a control device, the control device being actuated so that a speed is requested which is less than a maximum speed, the speed being set so that, in a first speed range upon an increase of the torque output by the electric motor, the speed decreases with a first negative slope, the speed being set in a second speed range so that the speed extends with a second slope upon an increase of the output torque, the second slope being greater than the first slope when considered mathematically;
- wherein the control module includes a speed regulator, a setpoint current limiter, and a current regulator.
A power tool, comprising:
- a control unit;
- an electric motor, the control unit designed to regulate a speed of the electric motor of a power tool, the control unit designed to establish the speed of the electric motor as a function of an actuation of a control device, the control device being actuated so that a speed is requested which is less than a maximum speed, the speed being set so that, in a first speed range upon an increase of torque output by the electric motor, the speed decreases with a first negative slope, the speed being set in a second speed range so that the speed extends with a second slope upon an increase of the output torque, the second slope being greater than the first slope when considered mathematically,
- wherein a threshold speed is provided, the threshold speed delimiting two speed ranges, the curve of the speed over the torque having different slopes in the two speed ranges.
A method for regulating a speed of an electric motor of a power tool, the method comprising:
- establishing the speed of the electric motor as a function of an actuation of a control device, the control device being actuated so that a speed is requested which is less than a maximum speed, the speed being set so that, in a first speed range upon an increase of torque output by the electric motor, the speed decreases with a first negative slope, the speed being set in a second speed range so that the speed extends with a second slope upon an increase of the output torque, the second slope being greater than the first slope when considered mathematically;
- wherein the speed is kept approximately constant in the second speed range, so that the second slope has a value of zero.
A method for regulating a speed of an electric motor of a power tool, the method comprising:
- establishing the speed of the electric motor as a function of an actuation of a control device, the control device being actuated so that a speed is requested which is less than a maximum speed, the speed being set so that, in a first speed range upon an increase of torque output by the electric motor, the speed decreases with a first negative slope, the speed being set in a second speed range so that the speed extends with a second slope upon an increase of the output torque, the second slope being greater than the first slope when considered mathematically;
- wherein one of a ratio between the speed and the output torque, or a threshold speed, is changed via an actuation of an operating element on the power tool.
A method for regulating a speed of an electric motor of a power tool, the method comprising:
- establishing the speed of the electric motor as a function of an actuation of a control device, the control device being actuated so that a speed is requested which is less than a maximum speed, the speed being set so that, in a first speed range upon an increase of torque output by the electric motor, the speed decreases with a first negative slope, the speed being set in a second speed range so that the speed extends with a second slope upon an increase of the output torque, the second slope being greater than the first slope when considered mathematically;
- wherein one of a threshold speed, or a ratio between the speed and the output torque, is changed via a communication interface.
Dependencies are inferred from the claim text.