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US 2024/0253202 A1Published application
Electric hand-held power tool
AssigneeHilti Aktiengesellschaft
InventorFlorian HURKA
Life of this patent
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Abstract
An electric hand-held power tool, having a brushless DC motor and a control unit for field-oriented control of the DC motor on the basis of a current request signal and a target voltage value derived from the current request signal, wherein the hand-held power tool is further designed to provide a system voltage to supply the DC motor, wherein the control unit is set up to adjust the current request signal taking into account a voltage difference between the system voltage and the target voltage value.
Claims12
1-9. (canceled)
10:
- An electric hand-held power tool comprising:
- a brushless DC motor;
- and
- a controller for field-oriented control of the DC motor on the basis of a current request signal and a target voltage value derived from the current request signal, a system voltage supplying the DC motor;
- the controller set up to adjust the current request signal taking into account a voltage difference between the system voltage and the target voltage value.
2 more elements
11:
- The hand-held power tool as recited in claim 10 wherein the controller is set up to take into account the voltage difference in a variable manner.
12:
- The hand-held power tool as recited in claim 11 wherein the controller is set up to take into account the system voltage or the target voltage value in transformed form.
13:
- The hand-held power tool as recited in claim 10 wherein the controller is set up to amplify the voltage difference.
14:
- The hand-held power tool as recited in claim 13 wherein the controller amplifies the voltage difference via a PI controller.
15:
- The hand-held power tool as recited in claim 10 wherein the controller is set up to adjust the current request signal only by way of a negative manipulated variable directly or indirectly representing the voltage difference.
16:
- The hand-held power tool as recited in claim 10 wherein the controller is set up to ascertain the target voltage values between a current controller of the controller and the DC motor.
17:
- The hand-held power tool as recited in claim 10 wherein the controller is set up to adjust the current request signal exclusively taking into account a voltage difference between the system voltage and the target voltage value.
18:
- The hand-held power tool as recited in claim 10 wherein the system voltage is provided via a rechargeable battery pack.
19:
- The hand-held power tool as recited in claim 17 wherein the system voltage is between 12 and 36 volts.
20:
- The hand-held power tool as recited in claim 10 wherein the hand-held power tool is designed as a cordless screwdriver.