Handheld power tool including an oscillating excitation actuator

Patent metadata

Field	Value
Publication number	US-2019337139-A1
Application number	US-201716305295-A
Country	US
Kind code	A1
Filing date	May 8, 2017
Priority date	Jun 2, 2016
Publication date	Nov 7, 2019
Grant date	—

Abstract

A handheld power tool including at least one drive unit, includes at least one oscillating excitation actuator for the oscillating drive of an associated insertion tool and includes an electronics unit for the controlled energy supply of the drive unit, the electronics unit including at least one inverter, one transformer, and one measuring circuit, the inverter being configured to generate a primary-side transformer voltage and a primary-side transformer current of the transformer, the transformer being configured to transform the primary-side transformer voltage and the primary-side transformer current into an application-specific supply voltage and a supply current for the drive unit, and a controller being associated with the measuring circuit, which is configured to generate at least one control signal for the inverter from a predefined setpoint value and a measured value detected by the measuring circuit, the measuring circuit is situated between the inverter and the transformer.

First claim

1 - 11 . (canceled)

12 . A handheld power tool, comprising:
at least one drive unit, which includes at least one oscillating excitation actuator for the oscillating drive of an associated insertion tool; an electronics unit for providing a controlled energy supply of the drive unit, the electronics unit including at least one inverter, one transformer, one measuring circuit, and a controller associated with the measuring circuit; wherein the inverter is configured to generate a primary-side transformer voltage and a primary-side transformer current of the transformer, wherein the transformer is configured to transform the primary-side transformer voltage and the primary-side transformer current into an application-specific supply voltage and a supply current for the drive unit wherein the controller, which is associated with the measuring circuit, is configured to generate at least one control signal for the inverter from a predefined setpoint value and a measured value detected by the measuring circuit, and wherein the measuring circuit is situated between the inverter and the transformer.

13 . The power tool of claim 12 , wherein the measuring circuit is configured for the primary-side measurement of the transformer voltage and the transformer current.

14 . The power tool of claim 12 , wherein the controller is configured to generate the at least one control signal for the inverter from a predefined phase setpoint value and a measured value detected by the measuring circuit.

15 . The power tool of claim 12 , wherein the transformer is configured for contactless energy transmission.

16 . The power tool of claim 15 , wherein the transformer is configured as a rotary transformer.

17 . The power tool of claim 12 , wherein a phase zero crossing of a terminal impedance of the drive unit and a phase zero crossing of a transformer input impedance of the transformer are associated with a predefined operating frequency within predefined tolerances.

18 . The power tool of claim 17 , wherein a transformer input impedance phase associated with the transformer input impedance is predefined as regulating information for a phase regulation of the drive unit.

19 . The power tool of claim 12 , wherein the controller is configured as a digital controller.

20 . The power tool of claim 12 , wherein a power filter is situated between the transformer and the drive unit.

21 . The power tool of claim 12 , wherein the power tool is configured as an ultrasonic drill.

22 . A method for operating a handheld power tool, the method comprising:
generating, via a controller associated with a measuring circuit, at least one control signal for the inverter from a predefined setpoint value and a measured value detected by the measuring circuit, wherein the handheld power tool includes at least one drive unit, which includes at least one oscillating excitation actuator for an oscillating drive of an associated insertion tool, an electronics unit for providing a controlled energy supply of the drive unit, the electronics unit including at least one inverter, one transformer, and the measuring circuit, the inverter being configured to generate a primary-side transformer voltage and a primary-side transformer current of the transformer, the transformer being configured to transform the primary-side transformer voltage and the primary-side transformer current into an application-specific supply voltage and a supply current for the drive unit, and the controller associated with the measuring circuit; and performing a primary-side measurement of the transformer voltage and the transformer current of the transformer, wherein the measuring circuit is situated between the inverter and the transformer.

Assignees

• Bosch Gmbh Robert

Inventors

• Kuehner Jochen
• Kuhnen Klaus

Classifications

• B23B37/00

  Boring by making use of vibrations of ultrasonic frequency (working materials by subjecting the grinding tools or the abrading medium to vibration, e.g. grinding with ultrasonic frequency, B24B1/04) · CPC title

• B25F5/00 Primary

  Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for · CPC title

• B25F5/02 Primary

  Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} · CPC title