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Method and device for detecting the switching position of an operating switch for putting an electric motor into operation

A technology of running switch and putting into operation, which is applied in the direction of deceleration device of AC motor, starter of single DC motor, motor control, etc., can solve the problems of high cost and high consumption, and achieve the effect of simplified structure and reliable restart

Active Publication Date: 2017-10-31
ANDREAS STIHL AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to switch on the electric motor via the actuation circuit, an operating switch with additional contacts for detecting the switching state of the operating switch is usually necessary, which is complex in design and therefore expensive

Method used

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  • Method and device for detecting the switching position of an operating switch for putting an electric motor into operation
  • Method and device for detecting the switching position of an operating switch for putting an electric motor into operation
  • Method and device for detecting the switching position of an operating switch for putting an electric motor into operation

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Embodiment Construction

[0030] exist figure 1 A portable, hand-held power tool 1 is shown in FIG. 1 , which is represented in the exemplary embodiment as a hedge trimmer. The power tool 1 is an electric power tool and is driven by an accumulator 10 which is inserted into a housing 2 of the power tool. The presented work tool 1 has a tool 3 driven by an electric motor 50 ( figure 2 )drive.

[0031] The power tool 1 is configured with a front handle 4 and a rear handle 5, wherein in the exemplary embodiment a switch 30 for operating is arranged in the rear handle 5 ( figure 2 ) of the operating element 6.

[0032] The power implement 1 can also be embodied as a battery-operated blower, a battery-operated field cutter, a battery-operated hedge trimmer or a similar battery-operated power implement.

[0033] Such as figure 2 As shown, battery 10 forms a voltage source 20 for power tool 1 . The voltage source 20 provides for use a supply voltage U which is connected to the control circuit 40 via t...

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Abstract

The invention relates to a method and a device for detecting the switching position of an operating switch for putting an electric motor into operation. The invention relates to a method for detecting the switching position of an operating switch (30) for starting up an electric motor (50), wherein the electric motor (50) is connected to a voltage source (20) via a drive circuit (40) and the operating switch is disposed between the drive circuit and the voltage source. The operating switch (30) is arranged to switch the supply voltage (U) of the voltage source (20) as input voltage (UE) to the drive circuit (40). According to the invention, after switching off the electric motor (50), the input voltage (UE) of the drive circuit (40) is monitored and a gradient of a voltage increase (dU / dt) of the input voltage (UE) is determined. The determined gradient of the voltage increase (dU / dt) of the input voltage (UE) is compared with a predetermined limit value and when the predetermined limit value of the operating switch (30) is detected closed and the electric motor (50) is operated again via the control circuit (40).

Description

technical field [0001] The invention relates to a method and a device for detecting the switch position of an operating switch for putting an electric motor into operation (Inbetriebnahme), wherein the electric motor is connected to a voltage source via an actuating circuit, and the operating switch is arranged between the actuating circuit and the voltage source, the operating switch being arranged between the operating circuit and the voltage source. The running switch connects the supply voltage of the voltage source as an input voltage to the control circuit. Background technique [0002] Methods are known by which an electric motor is put into operation by actuating a circuit. For this purpose, the electric motor is connected to the voltage source via the control circuit, wherein the operating switch is arranged between the control circuit and the voltage source. The operating switch connects the supply voltage to the control circuit, which then puts the connected elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H11/00H02P29/00
CPCH02H11/006H02P29/00H01H9/54H02P1/18B25F5/00H02P9/08G01R31/3277G01R31/34H02P1/16H02P1/02
Inventor K-S.古尔G.利布哈德J.克勒克J.西勒H.罗伊芬
Owner ANDREAS STIHL AG & CO KG
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