Electric tool and control unit and control method of bidirectional rotating motor thereof

Abstract

The invention provides a control unit (40) and a determination method for determining the rotation direction of a motor (10) of an electric tool, and an electric tool comprising the control unit (40).The motor (10) is a bi-directional rotating motor, and the electric tool alternately performs an effective operating stroke and an idle stroke during operation. The control unit (40) comprises a current sensor (42) and a controller (48), wherein the controller (48) is configured to judge whether a judgment parameter meets a corresponding reverse condition or not when the electric tool starts a new operation process and instruct the motor (10) to start so as to enable the direction of the rotational motion output by the motor (10) to be opposite to the direction of the rotational motion in thelast operation process if the judgment parameter meets the corresponding reverse condition, wherein the judgment parameter and the corresponding reverse condition are related to the effective operation stroke executed by the electric tool from the last reverse of the rotational motion output by the motor (10). The determination method is substantially only related to the effective operation stroke, and is irrespective of the idle stroke performed by the electric tool.

Description

technical field [0001] The present application relates to an electric tool including a bidirectional rotating motor, and in particular to a control unit and a control method for controlling the reverse operation of the rotating direction of the bidirectional rotating motor of the electric tool. Background technique [0002] Many hand-held power tools, such as reciprocating saws, hammer drills, electric picks, etc., use motors to drive the tool head of the power tool to perform desired actions. The motors of these tools usually output unidirectional rotary motion. There is a motion transmission mechanism between the motor and the tool head. The gear transmission mechanism is widely used in this application because of its compact structure, high transmission precision, wide application range, and large transmission ratio. In applications utilizing a gear transmission as a transmission, the teeth of meshing gears are usually formed with a hardened layer to resist wear during me...

AI Technical Summary

Problems solved by technology

For example, for electric tools such as electric drills and reciprocating saws, the actions performed by the tool head include both effective operation strokes or tool machining strokes that perform effective processing and idle strokes that do not perform effective processing or tool return strokes, and these two strokes The segment load, power consumption, time, and wear on the gear teeth are all different. The above-mentioned control method obviously does not take these factors into account, so that the wear on the two opposite flanks of the gear teeth is still uneven.

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