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Power tool

A technology of electric tools and voltage, applied in the direction of manufacturing tools, electric components, electrical components, etc., can solve problems such as damage to switching elements, and achieve the effect of preventing damage

Inactive Publication Date: 2015-12-30
KOKI HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for example, when a 100V electric tool is connected to a high-voltage commercial AC power supply of 200V, the current value flowing through the motor exceeds the maximum rated value of the switching element used for driving the motor as a result of the above-mentioned sudden increase, and the switch components may be damaged

Method used

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Embodiment Construction

[0088] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, the present invention will be described by taking the case where it is applied to an impact screwdriver as an example.

[0089] figure 1 It is a cross-sectional view of the impact screwdriver according to the embodiment. Impact screwdriver 1 is equivalent to electric tool of the present invention, as figure 1 As shown, it is mainly composed of a casing 2, a motor 3, a gear mechanism 4, a hammer 5, an anvil part 6, an inverter circuit part 7 and a power cord 8.

[0090] The housing 2 is made of resin, constitutes the periphery of the impact screwdriver 1, and is mainly composed of a substantially cylindrical body portion 2a and a handle portion 2b extending from the body portion 2a. In the body part 2a such as figure 1 As shown, the motor 3 is arranged so that its axial direction coincides with the longitudinal direction of the trunk portion 2 a , and the gear me...

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Abstract

Provided is a power tool capable of maintaining the drive force for a motor and of preventing damage to a switching element, even for differing power supply voltages. An impact driver (1) has: a motor (3); a rectification circuit (23) that rectifies the input voltage from a commercial power supply (30); an inverter circuit (20) that supplies rectified voltage output from the rectification circuit (23), to the motor (3) as drive force; and a calculation unit (24) that, by changing the duty control of the motor (3) in accordance with the power supply voltage of the commercial power supply (30), suppresses the occurrence of overcurrent whereby the current value that flows to the motor (3) exceeds a prescribed current value.

Description

technical field [0001] The present invention relates to an electric tool including a motor driven by a commercial AC power source. Background technique [0002] Conventionally, in an electric tool used connected to a commercial AC power source, AC power from the commercial AC power source is rectified by a rectifier circuit, smoothed by a smoothing capacitor, and supplied to an inverter circuit. Then, predetermined drive power is output from the inverter circuit to the motor, and the motor is driven. [0003] In addition, in recent years, small-sized power tools without smoothing capacitors have become widespread. It is well known in such power tools that the value of the current flowing through the motor suddenly increases at the time of the maximum amplitude of the AC voltage. [0004] However, commercial AC power supplies have different voltage specifications depending on the country. Therefore, for example, when a 100V electric tool is connected to a high-voltage comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B25F5/00
CPCH02K7/145H02K11/33B25F5/00H02P6/28
Inventor 小泉俊彰岩田和隆
Owner KOKI HLDG CO LTD