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An angle grinder with power-off protection and its circuit

An angle grinder, power-off protection technology, applied in emergency protection circuit devices, grinding/polishing equipment, grinders, etc., can solve problems such as hidden safety hazards and lack of power-off protectors

Active Publication Date: 2016-07-06
ZHEJIANG JINMEI TOOLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the present invention are: there is no effective power-off protector, and when the motor suddenly loses power and then suddenly receives power, the motor will start automatically, which has potential safety hazards

Method used

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  • An angle grinder with power-off protection and its circuit
  • An angle grinder with power-off protection and its circuit

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Effect test

Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the examples.

[0026] refer to figure 1 , an angle grinder circuit with power-off protection, comprising a power input end; a motor circuit; a power-off protection circuit electrically connected between the power input end and the motor circuit; electrically connected between the motor circuit and the power-off protection circuit The delta-connected capacitor circuit between them, the delta-connected capacitor circuit includes three delta-connected capacitors C1, C2, and C3, and the motor circuit includes two serially connected stator windings N1, N2, where one end of C1 is connected to one end of N1, and the other end is connected to N2 connection, the connection point of C2, C3 is electrically connected with the connection point of N1, N2. An inductance coil L1 is connected in series between C1 and N1, and an inductance coil L2 is connected in series between the connection point of C...

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Abstract

The invention relates to an angle grinder with power-off protection and a circuit of the angle grinder. The angle grinder is characterized by comprising a power source input end, a motor circuit, a power-off protection circuit and a triangular connection capacitive circuit. The power-off protection circuit is electrically connected between the power source input end and the motor circuit, and the triangular connection capacitive circuit is electrically connected between the motor circuit and the power-off protection circuit. The triangular connection capacitive circuit comprises three triangular connection capacitors C1, C2 and C3. The motor circuit comprises two serially-connected stator windings N1 and N2. One end of the C1 is connected with one end of the N1, the other end of the C1 is connected with the N2, and the joint of the C2 and the C3 is electrically connected with the joint of the N1 and the N2. Automatic start-up of the angle grinder can be prevented when the angle grinder is suddenly powered off and then suddenly powered on, and dangers caused by automatic operation of the angle grinder without manual control can be avoided.

Description

technical field [0001] The invention relates to a hand-held electric tool, in particular to an angle grinder with power-off protection and a circuit thereof. Background technique [0002] Angle grinder is to use high-speed rotating sheet grinding wheel, rubber grinding wheel, wire wheel, etc. to grind, cut, derust, and polish metal components. Angle grinders are suitable for cutting, grinding and brushing metal and stone. Since the angle grinder in the prior art does not have a power-off protection function, if the plug of the angle grinder falls off during use, the power grid fails or other reasons cause the motor to suddenly lose power, the operator may be For various reasons, the switch is not turned off in time, and when the power grid suddenly resumes power supply, the motor in the angle grinder will run by itself, and the output shaft of the motor will drive the grinding wheel to rotate at a high speed. Rotation will endanger personal and property safety. [0003] T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24B23/00H02H7/08
Inventor 高金云
Owner ZHEJIANG JINMEI TOOLS
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