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Electric machinery

A technology of machinery and appliances, applied in the field of electromechanical appliances

Active Publication Date: 2018-06-08
MAKITA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the protective function is activated during operation and the motor stops, the user does not necessarily turn off the operation switch immediately.
In particular, when the operation switch is a switch with a so-called lock mechanism that maintains the on state even if the user removes the hand from the operation switch after it is turned on, after the protection function operates and the motor stops, the operation There is a high possibility that the switch will remain on

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0037] (1) Electrical structure of electric tool 1

[0038] figure 1 The electric tool 1 according to the present embodiment shown is, for example, an electric tool for drilling a workpiece and performing screw fastening work.

[0039] Such as figure 1 As shown, the electric tool 1 of this embodiment includes a tool body 2 and a battery pack 3 . The battery pack 3 is detachable relative to the tool body 2 . figure 1 A state in which the battery pack 3 is attached to the tool body 2 is shown.

[0040] The battery pack 3 includes a battery 40 , a positive terminal 41 and a negative terminal 42 . The battery 40 has a plurality of battery cells connected in series, or a plurality of battery cells connected in series and parallel. Each battery cell in this embodiment is a secondary battery (for example, a lithium ion secondary battery) cell.

[0041] In the battery pack 3 , the positive electrode of the battery 40 is connected to the positive terminal 41 , and the negative el...

no. 2 approach

[0116] use Figure 4 An electric power tool 51 according to the second embodiment will be described. Figure 4 The power tool 51 of this second embodiment is shown with figure 1 Compared with the electric tool 1 of the first embodiment shown, the structure of the control circuit 53 of the tool body 52 is partially different.

[0117] Specifically, the signal input to the second input terminal 32 of the hardware protection circuit 14 is the motor state signal d output from the controller 13 in the second embodiment, as opposed to the motor state signal d in the first embodiment. drive signal b. Except for the difference in the signal input to the second input terminal 32 of the hardware protection circuit 14, it is the same as the electric power tool 1 of the first embodiment.

[0118] When the motor drive signal b is at H level, it can be determined that the motor 4 is rotating. On the other hand, when the motor drive signal b is at L level, the first drive signal from the...

no. 3 approach

[0124] use Figure 5 The electric power tool 61 of the third embodiment will be described. Figure 5 The electric tool 61 of this third embodiment is shown with figure 1 Compared with the electric tool 1 of the first embodiment shown, the structure of the control circuit 63 of the tool body 62 is partially different.

[0125] Specifically, the signal input to the second input terminal 32 of the hardware protection circuit 14 corresponds to the motor state signal d in the first embodiment, and is output from the first AND circuit 16 in the third embodiment. first drive signal. Except for the difference in the signal input to the second input terminal 32 of the hardware protection circuit 14, it is the same as the electric power tool 1 of the first embodiment.

[0126] When the first drive signal output from the first AND circuit 16 is at H level, it can be determined that the motor 4 is rotating. On the other hand, when the first drive signal is at L level, the first FET 11...

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Abstract

The present invention provides a high-reliability electromechanical device capable of maintaining the stopped state satisfactorily when a protective function operates to stop the motor while the motor is being driven. The first FET (11) and the second FET (12) are connected in series on a path from the battery (40) to the motor (4). When the operation switch (6) is turned on, the controller (13) outputs a motor drive signal (b) to turn on the first FET (11) to drive the motor. The controller has a protection function of stopping the output of the motor drive signal to stop the motor when a predetermined protection condition is established when the motor is driven by outputting the motor drive signal regardless of the operation state of the operation switch. A hardware protection circuit (14) monitors the operating state of a protection function by a controller, and turns off at least the second FET by cutting off a signal (e) when the protection function is activated.

Description

technical field [0001] The present invention relates to an electromechanical device that operates using a motor as a drive source. Background technique [0002] There are known electric mechanical appliances (for example, electric tools, electric working machines, etc.) configured as follows: a switching element is provided on the energization path from a power source to a motor, and when the user turns on the operation switch, the switching element is turned on to drive the motor. . There is also a type of electromechanical device having the above-mentioned structure that has a protective function of forcibly turning off the switching element to stop energization even if an operation switch is turned on when an abnormality occurs during motor driving. [0003] Patent Document 1 discloses an electric power tool device configured such that when an operation switch is turned on, a control unit turns on a switching element to conduct a conduction path from a battery to a motor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08
CPCH02P29/0241H02P3/02
Inventor 须田秀和
Owner MAKITA CORP
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