WO2019003741A1

WO2019003741A1 - Electric tool

Info

Publication number: WO2019003741A1
Application number: PCT/JP2018/020164
Authority: WO
Inventors: 祥和河野; 和隆岩田
Original assignee: 工機ホールディングス株式会社
Priority date: 2017-06-30
Filing date: 2018-05-25
Publication date: 2019-01-03
Also published as: JP6874840B2; JPWO2019003741A1

Abstract

Provided is an electric tool which can be suitably controlled depending on which one among an adaptor device and a battery pack is connected. This electric tool (1) is provided with a motor (6), a control circuit (10) for controlling the motor (6), and a power source connection part (2a) which enables the selective connection of a battery pack (20) or an adaptor device connected to an AC power source. The control circuit (10) does not perform a braking control after a switch (7) has been operated for stopping the electric tool when the adapter device is connected to the power source connection part (2a), and performs the braking control after the switch (7) has been operated for stopping the electric tool when the battery pack (20) is connected to the power source connection part (2a).

Description

Electric tool

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an adapter device connected to an alternating current power supply and a power tool which can alternatively connect a battery pack.

Patent Document 1 discloses a power tool which can select a commercial power supply and a battery pack alternatively as a power supply. When using a commercial power supply, replace the battery pack with the adapter device (AC adapter pack) connected to the commercial power supply and attach it to the power tool. In the adapter device, a power supply cord connected to a commercial power supply extends from a housing having substantially the same shape as the housing of the battery pack.

JP 2001-179658 A

Since the adapter device and the battery pack are different from each other in the ability to absorb surge voltage and the ability to supply current, problems may occur in the same control.

The present invention has been made in recognition of such a situation, and an object thereof is to provide a power tool capable of appropriate control depending on which of the adapter device and the battery pack is connected.

One aspect of the present invention is a power tool. This power tool is
Motor,
A tool control unit that controls the motor;
An adapter device connected to an AC power supply and a power supply connection portion capable of selectively connecting a battery pack;
The tool control unit changes the control of the motor depending on which of the adapter device and the battery pack connected to the power supply connection unit is connected.

The tool control unit may change the brake control of the motor depending on which of the adapter device and the battery pack is connected to the power supply connection unit.

A switch for instructing start and stop of the motor;
When the adapter device is connected to the power supply connection unit, the tool control unit does not perform brake control after the switch is stopped and the battery pack is connected to the power supply connection unit. The brake control may be performed after the switch is stopped.

A switch for instructing start and stop of the motor;
An inverter circuit for energizing the motor;
When the adapter device is connected to the power supply connection unit, the tool control unit performs brake control due to a short circuit of a part of the switching element constituting the inverter circuit after the switch is stopped. When the battery pack is connected to the power supply connection unit, brake control may be performed by PWM control of a part of the switching elements constituting the inverter circuit after the switch is stopped.

The tool control unit may change start control of the motor depending on which of the adapter device and the battery pack is connected to the power supply connection unit.

A switch for instructing start and stop of the motor;
When the adapter device is connected to the power supply connection unit, the tool control unit is configured to operate until the motor reaches a predetermined number of rotations after the switch is started and operated than when the battery pack is connected. It is also possible to moderate the increase in rotational speed.

The tool control unit may change the condition of the abnormality determination based on which of the adapter device and the battery pack is connected to the power supply connection unit.

It has a current detection unit that detects the current flowing to the motor,
When the adapter device is connected to the power supply connection portion, at least one of the current threshold and the time threshold of the overcurrent protection may be smaller than when the battery pack is connected.

The combination of the current threshold and the time threshold of the over current protection may be plural, and the time threshold may be smaller as the current threshold is larger.

When the adapter device is connected to the power supply connection unit, the temperature threshold of the high temperature protection on the power supply side may be higher than when the battery pack is connected.

The tool control unit determines which of the adapter device and the battery pack is connected to the power supply connection portion by communication with the adapter device or the battery pack connected to the power supply connection portion, and changes the control of the motor You may

Another aspect of the present invention is a power tool. This power tool is
Motor,
A tool control unit that controls the motor;
An adapter device connected to an AC power supply and a power supply connection portion capable of selectively connecting a battery pack;
The power supply connection unit is alternatively selected from a tool side abnormal signal terminal which is alternatively connected to an abnormal signal terminal for outputting an abnormal signal of the adapter device and the battery pack, and a communication terminal of the adapter device and the battery pack. And the tool side communication terminal connected in the same manner.

The communication terminal may include a temperature signal terminal, and the tool side communication terminal may include a tool side temperature signal terminal.

The tool control unit may control the motor based on temperature information input via the temperature signal terminal and the tool-side temperature signal terminal.

It is to be noted that arbitrary combinations of the above-described components, and those obtained by converting the expression of the present invention among methods, systems, and the like are also effective as aspects of the present invention.

According to the present invention, it is possible to provide an electric power tool capable of appropriate control depending on which of the adapter device and the battery pack is connected.

BRIEF DESCRIPTION OF THE DRAWINGS The plane sectional view of the state equipped with the battery pack 20 of the electric tool 1 which concerns on embodiment of this invention. FIG. 2 is a rear perspective view of the power tool 1; FIG. 2 is a perspective view of a battery pack 20 that can be attached to the power tool 1. FIG. 2 is a perspective view of an AC / DC power adapter 30 mountable to the power tool 1; FIG. 2 is a schematic block diagram of the power tool 1 and the battery pack 20. FIG. 2 is a schematic block diagram of the power tool 1 and the AC / DC power adapter 30. The table which shows an example of the content of the setting table regarding a soft start in grinder and circular saw or table-top circular saw. The table which shows an example of the contents of the setting table about brake control in a grinder and circular saw or table-top circular saw. The table in a grinder showing an example of the contents of the setting table about overcurrent protection. The table | surface which shows an example of the content of the setting table regarding overcurrent protection in circular saw or table-top circular saw. The table showing an example of the contents of the setting table about voltage protection in power tool 1. The table showing an example of the contents of the setting table about overheating protection in electric tool 1. 4 is a control flowchart of the electric power tool 1;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component shown by each drawing, a member, a process, etc., and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention, and are merely examples, and all the features described in the embodiments and the combination thereof are not necessarily essential to the invention.

FIG. 1 is a plan cross-sectional view of the power tool 1 according to the embodiment of the present invention in a state in which the battery pack 20 is mounted. The front and rear direction and the left and right direction are defined by FIG. FIG. 2 is a rear perspective view of the power tool 1. The power tool 1 is a grinder in the illustrated example, but may be another type such as a circular saw, a tabletop circular saw, or the like.

The electric power tool 1 accommodates a motor (electric motor) 6 serving as a drive source inside the housing 2. The motor 6 is an inner rotor type brushless motor here. A power supply connection 2 a is provided at the rear of the housing 2. The power supply connection portion 2a may be a terminal portion for electrical connection, and may include a rail portion for mechanical fixation, a latch engagement portion, and the like in addition to the terminal portion. The battery pack 20 and the AC / DC power adapter 30 as an adapter device can be alternatively attached to the power supply connection portion 2a, and in FIGS. 1 and 2, the battery pack 20 is attached.

In the housing 2, a switch 7 for instructing start and stop of the motor 6 is provided in front of the power supply connection portion 2 a and behind the motor 6. The left portion of the housing 2 is provided with an operation portion 7a for the user to operate the switch 7 on and off. A gear case 4 is provided at the front of the housing 2. The rotation of the motor 6 is transmitted to the grindstone (rotating tool) 9 by a decelerating mechanism (not shown) provided on the gear case 4.

FIG. 3 is a perspective view of the battery pack 20 attachable to the power tool 1. FIG. 4 is a perspective view of the AC / DC power adapter 30 mountable to the power tool 1. The AC / DC power adapter 30 extends from the housing 33 having substantially the same shape as the housing of the battery pack 20, and a power cord 34 connected to the commercial power source extends. Supply.

FIG. 5 is a schematic block diagram of the power tool 1 and the battery pack 20. As shown in FIG. FIG. 6 is a schematic block diagram of the power tool 1 and the AC / DC power adapter 30. As shown in FIG. In the power tool 1, the switching circuit 11 is an inverter circuit including switching elements such as six FETs or IGBTs connected in a three-phase bridge, for example, and performs switching operation according to the control of the control circuit 10 to supply a driving current to the motor 6. Do. The control circuit 10 as a tool control unit includes a microcontroller (microcomputer) or the like, and when the switch 7 is turned on, it starts switching control of the switching circuit 11 and drives the motor 6. The control circuit 10 detects the current flowing through the motor 6 based on the voltage across the shunt resistor R1 as a current detection unit. The control circuit 10 detects an input voltage from the power supply (battery pack 20 or AC / DC power adapter 30) connected to the power tool 1 based on the voltage between the positive terminal and the negative terminal of the power supply connection unit 2a. The control circuit 10 detects the temperature of the switching circuit 11 based on the voltage of the thermistor R2 as a temperature detection element disposed in the vicinity of the switching circuit 11. The control circuit 10 receives a temperature signal and a motor stop signal from the power source (battery pack 20 or AC / DC power adapter 30) connected to the power tool 1 through the power source connection 2a, and communicates with the power source. Do.

As shown in FIG. 5, the battery pack 20 includes a plurality of battery cells (secondary battery cells) 21, a battery protection IC 22, and a microcomputer (battery control unit) 23 as a power control unit. The voltage at both ends of the battery cell 21 is output to the plus terminal and the minus terminal. The battery protection IC 22 monitors the voltage of each battery cell 21 and also monitors the output current from the plurality of battery cells 21 by the voltage across the shunt resistor R3. Further, the battery protection IC 22 detects the temperature of the battery cell 21 based on the voltage of the thermistor R 4 as a temperature detection element disposed in the vicinity of the battery cell 21. The battery protection IC 22 transmits the temperature of the battery cell 21 to the control circuit 10 of the power tool 1. The battery protection IC 22 is in the overdischarge state where the voltage of at least one battery cell 21 has fallen below the threshold, and in the overcurrent state where the main current from the plurality of battery cells 21 has become greater than the threshold And transmits a motor stop signal to the control circuit 10 of the power tool 1. The microcomputer 23 communicates with the power tool 1.

As shown in FIG. 6, the AC / DC power supply adapter 30 includes an AC / DC converter 31 and a microcomputer (adapter control unit) 32 as a power supply control unit. The AC / DC converter 31 converts alternating current input from the alternating current power source 40 into direct current, and outputs the direct current to the plus terminal and the minus terminal. The voltage of the thermistor R5 as a temperature detection element disposed in the vicinity of the AC / DC converter 31 is transmitted to the control circuit 10 of the power tool 1 as a temperature signal. The microcomputer 32 transmits a motor stop signal to the control circuit 10 of the power tool 1 at the time of abnormality. The microcomputer 32 communicates with the control circuit 10 of the power tool 1.

FIG. 7 is a table showing an example of the contents of the setting table regarding soft start in the grinder and the circular saw or table-top saw. The setting table of FIG. 7 is stored in a memory (storage means) (not shown) of the control circuit 10 of the power tool 1. The same applies to the setting tables of FIGS. 8 to 12. 7 and 8 show setting values when the electric power tool 1 is a grinder and when it is a circular saw or a desktop circular saw, the control circuit 10 sets both of them. It is not necessary to store the value, and it is sufficient to store only the setting value corresponding to the type of the power tool 1 on which the device is mounted. As shown in FIG. 7, whether the power tool 1 is a grinder or a circular saw or a desktop circular saw, the voltage supply source (power supply connected to the power connection portion 2 a) is an AC / DC power adapter In the case of 30, the rotational speed increase speed until the motor 6 reaches a predetermined rotational speed after the switch 7 is turned on (starting operation) is smaller than in the case of the battery pack 20. Such a setting value is set because the AC / DC power supply adapter 30 has a current supply capability lower than that of the battery pack 20, so the rotational speed increase speed in the start control of the motor 6 is large as in the case of the battery pack 20. Then, it is because it becomes an overcurrent.

FIG. 8 is a table showing an example of contents of a setting table regarding brake control in the grinder and the circular saw or table-top circular saw. As shown in FIG. 8, in the case where the power tool 1 is a grinder, when the voltage supply source is the AC / DC power adapter 30, there is no brake control after the switch 7 is turned off (stop operation). . On the other hand, when the voltage supply source is the battery pack 20, the brake control after the switch 7 is turned off (stop operation) is PWM control of part of the switching elements constituting the switching circuit 11 (hereinafter referred to as "PWM brake control And is a control that raises the duty of PWM control at 50% / sec. Such a setting value is used in the case of the battery pack 20 while the battery cell 21 can absorb the surge voltage (regenerative energy) generated by the brake by the PWM control, but in the case of the AC / DC power supply adapter 30, the PWM This is because the surge voltage generated by the brake by control can not be absorbed, and there is a risk that the switching element constituting the switching circuit 11 may be damaged due to an overvoltage. When the power tool 1 is a circular saw or a desktop circular saw, the brake control after the switch 7 is turned off is the AC / DC power adapter 30 even if the voltage supply source is the battery pack 20. Even in this case, short circuit control of part of the switching elements constituting the switching circuit 11 (hereinafter also referred to as “short circuit brake control”) is performed.

FIG. 9 is a table showing an example of the contents of the setting table for overcurrent protection in the grinder. FIG. 10 is a table showing an example of the contents of a setting table for overcurrent protection in a circular saw or a desktop circular saw. As shown in FIGS. 9 and 10, there are a plurality of combinations (four in the illustrated example, conditions 1 to 4) in the current threshold and the time threshold of the overcurrent protection, and the larger the current threshold, the smaller the time threshold. As shown in FIG. 9, when the electric power tool 1 is a grinder, the current threshold value in the case where the voltage supply source is the battery pack 20 and the case where the AC / DC power adapter 30 is in any of the conditions 1 to 4 Are the same, but the time threshold is smaller when the voltage source is the AC / DC power adapter 30 than when it is the battery pack 20. As shown in FIG. 10, in the case where the power tool 1 is a circular saw or a desktop circular saw, the voltage supply source is the battery pack 20 and the AC / DC power adapter 30 under any of the conditions 1 to 4. While the time threshold is the same, while the current threshold is smaller when the voltage source is the AC / DC power adapter 30 than when it is the battery pack 20. In any of the set values in FIG. 9 and FIG. 10, considering that the AC / DC power supply adapter 30 has a current supply capability lower than that of the battery pack 20, it is better when the voltage supply source is the AC / DC power supply adapter 30. The overcurrent protection is applied with a smaller current threshold or smaller time threshold than the battery pack 20.

FIG. 11 is a table showing an example of the content of the setting table for voltage protection in the electric power tool 1. The control circuit 10 of the power tool 1 detects an input voltage from a power source (battery pack 20 or AC / DC power adapter 30) connected to the power tool 1. For example, in the case of a battery pack 20 having a nominal voltage of 36 V (10 battery cells 21 of 3.6 V connected in series per cell), the voltage of the battery pack 20 (between the positive terminal and the negative terminal of the power supply connection portion 2a) When the voltage V) is 25 V, that is, the voltage of the battery cell 21 is 2.5 V, the control circuit 10 determines that the battery pack 20 is overdischarged, and stops the motor 6. On the other hand, when the power supply is the AC / DC power adapter 30, for example, the voltage of 36 V is normally output as in the battery pack 20 under normal conditions, but the output voltage of the AC / DC power adapter 30 is descend. When the output voltage of the AC / DC power adapter 30 becomes, for example, 20 V, the control circuit 10 determines that the AC / DC power adapter 30 is abnormal and stops the motor 6. When the current of the motor 6 increases, the voltage drop due to the internal resistance of the battery cell 21 or the AC / DC converter 31 increases, and the decrease in the input voltage from the power supply connection portion 2a increases. For this reason, in addition to the overcurrent protection shown in FIGS. 9 and 10, the motor 6 is stopped also when the input voltage falls below the threshold. The table shown in FIG. 11 shows the threshold of the input voltage, and the value when the voltage supply source is the AC / DC converter 31 is smaller than that when the battery pack 20 is. This takes into account that the AC / DC power adapter 30 has a lower current supply capability than the battery pack 20, as does the threshold value of the over current protection.

FIG. 12 is a table showing an example of the content of the setting table related to overheat protection in the electric power tool 1. The table shown in FIG. 12 shows the threshold for activating the overheat protection (high temperature protection), and the threshold on the power supply side is higher in the case where the voltage supply source is the AC / DC power adapter 30 than in the case of the battery pack 20. It is a large value. This is because the AC / DC converter 31 is stronger at high temperature than the battery cell 21. The threshold on the tool side is the same regardless of the voltage supply source.

FIG. 13 is a control flowchart of the power tool 1. The control circuit 10 communicates with the voltage supply source connected to the power supply connection unit 2a (S1), and determines whether the voltage supply source is the battery pack 20 or the AC / DC power adapter 30 (S2). If the voltage supply source is the battery pack 20 (YES in S2), the control circuit 10 selects a condition when the battery pack 20 is connected from various setting tables shown in FIGS. 7 to 12 (S3). If the voltage supply source is the AC / DC power adapter 30 (NO in S2), the control circuit 10 selects the conditions when the AC / DC power adapter 30 is connected from various setting tables shown in FIGS. 7 to 12. (S4). The control circuit 10 soft-starts the motor 6 at the rotational speed increasing speed set according to the selected condition (S5). The control circuit 10 detects the current value of the motor 6 (S6), and determines whether the current value and the duration time satisfy the overcurrent determination condition (S7). If the overcurrent determination condition is not satisfied (NO in S7), the control circuit 10 detects the input voltage from the voltage supply source (S8) and determines whether the voltage value satisfies the overdischarge determination condition (S10). S9). If the overdischarge determination condition is not satisfied (NO in S9), the control circuit 10 confirms whether or not the motor stop signal is received from the voltage supply source (S10), and the control circuit 10 receives the motor stop signal. If not (NO in S10), it is determined whether the temperature of each part (battery cell 21 or AC / DC converter 31, and switching circuit 11) satisfies the overheat protection determination condition (S11). If the overheat protection determination condition is not satisfied (NO in S11) and the switch 7 is not turned off (NO in S12), the control circuit 10 continues driving the motor 6 while confirming the presence or absence of abnormality (S6 to S11) . When the overcurrent determination condition is satisfied (YES in S7), the control circuit 10 receives the motor stop signal from the voltage supply source (YES in S9), when the overdischarge determination condition is satisfied (YES in S9). ), When the overheat protection determination condition is satisfied (YES in S11) or when the switch 7 is turned off (YES in S12), stop control of the motor 6 is performed (S13), and the motor 6 is stopped (S14) . The stop control of the motor 6 is PWM brake control if the voltage supply source is the battery pack 20, and natural deceleration if the voltage supply source is the AC / DC power supply adapter 30.

According to the present embodiment, the following effects can be achieved.

(1) When the power tool 1 is a grinder, the control circuit 10 changes the brake control of the motor 6 depending on which of the AC / DC power adapter 30 and the battery pack 20 is connected to the power supply connection unit 2a. Thus, appropriate brake control can be performed in accordance with the voltage supply source connected to the power supply connection unit 2a. Specifically, when the AC / DC power adapter 30 is connected to the power supply connection unit 2a, the control circuit 10 does not perform the brake control after the switch 7 is turned off, and hence the control circuit 10 does not perform the brake control. It is possible to reduce the risk that the switching element of the switching circuit 11 is damaged. On the other hand, when the battery pack 20 is connected to the power supply connection portion 2a, the control circuit 10 performs PWM brake control after the switch 7 is turned off. You can stop quickly. As is clear from the above description, changing the brake control is a concept including changing the presence or absence of the brake control.

(2) The control circuit 10 is connected to the power supply connection unit 2a in order to change the start control of the motor 6 depending on which of the AC / DC power adapter 30 and the battery pack 20 is connected to the power supply connection unit 2a. Appropriate start control can be performed according to the voltage supply source. Specifically, when the AC / DC power adapter 30 is connected to the power connection portion 2a, the control circuit 10 turns on the switch 7 after the switch 7 is turned on than when the battery pack 20 is connected. Since the rotation speed increase until the rotation speed reaches a predetermined rotation speed is slowed, the risk of the AC / DC power supply adapter 30 having a current supply capability lower than that of the battery pack 20 becoming an overcurrent can be suppressed.

(3) The control circuit 10 is connected to the power supply connection unit 2a in order to change the condition (threshold) of the abnormality determination depending on which of the AC / DC power adapter 30 and the battery pack 20 is connected to the power supply connection unit 2a. It is possible to perform appropriate control (abnormality determination) according to the selected power supply. Specifically, when the AC / DC power adapter 30 is connected to the power supply connection unit 2a, the control circuit 10 controls the current threshold and the time threshold of the overcurrent protection more than when the battery pack 20 is connected. In order to reduce at least one of the above, it is possible to perform appropriate overcurrent protection according to the current supply capability of the battery pack 20 and the AC / DC power adapter 30. In addition, when the AC / DC power adapter 30 is connected to the power supply connection unit 2a, the control circuit 10 has a temperature threshold for overheat protection (high temperature protection) on the power supply side than when the battery pack 20 is connected. Therefore, appropriate overheat protection can be performed according to the allowable temperature of the battery pack 20 and the AC / DC power adapter 30. Further, when the AC / DC power adapter 30 is connected to the power connection portion 2a, the control circuit 10 reduces the voltage threshold of the overdischarge protection as compared to the case where the battery pack 20 is connected. Appropriate over-discharge protection is possible according to the current supply capacity of the pack 20 and the AC / DC power adapter 30.

(4) The control circuit 10 determines which of the AC / DC power adapter 30 and the battery pack 20 is connected to the power supply connection unit 2a by communication with the voltage supply source connected to the power supply connection unit 2a. Thus, appropriate control can be performed according to the voltage supply source connected to the power supply connection unit 2a. When only one of the AC / DC power adapter 30 and the battery pack 20 has a communication function, the voltage supply source can be determined based on the availability of communication.

Although the present invention has been described above by taking the embodiment as an example, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. It is a place. The following describes the modification.

Even when the electric power tool 1 is a circular saw or a desktop circular saw, the control circuit 10 controls the brake of the motor 6 depending on which of the AC / DC power adapter 30 and the battery pack 20 is connected to the power connection 2a. Control may be changed. When the AC / DC power adapter 30 is connected to the power supply connection unit 2a, short circuit brake control may be performed, and when the battery pack 20 is connected, PWM brake control may be performed. In the case of the short circuit brake control, since there is no problem of the surge voltage, it can be used also when the AC / DC power supply adapter 30 is used as a power supply. The determination of the voltage supply source by the control circuit 10 is not limited to communication, and identification resistors provided in the AC / DC power supply adapter 30 and the battery pack 20 may be used. In this case, neither the AC / DC power adapter 30 nor the battery pack 20 may have a communication function. 7 to 12 may be reversed or the same between the battery pack 20 and the AC / DC power adapter 30 in accordance with the specifications of the parts constituting the AC / DC converter 31. The power tool of the present invention is not limited to the grinder, the circular saw, and the bench round saw exemplified in the embodiment, and may be of other types.

DESCRIPTION OF SYMBOLS 1 ... Electric tool, 2 ... Housing, 2a ... Power supply connection part, 4 ... Gear case, 6 ... Motor, 7 ... Switch, 7a ... Operation part, 9 ... Whetstone (rotation tool), 10 ... Control circuit (tool control part), 11: switching circuit (inverter circuit), 20: battery pack, 21: battery cell, 22: battery protection IC, 23: microcomputer (battery control unit), 30: AC / DC power adapter (adapter device), 31: AC / DC converter, 32 ... microcomputer (adapter control unit), 33 ... housing, 34 ... power cord, 40 ... AC power supply

Claims

Motor,
A tool control unit that controls the motor;
An adapter device connected to an AC power supply and a power supply connection portion capable of selectively connecting a battery pack;
The tool control unit changes the control of the motor according to which one of an adapter device and a battery pack connected to the power supply connection unit is connected.
The power tool according to claim 1, wherein the tool control unit changes the brake control of the motor depending on which of the adapter device and the battery pack is connected to the power supply connection unit.
A switch for instructing start and stop of the motor;
When the adapter device is connected to the power supply connection unit, the tool control unit does not perform brake control after the switch is stopped and the battery pack is connected to the power supply connection unit. The power tool according to claim 2, wherein the brake control is performed after the switch is stopped.
A switch for instructing start and stop of the motor;
An inverter circuit for energizing the motor;
When the adapter device is connected to the power supply connection unit, the tool control unit performs brake control due to a short circuit of a part of the switching element constituting the inverter circuit after the switch is stopped. 3. The electric motor according to claim 2, wherein, when the battery pack is connected to the power supply connection portion, the brake control is performed by PWM control of a part of the switching elements constituting the inverter circuit after the switch is stopped. tool.
The power tool according to any one of claims 1 to 4, wherein the tool control unit changes start control of the motor depending on which of the adapter device and the battery pack is connected to the power supply connection unit.
A switch for instructing start and stop of the motor;
When the adapter device is connected to the power supply connection unit, the tool control unit is configured to operate until the motor reaches a predetermined number of rotations after the switch is started and operated than when the battery pack is connected. The power tool according to claim 5, wherein the increase in the rotational speed is slowed down.
The power tool according to any one of claims 1 to 6, wherein the tool control unit changes the condition of the abnormality determination according to which of the adapter device and the battery pack is connected to the power supply connection unit.
It has a current detection unit that detects the current flowing to the motor,
The power tool according to claim 7, wherein when the adapter device is connected to the power supply connection portion, at least one of the current threshold value and the time threshold value of the overcurrent protection is smaller than when the battery pack is connected. .
The power tool according to claim 8, wherein there are a plurality of combinations of current threshold and time threshold of over current protection, and the larger the current threshold, the smaller the time threshold.
10. The power supply side high temperature protection temperature threshold according to any one of claims 7 to 9, wherein when the adapter device is connected to the power supply connection part, the high temperature protection temperature threshold on the power supply side is higher than when the battery pack is connected. Electric tool.
The tool control unit determines which of the adapter device and the battery pack is connected to the power supply connection portion by communication with the adapter device or the battery pack connected to the power supply connection portion, and changes the control of the motor The electric power tool according to any one of claims 1 to 10.
Motor,
A tool control unit that controls the motor;
An adapter device connected to an AC power supply and a power supply connection portion capable of selectively connecting a battery pack;
The power supply connection unit is alternatively selected from a tool side abnormal signal terminal which is alternatively connected to an abnormal signal terminal for outputting an abnormal signal of the adapter device and the battery pack, and a communication terminal of the adapter device and the battery pack. And an electrically connected tool side communication terminal.
The power tool according to claim 12, wherein the communication terminal includes a temperature signal terminal, and the tool side communication terminal includes a tool side temperature signal terminal.
The power tool according to claim 13, wherein the tool control unit controls the motor based on temperature information input via the temperature signal terminal and the tool-side temperature signal terminal.