JP6874840B2 - Electric tool - Google Patents

Description

The present invention relates to an adapter device connected to an AC power supply and a power tool capable of selectively connecting a battery pack.

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

Japanese Unexamined Patent Publication No. 2001-179658

Since the adapter device and the battery pack have different surge voltage absorption capacities and current supply capacities, it is conceivable that problems may occur with the same control.

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

One aspect of the present invention is a power tool. This power tool
With the motor
A tool control unit that controls the motor and
It is equipped with an adapter device connected to an AC power supply and a power supply connection unit that can selectively connect a battery pack.
The tool control unit, either by the adapter device and the battery pack to the power supply connecting portion is connected to change the braking control of the motor.

A switch for instructing the start and stop of the motor is provided.
The tool control unit, when the adapter device to the power supply connecting portion is connected, without the brake control after the switch has been stop operation, when the battery pack to the power supply connecting portion is connected May perform brake control after the switch is stopped.

A switch that instructs the start and stop of the motor,
An inverter circuit that energizes the motor is provided.
The tool control unit, when the adapter device to the power supply connecting portion is connected, after the switch is stopped operating, performs brake control according to some of the short-circuit of the switching elements constituting the inverter circuit, If the battery pack to the power supply connecting portion is connected, after the switch has been stop operation may be performed brake control according to some of the PWM control of the switching elements constituting the inverter circuit.

Another aspect of the present invention is a power tool. This power tool
With the motor
A tool control unit that controls the motor and
A power supply connection that can selectively connect an adapter device and battery pack that are connected to an AC power supply,
And a switch for instructing start and stop of the motor,
The tool control unit changes the control of the motor depending on whether the adapter device or the battery pack is connected to the power supply connection unit.
The tool control section, when the adapter device is connected to the power connections, the than when the battery pack is connected, the motor reaches a predetermined rotational speed after the switch has been activated operation to slow the rotational speed increase up.

The tool control unit, the one is whether it is connected to the adapter device and the battery pack to the power supply connection portion, it may change the condition of the abnormality determination.

It has a current detection unit that detects the current flowing through the motor.
If the adapter is connected to the power connections, the than when the battery pack is connected, it may be smaller at least one current threshold and time threshold for overcurrent protection.
There are a plurality of combinations of the current threshold value and the time threshold value for overcurrent protection, and the larger the current threshold value, the smaller the time threshold value may be.
When the adapter device is connected to the power supply connection portion, the temperature threshold value for high temperature protection on the power supply side may be higher than when the battery pack is connected.

Another aspect of the present invention is a power tool. This power tool
With the motor
A tool control unit that controls the motor and
A power supply connection that can selectively connect an adapter device and battery pack that are connected to an AC power supply,
A current detection unit that detects the current flowing through the motor is provided.
The tool control unit changes the conditions for determining an abnormality depending on whether the adapter device or the battery pack is connected to the power supply connection unit.
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 that when the battery pack is connected.
There are a plurality of combinations of the current threshold value and the time threshold value for overcurrent protection, and the larger the current threshold value, the smaller the time threshold value.

Another aspect of the present invention is a power tool. This power tool
With the motor
A tool control unit that controls the motor and
It is equipped with an adapter device connected to an AC power supply and a power supply connection unit that can selectively connect a battery pack.
The tool control unit changes the conditions for determining an abnormality depending on whether the adapter device or the battery pack is connected to the power supply connection unit.
When the adapter device is connected to the power supply connection portion, the temperature threshold value for high temperature protection on the power supply side is higher than when the battery pack is connected.

The tool control unit discriminates either by communicating with the connected the adapter device or the battery pack to the power connecting portion of the adapter and the battery pack to the power supply connecting portion is connected, the motor You may change the control of.

Any combination of the above components and a conversion of the expression of the present invention between methods, systems and the like are also effective as aspects of the present invention.

According to the present invention, it is possible to provide a power tool capable of appropriate control depending on whether the adapter device or the battery pack is connected.

FIG. 5 is a plan sectional view of the power tool 1 according to the embodiment of the present invention in a state where the battery pack 20 is attached. Rear perspective view of the power tool 1. The perspective view of the battery pack 20 which can be attached to a power tool 1. FIG. 3 is a perspective view of an AC / DC power adapter 30 that can be attached to the power tool 1. Schematic block diagram of the power tool 1 and the battery pack 20. Schematic block diagram of the power tool 1 and the AC / DC power adapter 30. A table showing an example of the contents of the setting table for soft start in grinders and circular saws or desktop circular saws. A table showing an example of the contents of a setting table related to brake control in a grinder and a circular saw or a tabletop circular saw. A table showing an example of the contents of the setting table for overcurrent protection in the grinder. A table showing an example of the contents of the setting table for overcurrent protection in circular saws or desktop circular saws. A table showing an example of the contents of the setting table for voltage protection in the power tool 1. A table showing an example of the contents of the setting table for overheat protection in the power tool 1. The control flowchart of the power tool 1.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, processes, etc. shown in the drawings are designated by the same reference numerals, and redundant description will be omitted as appropriate. Moreover, the embodiment is not limited to the invention but is an example, and all the features and combinations thereof described in the embodiment are not necessarily essential to the invention.

FIG. 1 is a plan sectional view of the power tool 1 according to the embodiment of the present invention in a state where the battery pack 20 is attached. The front-back and left-right directions are defined with reference to FIG. FIG. 2 is a rear perspective view of the power tool 1. Although the power tool 1 is a grinder in the illustrated example, it may be another type such as a circular saw or a tabletop circular saw.

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

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

FIG. 3 is a perspective view of the battery pack 20 that can be attached to the power tool 1. FIG. 4 is a perspective view of the AC / DC power adapter 30 that can be attached to the power tool 1. The AC / DC power adapter 30 extends from a housing 33 having substantially the same shape as the housing of the battery pack 20 to a power cord 34 connected to a commercial power source, and converts an AC voltage into a DC voltage to be used as a power tool 1. Supply.

FIG. 5 is a schematic block diagram of the power tool 1 and the battery pack 20. FIG. 6 is a schematic block diagram of the power tool 1 and the AC / DC power adapter 30. In the power tool 1, the switching circuit 11 is, for example, an inverter circuit including switching elements such as six FETs and IGBTs connected by a three-phase bridge, and switches according to the control of the control circuit 10 to supply a drive current to the motor 6. To do. The control circuit 10 as a tool control unit includes a microcontroller (microcomputer) and the like, and when the switch 7 is turned on, the switching control of the switching circuit 11 is started to drive the motor 6. The control circuit 10 detects the current flowing through the motor 6 by the voltage across the shunt resistor R1 as the current detection unit. The control circuit 10 detects the input voltage from the power supply (battery pack 20 or AC / DC power adapter 30) connected to the power tool 1 by 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 by the voltage of the thermistor R2 as a temperature detecting element arranged in the vicinity of the switching circuit 11. The control circuit 10 receives a temperature signal and a motor stop signal from the power supply (battery pack 20 or AC / DC power supply adapter 30) connected to the electric tool 1 via the power supply connection unit 2a, and communicates with the power supply. To 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 supply control unit. The voltage across the battery cell 21 is output to the positive and negative terminals. The battery protection IC 22 monitors the voltage of each battery cell 21 and monitors the output currents 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 by the voltage of the thermistor R4 as a temperature detecting element arranged 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 an over-discharged state in which the voltage of at least one battery cell 21 is lowered below the threshold value, or is in an over-current state in which the main current from the plurality of battery cells 21 is larger than the threshold value. , A motor stop signal is transmitted to the control circuit 10 of the electric tool 1. The microcomputer 23 communicates with the power tool 1.

As shown in FIG. 6, the AC / DC power adapter 30 includes an AC / DC converter 31 and a microcomputer (adapter control unit) 32 as a power control unit. The AC / DC converter 31 converts the alternating current input from the alternating current power supply 40 into direct current and outputs it to the positive terminal and the negative terminal. The voltage of the thermistor R5 as a temperature detecting element arranged 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 electric tool 1 when an abnormality occurs. 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 for soft start in the grinding machine and the circular saw or the tabletop circular 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. In the setting tables of FIGS. 7 and 8, the setting values when the power tool 1 is a grinder and when it is a circular saw or a tabletop circular saw are shown together, but the control circuit 10 sets both. It is not necessary to memorize the value, and it is sufficient to memorize only the set value corresponding to the type of the power tool 1 on which the power tool 1 is mounted. As shown in FIG. 7, regardless of whether the power tool 1 is a grinder, a circular saw, or a tabletop circular saw, the voltage supply source (power supply connected to the power supply connection portion 2a) is an AC / DC power adapter. In the case of 30, the rotation speed increase speed until the motor 6 reaches a predetermined rotation speed after the switch 7 is turned on (starting operation) is smaller than in the case of the battery pack 20. This set value is because the AC / DC power adapter 30 has a lower current supply capacity than the battery pack 20, so that the rotation speed increase speed is increased in the start control of the motor 6 as in the case of the battery pack 20. This is because the current becomes overcurrent.

FIG. 8 is a table showing an example of the contents of the setting table related to brake control in the grinder and the circular saw or the tabletop circular saw. As shown in FIG. 8, when the power tool 1 is a grinder and 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 the PWM control of a part of the switching elements constituting the switching circuit 11 (hereinafter, "PWM brake control"). It is also written as), and it is a control that increases the duty of PWM control at 50% / sec. In the case of the battery pack 20, the surge voltage (regenerative energy) generated by the brake by PWM control can be absorbed by the battery cell 21, whereas in the case of the AC / DC power adapter 30, the value is set as such. This is because the surge voltage generated by the controlled brake cannot be absorbed, and there is a risk that the switching element constituting the switching circuit 11 will be damaged by the overvoltage. When the power tool 1 is a round saw or a desktop round 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. However, it is a short-circuit control of a part of the switching elements constituting the switching circuit 11 (hereinafter, also referred to as "short-circuit brake control").

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 the setting table for overcurrent protection in a circular saw or a tabletop circular saw. As shown in FIGS. 9 and 10, there are a plurality of combinations of the current threshold value and the time threshold value for overcurrent protection (four of conditions 1 to 4 in the illustrated example), and the larger the current threshold value, the smaller the time threshold value. As shown in FIG. 9, when the power tool 1 is a grinder, the current threshold value is obtained when the voltage supply source is the battery pack 20 and when the AC / DC power adapter 30 is used in all of the conditions 1 to 4. On the other hand, the time threshold is smaller when the voltage supply source is the AC / DC power adapter 30 than when the battery pack 20 is used. As shown in FIG. 10, when the power tool 1 is a round saw or a desktop round 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 as in the case of, the current threshold is smaller when the voltage supply source is the AC / DC power adapter 30 than when the battery pack 20 is used. For both the set values of FIGS. 9 and 10, the case where the voltage supply source is the AC / DC power adapter 30 is better in consideration of the fact that the AC / DC power adapter 30 has a lower current supply capacity than the battery pack 20. The overcurrent protection is applied with a smaller current threshold value or a smaller time threshold value than in the case of the battery pack 20.

FIG. 11 is a table showing an example of the contents of the setting table for voltage protection in the 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 having a nominal voltage of 3.6 V connected in series), 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) becomes 25V, that is, the voltage of the battery cell 21 becomes 2.5V, the control circuit 10 determines that the battery pack 20 has become over-discharged and stops the motor 6. On the other hand, when the power supply is the AC / DC power adapter 30, for example, when it is normal, the voltage of 36V is output like the battery pack 20, but the output voltage of the AC / DC power adapter 30 is increased due to a failure of the AC / DC converter 31 or the like. descend. When the output voltage of the AC / DC power adapter 30 reaches, for example, 20V, the control circuit 10 determines that the AC / DC power adapter 30 is abnormal and stops the motor 6. Further, when the current of the motor 6 becomes large, the voltage drop due to the internal resistance of the battery cell 21 or the AC / DC converter 31 becomes large, and the input voltage from the power supply connection portion 2a is greatly reduced. Therefore, in addition to the overcurrent protection shown in FIGS. 9 and 10, the motor 6 is stopped even when the input voltage drops below the threshold value. The table shown in FIG. 11 shows the threshold value 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 used. This takes into account that the AC / DC power adapter 30 has a lower current supply capacity than the battery pack 20, as well as the overcurrent protection threshold.

FIG. 12 is a table showing an example of the contents of the setting table for overheat protection in the power tool 1. The table shown in FIG. 12 shows the threshold value for activating the overheat protection (high temperature protection), and the threshold value on the power supply side is higher when the voltage supply source is the AC / DC power adapter 30 than when the battery pack 20 is used. It is a large value. This is because the AC / DC converter 31 is more resistant to high temperatures than the battery cell 21. The threshold value 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 the conditions when the battery pack 20 is connected from the 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 the various setting tables shown in FIGS. 7 to 12. (S4). The control circuit 10 soft-starts the motor 6 at a rotation speed increase speed set by the selected conditions (S5). The control circuit 10 detects the current value of the motor 6 (S6), and determines whether or not the current value and the duration 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 or not the voltage value satisfies the overdischarge determination condition (NO). S9). If the over-discharge determination condition is not satisfied (NO in S9), the control circuit 10 confirms whether or not a motor stop signal has been 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 or not the temperature of each part (battery cell 21, 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 off (NO in S12), the control circuit 10 continues to drive the motor 6 while checking for any abnormality (S6 to S11). .. When the overcurrent determination condition is satisfied (YES in S7), the overdischarge determination condition is satisfied (YES in S9), and the control circuit 10 receives the motor stop signal from the voltage supply source (YES in S10). ), When the overheat protection determination condition is satisfied (YES in S11), or when the switch 7 is turned off (YES in S12), the 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 when the voltage supply source is the battery pack 20, and natural deceleration when the voltage supply source is the AC / DC power adapter 30.

According to this embodiment, the following effects can be obtained.

(1) When the power tool 1 is a grinder, the control circuit 10 changes the brake control of the motor 6 depending on whether the AC / DC power adapter 30 or the battery pack 20 is connected to the power connection portion 2a. , Appropriate brake control according to the voltage supply source connected to the power supply connection unit 2a becomes possible. Specifically, when the AC / DC power adapter 30 is connected to the power connection unit 2a, the control circuit 10 does not perform brake control after the switch 7 is turned off, so that the surge voltage due to PWM brake control is used. The risk of damage to the switching element of the switching circuit 11 can be reduced. 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, so that the motor 6 is absorbed while the battery cell 21 absorbs the surge voltage. Can be stopped 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 whether the AC / DC power supply adapter 30 or the battery pack 20 is connected to the power supply connection unit 2a. Appropriate start control according to the voltage supply source becomes possible. Specifically, in the control circuit 10, when the AC / DC power adapter 30 is connected to the power connection unit 2a, the motor 6 is performed after the switch 7 is turned on, as compared with the case where the battery pack 20 is connected. Since the increase in the number of revolutions until the number reaches a predetermined number of revolutions is slowed down, the risk of the AC / DC power adapter 30 having a lower current supply capacity than the battery pack 20 becoming overcurrent can be suppressed.

(3) The control circuit 10 is connected to the power supply connection unit 2a in order to change the abnormality determination condition (threshold value) depending on whether the AC / DC power supply adapter 30 or the battery pack 20 is connected to the power supply connection unit 2a. Appropriate control (abnormality judgment) according to the supplied power supply becomes possible. Specifically, in the control circuit 10, when the AC / DC power adapter 30 is connected to the power connection unit 2a, the current threshold and the time threshold for overcurrent protection are higher than when the battery pack 20 is connected. In order to reduce at least one of the above, appropriate overcurrent protection according to the current supply capacity of the battery pack 20 and the AC / DC power adapter 30 becomes possible. Further, in the control circuit 10, when the AC / DC power adapter 30 is connected to the power connection portion 2a, the temperature threshold value of overheat protection (high temperature protection) on the power supply side is higher than when the battery pack 20 is connected. In order to increase the temperature, appropriate overheat protection according to the allowable temperature of the battery pack 20 and the AC / DC power adapter 30 becomes possible. Further, in the control circuit 10, when the AC / DC power adapter 30 is connected to the power connection unit 2a, the voltage threshold for over-discharge protection is made smaller than that when the battery pack 20 is connected, so that the battery Appropriate over-discharge protection according to the current supply capacity of the pack 20 and the AC / DC power adapter 30 is possible.

(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 communicating with the voltage supply source connected to the power supply connection unit 2a. , Appropriate control according to the voltage supply source connected to the power supply connection unit 2a becomes possible. 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 depending on whether or not communication is possible.

Although the present invention has been described above by taking the embodiment as an example, it will be 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. By the way. Hereinafter, a modified example will be touched.

Even when the power tool 1 is a circular saw or a desktop circular saw, the control circuit 10 brakes the motor 6 depending on whether the AC / DC power adapter 30 or the battery pack 20 is connected to the power connection portion 2a. The control may be changed. Further, when the AC / DC power adapter 30 is connected to the power connection unit 2a, short-circuit brake control may be used, and when the battery pack 20 is connected, PWM brake control may be used. Since there is no problem of surge voltage in the case of short-circuit brake control, it can also be used when the AC / DC power adapter 30 is used as a power source. 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 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 need to have a communication function. Further, the threshold values in FIGS. 7 to 12 may be reversed or the same for the battery pack 20 and the AC / DC power adapter 30 depending on the specifications of the components constituting the AC / DC converter 31. The power tool of the present invention is not limited to the grinding machine, circular saw, and tabletop circular saw exemplified in the embodiment, and may be other types.

1 ... Electric tool, 2 ... Housing, 2a ... Power connection, 4 ... Gear case, 6 ... Motor, 7 ... Switch, 7a ... Operation unit, 9 ... Grindstone (rotary tool), 10 ... Control circuit (tool control unit), 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 (11)

With the motor
A tool control unit that controls the motor and
It is equipped with an adapter device connected to an AC power supply and a power supply connection unit that can selectively connect a battery pack.
The tool control unit, either by the adapter device and the battery pack to the power supply connecting portion is connected to change the braking control of the motor, the power tool. A switch for instructing the start and stop of the motor is provided.
The tool control unit, when the adapter device to the power supply connecting portion is connected, without the brake control after the switch has been stop operation, when the battery pack to the power supply connecting portion is connected performs brake control after the switch has been stopped operated power tool of claim 1. A switch that instructs the start and stop of the motor,
It is provided with an inverter circuit that energizes the motor.
The tool control unit, when the adapter device to the power supply connecting portion is connected, after the switch is stopped operating, performs brake control according to some of the short-circuit of the switching elements constituting the inverter circuit, If the battery pack to the power supply connecting portion is connected, after the switch is stopping operation, a breaking operation is executed in accordance with some PWM control of the switching elements constituting the inverter circuit, according to claim 1 Power tools. With the motor
A tool control unit that controls the motor and
A power supply connection that can selectively connect an adapter device and battery pack that are connected to an AC power supply,
And a switch for instructing start and stop of the motor,
The tool control unit changes the control of the motor depending on whether the adapter device or the battery pack is connected to the power supply connection unit.
The tool control section, when the adapter device is connected to the power connections, the than when the battery pack is connected, the motor reaches a predetermined rotational speed after the switch has been activated operation to slow the rotational speed increase of up to, electrostatic dynamic tool. The tool control unit, the one is whether it is connected to the adapter device and the battery pack to the power supply connecting portion, changes the condition of the abnormality determination, the power tool according to any one of claims 1 4 .. It has a current detection unit that detects the current flowing through the motor.
If the adapter is connected to the power connections, the than when the battery pack is connected, at least one current threshold and time threshold for overcurrent protection is small, according to claim 5 Electric tool. The power tool according to claim 6 , wherein there are a plurality of combinations of a current threshold value and a time threshold value for overcurrent protection, and the larger the current threshold value is, the smaller the time threshold value is. If the adapter is connected to the power connections, the than when the battery pack is connected, the temperature threshold of the hot protective power side is higher, in any one of claims 5 to 7 The power tool described. With the motor
A tool control unit that controls the motor and
A power supply connection that can selectively connect an adapter device and battery pack that are connected to an AC power supply,
A current detection unit that detects the current flowing through the motor is provided.
The tool control unit changes the conditions for determining an abnormality depending on whether the adapter device or the battery pack is connected to the power supply connection unit.
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 that when the battery pack is connected.
A power tool in which there are a plurality of combinations of a current threshold value and a time threshold value for overcurrent protection, and the larger the current threshold value is, the smaller the time threshold value is. With the motor
A tool control unit that controls the motor and
It is equipped with an adapter device connected to an AC power supply and a power supply connection unit that can selectively connect a battery pack.
The tool control unit changes the conditions for determining an abnormality depending on whether the adapter device or the battery pack is connected to the power supply connection unit.
A power tool having a higher temperature threshold for high temperature protection on the power supply side when the adapter device is connected to the power supply connection portion than when the battery pack is connected. The tool control unit discriminates either by communicating with the connected the adapter device or the battery pack to the power connecting portion of the adapter and the battery pack to the power supply connecting portion is connected, the motor The power tool according to any one of claims 1 to 6 , which changes the control of the power tool.

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