Abstract: A 36V electrical apparatus is mountable with both an 18V/36V switchable battery pack and an 18V battery pack. In the case where the 18V/36 V battery pack is connected to the 36V electrical apparatus, first switches are turned off and a second switch is turned on to connect the battery pack in series (36V output). In the case where the 18V battery pack is connected to the 36V electrical apparatus, the first switches are turned on and the second switch is turned off to generate an 18V output, thus making it possible to mount the 18V battery pack to the 36V electrical apparatus. Furthermore, the voltage of the mounted battery pack is determined by a microcomputer, and a motor is set to a star connection by switches in the case of 36V, and to a delta connection in the case of 18V.

Abstract: An electrical device body connectable to a battery pack, includes a drive part, and a terminal part. The terminal part having a positive input terminal electrically connected to the drive part, a negative input terminal electrically connected to the drive part, and a short circuit element having a first terminal part, a second terminal part, and a connection part connecting the first terminal part and the second terminal part, wherein the positive input terminal and the negative input terminal are disposed on an upper side of the terminal part and the short circuit element is disposed on a lower side of the terminal part in an upper-lower direction, the positive input terminal and the negative input terminal being apart from each other in a left-right direction crossing the upper-lower direction.

Abstract: A battery pack houses first and second cell units that are composed of a plurality of cells, and has a positive electrode power source terminal and a negative electrode power source terminal. This battery pack is provided with a series connector capable of connecting, in series, the first and second cell units and a parallel connector capable of connecting, in parallel, the first and second cell units, and is capable of switching between a parallel connection voltage and a series connection voltage. In the case of attachment to the high voltage electrical device body, the series connector becomes conductive and the parallel connector pair is cut off by the action of the series/parallel switching terminal. In the case of attachment to a low voltage electrical device body, the state is returned to an initial state, the series connector is cut off, and the parallel connector pair becomes conductive.

Abstract: In order that the output voltage of a battery pack can be switched and the battery pack can be shared among different voltage electric appliances, this battery pack has a switching mechanism that switches outputting a low voltage by parallel connection of two cell units or outputting a high voltage by series connection of the two cell units, said two cell units each being composed of a plurality of cells connected in series, wherein the switching mechanism is configured from a change-over switch having an operation lever (452). The change-over switch is embedded in a battery pack (400), and an operator is able to manually switch outputting 18 V by setting the operation lever (452) at a first position or outputting 36 V by setting the operation lever (452) at a second position.

Abstract: In an upper cell unit (2146) and a lower cell unit (2147) comprising five battery cells, positive electrode terminals (2162, 2172) are set apart and aligned vertically, and negative electrode terminals (2167, 2177) are set apart and aligned vertically. When an electrical device body is rated at 36V, device-side terminals are in contact only at the upper terminals (2162, 2167), and short circuiting of the lower terminals (2172, 2177) is effected using a short bar 2059. When the electrical device body is rated at 18V, the upper and lower terminals (2162 and 2172, 2167 and 2177) are simultaneously made to contact the device-side terminals, and the upper cell unit (2146) and the lower cell unit (2147) assume a parallel connected state. Thus, it is possible to automatically switch the output voltage when a battery pack is mounted according to the difference in terminal shape on the electrical device body side.

Abstract: When a main switch (12) is turned ON, an electric operating machine (1) is put in the standby mode. With a trigger (13) being pulled in the standby mode, a power supply circuit (16) applies a voltage to a drive part (30). The power supply circuit (16) adjusts the voltage applied to the drive part (30) for a voltage corresponding to the pulling rate of the trigger (13). When the current running toward the drive part (30) exceeds the rated value of the drive part (30), the power supply circuit (16) automatically stops power supply to the drive part (30). On the other hand, when the output voltage of a battery (50) drops and the battery (50) is put in an overdischarge state, power supply to the drive part (30) is automatically stopped. When it is detected that the battery (50) undergoes an abnormal event, power supply to the drive part (30) is automatically stopped.

Abstract: An electric tool including a motor configured to be driven by a PWM control of a semiconductor switching element by using a power supply, a power transmission mechanism configured to transmit a rotation of the motor to an end tool, and a controller configured to control a rotation of the motor by a duty ratio of a PWM signal, wherein the controller is configured to set the duty ratio to a reference duty ratio less than 100% when a voltage of the power supply applied to the electric tool is within a predetermined range including a rated voltage of the electric tool, and wherein the controller is configured to drive the motor by setting the duty ratio to be higher than the reference duty ratio when the voltage of the power supply applied to the electric tool is lower than the predetermined range.

Abstract: In order that the output voltage of a battery pack can be switched and the battery pack can be shared among different voltage electric appliances, this battery pack has a switching mechanism that switches outputting a low voltage by parallel connection of two cell units or outputting a high voltage by series connection of the two cell units, said two cell units each being composed of a plurality of cells connected in series, wherein the switching mechanism is configured from a change-over switch having an operation lever (452). The change-over switch is embedded in a battery pack (400), and an operator is able to manually switch outputting 18 V by setting the operation lever (452) at a first position or outputting 36 V by setting the operation lever (452) at a second position.

Abstract: A battery pack houses first and second cell units that are composed of a plurality of cells, and has a positive electrode power source terminal and a negative electrode power source terminal. This battery pack is provided with a series connector capable of connecting, in series, the first and second cell units and a parallel connector capable of connecting, in parallel, the first and second cell units, and is capable of switching between a parallel connection voltage and a series connection voltage. In the case of attachment to the high voltage electrical device body, the series connector becomes conductive and the parallel connector pair is cut off by the action of the series/parallel switching terminal. In the case of attachment to a low voltage electrical device body, the state is returned to an initial state, the series connector is cut off, and the parallel connector pair becomes conductive.

Abstract: In an upper cell unit (2146) and a lower cell unit (2147) comprising five battery cells, positive electrode terminals (2162, 2172) are set apart and aligned vertically, and negative electrode terminals (2167, 2177) are set apart and aligned vertically. When an electrical device body is rated at 36V, device-side terminals are in contact only at the upper terminals (2162, 2167), and short circuiting of the lower terminals (2172, 2177) is effected using a short bar 2059. When the electrical device body is rated at 18V, the upper and lower terminals (2162 and 2172, 2167 and 2177) are simultaneously made to contact the device-side terminals, and the upper cell unit (2146) and the lower cell unit (2147) assume a parallel connected state. Thus, it is possible to automatically switch the output voltage when a battery pack is mounted according to the difference in terminal shape on the electrical device body side.

Abstract: A power tool includes: a secondary battery; a drive unit; a detecting unit; and a control unit. The secondary battery has positive and negative terminals across which a battery voltage is developed. The drive unit is connected to the secondary battery. The detecting unit is configured to detect a current value and a voltage value supplied from the secondary battery to the drive unit. The control unit is configured to control an effective voltage and an effective current applied to the drive unit depending on a load imposed thereon to fall within an allowable power dissipation value.

Abstract: A power tool includes a motor and control means for controlling the motor. The motor is capable of being driven by power supplied from a battery pack including a battery cell. The control means is configured to continue to rotate the motor even when a motor-halt signal is inputted from the battery pack. With this structure, the power tool can be used continuously without need to halt rotation of the motor, even when receiving a halt signal, such as an overdischarge detection signal or an overcurrent detection signal.

Abstract: The purpose of the present invention is to use a motor with as high an output as possible to complete tightening operations at a high speed while limiting continuous drive output. In a power tool having a plurality of impact operation modes, the motor thereof is controlled at a 100% duty cycle so as to rotate at a high speed in the period between pulling of a trigger and starting of an impact operation (71a-71b), and the duty cycle is changed to a low duty cycle matching the appropriate operation mode after an impact by an impact mechanism is started and a predetermined stroke is performed so that the motor is driven at the low duty cycle until the trigger is returned (arrow 71c-71d). The switching of the duty cycle is performed when the current flowing to the motor exceeds a threshold (I1).

Abstract: An electric tool includes: a motor configured to be driven by PWM controlling a semiconductor switching element; a trigger configured to adjust startup and rotation of the motor; a changeover switch configured to switch a rotation direction of the motor between a forward rotation and a reverse rotation; a power transmission mechanism configured to rotate a tip tool by the motor, and a controller configured to control rotation of the motor. When the reverse rotation is set by the changeover switch, the controller PWM controls the semiconductor switching element at a high duty ratio after the trigger is pulled to drive the motor, and thereafter drives the motor at a state where the high duty ratio is changed to a low duty ratio.

Abstract: The present invention reduces or shuts off output electric power of a battery pack, which is connected to an electric device, depending on an abnormality. According to the present invention, a battery pack is detachably connected to an electric-device main body having a switch, and includes a first electric-power control circuit that outputs a first signal to the electric-device main body when the switch is operated, the first signal for allowing supply of electric power to the electric-device main body, a second switching element provided on an electric-power supply path that supplies electric power to the electric-device main body, and a second electric-power control circuit that outputs a second signal to the second switching element if an abnormality occurs in the battery pack, the second signal for reducing or shutting off the electric power supplied to the electric-device main body.

Abstract: A power tool includes a motor and control means for controlling the motor. The motor is capable of being driven by power supplied from a battery pack including a battery cell. The control means is configured to continue to rotate the motor even when a motor-halt signal is inputted from the battery pack. With this structure, the power tool can be used continuously without need to halt rotation of the motor, even when receiving a halt signal, such as an overdischarge detection signal or an overcurrent detection signal.

Abstract: When a main switch (12) is turned ON, an electric operating machine (1)is put in the standby mode. With a trigger (13) being pulled in the standby mode, a power supply circuit (16) applies a voltage to a drive part (30). The power supply circuit (16) adjusts the voltage applied to the drive part (30) for a voltage corresponding to the pulling rate of the trigger (13). When the current running toward the drive part (30) exceeds the rated value of the drive part (30), the power supply circuit (16) automatically stops power supply to the drive part (30). On the other hand, when the output voltage of a battery (50) drops and the battery (50) is put in an overdischarge state, power supply to the drive part (30) is automatically stopped. When it is detected that the battery (50) undergoes an abnormal event, power supply to the drive part (30) is automatically stopped.

Abstract: In order to increase the screw tightening speed and improve the work efficiency, three first pawls 30e of a hammer 30 and three second pawls 18d of an anvil 18 are provided, so that a striking interval can be set to “interval of 120 degrees”, which is shorter than that of the related art. By setting total inertia obtained by sum of inertia of a rotor 12b and inertia of a spindle 26 to a low value which is “300 kg·mm2” or less when converted in terms of a rotation axis of the spindle 26, the rotor 12b and the spindle 26 can be sufficiently accelerated and the work efficiency can be improved.

Abstract: A high-pressure washing machine is provided, which can stop a brushless motor even if the function of a microcomputer declines. The high-pressure washing machine is provided as a high-pressure washing machine 10 having a pump 12 which sucks and discharges a washing solution and a brushless motor 14 supplied with current to drive the pump 12. The high-pressure washing machine 10 includes an inverter circuit 29 which when the pump 12 driven by power from the brushless motor 14 discharges the washing solution, controls the rotation speed of the brushless motor 14, a driver circuit 30, a microcomputer 31, and a motor operation stopping circuit 37 which detects the discharge pressure of the pump 12 and which based on the result of the detection, switches on and off an electric circuit E1, which supplies current to the brushless motor 14.

Abstract: According to an aspect of the present invention, there is provided an impact tool including: a motor; a hammer connected to an output portion of the motor; and an anvil to be struck by the hammer in a rotation direction and having a rotary shaft, the hammer striking the anvil in the rotation direction by driving the motor in pulses, wherein the anvil is provided in front of the hammer, wherein the hammer is driven in pulses by the motor, and wherein a rotation angle of the hammer is substantially proportional to a rotation angle of the motor.