CN111491763B - Electric tool, control circuit of electric tool and control method - Google Patents
Electric tool, control circuit of electric tool and control method Download PDFInfo
- Publication number
- CN111491763B CN111491763B CN201880081595.4A CN201880081595A CN111491763B CN 111491763 B CN111491763 B CN 111491763B CN 201880081595 A CN201880081595 A CN 201880081595A CN 111491763 B CN111491763 B CN 111491763B
- Authority
- CN
- China
- Prior art keywords
- electric motor
- control circuit
- rotation
- electric
- information storage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Electric Motors In General (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
The invention aims to prevent data stored in an information storage unit from being damaged due to counter electromotive force generated by an electric motor. The electric screwdriver is provided with: the electric motor includes an electric motor, a hall sensor that detects rotation of the electric motor and transmits a rotation detection signal, and a memory that stores setting data related to control of the electric motor. When a voltage is applied to a control circuit of an electric screwdriver and the control circuit is activated (S100), the rotation of an electric motor is detected by a Hall sensor, and a memory is not accessed when the electric motor is rotated (S104). When the electric motor is stopped for a predetermined reference time (100 ms) or longer, access to the memory is permitted (S106, S108).
Description
Technical Field
The present invention relates to a control circuit for an electric power tool including an electric motor, and a control method for the electric power tool.
Background
For example, patent document 1 discloses an electric screwdriver in which a screwdriver bit is rotationally driven by an electric motor to perform a screw tightening operation. In such an electric screwdriver, it is common to allow a user to change settings such as tightening torque and tightening time in accordance with the type of screw and the member to which the screw is tightened. Therefore, the electric screwdriver is provided with an information storage unit for recording setting data in advance. The information storage unit is often constituted by a semiconductor memory that can be read and written. When the electric screwdriver is connected to an external power supply and a voltage is applied to a control circuit of the electric screwdriver, the control circuit automatically starts up to initialize the electric screwdriver and set control conditions of the electric screwdriver based on setting data. When such initial setting is completed, the screw tightening operation can be performed in accordance with the user operation.
In the electric tool including the electric motor such as the electric screwdriver, even in a state where the electric tool is not connected to an external power source, if the electric motor is rotated by an external force, a counter electromotive force is generated, and a voltage is applied to the control circuit. Thus, when a voltage of a magnitude sufficient to activate the control circuit is applied to the control circuit, the control circuit may be activated to initialize the electric power tool and set the control conditions. The back electromotive force of the electric motor is unstable and is temporarily generated, and therefore, the supply of electric power to the control circuit based on the back electromotive force is unstable. Therefore, in general, the control circuit becomes immediately stopped even upon start-up. Therefore, when the control circuit is activated by the counter electromotive force, the control circuit may be stopped while accessing the information storage means such as the memory in which the setting data is recorded. When the control circuit is suddenly stopped during access to the memory, data such as setting data stored in the information storage unit may be destroyed.
In order to prevent such data destruction, a diode is disposed between the electric motor and the control circuit so that a current caused by a counter electromotive force of the electric motor does not flow through the control circuit and the control circuit is not activated by the counter electromotive force.
Prior art documents
Patent literature
Patent document 1: international publication No. 2017/170648
Disclosure of Invention
Problems to be solved by the invention
For example, in the electric screwdriver described above, since the tightening torque of the screw is substantially proportional to the magnitude of the current flowing through the electric motor, if the tightening torque is increased, a large current flows through the electric motor. The diode for preventing the counter electromotive force from being applied to the control circuit needs to be a large-capacity diode that can withstand such a large current, but obtaining such a diode is difficult or becomes large-sized even if obtained, and the electric screwdriver itself must be enlarged.
Accordingly, an object of the present invention is to provide a control circuit for an electric power tool, which can prevent data stored in an information storage unit from being destroyed by a counter electromotive force generated by an electric motor without adding a current control circuit element such as a diode. Another object of the present invention is to provide an electric power tool including such a control circuit and a control method of the electric power tool capable of preventing data destruction.
Means for solving the problems
That is, the present invention provides a control circuit for an electric power tool, including: the electric motor, detect the rotation of the electric motor and send the rotation detection unit of the rotation detection signal, and keep the information memory cell of the settlement data related to control of the electric motor, wherein, when applying the voltage to the control circuit, judge whether the electric motor rotates according to the rotation detection signal, set as not visiting the information memory cell when the electric motor rotates.
In this control circuit, the information storage unit is not accessed when the electric motor is rotated when a voltage is applied to the control circuit. When the electric motor rotates at a time point when a voltage is applied to the control circuit, the electric motor rotates by an external force to generate a counter electromotive force, and the control circuit is likely to be activated by applying a voltage to the control circuit by the counter electromotive force. In this control circuit, the information storage unit is not accessed when the control circuit is highly likely to be activated by the back electromotive force. This can prevent the following: when the control circuit is temporarily started by the back electromotive force of the electric motor and accesses the information storage unit, the control circuit is stopped, and thus data such as setting data stored in the information storage unit is destroyed.
Preferably, when it is determined that the time during which the rotation of the electric motor is stopped is equal to or longer than a predetermined reference time, the access to the information storage unit is permitted.
By doing so, it is possible to detect the state in which the rotation of the electric motor is stopped more reliably, and to access the information storage means only in a safer state. As the rotation detecting means, various rotation detecting means such as a hall sensor and an encoder are considered, and there is also a rotation detecting means that emits a signal only when the rotation shaft of the electric motor passes a predetermined rotational position. In the case of such a means, the signal indicating the rotation of the electric motor is transmitted only in a pulse manner, and thus, even if the electric motor rotates, a time when the control circuit does not receive the signal occurs. According to the above configuration, even in such a case, it is possible to more accurately determine that the rotation of the electric motor is stopped, thereby more reliably preventing access to the information storage unit despite the electric motor being erroneously determined to be stopped while rotating.
Preferably, when the stop time is equal to or longer than the reference time, the control device accesses the information storage unit to read the setting data, and sets the control condition of the electric power tool based on the read setting data.
In addition, when access to the information storage unit is once permitted, the state in which access to the information storage unit is permitted regardless of the rotation of the electric motor can be maintained thereafter.
Specifically, the information storage means may be a memory that can be read and written.
The present invention further provides an electric power tool including:
an electric motor;
a rotation detection unit that detects rotation of the electric motor and transmits a rotation detection signal;
an information storage unit that stores setting data related to control of the electric motor; and
the control circuit of any of the above.
The present invention further provides a control method for an electric power tool, the electric power tool including: an electric motor, a rotation detecting means for detecting rotation of the electric motor and transmitting a rotation detection signal, an information storing means for storing setting data relating to control of the electric motor, and a control circuit, wherein the control circuit comprises:
detecting rotation of the electric motor by the rotation detecting unit when a voltage is applied to the control circuit; and
it is provided that the information storage unit is not accessed when the electric motor is rotated.
In the method, the setting may further include:
timing a time during which rotation of the electric motor is stopped;
accessing the information storage unit to read the setting data when the stop time is equal to or longer than the reference time;
setting control conditions of the electric tool according to the read setting data; and
after the setting step, the access to the information storage unit is permitted regardless of whether the electric motor is rotating.
Hereinafter, an embodiment of an electric power tool according to the present invention will be described with reference to the drawings.
Drawings
Fig. 1 is an external view of an electric screwdriver according to embodiment 1 of the present invention.
Fig. 2 is a functional block diagram of the electric screwdriver of fig. 1.
Fig. 3 is a diagram showing another embodiment of the rotation detecting unit.
Fig. 4 is a flowchart showing an operation at the time of starting the electric screwdriver of fig. l.
Fig. 5 is an external view of an electric driver according to embodiment 2 of the present invention.
Fig. 6 is a functional block diagram of the electric screwdriver of fig. 5.
Fig. 7 is a flowchart showing an operation at the time of starting in the electric screwdriver of fig. 5.
Detailed Description
As shown in fig. 1 and 2, an electric driver (electric tool) 100 according to embodiment 1 of the present invention includes: a tool case 110, an electric motor 112 built in the tool case 110, and a head holder 114 rotationally driven by the electric motor 112. A driver bit 116 appropriately selected in accordance with the target screw is detachably attached to the bit holder 114. The tool housing 110 is provided with: an input interface 122 having a display portion 118 and an input button 120, and a power supply line 124 for connecting the electric screw driver 100 to an external power supply 123. Inside the tool housing 110, there are further provided: a motor drive circuit 126 for controlling the drive of the electric motor 112, a control circuit 128 for controlling the entire electric screwdriver 100, a hall sensor 130 for detecting the rotational position of the rotor of the electric motor 112, and a nonvolatile semiconductor memory (information storage means) 132 in which setting data is stored and which can be read and written. Further, although not shown in the drawings, there are a program memory that stores a control program in advance at the manufacturing stage, and a data memory and a register (register memory) that are used when the control circuit 128 executes the control program. The program memory is used as a read only memory in addition to a special situation such as updating of a program, and basically does not allow a user to write data or delete data. The data memory and the register are volatile memories that are used only during execution of the control program and erase internal data when the power supply is stopped.
Here, the "setting data" mainly refers to data for setting settings related to control of the electric motor 112, and is, for example, data for setting a set torque at the time of a screw tightening operation, a rotation time of the electric motor 112, the number of screws to be tightened, a pass standard at the time of determining that the screw tightening operation has been normally ended, or the like. The user can arbitrarily change the setting data by operating the input interface 122 or by transmitting data from an external device such as a personal computer. The changed setting data is written into the memory 132 and stored therein.
The hall sensor 130 is fixed to the stator side of the electric motor 112, and detects a magnetic field generated by a magnet provided in the rotor, thereby detecting the rotational position of the rotor. The rotor is smoothly rotated by controlling the timing of energization to each coil of the stator based on the rotational position of the rotor detected by the hall sensor 130. In the electric screwdriver 100, the control circuit 128 receives an output signal from the hall sensor 130, and determines whether or not the electric motor 112 is rotating based on the output signal. That is, the hall sensor 130 also functions as a rotation detection unit for detecting the rotation of the electric motor 112. The control circuit 128 determines that the rotation of the electric motor 112 is stopped when there is no change in the output signal (rotation detection signal), and determines that the electric motor 112 is rotating when there is a change in the output signal.
As the rotation detecting means for detecting the rotation of the electric motor 112, any rotation detecting means other than the hall sensor 130 can be used. For example, fig. 3 shows an embodiment in which a resistance element 136 is connected to each wiring 134 that is connected to each coil of the electric motor 112. In this embodiment, the current flowing through the wiring 134 is detected by detecting a voltage change in each resistance element 136. When a current flows through the wiring 134, it is considered that the current is supplied to the electric motor 112 according to a control program to rotationally drive the electric motor 112, or that the electric motor 112 is rotated by an external force to generate a counter electromotive force. In any case, the electric motor 112 is highly likely to rotate in a state where a current is generated in the wiring 134. By detecting the voltage change between the resistance elements 136, the presence or absence of rotation of the electric motor 112 can be detected. Further, in the illustrated example, the electric motor 112 is a three-phase motor, but may be a single-phase motor. Alternatively, a torque sensor may be disposed on the rotation shaft of the electric motor 112 or a rotation mechanism for transmitting power from the rotation shaft to the driver bit 116, and when the torque sensor detects a change in torque, it may be determined that the electric motor 112 is rotating. Further, the rotation detection may be performed by an encoder. The rotation detecting means in the present invention can be implemented by various devices as described above, and may be implemented by any other means based on any other detection principle within the scope not departing from the object of the present invention.
The operation (control method) of the electric driver 100 at the time of activation will be described below with reference to fig. 4. When a voltage is applied to the control circuit 128, the control circuit 128 is activated to perform initial setting. Specifically, when the control circuit 128 is started (S100), the initialization is first performed (S102). Here, the initialization means, for example, an operation to read a control program from a program memory or store necessary data in a data memory or a register to execute a state of the control program. Next, it is determined whether or not the electric motor 112 is rotating, based on the rotation detection signal transmitted from the hall sensor 130 (S104). Specifically, if there is no change in the rotation detection signal, it is determined that the electric motor 112 is stopped, and if there is a change, it is determined that the electric motor 112 is rotating. When the electric motor 112 rotates, the electric motor 112 stands by until it stops. When the electric motor 112 is stopped, the time for which the electric motor 112 is stopped is measured (S106), and the electric motor is kept on standby until the stop time reaches a predetermined reference time (100 ms in the present embodiment). When the stop time is equal to or longer than the reference time, the access to the memory 132 is started to read the setting data (S108), and the control condition of the electric driver 100 is set based on the read setting data (S110). At this time, data indicating the number of times of activation is written in the memory 132. When the setting is normally finished (S112), a series of initial settings are finished, and the screw tightening operation by the user operation can be executed (S114).
In the electric driver 100, as described above, when a voltage is applied to the control circuit 128, the initial setting is automatically performed. The voltage is applied to the control circuit 128 usually when the electric screwdriver 100 is connected to the external power supply 123 to be supplied with electric power from the external power supply 123. At this time, since the electric motor 112 is not normally rotated, the setting based on the setting data is permitted by allowing access to the memory 132 in accordance with the flowchart of fig. 4. On the other hand, in a state where the electric screwdriver 100 is not connected to the external power supply 123, when the electric motor 112 is rotated by an external force by rotating the screwdriver bit 116 by hand or the like, a counter electromotive force is generated in the electric motor 112, and a current flows from the electric motor 112 to the control circuit 128, so that a voltage is applied to the control circuit 128. At this time, if a voltage of a magnitude necessary for activation is applied to the control circuit 128, the control circuit 128 is activated. In general, the control circuit 128 is immediately stopped even when it is started because the back electromotive force of the electric motor 112 is generated for a short time of several seconds or less in many cases. Therefore, if the memory 132 is accessed while the control circuit 128 is temporarily activated by the back electromotive force, the possibility that the control circuit 128 is stopped due to the power supply being lost during the access is high. If the control circuit 128 is stopped during access to the memory 132, particularly during writing of data into the memory 132, data such as setting data stored in the memory 132 may be destroyed. In the electric driver 100, as described above, the rotation of the electric motor 112 is monitored by the hall sensor 130, and when the electric motor 112 rotates, the electric driver stands by until the rotation stops. Thus, when the control circuit 128 is activated by the counter electromotive force accompanying the rotation of the electric motor 112, the memory 132 is not accessed. That is, in the electric screw driver 100, since the memory 132 is accessed only when stable power supply from the external power supply 123 is performed, it is possible to reduce the possibility of the setting data in the memory 132 being destroyed due to the stop of the control circuit 128 while the control circuit 128 is accessing the memory 132. The program memory, the data memory, and the register are also accessible when activated by the back electromotive force in the initialization step (S102), but since the program memory is read-only and data is not written at the time of activation, the possibility of data destruction due to the stop of the control circuit 128 is low, and the data in the data memory and the register is originally data that is deleted when the power supply is stopped, and therefore, there is no problem even if the data stored there is damaged.
In the electric driver 100, access to the memory 132 is not permitted immediately after it is determined that rotation of the electric motor 112 is stopped, but is permitted after it is confirmed that the electric motor 112 is stopped for a predetermined reference time (100 ms) or more. It is also considered that when the electric motor is rotated by an external force, the rotation of the electric motor is not continuously performed but is temporarily stopped and then immediately rotated again. As described above, various rotation detecting means can be used as the rotation detecting means, and there are rotation detecting means that transmits a signal only when the rotor is at a predetermined rotational position, and when such rotation detecting means is used, there is a possibility that the electric motor 112 actually rotates even if the rotation detecting signal is not transmitted. By setting such a given reference time as described above, it can be determined more reliably that the electric motor 112 is stopped, and thus, access to the memory 132 at the time of starting based on the counter electromotive force can be prevented more reliably.
In a state where the initial setting is completed after the access to the memory 132 is permitted, the possibility that the electric power supply to the electric screwdriver 100 is performed by the stable external power supply 123 is high, and therefore, the possibility that the electric power supply is stopped in an emergency during the access to the information storage unit is extremely low. Therefore, once the access to the memory 132 is permitted, the state is set to a state in which the access to the memory 132 is permitted at an arbitrary timing regardless of the rotation of the electric motor 112, and this state is maintained.
As shown in fig. 5 and 6, the electric driver 200 according to embodiment 2 of the present invention is composed of an electric driver main body 202 and a controller 204 for controlling the electric driver main body. The electric screwdriver body 202 and the controller 204 are connected by the communication cable 206 via communication units 238a and 238b provided in the respective units. A power supply line 224 connected to an external power supply 223 is provided on the controller 204 side, and power is supplied from the external power supply 223 to the electric screwdriver body 202 from the controller 204 via the communication cable 206. As shown in fig. 6, an electric motor 212, a motor drive circuit 226, and a hall sensor 230 similar to the electric screwdriver 100 according to embodiment 1 are provided in the tool case 210 of the electric screwdriver body 202. The input interface 222 is provided on the controller 204 side.
In the electric screwdriver 200, the electric screwdriver body 202 and the controller 204 are provided with control circuits 228a and 228b, respectively. The two control circuits 228a and 228b communicate with each other via the communication cable 206, and the two control circuits 228a and 228b realize the same functions as those of the control circuit 128 in embodiment 1. Similarly, the electric screwdriver body 202 and the controller 204 are provided with memories 232a and 232b, respectively, and the two memories 232a and 232b realize the same functions as the memory 132 in embodiment 1.
When a voltage is applied to the control circuits 228a and 228b, the control circuits 228a and 228b are activated and initialized, respectively, as shown in fig. 7. Specifically, when the control circuit 228a on the electric screwdriver body 202 side is activated (S200), initialization is first performed (S202). Next, it is determined whether or not the electric motor 212 is rotating based on the rotation detection signal from the hall sensor 230 (S204). When the electric motor 212 is not stopped, the standby is performed until the electric motor 212 is stopped. When the electric motor 212 is stopped, the time when the electric motor 212 is stopped is measured (S206). The standby is performed until the stop time reaches a given reference time (100 ms in the present embodiment). When the stop time is equal to or longer than the reference time, a normal start signal is transmitted to the control circuit 228b on the controller 204 side (S208).
When the control circuit 228b on the controller 204 side receives the normal start signal (S252) after the start (S250), it accesses the memory 232b to read the setting data (S254), and transmits the read setting data to the control circuit 228a on the electric screwdriver main body 202 side (S256). Upon receiving the setting data (S210), the control circuit 228a on the electric screwdriver body 202 side sets the control conditions of the electric screwdriver 200 based on the received setting data (S212). At this time, the setting data is written in the memory 232 a. Next, it is determined whether or not the setting is normally ended (S214), and if the setting is normally ended, the OK signal is transmitted to the control circuit 228b on the controller 204 side (S216), and if the setting is not normally ended, the NG signal is transmitted to the control circuit 228b on the controller 204 side (S218). When the OK signal is transmitted, the initial setting on the electric driver main body 202 side is completed, and the screw tightening operation is enabled (S220). When receiving the 0K signal (S258), the control circuit 228b on the controller 204 side ends the initial setting on the controller 204 side, and becomes a state in which the screw tightening operation can be performed (S260). On the other hand, when the NG signal is received (S258), the memory 132 is accessed again to read the setting data again (S254). In the electric screwdriver 200, as in the electric screwdriver 100 according to embodiment 1, by monitoring whether or not the electric motor 212 is rotated at the time of activation of the control circuits 228a and 228b, the memories 232a and 232b are not accessed when the electric motor 212 is activated by the counter electromotive force. This can prevent the data such as the setting data in the memories 232a and 232b from being destroyed when the control circuits 228a and 228b stop accessing the memories 232a and 232b.
In the present embodiment, the control circuits 228a and 228b and the memories 232a and 232b are disposed in the electric screwdriver body 202 and the controller 204 in a distributed manner, but the role may be appropriately modified. The control circuits 228a and 228b and the memories 232a and 232b may be collectively disposed in one of the electric screwdriver main body 202 and the controller 204.
The embodiments of the present invention have been described above, but the present invention is not limited to these embodiments. For example, although the present invention has been described with reference to an electric screwdriver in the above embodiment, other types of electric tools that use an electric motor as a drive source, such as a torque wrench and a grinder, may be used. In addition, the access to the memory is permitted after the time when the rotation of the electric motor is stopped becomes equal to or longer than a predetermined reference time, but the reference time may be changed arbitrarily. In addition, for example, in the case where the rotation detection means capable of reliably detecting the stop of the rotation of the electric motor is used, the reference time may be eliminated, and the access to the memory may be permitted immediately after the rotation of the electric motor is determined to be stopped. As the information storage means for storing the setting data, other means such as a hard disk drive, a writable recording medium such as a CD or a DVD, and a detachable USB memory can be used in addition to the built-in semiconductor memory described above.
Description of the symbols
100. Electric screwdriver (electric tool)
110. Tool casing
112. Electric motor
114. Head holder
116. Screwdriver head
118. Display unit
120. Input button
122. Input interface
123. External power supply
124. Power line
126. Motor driving circuit
128. Control circuit
130. Hall sensor
132. Memory (information storage unit)
134. Wiring
136. Resistance element
200. Electric screw driver
202. Electric screwdriver body
204. Controller
206. Communication cable
210. Tool casing
212. Electric motor
222. Input interface
223. External power supply
224. Power line
226. Motor drive circuit
228a control circuit
228b control circuit
230. Hall sensor
232a memory
232b memory
238a communication unit
238b communication section.
Claims (8)
1. A control circuit for an electric power tool, the electric power tool comprising: an electric motor, a rotation detecting means for detecting the rotation of the electric motor and transmitting a rotation detection signal, and an information storing means for storing setting data relating to the control of the electric motor,
when a voltage is applied to the control circuit and the control circuit is activated, the presence or absence of rotation of the electric motor is determined based on the rotation detection signal, and the information storage unit is not accessed when it is determined that the electric motor is rotating.
2. The control circuit of claim 1,
is set to permit access to the information storage unit when it is determined that the time during which the rotation of the electric motor is stopped is equal to or longer than a given reference time.
3. The control circuit of claim 2,
when the stop time is equal to or longer than the reference time, the control device accesses the information storage means to read the setting data, and sets the control condition of the electric power tool based on the read setting data.
4. The control circuit of claim 2,
if access to the information storage unit is once permitted, the state in which access to the information storage unit is permitted regardless of the rotation of the electric motor is maintained thereafter.
5. The control circuit of claim 1,
the information storage means is a memory that can be read and written.
6. An electric power tool, wherein,
the disclosed device is provided with:
an electric motor;
a rotation detection unit that detects rotation of the electric motor and transmits a rotation detection signal;
an information storage unit that stores setting data related to control of the electric motor; and
the control circuit of any one of claims 1 to 4.
7. A control method for an electric power tool, the electric power tool including: an electric motor, a rotation detecting means for detecting rotation of the electric motor and transmitting a rotation detection signal, an information storing means for storing setting data relating to control of the electric motor, and a control circuit,
the control method comprises the following steps:
detecting rotation of the electric motor by the rotation detecting unit when the control circuit is activated by applying a voltage to the control circuit; and
it is set not to access the information storage unit when it is determined that the electric motor is rotated in the step of detecting the rotation of the electric motor.
8. The control method according to claim 7,
comprises the following steps:
timing a time during which rotation of the electric motor is stopped;
when the time of the stop becomes equal to or longer than a predetermined reference time, accessing the information storage unit to read the setting data;
setting the control condition of the electric tool according to the read setting data; and
after the setting step, the access to the information storage unit is permitted regardless of whether the electric motor is rotating.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-241726 | 2017-12-18 | ||
| JP2017241726 | 2017-12-18 | ||
| PCT/JP2018/043745 WO2019124007A1 (en) | 2017-12-18 | 2018-11-28 | Power tool, and control circuit and control method for power tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111491763A CN111491763A (en) | 2020-08-04 |
| CN111491763B true CN111491763B (en) | 2023-04-07 |
Family
ID=66994670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880081595.4A Active CN111491763B (en) | 2017-12-18 | 2018-11-28 | Electric tool, control circuit of electric tool and control method |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6853368B2 (en) |
| CN (1) | CN111491763B (en) |
| TW (1) | TWI690396B (en) |
| WO (1) | WO2019124007A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2024008647A (en) * | 2022-07-08 | 2024-01-19 | パナソニックホールディングス株式会社 | Electric tool |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006052825A2 (en) * | 2004-11-04 | 2006-05-18 | Milwaukee Electric Tool Corporation | Power tools, battery chargers and batteries |
| JP2008092622A (en) * | 2006-09-29 | 2008-04-17 | Seiko Epson Corp | Motor controller, original reading device, and motor control method |
| JP4720765B2 (en) * | 2007-03-02 | 2011-07-13 | パナソニック電工株式会社 | Electric tool control system |
| JP2009142110A (en) * | 2007-12-07 | 2009-06-25 | Sony Corp | Motor apparatus |
| JP2009220214A (en) * | 2008-03-17 | 2009-10-01 | Hitachi Koki Co Ltd | Power tool |
| TW201201967A (en) * | 2010-07-14 | 2012-01-16 | China Pneumatic Corp | Torque control apparatus of dynamic locking tool and its control procedure |
| JP5395773B2 (en) * | 2010-09-27 | 2014-01-22 | パナソニック株式会社 | Rechargeable power tool |
| TWM458284U (en) * | 2012-11-19 | 2013-08-01 | Kilews Ind Co Ltd | Power-driven screwdriver capable of detecting locking of screws |
| JP2015221494A (en) * | 2015-09-08 | 2015-12-10 | 日東工器株式会社 | Screw member tightening tool and count device |
| JP2017169336A (en) * | 2016-03-15 | 2017-09-21 | オムロン株式会社 | Motor controller |
| WO2017163304A1 (en) * | 2016-03-22 | 2017-09-28 | 三菱電機株式会社 | Electric motor, air conditioner, control apparatus, and method for manufacturing electric motor |
| WO2017170648A1 (en) * | 2016-03-29 | 2017-10-05 | 日東工器株式会社 | Control circuit for electric tool having setting data transmission function, electric tool, control device, and electric tool system |
| JP6902334B2 (en) * | 2016-06-08 | 2021-07-14 | 京セラインダストリアルツールズ株式会社 | Electric tool |
-
2018
- 2018-11-28 CN CN201880081595.4A patent/CN111491763B/en active Active
- 2018-11-28 JP JP2019536996A patent/JP6853368B2/en active Active
- 2018-11-28 WO PCT/JP2018/043745 patent/WO2019124007A1/en active Application Filing
- 2018-12-04 TW TW107143354A patent/TWI690396B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2019124007A1 (en) | 2019-12-19 |
| TW201934278A (en) | 2019-09-01 |
| JP6853368B2 (en) | 2021-03-31 |
| CN111491763A (en) | 2020-08-04 |
| TWI690396B (en) | 2020-04-11 |
| WO2019124007A1 (en) | 2019-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5395773B2 (en) | Rechargeable power tool | |
| US4907183A (en) | Battery powered computer system wherein a power supply is selectively shut off when a low battery power is detected | |
| KR102082166B1 (en) | System and method for serial communication by an electronic circuit | |
| US20120268995A1 (en) | Non-volatile semiconductor memory device and electronic apparatus | |
| JP2008533954A (en) | Method for improving reliability in DC brushless motor and cooling fan by microcontroller | |
| JP2002216417A (en) | Method and device for operating disk at low temperature | |
| JP2008041242A (en) | Spindle motor startup method and disk drive | |
| JP2003305668A (en) | Driving control means for electrical apparatus, hand- held machining tool, and driving method for electrical apparatus | |
| JP4634316B2 (en) | Storage device storage device | |
| CN111491763B (en) | Electric tool, control circuit of electric tool and control method | |
| KR100640664B1 (en) | Method for controlling the motor rotation of a disk drive and apparatus thereof | |
| JP2014165969A (en) | Motor discrimination apparatus | |
| JP2013172614A (en) | Rotation control device and method and disk drive device using the same | |
| JP4706626B2 (en) | Electronic control unit | |
| JP2008154425A (en) | Motor type discrimination method, motor controller, and its manufacturing method | |
| KR102470840B1 (en) | Semiconductor device and semiconductor system | |
| KR20200073417A (en) | Smart car system | |
| CN111157890A (en) | DC brushless motor capable of automatically recording abnormal operation and method thereof | |
| TWI782219B (en) | Fan control system | |
| JP6985065B2 (en) | Motor drive device and rotation detection method for motor drive device | |
| KR100699868B1 (en) | Apparatus and Method for controlling the drive in a hard disk drive | |
| JP2021173736A (en) | Hall element sensor and adjustment method therefor | |
| KR100240110B1 (en) | Operating method and apparatus for floppy disk driver | |
| CN117945099A (en) | Method and device for controlling device access line state, computer device and storage medium | |
| JP2592513Y2 (en) | HDD power supply circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |