CN217087804U - Electric tool speed regulation module - Google Patents
Electric tool speed regulation module Download PDFInfo
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- CN217087804U CN217087804U CN202220924880.1U CN202220924880U CN217087804U CN 217087804 U CN217087804 U CN 217087804U CN 202220924880 U CN202220924880 U CN 202220924880U CN 217087804 U CN217087804 U CN 217087804U
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Abstract
The utility model provides a pair of electric tool speed governing module, include: the electric tool comprises a controller, a speed regulating circuit, a gear setting circuit and a driving circuit, wherein one end of the speed regulating circuit is connected with a speed regulating switch arranged on the electric tool, and the other end of the speed regulating circuit is connected with a rotating speed receiving end of the controller; one end of the gear setting circuit is connected with a gear adjusting knob arranged on the electric tool, and the other end of the gear setting circuit is connected with a gear receiving end of the controller; one end of the driving circuit is connected with the driving output end of the controller, and the other end of the driving circuit is connected with a motor control loop of the electric tool. The gear setting circuit and the speed regulating circuit are arranged at the same time, the speed regulating gear of the motor is set by the gear setting circuit, and the motor is regulated to continuously change from the lowest rotating speed to the highest rotating speed set by the current gear by the speed regulating circuit. Through the matching adjustment of the gear setting circuit and the speed regulating circuit, the motor reaches an ideal rotating speed state.
Description
Technical Field
The utility model relates to an electric tool technical field, concretely relates to electric tool speed governing module.
Background
The electric tool is widely applied to various industries, most electric tools have a speed regulation function in order to meet the requirements of users, the users can automatically control the rotating speed of the electric tool according to application occasions or self habits, generally transmit a speed regulation signal to the controller through the speed regulation switch, and the controller outputs a preset duty ratio signal to the switch circuit according to the control signal so as to control the rotating speed of the motor. However, the existing electric tool has a simple speed regulation function and cannot meet the speed regulation requirement of a user with higher requirement.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the simple defect of electric tool speed governing function among the prior art to a electric tool speed governing module is provided.
In order to achieve the above purpose, the utility model provides a following technical scheme:
an embodiment of the utility model provides an electric tool speed governing module, include: the speed regulation device comprises a controller, a speed regulation circuit, a gear setting circuit and a driving circuit, wherein one end of the speed regulation circuit is connected with a speed regulation switch arranged on the electric tool, and the other end of the speed regulation circuit is connected with a rotating speed receiving end of the controller; one end of the gear setting circuit is connected with a gear adjusting knob arranged on the electric tool, and the other end of the gear setting circuit is connected with a gear receiving end of the controller; one end of the driving circuit is connected with the driving output end of the controller, the other end of the driving circuit is connected with a motor control loop of the electric tool, and the controller is used for receiving a rotating speed set value sent by the speed regulating switch and a gear set value sent by the gear adjusting knob and driving the motor to operate according to the rotating speed set value and the gear set value.
Optionally, the range setting circuit comprises: the shift setting potentiometer comprises a shift setting potentiometer, a first capacitor and a first resistor, wherein a first end of the shift setting potentiometer is connected with a power supply, a second end of the shift setting potentiometer is grounded, and a sliding end of the shift setting potentiometer is respectively connected with one end of the first capacitor and one end of the first resistor; the other end of the first resistor is connected with a gear receiving end of the controller, and the other end of the first capacitor is grounded.
Optionally, the speed regulation circuit includes: the intelligent control circuit comprises a speed regulation potentiometer, a second capacitor and a second resistor, wherein a first end of the speed regulation potentiometer is connected with a power supply through a terminal strip, a sliding end of the speed regulation potentiometer is respectively connected with one end of the second capacitor and one end of the second resistor through the terminal strip, and a second end of the speed regulation potentiometer is grounded through the terminal strip; the other end of the second resistor is connected with a rotating speed receiving end of the controller, and the other end of the second capacitor is grounded.
Optionally, the motor control circuit of the power tool comprises: the speed control device comprises a speed control switch, a motor and an electronic switch, wherein one end of the speed control switch is connected with an L-phase line of an alternating current power supply, the other end of the speed control switch is sequentially connected with the motor and the electronic switch, and the electronic switch is also connected with an N-phase line of the alternating current power supply and is grounded.
Optionally, the driving circuit comprises: the controller comprises a first triode, a third resistor, a fourth resistor, a second triode, a fifth resistor, a sixth resistor, a third capacitor, a fourth capacitor, a first diode and a second diode, wherein an emitting electrode of the first triode is connected with a driving output end of the controller, a base electrode of the first triode is grounded through the third resistor, and a collector electrode of the first triode is respectively connected with a base electrode of the second triode and one end of the fifth resistor through the fourth resistor; a collector of the second triode is connected with the electronic switch through the sixth resistor, and an emitter of the second triode is respectively connected with the other end of the fifth resistor, one end of the third capacitor, one end of the fourth capacitor, an anode of the first diode and an anode of the second diode; the other end of the third capacitor is connected with the other end of the fourth capacitor and the cathode of the first diode respectively and then is grounded, and the cathode of the second diode is connected with a power supply.
Optionally, the electric tool speed regulation module further comprises: and one end of the speed feedback circuit induces the electromagnetic field of the motor through the induction coil, and the other end of the speed feedback circuit is connected with the speed feedback end of the controller.
Optionally, the electric tool speed regulation module further comprises: and one end of the overcurrent detection circuit is connected into the motor control loop of the electric tool, and the other end of the overcurrent detection circuit is connected with the overcurrent detection end of the controller.
Optionally, the electric tool speed regulation module further comprises: and one end of the synchronous signal circuit is connected with an L-phase line of an alternating current power supply, and the other end of the synchronous signal circuit is connected with a synchronous signal end of the controller.
Optionally, the electric tool speed regulation module further comprises: and one end of the restart protection circuit is connected to the motor control loop of the electric tool, and the other end of the restart protection circuit is connected with the restart protection end of the controller.
The utility model discloses technical scheme has following advantage:
the embodiment of the utility model provides a pair of electric tool speed governing module, include: the electric tool comprises a controller, a speed regulating circuit, a gear setting circuit and a driving circuit, wherein one end of the speed regulating circuit is connected with a speed regulating switch arranged on the electric tool, and the other end of the speed regulating circuit is connected with a rotating speed receiving end of the controller; one end of the gear setting circuit is connected with a gear adjusting knob arranged on the electric tool, and the other end of the gear setting circuit is connected with a gear receiving end of the controller; one end of the driving circuit is connected with the driving output end of the controller, and the other end of the driving circuit is connected with a motor control loop of the electric tool. The gear setting circuit and the speed regulating circuit are arranged at the same time, the speed regulating gear of the motor is set by the gear setting circuit, and the motor is regulated to continuously change from the lowest rotating speed to the highest rotating speed set by the current gear by the speed regulating circuit. Through the matching adjustment of the gear setting circuit and the speed regulating circuit, the motor can reach an ideal rotating speed state, and the requirement of a user is met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic block diagram of a specific example of a speed regulating module of an electric tool according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of the gear setting circuit in the embodiment of the present invention;
FIG. 3 is a schematic diagram of the single chip microcomputer in the embodiment of the present invention;
fig. 4 is a circuit diagram of a specific example of a speed regulating module of an electric tool according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of speed feedback according to an embodiment of the present invention;
fig. 6 is a power supply circuit diagram in an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
An embodiment of the utility model provides an electric tool speed governing module, as shown in fig. 1, include: the electric tool comprises a controller 1, a speed regulating circuit 2, a gear setting circuit 3 and a driving circuit 4, wherein one end of the speed regulating circuit 2 is connected with a speed regulating switch arranged on the electric tool, and the other end of the speed regulating circuit 2 is connected with a rotating speed receiving end of the controller 1; one end of the gear setting circuit 3 is connected with a gear adjusting knob arranged on the electric tool, and the other end of the gear setting circuit 3 is connected with a gear receiving end of the controller 1; one end of the driving circuit 4 is connected with the driving output end of the controller 1, the other end of the driving circuit 4 is connected with a motor control loop of the electric tool, and the controller 1 is used for receiving a rotating speed set value sent by the speed regulating switch and a gear set value sent by the gear adjusting knob and driving the motor to operate according to the rotating speed set value and the gear set value.
In one embodiment, the speed regulating switch and the gear adjusting knob are both installed outside the casing of the electric tool. An operator adjusts the resistance value of the gear setting potentiometer in the gear setting circuit 3 by rotating the gear adjusting knob, and sets the speed regulating gear of the motor. The operator adjusts the resistance of the speed regulation potentiometer in the speed regulation circuit 2 by pressing the button of the speed regulation switch, and sets the rotating speed of the motor. The adjustable motor of the speed-regulating potentiometer continuously changes from the lowest rotating speed to the highest rotating speed set by the current gear.
Further, the speed regulating circuit 2 sends a set value of the rotational speed to the controller 1, and the gear setting circuit 3 sends a set value of the gear to the controller 1. After reading the set value of the rotating speed and the set value of the gear position, the controller 1 calculates a comprehensive speed setting signal of the motor according to a pre-fired program, and sends the comprehensive speed setting signal to a motor control loop through the drive circuit 4, so that the motor is controlled to operate near a given rotating speed. In the embodiment of the present invention, the controller 1 is a single chip microcomputer.
The embodiment of the utility model provides a pair of electric tool speed governing module, include: the electric tool comprises a controller, a speed regulating circuit, a gear setting circuit and a driving circuit, wherein one end of the speed regulating circuit is connected with a speed regulating switch arranged on the electric tool, and the other end of the speed regulating circuit is connected with a rotating speed receiving end of the controller; one end of the gear setting circuit is connected with a gear adjusting knob arranged on the electric tool, and the other end of the gear setting circuit is connected with a gear receiving end of the controller; one end of the driving circuit is connected with the driving output end of the controller, and the other end of the driving circuit is connected with a motor control loop of the electric tool. The gear setting circuit and the speed regulating circuit are arranged at the same time, the speed regulating gear of the motor is set by the gear setting circuit, and the motor is regulated to continuously change from the lowest rotating speed to the highest rotating speed set by the current gear by the speed regulating circuit. Through the matching adjustment of the gear setting circuit and the speed regulating circuit, the motor can reach an ideal rotating speed state, and the requirement of a user is met.
In one embodiment, as shown in fig. 2, the shift position setting circuit 3 includes: the gear setting potentiometer RV1, a first capacitor C5 and a first resistor R6, wherein a first end of the gear setting potentiometer RV1 is connected with a power supply, a second end of the gear setting potentiometer RV1 is grounded, and a sliding end of the gear setting potentiometer RV1 is connected with one end of the first capacitor C5 and one end of the first resistor R6 respectively; the other end of the first resistor R6 is connected with the gear receiving end of the controller 1, and the other end of the first capacitor C5 is grounded.
In one embodiment, during the operation of the motor, the operator adjusts the adjustment range setting potentiometer RV1 by rotating the range adjustment knob to change the current set speed range, which changes the current maximum rotation speed VGmax of the motor. The lowest rotational speed of each gear is the same and is denoted as Vmin. Further, the shift setting circuit 3 sends the shift setting value to the GEAR-SET port of the one-chip microcomputer U1 shown in fig. 3.
In one embodiment, as shown in fig. 4, the speed regulation circuit 2 includes: the variable-speed potentiometer RV2, the second capacitor C8 and the second resistor R4, wherein the first end of the variable-speed potentiometer RV2 is connected with a power supply through a terminal row, the sliding end of the variable-speed potentiometer RV2 is respectively connected with one end of the second capacitor C8 and one end of the second resistor R4 through the terminal row, and the second end of the variable-speed potentiometer RV2 is grounded through the terminal row; the other end of the second resistor R4 is connected with the rotating speed receiving end of the controller 1, and the other end of the second capacitor C8 is grounded.
In one embodiment, when the operator presses the button of the speed control switch SW1, the resistance of the speed control potentiometer RV2 changes according to the change of the pressed stroke, and the rotation speed set value changes linearly between Vmin and VGmax. And by changing the value of the gear setting potentiometer RV1, VGmax will change, causing the speed control range to change. The gear setting potentiometer RV1 and the speed regulation potentiometer RV2 can be arranged at the required positions, and the set speed of the motor can be changed no matter the RV1 or the RV2 is regulated.
In one embodiment, as shown in fig. 4, a motor control circuit of a power tool includes: speed regulation switch SW1, motor M and electronic switch T1, wherein, speed regulation switch SW 1's one end is connected with alternating current power supply's L looks line, and speed regulation switch SW 1's the other end is connected with motor M and electronic switch T1 in proper order, and electronic switch T1 still is connected and ground connection with alternating current power supply's N looks line.
In a specific embodiment, the single chip microcomputer U1 monitors the on-off state of the switch SW1 through a restart protection circuit, and when the single chip microcomputer U1 detects a signal that the speed regulation switch SW1 is switched from off to on, the single chip microcomputer U1 drives the T1 to output voltage to the motor to work according to the motor comprehensive speed setting signal. Further, the single chip microcomputer U1 adjusts the rotating speed of the motor by controlling the conduction time of the T1. In the embodiment of the present invention, the electronic switch T1 is a thyristor.
In one embodiment, as shown in fig. 4, the driving circuit 4 includes: the controller comprises a first triode Q4, a third resistor R13, a fourth resistor R12, a second triode Q3, a fifth resistor R11, a sixth resistor R10, a third capacitor C10, a fourth capacitor C11, a first diode ZD3 and a second diode D2, wherein an emitter of the first triode Q4 is connected with a driving output end of the controller 1, a base of the first triode Q4 is grounded through the third resistor R13, and a collector of the first triode Q4 is respectively connected with a base of the second triode Q3 and one end of the fifth resistor R11 through the fourth resistor R12; a collector of the second triode Q3 is connected with the electronic switch T1 through a sixth resistor R10, and an emitter of the second triode Q3 is connected with the other end of the fifth resistor R11, one end of a third capacitor C10, one end of a fourth capacitor C11, an anode of the first diode ZD3 and an anode of the second diode D2 respectively; the other end of the third capacitor C10 is connected to the other end of the fourth capacitor C11 and the cathode of the first diode ZD3, and then grounded, and the cathode of the second diode D2 is connected to the power supply.
In a specific embodiment, after the single chip microcomputer U1 detects a signal that the speed regulation switch SW1 is switched from off to on, the single chip microcomputer U1 sends a switching-on signal to drive the first triode Q4 to be switched on, and further the second triode Q3 is switched on, so that the electronic switch T1, the sixth resistor R10, the second triode Q3, the fourth resistor R12, the first triode Q4, and the third resistor R13 are switched on, and the electronic switch T1 is driven to be switched on. When T1 is conducted, a motor control loop of the electric tool is conducted, and the motor is electrified to start running. Further, the third capacitor C10, the fourth capacitor C11, the first diode ZD3 and the second diode D2 form a power supply loop.
Further, when the singlechip U1 detects that the speed regulation switch SW1 is disconnected, the T1 is stopped to be triggered, the output is closed, and the motor is stopped.
In one embodiment, as shown in fig. 5, the speed regulating module of the electric tool further includes: and one end of the speed feedback circuit 5 induces the electromagnetic field of the motor M through the induction coil, and the other end of the speed feedback circuit 5 is connected with the speed feedback end of the controller 1.
In a specific embodiment, the speed feedback circuit induces the electromagnetic field of the motor M through the induction coil L2 to generate induced electromotive force, and then the induced electromotive force is amplified and shaped into square wave pulses to be sent to the single chip microcomputer U1. The singlechip U1 realizes speed closed-loop control according to the fed-back real-time rotating speed of the motor, so that the speed is more stable. By adopting speed feedback, the constant-speed and constant-torque operation control of the motor is realized, and the stable operation is ensured.
Specifically, after the single chip microcomputer U1 is powered on, the U1 resets and starts to work, when a signal that the speed regulation switch SW1 is switched from off to on is detected, the U1 starts to drive the electronic switch T1 to output voltage to the motor to work, the U1 reads a comprehensive speed setting signal Vset given by the gear setting potentiometer RV1 and the speed regulation potentiometer RV2, meanwhile, the current actual rotating speed of the motor is calculated according to a speed feedback signal, the deviation e between the given rotating speed and the actual rotating speed of the motor is calculated, the deviation e is used for obtaining a phase angle triggering the T1 through PI operation, the conducting time of the T1 is controlled, and therefore the motor is controlled to run at a stable speed.
In one embodiment, as shown in fig. 4, the speed regulating module of the electric tool further includes: and one end of the overcurrent detection circuit 6 is connected into a motor control loop of the electric tool, and the other end of the overcurrent detection circuit 6 is connected with the overcurrent detection end of the controller 1.
In one embodiment, the over-current detection circuit 6 monitors the motor operating current and sends the detected current to the single-chip microcomputer U1. Under the condition of overcurrent, the single chip microcomputer U1 sends a turn-off signal to the drive circuit 4, so that the output of the thyristor T1 is turned off.
In one embodiment, as shown in fig. 4, the speed regulating module of the electric tool further includes: and one end of the synchronous signal circuit 7 is connected with an L-phase line of the alternating-current power supply, and the other end of the synchronous signal circuit 7 is connected with a synchronous signal end of the controller 1.
In a specific embodiment, the synchronization signal circuit 7 provides an alternating current power supply zero-crossing signal to realize the synchronous triggering of the thyristor T1 by the singlechip U1.
In one embodiment, as shown in fig. 4, the speed regulating module of the electric tool further includes: and a restart protection circuit 8, wherein one end of the restart protection circuit 8 is connected to a motor control loop of the electric tool, and the other end of the restart protection circuit 8 is connected with a restart protection end of the controller 1.
In a specific embodiment, the restart protection circuit 8 is configured to monitor an on-off state of the switch SW1, and send the on-off state of the switch SW1 to the single chip microcomputer U1, and the single chip microcomputer U1 controls the T1 to be turned on or off according to the state.
In one embodiment, the power supply circuit is as shown in fig. 6, and the ac power supply provides an input power supply for the power loop of the driving circuit 4 after a resistance drop. Furthermore, the voltage-dropped alternating current power supply provides 5V working voltage for a plurality of circuits after voltage stabilization and transformation.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.
Claims (9)
1. An electric tool speed regulation module, comprising: a controller, a speed regulating circuit, a gear setting circuit and a driving circuit, wherein,
one end of the speed regulating circuit is connected with a speed regulating switch arranged on the electric tool, and the other end of the speed regulating circuit is connected with a rotating speed receiving end of the controller;
one end of the gear setting circuit is connected with a gear adjusting knob arranged on the electric tool, and the other end of the gear setting circuit is connected with a gear receiving end of the controller;
one end of the driving circuit is connected with the driving output end of the controller, the other end of the driving circuit is connected with a motor control loop of the electric tool, and the controller is used for receiving a rotating speed set value sent by the speed regulating switch and a gear set value sent by the gear adjusting knob and driving the motor to operate according to the rotating speed set value and the gear set value.
2. The power tool speed regulation module of claim 1, wherein the gear setting circuit comprises: a shift setting potentiometer, a first capacitor and a first resistor, wherein,
the first end of the gear setting potentiometer is connected with a power supply, the second end of the gear setting potentiometer is grounded, and the sliding end of the gear setting potentiometer is connected with one end of the first capacitor and one end of the first resistor respectively;
the other end of the first resistor is connected with a gear receiving end of the controller, and the other end of the first capacitor is grounded.
3. The power tool speed regulation module of claim 1, wherein the speed regulation circuit comprises: a speed-regulating potentiometer, a second capacitor and a second resistor, wherein,
the first end of the speed-regulating potentiometer is connected with a power supply through a terminal strip, the sliding end of the speed-regulating potentiometer is respectively connected with one end of the second capacitor and one end of the second resistor through the terminal strip, and the second end of the speed-regulating potentiometer is grounded through the terminal strip;
the other end of the second resistor is connected with a rotating speed receiving end of the controller, and the other end of the second capacitor is grounded.
4. The power tool speed regulation module of claim 1, wherein the motor control circuit of the power tool comprises: a speed regulating switch, a motor and an electronic switch, wherein,
one end of the speed regulating switch is connected with an L-phase line of the alternating current power supply, the other end of the speed regulating switch is sequentially connected with the motor and the electronic switch, and the electronic switch is also connected with an N-phase line of the alternating current power supply and is grounded.
5. The power tool speed regulation module of claim 4, wherein the drive circuit comprises: a first triode, a third resistor, a fourth resistor, a second triode, a fifth resistor, a sixth resistor, a third capacitor, a fourth capacitor, a first diode and a second diode,
an emitting electrode of the first triode is connected with a driving output end of the controller, a base electrode of the first triode is grounded through the third resistor, and a collector electrode of the first triode is respectively connected with a base electrode of the second triode and one end of the fifth resistor through the fourth resistor;
a collector of the second triode is connected with the electronic switch through the sixth resistor, and an emitter of the second triode is respectively connected with the other end of the fifth resistor, one end of the third capacitor, one end of the fourth capacitor, an anode of the first diode and an anode of the second diode;
the other end of the third capacitor is connected with the other end of the fourth capacitor and the cathode of the first diode respectively and then is grounded, and the cathode of the second diode is connected with a power supply.
6. The power tool speed regulation module of claim 1, further comprising: and one end of the speed feedback circuit induces the electromagnetic field of the motor through the induction coil, and the other end of the speed feedback circuit is connected with the speed feedback end of the controller.
7. The power tool speed regulation module of claim 4, further comprising: and one end of the overcurrent detection circuit is connected into the motor control loop of the electric tool, and the other end of the overcurrent detection circuit is connected with the overcurrent detection end of the controller.
8. The power tool speed regulation module of claim 1, further comprising: and one end of the synchronous signal circuit is connected with an L-phase line of an alternating current power supply, and the other end of the synchronous signal circuit is connected with a synchronous signal end of the controller.
9. The power tool speed regulation module of claim 4, further comprising: and one end of the restart protection circuit is connected to the motor control loop of the electric tool, and the other end of the restart protection circuit is connected with the restart protection end of the controller.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220924880.1U CN217087804U (en) | 2022-04-20 | 2022-04-20 | Electric tool speed regulation module |
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| CN202220924880.1U CN217087804U (en) | 2022-04-20 | 2022-04-20 | Electric tool speed regulation module |
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| CN217087804U true CN217087804U (en) | 2022-07-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116633212A (en) * | 2023-07-17 | 2023-08-22 | 珠海市科力通电器有限公司 | Electric grinder, speed regulating circuit of electric grinder and control method of speed regulating circuit |
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- 2022-04-20 CN CN202220924880.1U patent/CN217087804U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116633212A (en) * | 2023-07-17 | 2023-08-22 | 珠海市科力通电器有限公司 | Electric grinder, speed regulating circuit of electric grinder and control method of speed regulating circuit |
| CN116633212B (en) * | 2023-07-17 | 2024-03-01 | 珠海市科力通电器有限公司 | Electric grinder, speed regulating circuit of electric grinder and control method of speed regulating circuit |
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