WO2021081825A1

WO2021081825A1 - Alternating current electric tool

Info

Publication number: WO2021081825A1
Application number: PCT/CN2019/114438
Authority: WO
Inventors: 王槐树; 徐天啸; 杜琪
Original assignee: 南京德朔实业有限公司
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2021-05-06
Also published as: CN115004523A; DE212019000516U1

Abstract

An alternating current electric tool, comprising: a housing on which a handle portion for a user to hold is formed, an accommodating space being formed in the handle portion; an alternating current unit configured to access an alternating current so as to supply power to the alternating current electric tool; a motor; and a motor control unit configured to control the motor, wherein the motor control unit comprises: an electromagnetic circuit board electrically coupled to the alternating current unit and configured to inhibit electromagnetic interference; a power supply circuit board electrically coupled to the electromagnetic circuit board and configured to convert the alternating current into a direct current; and a control circuit board electrically coupled to the power supply circuit board. The electromagnetic circuit board, the power supply circuit board, and the control circuit board are located in the accommodating space formed by the handle portion, and are arranged parallel to each other.

Description

AC power tools

Technical field

This application relates to an electric tool, for example, to an AC electric tool.

Background technique

Electric tools are divided into DC electric tools and AC electric tools according to the different power sources used. DC power tools have the advantages of fast response and small size. However, DC power tools require battery packs to provide power. Because of the limitation of battery pack life, DC power tools have a short battery life and cannot work continuously for a long time.

AC power tools better overcome the problem of battery life. However, the alternating current voltage of the alternating current electric tool is relatively large, and more circuits are required to match the alternating current voltage. On the one hand, the increase of the circuit requires the AC power tool to provide a large enough internal space for the layout of the circuit board. On the other hand, if only considering the increase in the volume of the AC power tool to increase the internal space, it will cause inconvenience for the customer to hold, thereby reducing Improve customer comfort.

Summary of the invention

The present application provides an AC power tool that is compact in structure and convenient for users to hold.

An embodiment provides an AC power tool, including: a housing formed with a handle portion for a user to hold; an AC power unit configured to access AC power to supply power to the AC power tool; a motor; and a motor control unit, provided In order to control the motor; wherein, the motor control unit includes: an electromagnetic circuit board, which is electrically coupled to the alternating current unit and configured to suppress electromagnetic interference; and a power supply circuit board, which is electrically coupled to the electromagnetic circuit board and configured to transmit the alternating current Converted into direct current; a control circuit board electrically coupled to the power circuit board; the electromagnetic circuit board, the power circuit board, and the control circuit board are located in the containing space formed by the handle, and the electromagnetic The circuit board, the power supply circuit board and the control circuit board are arranged in parallel with each other.

An embodiment provides an AC power tool, comprising: a housing formed with a holding part for a user to hold, the holding part is formed with an accommodating space, and the holding part has an upper side and a lower side opposed to each other A motor, located in the housing, the motor including a motor shaft; an alternating current unit configured to access alternating current to supply power to the motor; and a plurality of circuit boards, at least partially located in the containing space formed by the holding portion and They are arranged in parallel in the vertical direction; wherein the ratio of the grip circumference of the grip portion to the maximum circumference of the motor along the radial direction of the motor shaft ranges from 1.04-1.27.

Description of the drawings

Figure 1 is a schematic diagram of the structure of an electric tool in an embodiment;

Fig. 2 is a schematic diagram of the internal structure of the electric tool shown in Fig. 1;

Fig. 3 is a schematic diagram of the structure of a motor control unit in an embodiment;

Figure 4 is an exploded view of the motor control unit shown in Figure 3;

Fig. 5 is an exploded view of the motor control unit shown in Fig. 3 from another angle;

Figure 6 is a bottom view of the motor control unit shown in Figure 3;

FIG. 7 is a schematic diagram of the projection of the power supply circuit board, the control circuit board and the electromagnetic circuit board shown in FIG. 3 in the vertical direction;

Fig. 8 is a schematic diagram of the structure of a motor control unit in an embodiment;

Fig. 9 is a cross-sectional view of the motor control unit shown in Fig. 6 along the line BB'.

Detailed ways

This embodiment provides an AC power tool. In one embodiment, an angle grinder is taken as an example. 1 and 2, the angle grinder 100 includes a shield 101, an output shaft 102, a motor 103, a transmission mechanism, a housing 105, a motor control unit 108, an alternating current unit 106 and an operation switch 107.

The shield 101 at least partially covers the sanding disc to achieve a protective function. The output shaft 102 is configured to install or fix a grinding disc. The motor 103 is configured to drive the output shaft 102 to rotate. The motor 103 includes a rotor, a stator, and a motor shaft. The output shaft 102 and the motor shaft are connected through a transmission mechanism to transmit the driving force of the motor shaft to the output shaft 102.

The AC power unit 106 is configured to be connected to AC power to supply power to the angle grinder 100. In one embodiment, the AC power unit 106 includes an AC power plug and a peripheral circuit electrically connected to the AC power plug. Among them, the AC power plug is inserted into the AC power socket to access AC mains power, thereby providing a source of electrical energy for the power tool. In other embodiments, the AC power unit 106 further includes other structural forms and peripheral circuits that can be connected to AC power, for example, the AC power plug is connected to a movable substation to connect to the AC power. In one embodiment, the AC power unit 106 only needs to be able to access AC power, and the specific structure and form are not limited here. Among them, the value range of the alternating current that the alternating current unit 106 can access is 110V-130V or 210V-230V.

The housing 105 is formed with a handle portion 1051 for the user to hold and a head shell portion 1052 located at the front end of the handle portion 1051. Among them, the front end refers to the left side in Figure 1.

The head housing portion 1052 is formed with a head housing space capable of accommodating the motor 103 and the transmission mechanism. The handle portion 1051 is formed with an accommodating space for accommodating at least the motor control unit 108. The handle portion 1051 has an upper side and a lower side which are disposed oppositely. As shown in FIG. 2, the front end of the handle portion 1051 is formed with a grip portion for the user to hold, wherein the grip portion extends in the front-rear direction and is generally tubular. A downwardly extending convex portion located between the grip portion and the AC power unit 106 is formed at the rear end of the handle portion 1051. In one embodiment, the outer surface of the holding portion and the outer surface of the convex portion are integrally formed. The value range of the ratio of the grip circumference L1 of the grip part to the maximum circumference L2 of the motor 103 along the radial direction of the motor shaft is 1.04-1.27; in one embodiment, the grip circumference L1 of the grip part is equal to The value range of the ratio of the maximum circumference L2 of the motor 103 along the radial direction of the motor shaft is 1.1-1.2. Among them, the front and back or the front end and the back end in turn correspond to the left and right directions in FIG. 2.

The operation switch 107 is set to turn the motor 103 on or off. The motor 103 is started when the operation switch 107 is triggered, and the motor 103 is turned off when the operation switch 107 is released. The operation switch 107 is provided on the head housing 1052.

Although the present embodiment relates to the angle grinder 100, it should be understood that the present application is not limited to the disclosed embodiment, but can be applied to other types of electric tools.

The motor control unit 108 is arranged in the accommodating space formed by the handle portion 1051, and the motor control unit 108 is arranged to control the motor 103. As shown in FIG. 3, the motor control unit 108 at least includes an electromagnetic circuit board 40, a power circuit board 20 and a control circuit board 30. Among them, the electromagnetic circuit board 40, the control circuit board 30, and the power circuit board 20 are arranged in parallel with each other from bottom to top in sequence.

The electromagnetic circuit board 40 is electrically coupled with the alternating current unit 106, and is configured to access the alternating current input by the alternating current unit 106 and output the alternating current against electromagnetic interference.

As shown in FIGS. 5 and 6, the electromagnetic circuit board 40 includes an electromagnetic positive input terminal 45, an electromagnetic negative input terminal 46, an electromagnetic positive output terminal 42 and an electromagnetic negative output terminal 43. Among them, the electromagnetic positive input terminal 45 is set to be connected to the positive electrode of the alternating current unit 106. The electromagnetic negative input terminal 46 is set to be connected to the negative electrode of the alternating current unit 106. In an embodiment, the AC power unit 106 is a plug and a cable that can be connected to AC power, and the positive wire of the cable is electrically connected to the electromagnetic positive input terminal 45 (for example, the electrical connection is established by electric welding or electric insertion), The negative connection of the cable is electrically connected to the electromagnetic negative input terminal 46 (for example, the electrical connection is established by electric welding or electric insertion). The electromagnetic positive output terminal 42 is electrically coupled to the electromagnetic positive input terminal 45 to output anti-electromagnetic interference alternating current; the electromagnetic negative output terminal 43 is electrically coupled to the electromagnetic negative input terminal 46 to output anti-electromagnetic interference alternating current.

The electromagnetic circuit board 40 also includes an electromagnetic element 47 and other electronic components that implement anti-electromagnetic interference functions. The electromagnetic element 47 and other electronic components that realize the anti-electromagnetic interference function are connected in series between the electromagnetic positive input terminal 45 and the electromagnetic positive output terminal 42 to perform anti-electromagnetic interference treatment on the alternating current. The electromagnetic element 47 is installed on the side of the electromagnetic circuit board 40 away from the control circuit board 30.

In one embodiment, the electromagnetic circuit board 40 is a PCB board, and the electromagnetic element 47 includes a large capacitor, an inductor, and an electrolytic capacitor. Among them, in the vertical direction, the capacitor and the inductor are installed on the lower side of the electromagnetic circuit board 40 away from the control circuit board 30. In the front-rear direction, the electrolytic capacitor is mounted on the back side of the electromagnetic circuit board 40. In this way, an electrolytic capacitor with a relatively large volume can be accommodated in the convex space formed by the convex portion, thereby reducing the size of the gripping portion.

5, the electromagnetic circuit board 40 further includes a first electromagnetic through hole 44 and a second electromagnetic through hole 41, the first electromagnetic through hole 44, the second electromagnetic through hole 41, the electromagnetic positive output terminal 42, and the electromagnetic negative output terminal 43 The electromagnetic circuit boards 40 are arranged side by side in the front-rear direction. The first electromagnetic through hole 44 and the second electromagnetic through hole 41 are respectively arranged to pass the rectified positive output terminal 213 and the rectified negative output terminal 214 on the power circuit board 20.

The power circuit board 20 is electrically coupled to the electromagnetic circuit board 40, and is configured to convert the anti-electromagnetic interference alternating current connected to the electromagnetic circuit board 40 into a direct current output.

As shown in FIG. 4, the power circuit board 20 includes a rectifier bridge 21 and a filter capacitor 26. The rectifier bridge 21 and the filter capacitor 26 are installed on the side of the power circuit board 20 away from the control circuit board 30. In one embodiment, the rectifier bridge 21 and the filter capacitor 26 are arranged in the convex space formed by the convex part and close to the outer surface of the convex part, so that the difference between the power supply circuit board 20 and the control circuit board 30 can be reduced in the vertical direction. On the one hand, the distance between the protrusions reduces the diameter of the circumference formed by the outer surface of the convex portion, and on the other hand, it also reduces the size of the gripping portion.

As shown in FIGS. 4 and 5, the rectifying bridge 21 includes a rectifying positive input terminal 211, a rectifying negative input terminal 212, a rectifying positive output terminal 213 and a rectifying negative output terminal 214. The rectifying positive input terminal 211 is electrically coupled to the electromagnetic positive output terminal 42 to connect to the positive electrode of the alternating current, and the rectifying negative input terminal 212 is electrically coupled to the electromagnetic negative output terminal 43 to connect to the negative electrode of the alternating current. The rectifier positive output terminal 213 is electrically coupled to the power supply positive input terminal 25 to output the positive electrode of the direct current rectified by the rectifier bridge 21 to the power supply circuit board 20, and the rectifier negative output terminal 214 is electrically coupled to the power supply negative input terminal 22 to output the output through the rectifier bridge 21. The negative pole of the rectified DC power goes to the power supply circuit board 20.

In one embodiment, the rectifier bridge 21 is a rectifier chip, and the rectifier positive input terminal 211, the rectifier negative input terminal 212, the rectifier positive output terminal 213, and the rectifier negative output terminal 214 are the pins of the rectifier bridge 21. In other embodiments, the rectified positive input terminal 211, the rectified negative input terminal 212, the rectified positive output terminal 213, and the rectified negative output terminal 214 are pins extending in one direction.

The power supply circuit board 20 further includes a first power supply through hole 23 and a second power supply through hole 24. The first power supply through hole 23 is arranged opposite to the rectifying positive input terminal 211 in the up and down direction so that the rectifying positive input terminal 211 passes through the first power supply through hole 23; the second power supply through hole 24 is opposite in the up and down direction The rectified negative input terminal 212 is arranged so that the rectified negative input terminal 212 passes through the second power supply through hole 24.

The power circuit board 20 also includes a power positive output terminal 27 and a power negative output terminal 28. The power supply positive output terminal 27 and the power supply positive input terminal 25 are electrically coupled to connect to the filtered direct current; the power negative output terminal 28 and the power negative input terminal 22 are electrically coupled to connect to the filtered direct current.

The control circuit board 30 is configured to realize the control function of the angle grinder 100. Referring to FIGS. 2 to 3, the control circuit board 30 is disposed in the containing space formed by the grip and the convex portion. The length of the control circuit board 30 is greater than the length of the electromagnetic circuit board 40, and the length of the control circuit board 30 is greater than the length of the power circuit board 20.

Referring to FIG. 7, the control circuit board 30 includes a first area 31 and a second area 32. Wherein, the projection of the first area 31 in the vertical direction coincides with the projection of the electromagnetic circuit board 40 and the power circuit board 20 in the vertical direction. The projection surface of the second region 32 in the vertical direction exceeds the projection surface of the electromagnetic circuit board 40 and the power supply circuit board 20 in the vertical direction. The heat sink can be arranged in the second area 32, further reducing the size of the grip.

As shown in FIG. 5, the control circuit board 30 includes a first control positive input terminal 34, a first control negative input terminal 35, a first control through hole 33 and a second control through hole 36. The first control positive input terminal 34, the first control negative input terminal 35, the first control through hole 33, and the second control through hole 36 are arranged side by side in the front and rear direction of the control circuit board 30 and are all arranged on the first control circuit board 30. Within an area 31. Wherein, the first control positive input terminal 34 is electrically coupled to the electromagnetic positive output terminal 42 to connect to the positive electrode of the alternating current, and the first control negative input terminal 35 is electrically coupled to the electromagnetic negative output terminal 43 to connect to the negative electrode of the alternating current. The first control through hole 33 is arranged in the up and down direction relative to the rectifying positive input terminal 211 so that the rectifying positive output terminal 211 passes through the first control through hole 33; the second control through hole 36 is arranged in the up and down direction relative to the rectifying negative output terminal 214 It is arranged so that the rectified negative output terminal 214 passes through the second control through hole 36.

The control circuit board 30 also includes a second control positive input terminal 37 and a second control negative input terminal 38. The second control positive input terminal 37 and the second control negative input terminal 38 are provided in the first area 31. Among them, the second control positive input terminal 37 is electrically coupled to the power supply positive output terminal 27 to connect the positive electrode of the direct current to the control circuit board 30, and the power negative output terminal 28 is electrically coupled to the second control negative input terminal 38 to connect to the direct current. The negative pole to the control circuit board 30. In an embodiment, the power positive output terminal 27 and the second control positive input terminal 37 are electrically connected through a connecting pin, and the power negative output terminal 28 and the second control negative input terminal 38 are electrically connected through a connecting pin. In other embodiments, the power supply positive output terminal 27 and the second control positive input terminal 37 are electrically connected by wires, and the power supply negative output terminal 28 and the second control negative input terminal 38 are electrically connected by wires.

The power circuit board 20 is electrically coupled to the electromagnetic circuit board 40 to connect to alternating current; the control circuit board 30 is electrically coupled to the power circuit board 20 to connect to direct current. The control circuit board 30 is also electrically coupled to the electromagnetic circuit board 40 for access to alternating current.

The electronic components of the power supply circuit board 20 and the electromagnetic circuit board 40 are mounted on the side away from the control circuit board 30, which can reduce the volume of the motor control unit 108 and further reduce the size of the handle portion 1051 accommodating the motor control unit 108. The structure of the tool is more compact.

In an embodiment, the rectifier bridge 21 is sequentially inserted into the power circuit board 20, the control circuit board 30, and the electromagnetic circuit board 40 along the up and down direction.

The positive pole of the alternating current unit 106 is connected to the electromagnetic positive input terminal 45, the negative pole of the alternating current unit 106 is connected to the electromagnetic negative input terminal 46, and the positive electrode of the anti-electromagnetic interference alternating current is output from the electromagnetic positive output terminal 42 to the rectifier positive input terminal 211, which is anti-electromagnetic interference The negative electrode of the alternating current is output from the electromagnetic negative output terminal 43 to the rectified negative input terminal 212. The alternating current is rectified into direct current through the rectifier bridge 21, and is transmitted to the power current board 20 through the rectified positive output terminal 213 and the rectified negative output terminal 214. The direct current is filtered by the filter capacitor 26, and then the positive and negative electrodes of the direct current are respectively transmitted to the control circuit board 30 through the power positive output terminal 27 and the power negative output terminal 28. In an embodiment, the positive pole of the direct current is transmitted to the second control positive input terminal 37, and the negative pole of the direct current is transmitted to the second negative control input terminal 38.

The positive electrode of the anti-electromagnetic interference alternating current is also output to the first control positive input terminal 34 on the control circuit board 30 through the rectifying positive input terminal 211; the electromagnetic negative output terminal 43 outputs the negative electrode of the anti-electromagnetic interference alternating current to the rectifying negative input terminal 212, The alternating current is output to the first control negative input terminal 35 on the control circuit board 30 through the rectified negative input terminal 212. In one embodiment, the control circuit board 30 is provided with a zero-crossing detection circuit and a controller. The zero-crossing detection circuit is configured to connect to AC power and output a zero-crossing signal to the controller when the AC voltage crosses the zero point. In order to receive the zero-crossing signal from the zero-crossing detection circuit and trigger the timing when the zero-crossing signal is used, a first control signal is output to the driving circuit within a preset time interval to power on the stator winding to start the motor 103. At this time, current flows through the stator windings, so that the stator windings generate a stator magnetic field, and the stator magnetic field interacts with the rotor to make the motor 103 start to rotate.

In the motor control unit 108, connecting pins can be used to realize electrical connections between multiple circuit boards, and the pins of electronic components can be used for electrical connections between different circuit boards. Therefore, it is not necessary to make additional connecting members between the circuit boards, so that the motor control unit 108 can be made more compact, and the size of the grip portion 1051 accommodating the motor control unit 108 can be reduced accordingly, which enhances the comfort of the user experience and also makes The connection of multiple circuit boards is more stable.

Referring to FIGS. 8 and 9, the motor control unit 108 further includes an insulating gasket 50 and a support 60. The insulating gasket 50 is arranged between the power supply circuit board 20 and the control circuit board 30 to prevent the short circuit between the power supply circuit board 20 and the control circuit board 30 from being too close. In an embodiment, the insulating gasket 50 further includes a recess, which can pass the rectified positive input terminal 211, the rectified negative input terminal 212, the rectified positive output terminal 213, and the rectified negative output terminal 214. In other embodiments, the insulating gasket 50 includes four through holes, and the four through holes are arranged opposite to the terminals of the rectifier bridge 21 in the up and down direction so that the rectification positive input terminal 211, the rectification negative input terminal 212, and the rectification positive output terminal 213 And the rectified negative output terminal 214 can pass through.

The support 60 includes a support plate 61, a first support portion 62 and a second support portion 63. The support plate 61 is arranged between the control circuit board 30 and the electromagnetic circuit board 40, which can prevent the control circuit board 30 and the electromagnetic circuit board 40 from being too close to generate a circuit. The first support portion 62 is provided on the upper side of the support plate 61 and is formed with a first accommodating space for accommodating the power supply circuit board 20 and the control circuit board 30, and the second support portion 63 is provided on the lower side of the support plate 61 and is formed with a accommodating electromagnetic circuit The second accommodating space of the board 40. The support 60 can also fix the motor control unit 108, so that the motor control unit 108 is more stably fixed to the handle 1051.

The assembly method of the motor control unit 108 is as follows: the rectifier bridge 21 is inserted into the power circuit board 20 in the up and down direction; the rectifier bridge 21 is inserted into the insulating gasket 50 in the up and down direction; the rectifier bridge 21 is inserted into the control circuit board 30 in the up and down direction; The support 60 is inserted in the up and down direction; the rectifier bridge 21 is inserted into the electromagnetic circuit board 40 in the up and down direction.

Claims

An AC power tool, including:

The housing is formed with a handle portion for the user to hold, and the handle portion is formed with an accommodating space;

The AC power unit is set to be connected to AC power to supply power to the AC power tool;

Motor; and

A motor control unit, configured to control the motor;

Wherein, the motor control unit includes:

An electromagnetic circuit board electrically coupled to the AC unit and configured to suppress electromagnetic interference;

A power circuit board electrically coupled to the electromagnetic circuit board and configured to convert the alternating current into direct current; and

The control circuit board is electrically coupled to the power supply circuit board;

Wherein, the electromagnetic circuit board, the power supply circuit board and the control circuit board are located in the containing space, and the electromagnetic circuit board, the power supply circuit board and the control circuit board are arranged in parallel with each other.
The AC power tool according to claim 1, wherein the handle portion has an upper side and a lower side which are arranged oppositely; and the control circuit board is formed with:

In the first area, the projection surfaces of the electromagnetic circuit board and the power supply circuit board in the up and down directions respectively coincide with the projection surfaces of the first area in the up and down directions; and

In the second area, the projection surface of the second area in the vertical direction exceeds the projection surface of the electromagnetic circuit board and the power circuit board in the vertical direction.
The AC power tool according to claim 1, wherein the electromagnetic circuit board includes an electromagnetic element; the length of the control circuit board is greater than the length of the electromagnetic circuit board so that the electromagnetic element is mounted on the electromagnetic circuit board The side away from the control circuit board.
The AC power tool according to claim 1, wherein the power circuit board includes a rectifier bridge and a filter capacitor; the length of the control circuit board is greater than the length of the power circuit board so that the rectifier bridge and the filter capacitor The capacitor is installed on the side of the power circuit board away from the control circuit board.
The AC power tool according to claim 2, wherein the electromagnetic circuit board includes an electromagnetic positive output terminal and an electromagnetic negative output terminal, and the control circuit board includes:

The first control positive input terminal is electrically connected to the electromagnetic positive output terminal to connect the positive electrode of the alternating current to the control circuit board; and

The first control negative input terminal is electrically connected to the electromagnetic negative output terminal to connect the negative electrode of the alternating current to the control circuit board;

Wherein, the first control positive input terminal and the first control negative input terminal are located in the first area.
The AC electric tool according to claim 5, wherein the power circuit board comprises a rectifier bridge, a power supply positive input terminal and a power supply negative input terminal, and the rectifier bridge is configured to convert the alternating current into a direct current output;

Wherein, the rectifier bridge includes:

A rectified positive input terminal electrically coupled to the electromagnetic positive output terminal to access the alternating current;

A rectified negative input terminal electrically coupled to the electromagnetic negative output terminal to access the alternating current;

The rectified positive output terminal is electrically connected to the positive input terminal of the power supply; and

The rectified negative output terminal is electrically connected to the negative input terminal of the power supply;

Wherein, the positive input terminal of the power supply is electrically connected with the positive output terminal of the rectifier to access the direct current rectified by the rectifier bridge, and the positive output terminal of the rectification passes through the positive input terminal of the power supply; the negative input of the power supply The terminal is electrically connected to the rectified negative output terminal to access the direct current rectified by the rectifier bridge, and the rectified negative output terminal passes through the negative input terminal of the power supply;

The power supply circuit board further includes:

The first power supply through hole is arranged in an up-down direction relative to the rectifying positive input terminal so that the rectifying positive input terminal passes through the first power supply through hole; and

The second power supply through hole is arranged relative to the rectifying negative input terminal in the up and down direction so that the rectifying negative input terminal passes through the second power supply through hole.
The AC power tool according to claim 6, wherein the electromagnetic circuit board further comprises an electromagnetic positive input terminal and an electromagnetic negative input terminal, the electromagnetic positive input terminal is set to be connected to the positive electrode of the alternating current; the electromagnetic negative The input terminal is set to connect to the negative electrode of the alternating current; the electromagnetic positive output terminal is electrically coupled to the electromagnetic positive input terminal to output anti-electromagnetic interference alternating current; the electromagnetic negative output terminal is electrically connected to the electromagnetic negative input terminal The rectified positive input terminal penetrates the electromagnetic positive output terminal; the rectified negative output terminal penetrates the electromagnetic negative output terminal.
The AC power tool according to claim 6, wherein the control circuit board further comprises:

A first control through hole, which is arranged relative to the rectifying positive output terminal in the up-down direction so that the rectifying positive output terminal passes through the first control through hole; and

The second control through hole is arranged relative to the rectifying negative output terminal in the up-down direction so that the rectifying negative output terminal passes through the second control through hole.
The AC power tool according to claim 6, wherein the electromagnetic circuit board further comprises:

The first electromagnetic through hole is arranged opposite to the rectifying positive output terminal in the up-down direction so that the rectifying positive output terminal passes through the first electromagnetic through hole; and

The second electromagnetic through hole is arranged opposite to the rectifying negative output terminal in the up-down direction so that the rectifying negative output terminal passes through the second electromagnetic through hole.
The AC power tool according to claim 6, wherein the motor control unit further comprises an insulating spacer, the insulating spacer being arranged between the power circuit board and the control circuit board; the insulating spacer It includes a recess through which the rectified positive input terminal, the rectified negative input terminal, the rectified positive output terminal and the rectified negative output terminal pass.
The AC power tool according to claim 1, wherein the motor control unit further comprises a support, and the support includes a support plate, a first support part and a second support part;

The supporting board is arranged between the electromagnetic circuit board and the control circuit board;

The first supporting portion is formed with a first accommodating space, and the first accommodating space is configured to accommodate the power circuit board and the control circuit board;

The second supporting portion is formed with a second accommodating space, and the second accommodating space is configured to accommodate the electromagnetic circuit board.
An AC power tool, including:

The housing is formed with a holding portion for the user to hold, the holding portion is formed with an accommodating space, and the holding portion has an upper side and a lower side that are arranged oppositely;

A motor located in the housing, and the motor includes a motor shaft;

AC power unit, set to be connected to AC power to supply power to the motor; and

A plurality of circuit boards, at least partially located in the containing space and arranged in parallel in the up and down direction;

Wherein, the value range of the ratio of the grip circumference of the grip portion to the maximum circumference of the motor along the radial direction of the motor shaft is 1.04-1.27.
The AC power tool according to claim 12, wherein the plurality of circuit boards comprise:

An electromagnetic circuit board electrically coupled to the AC unit and configured to suppress electromagnetic interference;

A power circuit board electrically coupled to the electromagnetic circuit board and configured to convert the alternating current into direct current; and

The control circuit board is electrically coupled to the power supply circuit board;

Wherein, the electromagnetic circuit board, the power supply circuit board and the control circuit board are located in the containing space, and the electromagnetic circuit board, the power supply circuit board and the control circuit board are arranged in parallel with each other.
The AC power tool according to claim 13, wherein the control circuit board is formed with:

In the first area, the projection surface of the electromagnetic circuit board and the power supply circuit board in the vertical direction coincides with the projection surface of the first area in the vertical direction; and

In the second area, the projection surface of the second area in the vertical direction exceeds the projection surface of the electromagnetic circuit board and the power circuit board in the vertical direction.
The AC power tool according to claim 13, wherein the electromagnetic circuit board includes an electromagnetic element; the length of the control circuit board is greater than the length of the electromagnetic circuit board so that the electromagnetic element is mounted on the electromagnetic circuit board The side away from the control circuit board.
The AC power tool according to claim 13, wherein the power circuit board includes a rectifier bridge and a filter capacitor; the length of the control circuit board is greater than the length of the power circuit board so that the rectifier bridge and the filter The capacitor is installed on the side of the power circuit board away from the control circuit board.
The AC power tool according to claim 14, wherein the electromagnetic circuit board includes an electromagnetic positive output terminal and an electromagnetic negative output terminal, and the control circuit board further includes:

The first control positive input terminal is electrically connected to the electromagnetic positive output terminal to connect the positive electrode of the alternating current to the control circuit board; and

The first control negative input terminal is electrically connected to the electromagnetic negative output terminal to connect the negative electrode of the alternating current to the control circuit board;

Wherein, the first control positive input terminal and the first control negative input terminal are located in the first area.
The AC electric tool according to claim 17, wherein the power circuit board comprises a rectifier bridge, a power supply positive input terminal and a power supply negative input terminal, and the rectifier bridge is configured to convert the AC power into a DC power output;

Wherein, the rectifier bridge includes:

A rectified positive input terminal electrically coupled to the electromagnetic positive output terminal to access the alternating current;

A rectified negative input terminal electrically coupled to the electromagnetic negative output terminal to access the alternating current;

The rectified positive output terminal is electrically connected to the positive input terminal of the power supply; and

The rectified negative output terminal is electrically connected to the negative input terminal of the power supply;

Wherein, the positive input terminal of the power supply is electrically connected with the positive output terminal of the rectifier to access the direct current rectified by the rectifier bridge, the positive output terminal of the rectification passes through the positive input terminal of the power supply; the negative input of the power supply The terminal is electrically connected to the rectified negative output terminal to access the direct current rectified by the rectifier bridge, and the rectified negative output terminal passes through the negative input terminal of the power supply;

The power supply circuit board further includes:

The first power supply through hole is arranged in the up-down direction relative to the rectification positive input terminal so that the rectification positive input terminal passes through the first power supply through hole; and

The second power supply through hole is arranged relative to the rectifying negative input terminal in the up and down direction so that the rectifying negative input terminal passes through the second power supply through hole.
The AC power tool according to claim 18, wherein the electromagnetic circuit board further comprises an electromagnetic positive input terminal and an electromagnetic negative input terminal, the electromagnetic positive input terminal is set to be connected to the positive electrode of the alternating current; the electromagnetic negative The input terminal is set to connect to the negative electrode of the alternating current; the electromagnetic positive output terminal is electrically coupled to the electromagnetic positive input terminal to output anti-electromagnetic interference alternating current; the electromagnetic negative output terminal is electrically connected to the electromagnetic negative input terminal The rectified positive input terminal penetrates the electromagnetic positive output terminal; the rectified negative output terminal penetrates the electromagnetic negative output terminal.
The AC power tool according to claim 18, wherein the control circuit board further comprises:

A first control through hole, which is arranged relative to the rectifying positive output terminal in the up-down direction so that the rectifying positive output terminal passes through the first control through hole; and

The second control through hole is arranged relative to the rectifying negative output terminal in the up-down direction so that the rectifying negative output terminal passes through the second control through hole.
The AC power tool according to claim 18, wherein the electromagnetic circuit board further comprises:

The first electromagnetic through hole is arranged opposite to the rectifying positive output terminal in the up and down direction so that the rectifying positive output terminal passes through the first electromagnetic through hole; and

The second electromagnetic through hole is arranged opposite to the rectifying negative output terminal in the up-down direction so that the rectifying negative output terminal passes through the second electromagnetic through hole.
The AC electric tool according to claim 18, further comprising a motor control unit, the motor control unit comprising an insulating spacer, the insulating spacer being arranged between the power circuit board and the control circuit board; the The insulating gasket includes a recess through which the rectification positive input terminal, the rectification negative input terminal, the rectification positive output terminal, and the rectification negative output terminal pass.
The AC power tool according to claim 22, wherein the motor control unit further comprises a support, and the support includes a support plate, a first support part and a second support part;

The supporting board is arranged between the electromagnetic circuit board and the control circuit board;

The first supporting portion is formed with a first accommodating space, and the first accommodating space is configured to accommodate the power circuit board and the control circuit board;

The second supporting portion is formed with a second accommodating space, and the second accommodating space is configured to accommodate the electromagnetic circuit board.