CN208961121U - Electric tool - Google Patents
Electric tool Download PDFInfo
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- CN208961121U CN208961121U CN201821320400.0U CN201821320400U CN208961121U CN 208961121 U CN208961121 U CN 208961121U CN 201821320400 U CN201821320400 U CN 201821320400U CN 208961121 U CN208961121 U CN 208961121U
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- motor
- circuit board
- electric tool
- shaft
- rotor
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- Brushless Motors (AREA)
Abstract
The utility model discloses a kind of electric tools, comprising: brushless motor, the motor include rotor and the stator at least three-phase windings, the rotor is mounted on motor shaft, wherein the motor has opposite front side and rear side, circuit board, including control chip；Motor-drive circuit, the motor-drive circuit installation is on circuit boards；The motor is only drawn and the joining several phase lines of at least three-phase windings of the stator, several phase lines of the motor are connected to circuit board, motor rotor position is obtained via terminal voltage signal in control chip acquisition several phase lines of motor of circuit board and/or current signal, such setting greatly reduces influence of the armature-reaction to motor performance.
Description
Technical field
The utility model relates to electric tool and its control methods, and in particular to the electric tool with brushless motor.
Background technique
Currently, high-voltage brushless motor in electric tool using more and more, machine system mainly includes motor, control
Device, position sensor, complete machine mechanical structure portion.Each electric tool producer is all in the product for gradually releasing high-voltage brushless.
But current high-voltage brushless product is based on position sensor and detects rotor-position, and is changed according to rotor-position signal generation
Phase signals are controlled.But position sensor will increase machine volume and cost, and operating temperature is restricted, installation positioning
Precision also can have large effect to the performance of complete machine.
B&D company US publication US2017/0110935 A1 discloses a kind of high-voltage brushless electric tool, with reference to figure
7, including electromagnetic induction element 84 and position sensing plate 116, the operating position of 84 induction electromotor rotor of electromagnetic induction element, and
The position signal that rotor is obtained by position sensing plate 116 is passed due to being typically provided with multiple positions on position sensing plate 116
Sensor, on the one hand will increase machine volume and cost, and the position sensor on another aspect position sensing plate is limited vulnerable to temperature etc.
System, influences motor position detection accuracy.
Electrician tool was following development trend without electromagnetic induction element sensing using brushless motor, early in 2014
Company does not use the scheme of electromagnetic induction element to study brushless motor, our company China publication CN105207549A
Disclose driving control system for electric machine and control circuit respectively with CN106411187A, be not directed in electric tool motor and
The installation of the devices such as circuit board, and installation site can have large effect to the performance of complete machine.
Summary of the invention
In order to solve the deficiencies in the prior art, the main purpose of the utility model is to provide a kind of compact-sized and simplify
The noninductive electric tool of high pressure.
For the above-mentioned main purpose of realization, the one kind of technical solution of the utility model provides a kind of electric tool, including
Shell has cavity, and the shell includes electric machine casing and non-electric machine casing；Motor shaft；Brushless motor is mounted on electric machine casing
Interior, the motor includes rotor and the stator at least three-phase windings, and the rotor is mounted on motor shaft；Circuit board, packet
Controller is included, the circuit board is mounted in non-motor casing body；Motor-drive circuit, including switching component, the motor drive
Dynamic circuit installation on circuit boards, is arranged to driving motor；AC AC power source plug, the plug receive 85V ~ 265V and hand over
Flow power input；AC/DC converting unit, is attached to the AC AC power source plug and output DC direct current supplies electricity to the motor and drives
Dynamic circuit；Wherein, the motor only draws several phase lines of connection corresponding at least three-phase windings of the stator, the electricity
Several phase lines of machine are connected to circuit board, via circuit board controller acquisition several phase lines of motor on terminal voltage signal and/
Or current signal obtains motor rotor position.
Further, the electric tool includes the output shaft that connection has saw blade, and the output shaft is driven by transmission device
Ground is connected on motor shaft, and is arranged in parallel with the motor shaft.
The utility model another technical solution provides a kind of electric tool, including shell has a cavity；Motor shaft；Nothing
Brush motor is mounted in shell, and the motor includes rotor and the stator at least three-phase windings, and the rotor is mounted on electricity
On arbor, wherein the motor have opposite front side and rear side, and with along the front end that motor axis direction extends, and before
Hold opposite rear end；Circuit board, including control chip；Motor-drive circuit, including switching component, the motor-drive circuit
Installation on circuit boards, is arranged to driving motor；AC AC power source plug, the plug receive at least 85V AC power source
Input；AC/DC converting unit, is attached to the AC AC power source plug and output DC direct current supplies electricity to the motor driven electricity
Road；Wherein, the front side of the brushless motor is arranged in the motor-drive circuit and circuit board；Wherein, the motor is only drawn
With the joining several phase lines of at least three-phase windings of the stator, several phase lines of the motor are connected to circuit board, warp
Rotor position is obtained by terminal voltage signal in control chip acquisition several phase lines of motor of circuit board and/or current signal
It sets；Wherein, the rear end of the motor cooperates detection-sensitive motor axis without magnetic induction part and position sensing plate or position sensor
Rotary motion.
Further, the electric tool includes an output shaft, and the output shaft is driveably connected to electricity by transmission device
On arbor, and it is arranged in parallel with the motor shaft.
The utility model another technical solution provides a kind of electric tool, including shell has a cavity；Motor shaft；Nothing
Brush motor is mounted in shell, and the motor includes rotor and the stator at least three-phase windings, and the rotor is mounted on electricity
On arbor；Circuit board, including control chip；Motor-drive circuit, including switching component, the motor-drive circuit are mounted on
On circuit board, it is arranged to drive brushless motor；Wherein, the motor is only drawn is connected at least three-phase windings of the stator
Several phase lines, several phase lines of the motor are connected to circuit board, several via the control chip acquisition motor of circuit board
Terminal voltage signal and/or current signal obtain motor rotor position in root phase line.
Further, the electric tool includes an output shaft, and the output shaft is driveably connected to electricity by transmission device
On arbor, and it is arranged in parallel with the motor shaft.
High-voltage brushless electric tool using the above scheme, it is no longer necessary to which magnetic induction part comes detection-sensitive motor position, a side
Face improves motor position detection accuracy；Another aspect complete machine installation settings greatly reduces armature-reaction to the shadow of motor performance
It rings and reduces costs.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of embodiment electric tool of the utility model；
Fig. 2 is the structural schematic diagram at another visual angle of electric tool shown in FIG. 1 of the utility model；
Fig. 3 is the structural schematic diagram at another visual angle of electric tool shown in Fig. 2 of the utility model；
Fig. 4 is the partial structural diagram of the electric tool shown in Fig. 3 of the utility model；
Fig. 5 is another visual angle partial structural diagram of the electric tool shown in Fig. 4 of the utility model；
Fig. 6 is the circuit diagram of the electric tool shown in FIG. 1 of the utility model；
Fig. 7 is a kind of embodiment EMI element circuitry figure of the electric tool shown in fig. 6 of the utility model；
Fig. 8 is the electric tool brushless motor commutation principle of the utility model.
Specific embodiment
Specific introduce is made to the utility model below in conjunction with the drawings and specific embodiments.
It is the embodiment electric tool of the utility model, such as hand-held circular saw comprising shell referring to figs. 1 to shown in Fig. 5
10, handle 12, bottom plate 54, brushless motor 51 and circuit board 55.
The hand-held circular saw has the output shaft 101 of saw blade, connection to have motor 51 including saw blade (not shown), connection
Motor shaft 511 and bottom plate 54, insole board 54 are arranged to contact workpiece to be cut；Saw blade has cutting surfaces,
The cutting surfaces of the saw blade are roughly parallel to cut direction.Connection has the output shaft of saw blade drivingly coupled by transmission device
Onto motor shaft 511.In the embodiments of the present invention, the output shaft 101 and the motor shaft 511 that connection has saw blade are substantially
It is arranged in parallel, transmission device can be the output shaft 101 of primary transmission mechanism or the above transmission mechanism of second level to couple band saw blade
Deceleration, speedup or constant-speed transmission between motor shaft 511.In addition, in some other embodiment of the utility model, connection
There is the output shaft 101 of saw blade to be not necessarily arranged substantially in parallel with the motor shaft 511, it can also be with output shaft 101 and the electricity
The substantially vertical setting of arbor 511, or connection have the output shaft 101 of saw blade to be obliquely installed with the motor shaft 511, are not herein
It is limited.
It please refers to shown in Fig. 3 and Fig. 4, the hand held electric tool of the utility model, including shell 10, the shell 10 has
There is a cavity, the brushless motor 51 is mounted in shell 10.Specifically, 10 cavity of shell, divides into electric machine casing 111
With non-electric machine casing 112.The brushless motor 51, is mounted in electric machine casing 111, and 111 shape of electric machine casing is sleeve configuration,
It is configured to the appearance profile of adaptation brushless motor.In the embodiments of the present invention, circuit board 55 and motor-drive circuit
106, it is mounted in non-electric machine casing 112, non-112 shape of electric machine casing is flat cell type, is configured to adapter circuit plate 55 and motor
Driving circuit 106.
In the embodiments of the present invention, the brushless motor 51 is determined with rotor, at least three-phase windings 605
Son and above-mentioned motor shaft 511, wherein the rotor is mounted on motor shaft 511.In the prior art, the motor is along electricity
It is provided with electromagnetic induction element on rear side of one end that arbor extends, that is, rotor, electromagnetic induction element is rotatably installed in motor
On axis, the operating position of brushless electric motor rotor is incuded, to generate commutation signal control motor rotation according to rotor-position signal.
As shown in figure 4, the brushless motor 51 has the first end or front end along motor shaft extending direction and close to saw blade
602；With far from the saw blade second end opposite with first end or rear end 604, and have edge perpendicular to motor shaft extending direction and
With the front side 609 of the cut direction substantially parallel direction of saw blade and the rear side opposite with front side.In the utility model embodiment
In, the saw blade, bottom plate 54 are located at the front end 602 of motor 51；And the circuit board 55, motor-drive circuit 106 are then located at electricity
The front side 609 of machine.In the utility model embodiment as shown in Figures 1 to 5, the circuit board 55 is not on motor shaft
On rear end on 511 extending directions, but it is arranged in the front side of motor 609.The handle 12 of electric tool is located at the center of gravity of complete machine
On or near position, to the position of centre of gravity during balance electric tool in operation NOR operation, such user is held
Feel and the experience property for holding electric tool are good.
In the embodiments of the present invention, the electric tool has AC AC power source plug 90, and the plug connects
It receives 85V ~ 265V AC power source to input, for the direct current compared to electric tool 12V ~ 60V or so, 85V ~ 265V AC power source is
High voltage input, high voltage input require motor and position detection higher, existing electromagnetic induction element and position sensing plate
Or position sensor has sensing mode to carry out motor position detection, one side detection accuracy is inadequate, another aspect position sensing plate
Or position sensor is limited vulnerable to temperature etc., cannot be operated in extreme temperature or environment.Certainly, in some other implementation
In example, the electric tool does not have AC AC power source plug, but is equipped with the battery pack of output direct current；Powerful
In electric tool, be powered using multiple battery packs, such as at least two battery packs be installed, at this time each battery pack, motor,
And the location arrangements needs of circuit board rethink that multiple battery packs can export 56V ~ 120V DC current.Electric tool
At least one handle or 2 handles are arranged near the machine gravity position of electric tool, to balance electric tool in operation
Position of centre of gravity in journey or in non-operation process, the feel and experience property of user's gripping electric tool are good.
Such as Fig. 4, in the utility model embodiment, the motor-drive circuit 106, including switching component 1061, if
It is set to driving motor, the motor-drive circuit 106 is mounted on circuit board 55, and the setting of circuit board 55 is powered on along cut direction
In down side 609, that is, region between motor 51 and implement handle 12.Having sensing mode in the prior art is by electromagnetism sense
It answers element and sensing plate or sensor is arranged in the back-end region of the motor shaft of the motor, this thoughts side of the prior art
Formula in such a way that motor shaft rear end is arranged in come the rotation position of detection-sensitive motor in electromagnetic induction element and sensing plate or sensor,
The armature-reaction that electromagnetic induction generates can have adverse effect on motor performance.That is, in the utility model embodiment,
Without electromagnetic induction element in rotor rear ends 10mm, and the phase line only drawn by the winding 605 on motor stator with
Circuit board 55 is connected to acquire the terminal voltage signal of motor and/or current signal and obtain motor rotor position, for reasonably cloth
Influence of the armature-reaction to motor 51 is reduced in the position of circuits plate 55, and due to bigger using the board area of high pressure,
Therefore be mounted on the front side 609 of motor 51, i.e., in the region between motor 51 and handle 12.
The motor 51 is only drawn and the joining several phase lines of at least three-phase windings 605 of the stator, the electricity
Several phase lines of machine 51 are connected to circuit board 55.With reference to Fig. 4 and Fig. 5, in the embodiments of the present invention, the motor 51
Stator there are three-phase windings 605, it is only being drawn from motor 51 with 605 joining three phase lines of stator three-phase windings, even
It is connected to each electrical contact on circuit board 55.In some other possible embodiment of the utility model, the motor 51
Stator has several phase windings etc., not necessarily three-phase windings, is not limited herein；But the harness drawn on motor,
Other than the phase line that the winding of stator is drawn, without other harness, compare for having the electric tool inside of electromagnetic induction element,
Other harness are had no other than several phase lines only drawn, and are equipped on the motor shaft of rotor and electromagnetic induction is no longer installed
Element greatly reduces influence of the armature-reaction to motor performance, provides high pressure that is a kind of compact-sized and simplifying without electrification
Power driven tools.
Circuit board 55, including controller or control chip, the circuit board controller or control chip 140, pass through circuit
The each electrical contact being connected on plate 55 with several phase lines of motor 51 acquires terminal voltage signal in 51 several phase lines of motor
And/or current signal obtains motor rotor position, and then generates commutation signal and carry out the control operating of motor 51.
Referring to FIG. 6, the electric tool for the utility model above-described embodiment is electric using the system without electromagnetic induction element
Lu Tu, the AC AC power source plug of electric tool, the preferably input of reception 110V ~ 230V AC AC power source, and access EMI member
Part 101 is filtered, and wherein EMI element 110 is mainly by X capacitor, Y capacitance, the passive elements such as common mode inductance composition, then passes through
AC/DC converting unit 120 is single-phase uncontrollable rectifier bridge, is converted to DC direct current, capacitor is filtered DC direct current.DC
Direct current a part is connected to motor-drive circuit 106, that is, three phase power circuit, exports as power source to motor 51；Separately
A part generates Vcc power supply through power-switching circuit 130, powers to the controller 140 on circuit board 55.Motor-drive circuit
106 i.e. three phase power circuit, is connected by tri- phase lines of U, V, W with three-phase direct-current brushless motor 51.
Control logic using system circuit diagram as shown in FIG. 6 is as follows: analog-digital conversion function module is had in controller,
The AD Sampling Interface for referring to single-chip microcontroller is believed by terminal voltage signal in three-phase U, V, W phase line on acquisition brushless motor and/or electric current
Number, by the position estimation unit in controller, that is, program software is realized, commutation signal is calculated, in control unit
Primary control program according to commutation signal and other function needs, generate the driving logic of six power devices, drive logic through driving
Moving cell amplification generates actual driving signal Q1, Q2, Q3, Q4, Q5, Q6 driving motor driving circuit, i.e., in power circuit
Six switching devices carry out turn-on and turn-off switching, and then generate commutation signal and carry out control motor operating.It should be noted that
The controller obtains the signal that the end voltage in phase line generates and carries out estimation motor rotor position, wherein the end in the phase line
Voltage is determined by corresponding to the difference in phase line between voltage and DC- in Fig. 6.End voltage in the phase line has with counter electromotive force
It closes, but not equal to the potential difference between two phase lines such as phase line U and phase line V.Herein, why the controller uses phase line upper end
Voltage rather than the potential difference in two phase lines are because the potential difference in two phase lines can not be obtained accurately in motor operating.
Referring to FIG. 7, being a kind of embodiment EMI element circuitry figure of the utility model.Above-mentioned access 110V ~ 230V AC is handed over
At work, there are turning on and off for high frequency switching device for the electric tool of galvanic electricity, will cause the mutation of voltage or current,
To generate common mode interference and DM EMI.In order to mitigate and inhibit these electromagnetic interferences to power grid and other electronic equipments
It influences, EMI element as shown in Figure 7 need to be used, be mainly made of the Resistor-Capacitor Unit for meeting safety requirement, wherein fuse conduct
The overcurrent protection of tool.Protection device of the varistor as votage limit type can reduce the mutation of AC power supplies transient voltage to circuit
Influence.Two Y capacitances C1, C2 can play the role of inhibiting common mode interference, guide to ground for common mode interference signal.Two X electricity
Hold the inhibition DM EMI played the role of.Common mode inductance only plays inhibiting effect to common-mode interference current, and to normal work
Electric current does not work.
It is the utility model embodiment brushless motor commutation operating principle with reference to Fig. 8, it is as follows: three phase BLDC brushless motor
Six bats control is generallyd use, i.e. the one 360 ° electric periods are equally divided into six 60 ° of sections, there are two phase winding works in each section
Make, one communicates positive current, and one communicates negative current.By taking 0-60 ° of section as an example, in the section, six power in motor-drive circuit
Guan Zhong, switching component Q5Q4 conducting, the shutdown of rest switch pipe.V communicates negative current at this time, and W communicates positive current.The end electricity of three-phase
Be pressed with following rule: the end voltage of V phase is that 0, W phase terminal voltage is UDC, U phase is used as floating phase, monitor its terminal voltage signal and/
Or current signal, rule are an oblique line (UDCThe back-emf of/2+U phase), we take UDC/ 2 for a key signal position export to
The position estimation unit of controller, the back-emf of U phase is 0 at this time, and next section can be obtained in 30 electrical angles that are delayed again at this time
The commutation moment.When reaching the commutation moment in next section, then driving switch component logic Q5Q4 is switched to Q1Q4, at this time UW
It mutually works, we monitor the terminal voltage signal and/or current signal of V phase again at this time, and acquisition V phase terminal voltage is UDCAt/2 moment, prolong
When handle to obtain the commutation moment in next section.And so on, it can be achieved that motor driven commutation carries out normal rotary work.
The electric tool of the utility model second embodiment uses high pressure AC AC power source plug 90, receives 85V ~ 265V
High-voltage ac power input, the preferably input of reception 110V ~ 230V AC AC power source；In some other embodiment, electric tool
High pressure DC direct current, such as the high-voltage DC power supply being made of multiple battery packs can be used, can be the straight of at least 56V or more
Galvanic electricity is not limited herein.
Using the high-voltage brushless electric tool of above-mentioned second embodiment, it is no longer necessary to which magnetic induction part comes detection-sensitive motor position
It sets, on the one hand improves motor position detection accuracy；Another aspect complete machine installation settings greatly reduces armature-reaction to motor
The influence of performance simultaneously reduces costs.
The basic principles and main features and advantage of the utility model have been shown and described above.The technical staff of the industry
It should be appreciated that above-described embodiment does not limit the utility model in any form, it is all by the way of equivalent substitution or equivalent transformation
Technical solution obtained, all falls in the protection scope of the utility model.
Claims (6)
1. a kind of electric tool, comprising:
Shell has cavity, and the shell includes electric machine casing and non-electric machine casing；
Motor shaft；
Brushless motor is mounted in electric machine casing, and the motor includes rotor and the stator at least three-phase windings, and described turn
Son is mounted on motor shaft；
Circuit board, including controller, the circuit board are mounted in non-motor casing body；
Motor-drive circuit, including switching component, the motor-drive circuit installation on circuit boards, are arranged to driving electricity
Machine；
AC AC power source plug, the plug receive the input of 85V ~ 265V AC power source；
AC/DC converting unit, is attached to the AC AC power source plug and output DC direct current supplies electricity to the motor-drive circuit；
Wherein, the motor only draws several phase lines of connection corresponding at least three-phase windings of the stator, the motor
Several phase lines are connected to circuit board, via circuit board controller acquisition several phase lines of motor on terminal voltage signal and/or
Current signal obtains motor rotor position.
2. electric tool as described in claim 1, it is characterised in that: the electric tool includes the output that connection has saw blade
Axis, the output shaft are driveably connected on motor shaft by transmission device, and are arranged in parallel with the motor shaft.
3. a kind of electric tool, comprising:
Shell has a cavity；
Motor shaft；
Brushless motor is mounted in shell, and the motor includes rotor and the stator at least three-phase windings, the rotor peace
On motor shaft, wherein the motor has opposite front side and rear side, and with before the extension of motor axis direction
End, the rear end opposite with front end；
Circuit board, including control chip；
Motor-drive circuit, including switching component, the motor-drive circuit installation on circuit boards, are arranged to driving electricity
Machine；
AC AC power source plug, the plug receive at least 85V AC power source and input；
AC/DC converting unit, is attached to the AC AC power source plug and output DC direct current supplies electricity to the motor-drive circuit；
Wherein, the front side of the brushless motor is arranged in the motor-drive circuit and circuit board；
Wherein, the motor only draw with the joining several phase lines of at least three-phase windings of the stator, if the motor
Dry root phase line is connected to circuit board, via circuit board control chip acquisition several phase lines of motor on terminal voltage signal and/or
Current signal obtains motor rotor position；
Wherein, the rear end of the motor cooperates detection-sensitive motor axis without magnetic induction part and position sensing plate or position sensor
Rotary motion.
4. electric tool as claimed in claim 3, it is characterised in that: the electric tool includes an output shaft, the output
Axis is driveably connected on motor shaft by transmission device, and is arranged in parallel with the motor shaft.
5. a kind of electric tool, comprising:
Shell has a cavity；
Motor shaft；
Brushless motor is mounted in shell, and the motor includes rotor and the stator at least three-phase windings, the rotor peace
On motor shaft；
Circuit board, including control chip；
Motor-drive circuit, including switching component, the motor-drive circuit installation on circuit boards, are arranged to drive brushless
Motor；
Wherein, the motor only draw with the joining several phase lines of at least three-phase windings of the stator, if the motor
Dry root phase line is connected to circuit board, via circuit board control chip acquisition several phase lines of motor on terminal voltage signal and/or
Current signal obtains motor rotor position.
6. electric tool as claimed in claim 5, it is characterised in that: the electric tool includes an output shaft, the output
Axis is driveably connected on motor shaft by transmission device, and is arranged in parallel with the motor shaft.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2017107097779 | 2017-08-18 | ||
| CN201710709777 | 2017-08-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208961121U true CN208961121U (en) | 2019-06-11 |
Family
ID=66753164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821320400.0U Active CN208961121U (en) | 2017-08-18 | 2018-08-15 | Electric tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208961121U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021031138A1 (en) * | 2019-08-21 | 2021-02-25 | 南京德朔实业有限公司 | Ac power tool and method for startup thereof |
-
2018
- 2018-08-15 CN CN201821320400.0U patent/CN208961121U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021031138A1 (en) * | 2019-08-21 | 2021-02-25 | 南京德朔实业有限公司 | Ac power tool and method for startup thereof |
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Address after: 211106 No. 529, 159, Jiangjun Avenue, Jiangning District, Nanjing, Jiangsu Province Patentee after: Nanjing Quanfeng Technology Co.,Ltd. Address before: No. 529, Jiangjun Avenue, Jiangning Economic and Technological Development Zone, Nanjing, Jiangsu Province Patentee before: NANJING CHERVON INDUSTRY Co.,Ltd. |