CN106487192A - Electric tool - Google Patents
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- CN106487192A CN106487192A CN201510557759.4A CN201510557759A CN106487192A CN 106487192 A CN106487192 A CN 106487192A CN 201510557759 A CN201510557759 A CN 201510557759A CN 106487192 A CN106487192 A CN 106487192A
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Abstract
The invention discloses a kind of electric tool, including：Brushless electric machine, including rotor and at least two-phase stator winding；Drive system, for driving brushless electric machine；Wherein, drive system includes：Drive circuit, for driving brushless electric machine；Position sensor, for detecting the position of rotor；Controller, according to the signal control drive circuit of position sensor；The rotor of brushless electric machine is sequentially passed through when rotating forward：Commutation position, the now signal change of at least one of brushless electric machine level sensor；Reference position, now the counter electromotive force of at least phase stator winding in brushless electric machine in back emf waveform point midway；The span of the angle that commutation position is differed in electrical angle with reference position is 20 ° to 40 °；Brushless electric machine performance is made to get a promotion by the setting of position sensor.
Description
Technical field
The present invention relates to a kind of electric tool, and in particular to a kind of electric tool of employing brushless electric machine.
Background technology
Brush motor is typically made up of motor itself and respective drive circuit, and brushless electric machine compares that its running noise for brush motor is low and the life-span is longer.In general, distinguishing according to whether the sensor with detection rotor-position, brushless electric machine is divided into the brushless electric machine of thoughts control and the brushless electric machine of noninductive control.
For thoughts control, the position of position sensor is arranged and its cooperation with control method, is the key factor for affecting brushless electric machine performance.
Content of the invention
A kind of electric tool, including：Brushless electric machine, including rotor and at least two-phase stator winding；Drive system, for driving brushless electric machine；Wherein, drive system includes：Drive circuit, for driving brushless electric machine；Position sensor, for detecting the position of rotor；Controller, according to the signal control drive circuit of position sensor；The rotor of brushless electric machine is sequentially passed through when rotating forward：Commutation position, the now signal change of at least one of brushless electric machine level sensor；Reference position, now the counter electromotive force of at least phase stator winding in brushless electric machine in back emf waveform point midway；The span of the angle that commutation position is differed in electrical angle with reference position is 20 ° to 40 °.
Further, reference position and immediate commutation position difference angle span in physical angle is the number of pole-pairs of 20 °/P to 40 °/P, wherein P for brushless electric machine.
Further, the number of stator winding is 3, and 3 stator winding constitute Y-shaped connection.
Further, the number of stator winding is 3, and 3 stator winding constitute triangular form connection.
Further, when drive circuit drives rotor to rotate forward, primary importance and the second place are turned over successively, when rotor goes to primary importance, primary importance sensor signal changes, and drive circuit switches to the first forward drive state, when rotor goes to the second place, second place sensor signal changes, and drive circuit switches to the second forward drive state；When drive circuit drives rotor to rotate backward, when rotor goes to the second place, second place sensor signal changes, drive circuit switches to the first reverse drive state, when rotor goes to primary importance, primary importance sensor signal changes, and drive circuit switches to the second reverse drive state；Drive circuit first be driven reverse state when to rotor apply voltage with first be driven forward state when to rotor applying voltage in opposite direction.
Another kind of electric tool, including：Brushless electric machine, including rotor and threephase stator winding；Drive system, for driving brushless electric machine；Wherein, brushless electric machine is provided with：Three winding connection terminals, for making stator winding and external connection；Drive system includes：Drive circuit, for driving brushless electric machine；Position sensor, for detecting the position of rotor；Controller, according to the signal control drive circuit of position sensor；The voltage of winding connection terminal is defined as line voltage；The rotor of brushless electric machine is sequentially passed through when rotating forward：Commutation position, the now signal change of at least one of brushless electric machine level sensor；Reference position, now the line voltage of at least one of brushless electric machine winding connection terminal in line voltage waveform point midway；The span of the angle that commutation position is differed in electrical angle with reference position is 20 ° to 40 °.
Further, reference position and immediate commutation position difference angle span in physical angle is the number of pole-pairs of 20 °/P to 40 °/P, wherein P for brushless electric machine.
Further, 3 stator winding constitute Y-shaped connection.
Further, 3 stator winding constitute triangular form connection.
Further, when drive circuit drives rotor to rotate forward, primary importance and the second place are turned over successively, when rotor goes to primary importance, primary importance sensor signal changes, and drive circuit switches to the first forward drive state, when rotor goes to the second place, second place sensor signal changes, and drive circuit switches to the second forward drive state；When drive circuit drives rotor to rotate backward, when rotor goes to the second place, second place sensor signal changes, drive circuit switches to the first reverse drive state, when rotor goes to primary importance, primary importance sensor signal changes, and drive circuit switches to the second reverse drive state；Drive circuit first be driven reverse state when to rotor apply voltage with first be driven forward state when to rotor applying voltage in opposite direction.
Above scheme can improve the performance of brushless electric machine.
Description of the drawings
Fig. 1 is the schematic block diagram for the electric tool as embodiment；
Fig. 2 is the schematic diagram of an embodiment of brushless electric machine in electric tool shown in Fig. 1；
Fig. 3 is the schematic diagram of a peripheral circuit of brushless electric machine shown in Fig. 2；
Fig. 4 is the schematic diagram of another embodiment of brushless electric machine in electric tool shown in Fig. 1；
Fig. 5 is the schematic diagram of the position of electric tool Position Sensor shown in Fig. 1；
Sensor signal shown in Fig. 5 and interval corresponding relation schematic diagram during Fig. 6；
Fig. 7 is the phase voltage waveform schematic diagram of scheme shown in Fig. 2；
Fig. 8 is the line voltage waveform diagram of scheme shown in Fig. 2；
Fig. 9 is the line voltage waveform diagram of scheme shown in Fig. 4；
Figure 10 is the moment of torsion and rotation speed relation curve map that the scheme that the scheme of 20 ° of advanced for position sensor electrical angle and position sensor are arranged at reference position is compared；
Figure 11 is the moment of torsion and current relationship curve map that the scheme that the scheme of 20 ° of the advanced electrical angle of position sensor is arranged at reference position with position sensor is compared；
Figure 12 is the moment of torsion and rotation speed relation curve map that the scheme that the scheme of 40 ° of advanced for position sensor electrical angle and position sensor are arranged at reference position is compared；
Figure 13 is the moment of torsion and current relationship curve map that the scheme that the scheme of 40 ° of the advanced electrical angle of position sensor is arranged at reference position with position sensor is compared.
Specific embodiment
Make specific introduction to the present invention below in conjunction with the drawings and specific embodiments.
Electric tool as shown in Figure 1 includes：Brushless electric machine, drive system and power module.
Wherein, brushless electric machine includes：Rotor and at least two-phase stator winding.
Drive system is used for driving brushless electric machine to rotate.Specifically, drive system includes：Position sensor, controller and drive circuit.
Position sensor is used for detecting the position of rotor, more specifically, when rotor turns to the preset range that can be detected by position sensor, position sensor is in a kind of signal condition, and when rotor produces preset range, position sensor switches to another kind of signal condition.
Generally speaking in order to learn the position of rotor, the preset range of position sensor is less, the more rotors that can be drawn of number position is more accurate.But in fact, due to only needing to know commutation position when brushless electric machine drives, in other words, the setting of position sensor only needs to reflect the commutation position of rotor on signal.
Used as a kind of implementation, as shown in figure 5, three position sensors D1, D2, D3 can be adopted, the scope that position sensor can be detected by is the scope of 180 ° of physical angle, and when rotor is proceeded to and produces the scope, position sensor signal changes.When rotor proceeds to preset range, the signal definition of position sensor is 1, and when being located at outside the preset range, the signal definition of position sensor is 0.By 180 ° of physical angle apart for these three position sensors, as shown in Figure 6, when the rotor is turning, it will six kinds of signal spacings are produced, occur six different signal combinations 100,110,010,011,001,101 according to the order of D1, D2, D3 if signal sorts.So just can learn rotor in that position range according to the combination of the signal of three position sensors D1, D2, D3.Even if it should be noted that the number of pole-pairs of rotor increases, for one of them extremely to for, the detection of position is identical, different is to be only the physical angle that have compressed the reality corresponding to an electric cycle.
From the point of view of scheme shown in Fig. 5, as long as making the physical angle between adjacent position sensor less than the physical angle that position sensor can be detected by, can be overlapped by test position but the different signal group of different interval correspondences.
For the brushless electric machine with three-phase windings, which has six driving beats within an electric cycle（One driving condition of corresponding drive circuit）Corresponding to combining with the signal produced by scheme as shown in Figure 5, so when the signal combination of position sensor changes, the brushless electric machine can execute a commutation action.
Specifically, the sensor that position sensing implement body can be made using Hall element.
Controller is used for the signal control drive circuit according to position sensor.Controller can receive the signal of position sensor, then according to the signal control drive circuit of position sensor, make drive circuit switch driving condition.
Drive circuit is used for driving brushless electric machine, and specifically, drive circuit includes multiple semiconductor switch, and they can change conducting state according to the signal of controller, so as to change the voltage status that power module is carried on brushless electric machine winding.In order that brushless electric machine is rotated, drive circuit has multiple driving conditions, under a driving condition, the stator winding of brushless electric machine can produce a magnetic field, and controller control drive circuit switching driving condition makes the magnetic field rotation that stator winding is produced both drive rotor to rotate the driving that realizes to brushless electric machine.
By taking the brushless electric machine shown in Fig. 2 as an example, which has three-phase windings u, v, the w for constituting Y-shaped connection；Their wherein one end are connected to neutral point O, and their other end A, B, C draws brushless electric machine respectively as winding connection end and be connected to the winding connection terminal that brushless electric machine is provided with（In figure is not shown）, drive circuit and other external circuits can connect terminals A, B, C of three-phase windings u, v, w by winding connection terminal.In order to drive the brushless electric machine shown in Fig. 2, drive circuit at least has 6 driving conditions（Determined by the number of phases of stator winding）For convenience of explanation, hereinafter the terminals that connects are corresponded to driving condition and represent driving condition, such as, drive circuit makes terminals A, B access power supply, represented with AB if the driving condition if A is high-pressure side, represented with BA if the driving condition if B is high-pressure side, so represent that driving condition mode is equally applicable to the scheme that the triangular form shown in Fig. 4 connects.In addition, the switching of driving condition can also be referred to as the commutation action of brushless electric machine.
Scheme shown in Fig. 2, drive circuit can be sequentially output six driving conditions of AB, AC, BC, BA, CA, CB when driving.
Shown in the mapping table 1 that hypothesis driving condition is combined with position sensor signal：
| Signal is combined | Driving condition |
| 101 | AB |
| 100 | AC |
| 110 | BC |
| 010 | BA |
| 011 | CA |
| 001 | CB |
Table 1
According to such corresponding relation, signal combination change is detected in controller and control drive circuit switching driving condition to can achieve the driving to brushless electric machine.
In a practical situation, as control always controls afterwards, so when rotor rotates the position for needing to switch driving condition, often having little time control, this can affect the performance of the performance of brushless electric machine.
In order to eliminate as much as delay, enable commutation corresponding with rotor-position, the method that can proceed by the control of commutation using the physical location for being ahead of rotor.
The problem of controls in advance is：If carrying out controls in advance firstly the need of complicated software program using software and may not be reliable, it is also to need control in addition arrive what degree in advance, the not enough in advance or advanced excessive performance that can all affect brushless electric machine.
As shown in figure 5, in order to realize controls in advance, can be by the position of set location sensor so as to which physical location is in advance and ideal position.
As shown in figure 5, dotted line represents that position sensor originally should set location（Ideal position）These positions are the actual commutation positions of correspondence, the scheme of the application makes position sensor arrange in the range of advanced 20 ° to 40 ° of these position electrical angles in set location sensor, in other words, in the range of advanced 20 °/P to 40 °/P of these position physical angle, wherein P is the number of pole-pairs of the rotor of brushless electric machine.
But for reality, in installation site sensor, there is no these dotted line positions.Therefore the position of position sensor is determined using following scheme.
Determine reference position first, so that brushless electric machine positive sky in the presence of external force is circled, the phase voltage of its each phase winding is detected, so that it is determined that phase voltage curve, then using the position corresponding to the point midway of phase voltage curve as reference position（That is the position of dotted line frame in Fig. 5）, a then position installation site sensor on the basis of the position in the range of 20 ° to 40 ° of advanced electrical angle, the position is defined as commutation position, then according to position sensor angle remaining sensor of interval setting.
As now phase voltage is produced by counter electromotive force, so now phase voltage curve is the curve of back emf waveform, reference position is also the point midway of phase back-emf waveform.
After being configured so that, the rotor of brushless electric machine can sequentially pass through commutation position and reference position when rotating forward, and when through commutation position, now the signal of at least one of brushless electric machine level sensor changes, and triggers commutation action；So that rotor being capable of commutation in time.
It should be noted that point midway referred herein refers to the position corresponding to back emf waveform midpoint, because the waveform is periodically variable, each can be by one side（Or it is positive or negative）Waveform position in time corresponding to point midway, if consideration waveform change in the ideal situation, unilateral waveform is relative symmetrical by the straight line at midpoint, and the straight line is defined as center line.
And electrical angle scope referred herein should be the span of reference position and immediate advanced commutation position, rather than the scope with all of commutation position.Physical angle scope is also such.
As shown in Figure 7, by taking phase voltage U1 of u phase stator winding in Fig. 2 as an example, assume that phase voltage U1 is 0 when rotor is at the beginning of rotation, as figure shows, when rotating one week, phase voltage U1 is divided into positive and negative two parts to rotor, they respectively account for 180 °, wherein 90 ° position m1 are one of point midway of the waveform, before position sensor being arranged on the position corresponding to point midway in the scope of 20 ° to 40 ° of electrical angle, i.e., the region that n1 is represented shown in Fig. 7.M2 is another point midway of the waveform, and its part that is born by waveform is determined, can determine, according to the point, the region that n2 is represented in the same manner.
As the scheme shown in Fig. 2 has three-phase windings, so the physical location according to corresponding to three-phase can determine six point midways together, so that it is determined that actually making 6 commutation positions that position sensor signal combination changes.
Phase voltage U2 curve shown in Fig. 8 can be used for determining advance position, be identical reason with Fig. 7.Line voltage determines that the advantage of position is to use peripheral circuit.
As shown in Figure 2, stator winding u, v, w are due to being located inside brushless electric machine, need by extra detection circuit if necessary to detection phase voltage, concrete as shown in Figure 3, be respectively connecting to each terminals A, B, C and make their other ends connection simulation neutral point O by being made up of circuit resistance R1, R2, R3 ' can detect or model stator winding u, v, w motor internal voltage condition, than phase voltage U1 if desired for electronics winding u phase, just phase voltage U1 is drawn or converse by the voltage at detection AO ' two ends.Therefore phase voltage curve can be determined by the detection circuit.
In order to cost-effective, it would however also be possible to employ determine reference position in the way of line voltage.Voltage between stator winding u, v, w any two terminals is defined as line voltage, because they are can to obtain at the binding post of brushless electric machine.
Similar, using the position corresponding to the point midway of line voltage wavy curve as reference position.
For the scheme shown in Fig. 4, the brushless electric machine is by needing to switch six different driving conditions within an electric cycle, its only winding connection mode different, which is also required to controls in advance, and the targeted detection object rotor of controls in advance is unrelated with winding connection mode, so above scheme is also applied for the scheme shown in Fig. 4.Difference is that scheme phase voltage U3 shown in Fig. 4 and line voltage U4 are identicals.
In addition curve is the curve of line voltage U4 of scheme shown in Fig. 4 as shown in Figure 9, connects for triangle, and its line voltage U4 and phase voltage U3 are identicals.So winding connection is different, but be not different for rotor and position sensor, be equally switching that three-phase needs also exist for 6 drive patterns, thus for triangle connection can also above method realize the determination of advance position.
With reference to shown in Figure 10 and Figure 11, with rotating speed and moment of torsion, the moment of torsion of the scheme that the scheme of 20 ° of advanced for position sensor electrical angle and position sensor are arranged at reference position is detected that with current relationship testing result is as shown in the figure.
With reference to shown in Figure 12 and Figure 13, with rotating speed and moment of torsion, the moment of torsion of the scheme that the scheme of 40 ° of advanced for position sensor electrical angle and position sensor are arranged at reference position is detected that with current relationship testing result is as shown in the figure.
As shown in Figure 10, wherein solid line is the curve of the scheme of 20 ° of the advanced electrical angle of position sensor, dotted line is the curve of the scheme for not doing advanced setting, knowable to testing result, in low torque, the scheme rotating speed of solid line is higher than dotted line scheme, for electric tool, such as electric screwdriver, it is often desirable to quickly screw so as to time-consuming in low torque, also there is similar demand in other electric tools, it can be seen that solid line version is obtained in that higher rotating speed.In high torque, that is, when corresponding to electric tool heavy duty, dotted line scheme rotating speed declines substantially, and solid line version then improves such case.
As shown in figure 12, wherein solid line is the curve of the scheme of 40 ° of the advanced electrical angle of position sensor, and dotted line is the curve of the scheme for not doing advanced setting, and which is similar with the situation of Figure 10.40 ° of the advanced electrical angle of position sensor can also improve the rate performance of motor.
As shown in figure 11, wherein solid line is the curve of the scheme of 20 ° of the advanced electrical angle of position sensor, dotted line is the curve of the scheme for not doing advanced setting, knowable to testing result, in heavy duty, dotted line scheme electric current rises very fast, and solid line version is then more gentle, and the scheme of this 20 ° of advanced electrical angle of explanation position sensor in security and prevents the aspect effect such as motor overheating more preferable in heavy duty.
As shown in figure 13, wherein solid line is the curve of the scheme of 40 ° of the advanced electrical angle of position sensor, dotted line is the curve of the scheme for not doing advanced setting, and knowable to testing result, the scheme of 40 ° of the advanced electrical angle of position sensor equally has the effect that heavy duty reduces electric current.
As known from the above, advanced electrical angle can be made to motor performance and being effectively improved in the range of 20 ° to 40 °.
In addition through our detections, advanced deficiency is may result in if being less than 20 ° in advance, it is impossible to realize the effect of compensation, motor can be made to be difficult to start if being more than 40 ° in advance.In order to obtain better performance improvement, advanced electrical angle can be narrowed down in the range of 25 ° to 35 ° further, and through detection, motor operation effect is preferable within the range.
Above scheme when rotating forward, due to position sensor hardware location advanced, improve the performance of brushless electric machine；But in reversion, the hardware location of position sensor is equivalent to delayed and physical location, then is superimposed because of control and brings delay, in reversion, not only performance reduces motor, and winding current can increase, and affect the brushless electric machine life-span.
As a solution, when drive circuit drives rotor to rotate forward, primary importance and the second place are turned over successively, when rotor goes to primary importance, primary importance sensor signal changes, and drive circuit switches to the first forward drive state, when rotor goes to the second place, second place sensor signal changes, and drive circuit switches to the second forward drive state；
When drive circuit drives rotor to rotate backward, when rotor goes to the second place, second place sensor signal changes, drive circuit switches to the first reverse drive state, when rotor goes to primary importance, primary importance sensor signal changes, and drive circuit switches to the second reverse drive state；
Drive circuit first be driven reverse state when to rotor apply voltage with first be driven forward state when to rotor applying voltage in opposite direction.
Further, under rotor rotating forward state, when position sensor signal changes again, drive circuit switches to the 3rd forward drive state by the second forward drive state；3rd is driven forward state is driven reverse state for identical driving condition with second.
Under rotor inverted status, when position sensor signal changes again, the drive circuit switches to the 3rd reverse driven state by second reverse driven state；Described 3rd is driven reverse state is driven forward state for identical driving condition with described second.
Specifically as shown in table 2, table 2 is by taking the brushless electric machine of three-phase windings as an example.
| Signal is combined | Forward drive state | General reverse driven state | Advanced reverse driven state |
| 101 | AB | BA | BC |
| 100 | AC | CA | BA |
| 110 | BC | CB | CA |
| 010 | BA | AB | CB |
| 011 | CA | AC | AB |
| 001 | CB | BC | AC |
Table 2
Assume that first is driven forward state AB, second is driven forward state AC；According to general control, CA and BA should be sequentially output in reversion（During reversion, signal sequence is 100,101）, due to reason just described, such reversion control will be more delayed, so as to affect the performance of brushless electric machine.
In order to overcome this defect, as solution, in reversion, the driving condition for being exported reversion be to should signal group close rotating forward when driving condition a upper driving condition inverse state（It is in opposite direction that voltage applies）.
In conjunction with table 2, the program is in reversion, when if signal is combined 100 its do not export inverse state CA of 100 corresponding forward drive states AC, but output is driven forward inverse state BA of upper one forward drive state AB of dress AC, so in reversion, advance angle can also be realized to controlling delayed compensation, performance and security during so as to ensureing to invert.
The basic principles, principal features and advantages of the present invention have been shown and described above.It should be understood by those skilled in the art that, the invention is not limited in any way for above-described embodiment, all technical schemes obtained by the way of equivalent or equivalent transformation, all falls within protection scope of the present invention.
Claims (10)
1. a kind of electric tool, including：
Brushless electric machine, including rotor and at least two-phase stator winding；
Drive system, for driving the brushless electric machine；
Wherein,
The drive system includes：
Drive circuit, for driving the brushless electric machine；
Position sensor, for detecting the position of the rotor；
Controller, controls the drive circuit according to the signal of the position sensor；
The rotor of the brushless electric machine is sequentially passed through when rotating forward：
Commutation position, the now signal change of at least one of described brushless electric machine level sensor；
Reference position, now in the brushless electric machine at least described in a phase stator winding counter electromotive force in back emf waveform point midway；
The span of the angle that the commutation position is differed in electrical angle with the reference position is 20 ° to 40 °.
2. electric tool according to claim 1, it is characterised in that：
Difference angle span in physical angle is the number of pole-pairs of the brushless electric machine for 20 °/P to 40 °/P, wherein P with immediate commutation position for the reference position.
3. electric tool according to claim 1, it is characterised in that：
The number of the stator winding is 3, and 3 stator winding constitute Y-shaped connection.
4. electric tool according to claim 1, it is characterised in that：
The number of the stator winding is 3, and 3 stator winding constitute triangular form connection.
5. electric tool according to claim 1, it is characterised in that：
When the drive circuit drives the rotor to rotate forward, primary importance and the second place are turned over successively, when the rotor goes to primary importance, primary importance sensor signal changes, the drive circuit switches to the first forward drive state, when the rotor goes to the second place, second place sensor signal changes, and the drive circuit switches to the second forward drive state；
When the drive circuit drives the rotor to rotate backward, when the rotor goes to the second place, the second place sensor signal changes, the drive circuit switches to the first reverse drive state, when the rotor goes to primary importance, the primary importance sensor signal changes, and the drive circuit switches to the second reverse drive state；
The drive circuit described first be driven reverse state when to the rotor apply voltage with described first be driven forward state when to the rotor applying voltage in opposite direction.
6. a kind of electric tool, including：
Brushless electric machine, including rotor and threephase stator winding；
Drive system, for driving the brushless electric machine；
Wherein,
The brushless electric machine is provided with：
Three winding connection terminals, for making the stator winding and external connection；
The drive system includes：
Drive circuit, for driving the brushless electric machine；
Position sensor, for detecting the position of the rotor；
Controller, controls the drive circuit according to the signal of the position sensor；
The voltage of the winding connection terminal is defined as line voltage；
The rotor of the brushless electric machine is sequentially passed through when rotating forward：
Commutation position, the now signal change of at least one of described brushless electric machine level sensor；
Reference position, now the line voltage of at least one of described brushless electric machine winding connection terminal in line voltage waveform point midway；
The span of the angle that the commutation position is differed in electrical angle with the reference position is 20 ° to 40 °.
7. electric tool according to claim 6, it is characterised in that：
Difference angle span in physical angle is the number of pole-pairs of the brushless electric machine for 20 °/P to 40 °/P, wherein P with immediate commutation position for the reference position.
8. electric tool according to claim 6, it is characterised in that：
3 stator winding constitute Y-shaped connection.
9. electric tool according to claim 6, it is characterised in that：
3 stator winding constitute triangular form connection.
10. electric tool according to claim 6, it is characterised in that：
When the drive circuit drives the rotor to rotate forward, primary importance and the second place are turned over successively, when the rotor goes to primary importance, primary importance sensor signal changes, the drive circuit switches to the first forward drive state, when the rotor goes to the second place, second place sensor signal changes, and the drive circuit switches to the second forward drive state；
When the drive circuit drives the rotor to rotate backward, when the rotor goes to the second place, the second place sensor signal changes, the drive circuit switches to the first reverse drive state, when the rotor goes to primary importance, the primary importance sensor signal changes, and the drive circuit switches to the second reverse drive state；
The drive circuit described first be driven reverse state when to the rotor apply voltage with described first be driven forward state when to the rotor applying voltage in opposite direction.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510557759.4A CN106487192A (en) | 2015-09-02 | 2015-09-02 | Electric tool |
| DE112016003094.0T DE112016003094T5 (en) | 2015-09-02 | 2016-08-17 | Electric tool and method for driving a brushless motor of the power tool |
| CN201680055331.2A CN109463038B (en) | 2015-09-02 | 2016-08-17 | Electric tool and driving method of brushless motor thereof |
| PCT/CN2016/095631 WO2017036303A1 (en) | 2015-09-02 | 2016-08-17 | Electric tool and drive method of brushless motor thereof |
| US15/905,028 US10256701B2 (en) | 2015-09-02 | 2018-02-26 | Electric power tool and method for driving brushless motor thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510557759.4A CN106487192A (en) | 2015-09-02 | 2015-09-02 | Electric tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106487192A true CN106487192A (en) | 2017-03-08 |
Family
ID=58238155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510557759.4A Withdrawn CN106487192A (en) | 2015-09-02 | 2015-09-02 | Electric tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106487192A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109842327A (en) * | 2017-11-24 | 2019-06-04 | 南京德朔实业有限公司 | Electric tool |
-
2015
- 2015-09-02 CN CN201510557759.4A patent/CN106487192A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109842327A (en) * | 2017-11-24 | 2019-06-04 | 南京德朔实业有限公司 | Electric tool |
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Application publication date: 20170308 |
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