CN104579054A - Motor control system for electric tool - Google Patents
Motor control system for electric tool Download PDFInfo
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- CN104579054A CN104579054A CN201410328401.XA CN201410328401A CN104579054A CN 104579054 A CN104579054 A CN 104579054A CN 201410328401 A CN201410328401 A CN 201410328401A CN 104579054 A CN104579054 A CN 104579054A
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- motor
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- control circuit
- electric machine
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Abstract
The invention discloses a motor control system for an electric tool. The motor control system comprises a motor, a control circuit module connected to the motor, an electric energy device which is connected to the control circuit module and is used for providing a power supply for the motor control system, and a motor detection device connected to the control circuit module, wherein the motor detection device is used for detecting the load parameter of the motor. The motor control system for the electric tool, provided by the invention, not only adopts additional protection design to avoid the situation that the motor is accidentally started or shut down due to faulty operation of a user, but also can control the motor to generate different dynamic power output according to actual loading situations, so that electric energy for driving the motor is economized.
Description
Technical field
The present invention relates to a kind of electric tool using motor to provide power, particularly use the electric tool that control circuit controls motor rotation wherein.
Background technology
Motor is widely used in various different electric tool as a kind of very general power drive mode, thus alternative manpower carries out all kinds of work work.Carry out operation because electric tool normally needs to be moved to different places, thus battery usually as main electricity source supply electricity to the motor in electric tool.But the control mode that traditional electric tool is taked motor is fairly simple, be only often require drive motors according to predetermined power stage.Such control mode does not consider that electric tool has load or non-loaded different situations in real work, but take single power mode output regularly, thus unnecessary power of motor output has also been carried out when not having loaded, cause the waste of battery electric quantity, the effective storage life of electric tool after shortening each charging.
On the other hand; the safeguard measure to motor do not taked usually by traditional electric tool; particularly when the various shift knob being exposed to electric tool outside is touched in user's false touch time, easily there is casual error operations, thus cause motor unexpectedly started or shut down.This misoperation frequently not only easily causes motor to produce the electricity consumed in limited power source such as battery due to frequent switch, and due to electric motor starting or the huge immediate current closing stopping time generation, the control circuit of easy motor damage and the coil-winding group of motor internal, thus cause the lost of life of equipment and maintenance cost to increase.
Summary of the invention
Therefore; The embodiment provides a kind of electric machine control system for electric tool; it not only takes extra design protection and prevents the misoperation of user from causing motor unexpectedly start or close down; and this electric machine control system can produce dynamically different capacity output according to actual loading situation control motor, thus save the electric energy for drive motors.
Specifically, the invention discloses a kind of electric machine control system for electric tool, comprise motor, be connected to this motor control circuit module, be connected to control circuit module and provide the electrical energy devices of power supply for described electric machine control system and be connected to the motor detection apparatus of control circuit module.This motor detection apparatus is for detecting the load parameter of described motor.
Preferably, described motor is brshless DC motor.
Preferably, described electric machine control system also comprises the communication module group being connected to control circuit module, and this communication module group is suitable for carrying out communication with external device.
Preferably, described electrical energy devices is lithium battery.
Preferably, described electric machine control system also comprises user's display unit, and this user's display unit comprises the multiple LED light-emitting diodes being connected to described control circuit module.
In another aspect of this invention, also disclose a kind of electric machine control system for electric tool, comprise motor, be connected to the control circuit module of this motor, be connected to control circuit module and the electrical energy devices of power supply be provided, be connected to the locking switch of control circuit module for described electric machine control system; And be connected to the main switch of control circuit module.
Preferably, described motor is brshless DC motor.
Preferably, described main switch comprises the sub-switch of multiple mutual parallel connection.
Preferably, described electric machine control system also comprises the communication module group being connected to control circuit module, and this communication module group is suitable for carrying out communication with external device.
Preferably, described electrical energy devices is lithium battery.
Preferably, described electric machine control system also comprises user's display unit, and this user's display unit comprises the multiple LED light-emitting diodes being connected to described control circuit module.
The invention also discloses a kind of motor control method, comprise the following steps: the closed locking switch being connected to control circuit module; After first scheduled time of closed described locking switch, closed main switch; Be connected to motor soft start within second scheduled time of described control circuit module; And described motor enters predetermined operating mode.
Preferably, above-mentioned main switch comprises the sub-switch of multiple mutual parallel connection; The step of described closed main switch also comprises any one in closed described multiple sub-switch to realize the closed of described main switch.
The invention also discloses a kind of motor control method, comprise the following steps: make machine operation in battery saving mode; The operating current of monitoring motor; When this operating current exceedes the scheduled current upper limit time, motor is made to enter full speed operation state; Wherein this motor rotating speed and efficiency under full speed operation state is greater than this motor rotating speed in a power-save mode and efficiency respectively.
The invention also discloses a kind of motor control method, comprise the following steps: make machine operation in full speed operation state; The operating current of monitoring motor; When this operating current is lower than scheduled current lower limit time, motor is made to enter battery saving mode; Wherein this motor rotating speed and efficiency under full speed operation state is greater than this motor rotating speed in a power-save mode and efficiency respectively.
Accompanying drawing explanation
Can do further to understand to performance of the present invention and advantage with reference to the remaining part of this specification and accompanying drawing; In these accompanying drawings, the label of same assembly is identical.In some cases, son mark is placed in after certain label and hyphen to represent one of them of many similar component.When mentioning certain label but do not write some existing son marks especially exactly, just refer to all these similar assemblies.
Fig. 1 discloses the circuit structure diagram of electric machine control system according to an embodiment of the invention;
Fig. 2 discloses the flow chart of electric machine control system starter motor according to an embodiment of the invention;
Fig. 3 discloses the flow chart of electric machine control system disable motor according to an embodiment of the invention; And
Fig. 4 discloses the flow chart that electric machine control system according to an embodiment of the invention changes electrical machine working mode.
Embodiment
Embodiments of the invention are specifically described to the structure of electric machine control system and method that are used for electric tool.Can other different benefit of providing of apparent each embodiment of the present invention and advantage from following describing.
Referring now to Fig. 1, first embodiment of the present invention is the electric machine control system for grass mower, comprises power supply 20, is connected to the control circuit module 24 of power supply 20 and is connected to the motor 28 of control circuit module 24.These parts are preferably arranged in the enclosure interior of electric tool, thus avoid external environment affect and protected.Motor 28 is brshless DC motor alternatively.Control circuit module 24 comprises microcontroller alternatively, the (not shown) such as the memory be attached thereto.On the other hand, it is comparatively far away that this electric machine control system also comprises physically standoff distance, but a series of user's input-output apparatus be still electrically connected with control circuit module 24.This user's input-output apparatus comprises main switch 30, locking switch 29 and user's display unit 32.Main switch comprises the sub-switch of multiple mutual parallel connection further.User's display unit 32 comprises further (not shown herein) multiple LED light-emitting diode and display switch.
In the electric machine control system shown in Fig. 1, power supply 20 is preferably rechargeable battery, particularly the lithium battery of 36V.This battery both can be fixedly mounted on electric tool, also can be arranged on electric tool removedly.In the latter case, this battery can take out and be positioned in special charger and charge, and then puts into electric tool and use.Or electric tool can be built-in with charging device, thus battery also can be charged when being placed in electric tool.
In addition, electric machine control system also comprises the motor detection apparatus (not shown) being connected to motor.Real-time parameter when motor detection apparatus is connected to control circuit module 24 to be run by motor such as rotating speed, electric current etc. feed back to control circuit module 24.Workflow part below specifically describes by this.
Alternatively, electric machine control system comprises key system 22, to ensure that the user's (namely having the user of key) only obtained the authorization can operate this electric tool.Or this key system 22 also can ensure to only have experienced, to know this operating electric tool method user can use this electric tool, instead of anyone can both use.Do not inserting effective key in key system 22, power supply 20 cannot with other element electrical communication in electric machine control system, and therefore whole system is in off-position.
The working method being used for the electric machine control system of electric tool according to first embodiment of the invention will be introduced below.
First see Fig. 2, carry out in the process of work in startup grass mower, first step 100 switches on power, and namely powers up electric machine control system.This step, alternatively without the need to user operation, therefore has electric energy to be supplied to electric machine control system (although motor can't be powered between down period) because battery is positioned at grass mower inside all the time.Next, in step 102, user pins locking switch 29 (here also referred to as K switch 5) and kept for one first scheduled time do not let go.This first scheduled time is 0.1 second in a preferred embodiment.If control circuit module 24 can't detect user and presses locking switch 29, or user keeps the time of pressing locking switch 29 too short, and so motor start-up procedure can not continue, but gets back to initial power-up state 100.If control circuit module 24 detects that user pins locking switch 29 and keeps above-mentioned first scheduled time not let go, then proceed to next step 104.At step 104, control circuit module 24 detects user and whether presses any one sub-switch in main switch 30.Sub-switch in FIG always has 4, distinguishes called after K1, K2, K3, K4 here.These four sub-K switch 1, K2, K3, K4 are in parallel as shown in Figure 1, and therefore wherein any one sub-switch closes, and whole main switch 30 is also just in closure state.If control circuit module 24 detects that user presses any one sub-K switch 1, K2, K3 or K4 at step 104, so then motor 28 started soft start and enter normal mode of operation within second scheduled time in step 106.This second scheduled time is in 1-2 second, preferably 1.5 seconds.Alternatively, the mode of operation that first motor 28 enters after soft start is battery saving mode.If control circuit module 24 can't detect user and presses any one sub-K switch 1, K2, K3 or K4 at step 104, so motor start-up procedure can not continue, but gets back to initial power-up state 100.
With said process similarly, if in grass mower operating condition user wish shut down, so user can not use locking switch 29, but need use main switch 30.In the flow process shown in Fig. 3, time specifically in grass mower course of normal operation 108, if user has only decontroled the locking switch 29 pressed, motor 28 still normal work is unaffected.Only have in step 112 when control circuit module 24 detects the sub-K switch 1-K4 that user disconnects in whole main switches 30, motor 28 just can decommission.These four sub-K switch 1, K2, K3, K4 are in parallel as shown in Figure 1, if therefore only have one of them sub-switch to disconnect, whole main switch 30 is still just in closure state.Only have when all sub-switches all disconnect, whole main switch 30 just can be in off-state.Next, motor is also the soft stop process of cutting out gradually in the stopped process not being 114, and it continues 3 seconds.After 3 seconds, motor 28 stops operating completely.Therefore, grass mower gets back to holding state in step 116.
Next, grass mower mode of operation in normal operation will be introduced.The object of saving electric energy is reached in order to the motor realized in electric tool reduces electric power supply under no-load condition, control circuit module 24 detects the load parameter of motor 28 by detecting above-mentioned motor detection apparatus, thus controls machine operation in different mode of operations.Such load parameter can be the actual speed of motor or the operating current etc. of motor.Such as, control circuit module 24 detects the electric current of motor 28 in the above-described embodiment, motor is switched to different rotating speed gears by judging this detection current values.
See Fig. 4, motor 28 described above enters original operating state 200 in startup completes, and is preferably battery saving mode as mentioned above.Now grass mower rotating speed when blade is not mowed is about 2800rpm.In this battery saving mode, the operating current of motor 28 is less than 6.5A, and the power of motor 28 minimum only have its flat-out about 60%.But, if control circuit module 24 detects that the electric current of motor changes in step 204 (it is a process continuing to carry out), such as cause motor working current to rise (preferably rising to 8A here) because blade cuts a large amount of blade of grass (having comparatively heavy load), so in step 206, control circuit module 24 will make motor 28 carry out full speed operation state.Now motor 28 rotating speed is promoted to 3100rpm, and motor working current initiatively will be increased to 12 ~ 20A, and the efficiency of motor 28 now at least reaches 82%.
Carry out in full speed operation state at motor 28, if control circuit module 24 detects that the electric current of motor changes in step 208 (it is similarly a process continuing to carry out), such as cause motor working current to decline (being preferably lower than 8A) here because blade does not touch blade of grass again or seldom measure blade of grass (non-loaded or very little load), so workflow will get back to step 202, and wherein control circuit module 24 will make motor 28 get back to power saving molding.Notice that two kinds of above-mentioned electric machine operation states can keep mutual switching in the whole grass mower course of work always, thus reach the effect of saving electric energy, namely motor only have comparatively heavy load time just can full speed running, use more electricity, and do not work or low loaded work piece time can with reduce rotating speed run, reach the object of power saving.
In the other side of the electric machine control system for grass mower of Fig. 1, the multiple LED light-emitting diodes in above-mentioned user's display unit 32 may be used for showing dump energy, and whether display switch may be used for control LED light-emitting diode and enable.Such as, in the grass mower of above-mentioned use 36V battery, control circuit module 24 can also monitor the dump energy of battery 20.When the voltage of battery is greater than 39.7V, 4 LED are entirely bright, represent that battery is in the state of full electricity.Correspondingly, when the voltage of battery is greater than 37.7V but is less than 39.7V, only have 3 LED bright, indicate the electricity of 3/4.When the voltage of battery is greater than 36.0V but is less than 37.7V, only have 2 LED bright, indicate the electricity of 1/2.When the voltage of battery is greater than 31.9V but is less than 36.0V, only have 1 LED bright, represent the electricity being only left to have 1/4.When the voltage of battery is less than 31.9V, 4 LED go out entirely, represent that battery does not have electricity completely.
Therefore, after describing several embodiment, those skilled in the art will recognize that different changes, other structure, equivalent, can be used without and can deviate from essence of the present invention.Accordingly, above description should not be regarded as the restriction to the determined scope of the invention of such as following claim.
Although the electric tool described in above-mentioned specific embodiment is grass mower, but those skilled in the art can also be used in the electric tool of other type by being well understood to above-mentioned motor control method and system, such as but not limited to grass-mowing machine, electric drill, electric saw, electric hammer, floor cleaning machine, dust catcher, etc., as long as this electric tool is the operation under using motor to carry out having loading condition.
Scheduled time occurrences different in soft starter for motor, soft acceleration, shutdown brake is refer in the above embodiments.It is pointed out that the illustrative example that these concrete numerical value just provides according to actual service condition.Those skilled in the art can adopt different time value settings according to different power tool type and required protected effect etc. completely.
According to actual needs, the electric machine control system in the present invention can also have overcurrent protective device.In one example in which, when the electric current of motor is more than 35A, then the duration is the overcurrent protection startup of 0.5 second, roof-cut resistence, and carries out motor brake.The motor stopping when motor generation protection act.If now want to work on, then need to disconnect all switches, then reopen them, as normal setting up procedure.
According to actual needs, the electric machine control system in the present invention can also have communication module group.This communication module group is used for communicating with external device (ED), sends the operating state that electric tool comprises motor, and the order received from external device (ED) controls electric tool running.This communication module group is preferably just in state of activation after whole electric machine control system energising, can carry out communication, and regardless of the whether actual entry into service of motor.In like manner, even if this communication module group also can not be closed after motor stalling at once.
Claims (10)
1., for an electric machine control system for electric tool, comprising:
Motor;
Control circuit module, is connected to this motor;
Electrical energy devices, this electrical energy devices is connected to control circuit module and provides power supply for described electric machine control system;
Be connected to the motor detection apparatus of control circuit module, this motor detection apparatus is for detecting the load parameter of described motor.
2. electric machine control system as claimed in claim 1, wherein said motor is brshless DC motor.
3. electric machine control system as claimed in claim 1, also comprise the communication module group being connected to control circuit module, this communication module group is suitable for carrying out communication with external device.
4. electric machine control system as claimed in claim 1, wherein said electrical energy devices is lithium battery.
5. electric machine control system as claimed in claim 1, also comprise user's display unit, this user's display unit comprises the multiple LED light-emitting diodes being connected to described control circuit module.
6., for an electric machine control system for electric tool, comprising:
Motor;
Control circuit module, is connected to this motor;
Electrical energy devices, this electrical energy devices is connected to control circuit module and provides power supply for described electric machine control system;
Be connected to the locking switch of control circuit module; And
Be connected to the main switch of control circuit module.
7. electric machine control system as claimed in claim 6, wherein said main switch comprises the sub-switch of multiple mutual parallel connection.
8. electric machine control system as claimed in claim 6, wherein said motor is brshless DC motor.
9. electric machine control system as claimed in claim 6, also comprise the communication module group being connected to control circuit module, this communication module group is suitable for carrying out communication with external device.
10. electric machine control system as claimed in claim 6, also comprise user's display unit, this user's display unit comprises the multiple LED light-emitting diodes being connected to described control circuit module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410328401.XA CN104579054A (en) | 2013-10-24 | 2014-07-10 | Motor control system for electric tool |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320660456 | 2013-10-24 | ||
| CN201410328401.XA CN104579054A (en) | 2013-10-24 | 2014-07-10 | Motor control system for electric tool |
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| Publication Number | Publication Date |
|---|---|
| CN104579054A true CN104579054A (en) | 2015-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410328401.XA Pending CN104579054A (en) | 2013-10-24 | 2014-07-10 | Motor control system for electric tool |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080271904A1 (en) * | 2007-05-03 | 2008-11-06 | Mobiletron Electronics Co., Ltd. | Power hand tool |
| CN201211689Y (en) * | 2005-07-11 | 2009-03-25 | 布莱克和戴克公司 | Soft startup of electric tool motor |
| CN201493816U (en) * | 2009-07-13 | 2010-06-02 | 南京德朔实业有限公司 | Electric tool |
| CN102639301A (en) * | 2009-07-29 | 2012-08-15 | 日立工机株式会社 | Impact tool |
| CN102712083A (en) * | 2009-12-28 | 2012-10-03 | 株式会社牧田 | Motorized tool |
| CN102785232A (en) * | 2011-05-19 | 2012-11-21 | 日立工机株式会社 | Electric tool and communication plug for electric tool |
| CN102884911A (en) * | 2011-07-18 | 2013-01-23 | 上海热流环境科技有限公司 | Energy-saving method of mowing robot |
-
2014
- 2014-07-10 CN CN201410328401.XA patent/CN104579054A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201211689Y (en) * | 2005-07-11 | 2009-03-25 | 布莱克和戴克公司 | Soft startup of electric tool motor |
| US20080271904A1 (en) * | 2007-05-03 | 2008-11-06 | Mobiletron Electronics Co., Ltd. | Power hand tool |
| CN201493816U (en) * | 2009-07-13 | 2010-06-02 | 南京德朔实业有限公司 | Electric tool |
| CN102639301A (en) * | 2009-07-29 | 2012-08-15 | 日立工机株式会社 | Impact tool |
| CN102712083A (en) * | 2009-12-28 | 2012-10-03 | 株式会社牧田 | Motorized tool |
| CN102785232A (en) * | 2011-05-19 | 2012-11-21 | 日立工机株式会社 | Electric tool and communication plug for electric tool |
| CN102884911A (en) * | 2011-07-18 | 2013-01-23 | 上海热流环境科技有限公司 | Energy-saving method of mowing robot |
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Application publication date: 20150429 |
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