CN100537151C - Rotary tool driven by brushless motor - Google Patents
Rotary tool driven by brushless motor Download PDFInfo
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- CN100537151C CN100537151C CNB2005800248932A CN200580024893A CN100537151C CN 100537151 C CN100537151 C CN 100537151C CN B2005800248932 A CNB2005800248932 A CN B2005800248932A CN 200580024893 A CN200580024893 A CN 200580024893A CN 100537151 C CN100537151 C CN 100537151C
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Abstract
A rotary tool driven by a brushless motor, which can always appropriately and efficiently perform constant torque tightening work of screws, in which downsizing of the entire device and improvement of torque control accuracy are easily achieved, and conventional problems such as sparks occurring at switch contacts, wear, and negative effects to peripheral electronic apparatuses, electronic circuits, etc. are removed to reduce the sizes of and extend life of constituting components. A lever operation mechanism (20) as a drive switch or first Hall elements (31a, 31b) for detecting each operation of a push scan mechanism (18) and a second Hall element (32) for detecting clutch actuation are installed. Control means (50) is constructed such that a DC brushless motor (12) is rotatingly driven based on an operation signal by the first Hall elements (31a, 31b) and the drive is stopped based on an actuation signal of the second Hall element (32).
Description
Technical field
The present invention relates to use 3 phase DC Brushless Motor as the electronic rotary tool driven by brushless motor that revolves the drive motor of electric rotating tools such as tool; Relate in particular in order to carry out job content according to rotary tool driven by brushless motor, drive the selectivity operation of control with desirable bulldozing operation mode or lever operated mode, and, above-mentioned brushless motor when working as the load torque that has acted on the above-mentioned throw more than the predefined predetermined value stop control, mechanism as the clutch action that detects the torque setting clutch mechanism, use Hall element respectively as Magnetic Sensor, by making the controlling organization small compactization of the driving control of carrying out above-mentioned brushless motor like this, such control module all can be installed and be configured in the grip part housing of throw, and reveal by complete oncontacting and to realize the long-life, non-maintaining, can be suitably and carry out bolt etc. efficiently decide the moment of torsion tightening operation, and can easily improve the rotary tool driven by brushless motor of the control accuracy of moment of torsion.
Background technology
In the past, the applicant once proposed to possess the bolt device for screwing up of automatic energising shearing device, described automatic energising shearing device can electronicly revolve when flowing through the overload electric current that causes because of external moment of torsion in the tool, electrically detect this situation and stop to switch on to motor, make the armature short circuit of motor apply electrical control simultaneously, make this motor moment stop the rotation (with reference to patent documentation 1) to motor.Promptly, the bolt device for screwing up that this patent documentation 1 is put down in writing is for to be provided with on-off circuit electronic the revolving that has by the Motor Drive drive shaft rotating in the tool, when the load current that flows through when above-mentioned Motor Drive changes to overload electric current more than the predetermined value, detect this situation and stop the supply of motor drive current, then through providing of motor drive current was provided after the regular hour; And in the motor armature circuit, switching mechanism is set, when said switching circuit stops the action of supply of motor drive current, make above-mentioned motor armature short circuit, by applying electric braking to motor like this, the device that motor can be stopped the rotation moment.
And, generally adopted the DC motor as the electronic drive motor that revolves tool in the past.Advocate now and adopt that noise is revealed, prevented to produce to oncontacting, the moment of torsion large volume is little, rotary speed is high and characteristic good such as the life-span is long, the brushless motor with advantage such as non-maintaining is as the DC motor, and practicability.
, above-mentioned brushless motor---for example 3 phase DC Brushless Motor situation with the DC motor of prior art when driving control is different, needs the drive circuit of generation rotating excitation field.As such drive circuit can by the magnetic pole that detects Magnmet rotor with respect to the Magnetic Sensor (generally using Hall element) of the position of Magnmet rotor, corresponding with the position of above-mentioned rotor magnetic pole by excitation with the drive coil (3 phase coil) of the revolving force that applies certain orientation and application-specific integrated circuit circuit (translation circuit that the 3 phase full-wave bridge structures constitute) formation that drives these Magnetic Sensors of control and drive coil.
From this point of view, as the electric rotating tool that can adopt above-mentioned brushless motor, the applicant proposed to select optionally to drive with desirable bulldozing operation mode or lever operated mode according to job content the driving switch mode (with reference to patent documentation 2) of the electric rotating tool of control.
Promptly, the structure of the driving switch mode of the electric rotating tool that this patent documentation 2 is put down in writing is: be provided with in (1): motor, be combined in the first-class throw of screwdriver of operation such as carry out that bolt is tightened on the output shaft of this motor, driving above-mentioned motor makes throw begin the driving switch of above-mentioned operation, the torque detecting unit of the load torque that detection produces in throw along with the above-mentioned end of job, and in the electric rotating tool of the torque setting auto-stop mechanism that stops of the driving that when above-mentioned load torque reaches predefined torque value, makes throw, constitute (2) respectively and manipulating objects such as throw and bolt are connected and push and make its generation displacement carry out the driving switch of the bulldozing operation mode of ON Action magnet and Magnetic Sensor are combined, (3) switch knob that pushes on the handle that is arranged on electric rotating tool makes it produce the driving switch that the lever operated mode of ON Action is carried out in displacement, (4) above-mentioned Magnetic Sensor is connected with the power-on circuit of motor respectively, select above-mentioned any one mode of operation, utilize the magnetic strength of the Magnetic Sensor of the mode of operation of choosing to know that action makes the power-on circuit ON Action begin drive motor.
Therefore, if adopt the driving switch mode of the electric rotating tool of this structure, when using brushless motor as motor, can be in the Drive and Control Circuit of motor be held the handle housing that is configured to electric rotating tool compactly with above-mentioned driving switch, utilize complete oncontacting to reveal and realize the long-life and non-maintaining, have advantages such as to make its simple to operateization.
And, the applicant once proposed always suitably and expeditiously to carry out bolt etc. and decided the moment of torsion tightening operation, and can easily reach make that whole device is small-sized, the scheme (with reference to patent documentation 3) of the moment of torsion control mode of the electric rotating tool of the control accuracy of densification and raising moment of torsion.
Promptly, the mode of the moment of torsion control mode of the electric rotating tool that this patent documentation 3 is put down in writing for setting like this: the handle that is built-in with motor is set in (1), to be attached to as the driven shaft of operation axle on the output shaft of above-mentioned motor by reducing gear, setting possesses when having acted on the load torque more than the predetermined value on the above-mentioned driven shaft, cut off the clutch mechanism of above-mentioned output shaft and the cam holding section of moving of driven shaft with engaging, the torque setting mechanism that structure can regulate it for the operating point with above-mentioned clutch mechanism as the torque setting value is set, and be provided with the clutch action that detects above-mentioned clutch mechanism, carry out simultaneously in the electric rotating tool of the moment of torsion testing agency that the driving of above-mentioned motor stops to control, (2) the cam engaging of above-mentioned moment of torsion testing agency in the cam holding section of above-mentioned clutch mechanism is disengaged fully, under the state that clutch action finishes, the driving of carrying out above-mentioned motor when carrying out this detection action stops control.
Therefore, if adopt the moment of torsion control mode of the electric rotating tool of this structure, above-mentioned moment of torsion testing agency and magnet and Magnetic Sensor is combined, under the state that the cam engaging is disengaged fully, detect action, by adopting such structure, can eliminate electric spark or the wearing and tearing that switch contact produces in the moment of torsion testing agency of use mechanical switch mechanism of prior art and give around electronic equipment or electronic circuit etc. bring the problem of harm, and can realize small-sized, the long lifetime of composed component, can make whole electric tool compactness.
Patent documentation 1: Japanese Patent Publication 57-43389 communique
Patent documentation 2: TOHKEMY 2002-254346 communique
Patent documentation 3: TOHKEMY 2002-321166 communique
But, in the electric rotating tool of the electric rotating tool of the driving switch mode that adopts above-mentioned patent documentation 2 to be proposed and the moment of torsion control mode that adopts above-mentioned patent documentation 3 to be proposed, reveal for complete oncontacting and to realize the long-life and non-maintaining, use brushless motor and control the switching mechanism of usefulness with the driving of combined this brushless motor of electronic switch conduct carrying out of magnet and Magnetic Sensor, by adopting such structure, can obtain to have the electric rotating tool of disclosed whole advantages in above-mentioned patent documentation 2 and the patent documentation 3.
Therefore, the present inventor carries out deep research and result of experiment repeatedly, constituted the rotary tool driven by brushless motor that possesses following unit: the DC Brushless Motor that drives the throw rotation, be combined in the reducing gear on the output shaft of this brushless motor, be arranged on the torque setting clutch mechanism of axle on the joint portion of above-mentioned reducing gear and throw, handle operation mechanism and the bulldozing operation mechanism that can optionally operate as the driving switch that drives the Drive and Control Circuit of controlling above-mentioned brushless motor, structure is the bulldozing operation by the lever operated or above-mentioned driving switch of above-mentioned driving switch, drive above-mentioned brushless motor rotation, the control module that the driving of above-mentioned brushless motor is stopped by the clutch action that detects above-mentioned clutch mechanism; Finished the rotary tool driven by brushless motor of following structure: be provided with respectively on as the handle operation mechanism of the driving switch of above-mentioned brushless motor or bulldozing operation mechanism be used to detect lever operated or bulldozing operation, Hall element as Magnetic Sensor, and in above-mentioned clutch mechanism, be provided with the Hall element that is used to detect clutch action, control the Drive and Control Circuit of above-mentioned brushless motor according to the operation signal driving of driving switch with the former Hall element, the rotation of driving brushless motor, the Drive and Control Circuit of controlling above-mentioned brushless motor according to the actuating signal of clutch mechanism with the latter's Hall element stops it, the driving of brushless motor is stopped.
Promptly, if adopt the rotary tool driven by brushless motor of said structure, not only can always suitably and expeditiously carry out bolt etc. and decide the moment of torsion tightening operation, and can easily reach make that whole device is small-sized, the control accuracy of densification and raising moment of torsion, and can eliminate electric spark or the wearing and tearing that the switch contact in the driving switch of use mechanical switch mechanism of prior art or the moment of torsion testing agency etc. produces and give around electronic equipment or electronic circuit etc. bring the problem of harm, can realize small-sized, the long lifetime of component parts.
And, above-mentioned rotary tool driven by brushless motor can constitute the Drive and Control Circuit of above-mentioned brushless motor in order to lower unit: the AC/DC converter unit that links to each other with the source power supply of the supply voltage that obtains the driving brushless motor, above-mentioned supply voltage is transformed into the translation circuit that constitutes by the semi-conductor electricity bridge construction of the driving voltage of brushless motor, suitable ON/OFF is controlled the semi-conductive drive circuit that is made of bridge structure of above-mentioned translation circuit, detection rotor is used for the control signal of switching the electric current that offers above-mentioned magnet exciting coil according to the detected position detection signal of above-mentioned position detecting circuit is exported to the control module of above-mentioned drive circuit with respect to the position detecting circuit of the position of the magnet exciting coil of brushless motor.
Wherein, when the Drive and Control Circuit of the actuating signal control brushless motor of the detected clutch mechanism of Hall element that is provided with in for example according to above-mentioned clutch mechanism stops it, cut off the driving electric power of brushless motor, and the semiconductor that is made of bridge structure of the translation circuit that is provided with in the Drive and Control Circuit of control operation brushless motor makes the field coil short circuit condition of brushless motor, carry out the braking of rotor, by such setting, the brake hard of the rotor of brushless motor can be carried out, the control accuracy of moment of torsion in the bolt tightening operation can be further improved.
And, to can be as the driving switch of the Drive and Control Circuit that drives the above-mentioned brushless motor of control and optionally the handle operation mechanism and the bulldozing operation mechanism of operation, end under the situation of its lever operated or bulldozing operation, also with the above-mentioned the same driving electric power that cuts off brushless motor, the semiconductor that constitutes by bridge structure of the translation circuit that is provided with in the Drive and Control Circuit of the brushless motor of control operation simultaneously make brushless motor field coil short circuit condition, carry out the braking of rotor.By adopting such structure, in the fastening of bolt or back out in the operation, when driving switch is ended, can prevent the drive unit drill free, can easily reach the security and the raising speed of operation.
As the representative scheme, the structure of rotary tool driven by brushless motor of the present invention can possess following unit: the DC Brushless Motor that drives the throw rotation, be combined in the reducing gear on the output shaft of this brushless motor, detect the load current detecting unit of the load current of above-mentioned brushless motor, handle operation mechanism and the bulldozing operation mechanism that can optionally operate as the driving switch that drives the Drive and Control Circuit of controlling above-mentioned brushless motor, structure is for driving above-mentioned brushless motor rotation by lever operated above-mentioned driving switch or the above-mentioned driving switch of bulldozing operation, when the detected load current of above-mentioned load current detecting unit surpasses predefined setting value, carry out the control module that the driving of above-mentioned brushless motor stops; Can adopt following structure: in as the handle operation mechanism of the driving switch of above-mentioned brushless motor or bulldozing operation mechanism, be provided for respectively detecting lever operated or bulldozing operation, as the Hall element of Magnetic Sensor, according to the operation signal of the detected driving switch of above-mentioned Hall element drive the above-mentioned brushless motor of control Drive and Control Circuit, drive the brushless motor rotation, when the detected load current of above-mentioned load current detecting unit surpasses setting value, stop to control above-mentioned brushless motor Drive and Control Circuit, brushless motor is driven stop.
Therefore, in the rotary tool driven by brushless motor of this structure also with above-mentioned the same, not only can always suitably and expeditiously carry out bolt etc. and decide the moment of torsion tightening operation, and can easily reach make that whole device is small-sized, the control accuracy of densification and raising moment of torsion, and can eliminate electric spark or the wearing and tearing that the switch contact in the driving switch of use mechanical switch mechanism of prior art or the moment of torsion testing agency etc. produces and give around electronic equipment or electronic circuit etc. bring the problem of harm, can realize small-sized, the long lifetime of composed component.
And, with above-mentioned the same, when when surpassing setting value, stopping to control the Drive and Control Circuit of brushless motor by the detected load current of load current detecting unit, cut off the driving electric power of brushless motor, the semiconductor that constitutes by bridge structure of the translation circuit that is provided with in the Drive and Control Circuit of the brushless motor of ON/OFF control operation simultaneously make brushless motor field coil short circuit condition, carry out the braking of rotor, can carry out the brake hard of the rotor of brushless motor, further improve the control accuracy of moment of torsion.
Summary of the invention
Therefore, purpose of the present invention be exactly to provide a kind of not only can always suitably and expeditiously carry out bolt etc. decide the moment of torsion tightening operation, and can easily reach make that whole device is small-sized, the control accuracy of densification and raising moment of torsion, and can eliminate electric spark or the wearing and tearing that the switch contact in the driving switch of use mechanical switch mechanism of prior art or the moment of torsion testing agency etc. produces and give around electronic equipment or electronic circuit etc. bring the problem of harm, can realize the rotary tool driven by brushless motor of small-sized, the long lifetime of component parts.
In order to achieve the above object, the rotary tool driven by brushless motor of the 1st scheme of the present invention possesses: the DC Brushless Motor that drives the throw rotation; Be arranged on the torque setting clutch mechanism on the axle joint portion of the output shaft of this brushless motor and throw; Drive the driving switch of the Drive and Control Circuit of the above-mentioned brushless motor of control; And, structure above-mentioned brushless motor rotation, carry out the control module that the driving of above-mentioned brushless motor stops by the clutch action that detects above-mentioned clutch mechanism for the operation by above-mentioned driving switch drives; It is characterized in that:
Be provided with to as the handle operation mechanism or the bulldozing operation mechanism of the driving switch of above-mentioned brushless motor, detect the 1st Hall element of lever operated or bulldozing operation; And the 2nd Hall element that above-mentioned clutch mechanism is detected clutch action is set;
And, also be provided with carry out above-mentioned brushless motor just/the counter-rotating handover operation just/counter-rotating handover operation mechanism, and be provided with just above-mentioned/counter-rotating handover operation mechanism just detected/the 3rd Hall element of counter-rotating handover operation;
Be provided with such control module, this control module drives the Drive and Control Circuit of the above-mentioned brushless motor of control according to the operation signal of the detected driving switch of above-mentioned the 1st Hall element, drive the brushless motor rotation, stop to control the Drive and Control Circuit of above-mentioned brushless motor according to the actuating signal of the detected clutch mechanism of above-mentioned the 2nd Hall element, brushless motor is driven stop;
Utilize above-mentioned control module to set like this: when according to the actuating signal of the detected clutch mechanism of above-mentioned the 2nd Hall element, when stopping to control the Drive and Control Circuit of brushless motor, cut off the driving electric power of brushless motor, and the semiconductor that constitutes by bridge structure of the translation circuit that is provided with in the Drive and Control Circuit of control operation brushless motor, make the field coil short circuit condition of brushless motor, carry out the braking of rotor;
When the bulldozing operation ended as the lever operated or bulldozing operation mechanism of the handle operation mechanism of the driving switch of above-mentioned brushless motor, set the control that stops of carrying out brushless motor like this: according to the operation abort signal of the detected driving switch of above-mentioned the 1st Hall element, the semiconductor that constitutes by bridge structure of the translation circuit that is provided with in the Drive and Control Circuit of the above-mentioned brushless motor of control operation, make the field coil short circuit condition of brushless motor, carry out the braking of rotor;
And then, according to above-mentioned the 3rd Hall element just detected/counter-rotating handover operation signal, make the brushless motor forward or reverse by above-mentioned control module.
The rotary tool driven by brushless motor of the 2nd scheme of the present invention possesses: the DC Brushless Motor that drives the throw rotation; Detect the load current detecting unit of the load current of this brushless motor; Drive the driving switch of the Drive and Control Circuit of the above-mentioned brushless motor of control; And structure is above-mentioned brushless motor rotation for the operation by above-mentioned driving switch drives, and carries out the control module that the driving of above-mentioned brushless motor stops when surpassing predefined setting value by the detected load current of above-mentioned load current detecting unit; It is characterized in that:
Be provided with the 1st Hall element that detects lever operated or bulldozing operation to as the handle operation mechanism or the bulldozing operation mechanism of the driving switch of above-mentioned brushless motor;
And, also be provided with carry out above-mentioned brushless motor just/the counter-rotating handover operation just/counter-rotating handover operation mechanism, and be provided with just above-mentioned/counter-rotating handover operation mechanism just detected/the 3rd Hall element of counter-rotating handover operation;
Be provided with control module, this control module drives the Drive and Control Circuit of the above-mentioned brushless motor of control according to the operation signal of the detected driving switch of above-mentioned the 1st Hall element, the rotation of driving brushless motor, when the detected load current of above-mentioned load current detecting unit surpasses setting value, stop to control the Drive and Control Circuit of above-mentioned brushless motor, brushless motor is driven stop;
Utilize above-mentioned control module to set like this: when the detected load current of above-mentioned load current detecting unit surpasses setting value, stop to control the Drive and Control Circuit of brushless motor, cut off the driving electric power of brushless motor this moment, and the semiconductor that constitutes by bridge structure of the translation circuit that is provided with in the Drive and Control Circuit of control operation brushless motor, make the field coil short circuit condition of brushless motor, carry out the braking of rotor; And,
When the lever operated or bulldozing operation ended as the handle operation mechanism of the driving switch of above-mentioned brushless motor or bulldozing operation mechanism, set the control that stops of brushless motor like this: according to the operation abort signal of the detected driving switch of above-mentioned the 1st Hall element, the semiconductor that constitutes by bridge structure of the translation circuit that is provided with in the Drive and Control Circuit of the above-mentioned brushless motor of control operation, make the field coil short circuit condition of brushless motor, carry out the braking of rotor;
And then, according to above-mentioned the 3rd Hall element just detected/counter-rotating handover operation signal, make the brushless motor forward or reverse by above-mentioned control module.
The effect of invention
If adopt the rotary tool driven by brushless motor of the solution of the present invention 1, the operation or the detection action oncontacting of driving switch and torque setting clutch mechanism are revealed, not only can always suitably and expeditiously carry out bolt etc. and decide the moment of torsion tightening operation, and can reach easily and make whole device small-sized, the control accuracy of densification and raising moment of torsion, and can eliminate electric spark or the wearing and tearing that the switch contact in the driving switch of use mechanical switch mechanism of prior art or the moment of torsion testing agency etc. produces and give around electronic equipment or electronic circuit etc. bring harm, can realize the small-sized of composed component, long lifetime.
If adopt the rotary tool driven by brushless motor of the solution of the present invention 2, reveal by the operation oncontacting that makes driving switch, and set the detection action of moment of torsion with the load current detecting unit, not only can always suitably and expeditiously carry out bolt etc. and decide the moment of torsion tightening operation, and can reach easily and make whole device small-sized, the control accuracy of densification and raising moment of torsion, and can eliminate electric spark or the wearing and tearing that the switch contact in the driving switch of use mechanical switch mechanism of prior art or the moment of torsion testing agency etc. produces and give around electronic equipment or electronic circuit etc. bring the drawback of harm, can realize the small-sized of composed component, long lifetime.
If adopt the rotary tool driven by brushless motor of the solution of the present invention 1 and 2, even be provided with can screw on bolt and back out bolt brushless motor just/situation of counter-rotating handover operation mechanism under, the operation oncontacting of/counter-rotating handover operation mechanism just above-mentioned by making is revealed, and can expect excellent results same as described above.
If adopt rotary tool driven by brushless motor of the present invention, can make the compact conformation of the Drive and Control Circuit of brushless motor, the inside of the as a whole handle portion housing that easily is assembled into rotary tool driven by brushless motor can be become with Hall element separately and integrated, whole rotary tool driven by brushless motor can be made at low cost.
If adopt rotary tool driven by brushless motor of the present invention, in the Drive and Control Circuit of the brushless motor of this structure, when tighting a bolt operation, the brake hard of carrying out rotor by the field coil short circuit condition that makes brushless motor, can easily improve the control accuracy of moment of torsion thus with the tight a bolt control that stops of brushless motor after finishing of predetermined bolt screw-down torque.
If adopt rotary tool driven by brushless motor of the present invention, even ending under lever operated or bulldozing operation the situation as the handle operation mechanism of the driving switch of brushless motor or bulldozing operation mechanism, by with above-mentioned brushless motor stop to control the same brake hard of carrying out rotor by the field coil short circuit condition that makes brushless motor, the abort state that keeps above-mentioned lever operated or bulldozing operation, and not only under the situation of bolt of screwing on, also can reach suitably under the situation of bolt and the control operation of rotary tool driven by brushless motor smoothly backing out.
Description of drawings
Fig. 1 is that expression is as the general configuration of the brushless motor driving screwdriver of an embodiment of rotary tool driven by brushless motor of the present invention and the key diagram of control system.
Fig. 2 is the control system figure of embodiment of the control module of the brushless motor in the rotary tool driven by brushless motor of the present invention.
Fig. 3 is the flow chart of the control action process of the brushless motor in the rotary tool driven by brushless motor of the present invention.
Fig. 4 is the electronic key diagram that revolve general configuration and the control system of tool of expression as other embodiment of rotary tool driven by brushless motor of the present invention.
The specific embodiment
Describe the embodiment of rotary tool driven by brushless motor of the present invention with reference to the accompanying drawings in detail.
Fig. 1 drives the general configuration of screwdriver and the key diagram of control system as the use driver bit of an embodiment of rotary tool driven by brushless motor of the present invention as the brushless motor of throw for expression.Promptly, the inner brushless motor that brushless motor 12 is installed of reference marks 10 expressions drives screwdriver among Fig. 1, this brushless motor drives screwdriver 10 and is provided with by suitable reducing gear and will be attached on the output shaft of above-mentioned brushless motor 12 in conjunction with the driven shaft that keeps driver bit 14, possesses when the load torque that acted on the above-mentioned driven shaft predefined predetermined value more than, the torque setting clutch mechanism 16 of the above-mentioned output shaft of cut-out and the cam holding section of moving of driven shaft with engaging.And, on the joint portion of the output shaft of above-mentioned brushless motor 12 and driven shaft, be provided with the bulldozing operation mechanism 18 that produces displacements, plays driving switch by along the above-mentioned driver bit 14 of axis direction bulldozing operation.And, drive at the brushless motor that is built-in with above-mentioned brushless motor 12 on the lateral surface of handle housing of screwdriver, not only be provided with the handle operation mechanism 20 of driving switch effect, and be provided with carry out above-mentioned brushless motor 12 just/the counter-rotating handover operation just/counter-rotating handover operation mechanism 22.
And, drive in the screwdriver 10 at the brushless motor of present embodiment, in handle operation mechanism 20 that the driving switch as above-mentioned brushless motor 12 is provided with and bulldozing operation mechanism 18, be provided with respectively as shown in Figure 1 with combined the 1st Hall element 31a, the 31b of the magnet that is fit to detect usefulness as Magnetic Sensor.And, on above-mentioned torque setting clutch mechanism 16, be provided with combined the 2nd Hall element 32 of the magnet that is fit to detect usefulness as Magnetic Sensor.And, in just above-mentioned/counter-rotating handover operation mechanism 22, be provided with combined the 3rd Hall element 33 of the magnet that is fit to detect usefulness as Magnetic Sensor.
At this moment, above-mentioned the 1st Hall element 31a, 31b can go up the Magnetic Sensor (33b, 31b) that is provided with as for example TOHKEMY 2002-254346 communique (above-mentioned patent documentation 2) disclosed driving switch (32,30), are arranged on the handle operation mechanism 20 and bulldozing operation mechanism 18 as driving switch.And above-mentioned the 2nd Hall element 32 also can be gone up the Magnetic Sensor (44) that is provided with as for example TOHKEMY 2002-321166 communique (above-mentioned patent documentation 3) disclosed moment of torsion testing agency (42), is arranged on the torque setting clutch mechanism 16.
On the other hand, Drive and Control Circuit 40 is disposed in connection on above-mentioned brushless motor 12.Yet the Drive and Control Circuit 40 of this brushless motor 12 is made of following as shown in Figure 2: be connected the AC/DC converter unit 42 on the source power supply P of the supply voltage that is used to obtain to drive brushless motor 12 usefulness; Above-mentioned supply voltage is transformed into the translation circuit 44 that constitutes by semiconductor 3 phase full-wave bridge structures of the driving voltage of brushless motor 12; Suitably ON/OFF is controlled the semi-conductive drive circuit 46 that is made of bridge structure of above-mentioned translation circuit 44; Detection rotor is with respect to the position detecting circuit 48 of the position of magnet exciting coil 12a, the 12b of brushless motor 12,12c; And, be used for exporting to the control module 50 of above-mentioned drive circuit 46 with switch control signal that the electric current that offers above-mentioned magnet exciting coil 12a, 12b, 12c uses according to above-mentioned position detecting circuit 48 detected position detection signals.
Brushless motor at the present embodiment of this structure drives in the screwdriver 10, by handle operation mechanism 20 or the bulldozing operation mechanism 18 of operation as driving switch, output inputs to control module 50 by the lever operated signal S31a or the bulldozing operation signal S31b of the mode of operation of the 1st Hall element 31a or the detected driving switch of 31b.Therefore, the drive circuit 46 that is provided with in the operation signal S31a of the driving switch that above-mentioned control module 50 bases are imported like this or the Drive and Control Circuit 40 that S31b exports to drive control signal S46a brushless motor 12 is controlled brushless motors 12 by translation circuit 44 drivings.In addition, in this case, output is by the position detection signal S48 of the position detecting circuit 48 detected rotors that are provided with in the Drive and Control Circuit 40 of brushless motor 12 with respect to the position of magnet exciting coil 12a, the 12b of brushless motor 12,12c, in the Input Control Element 50, simultaneously above-mentioned control module 50 obtains to be used to switch the control signal of electric current of the magnet exciting coil 12a, the 12b that offer brushless motor 12,12c as above-mentioned drive control signal S46a (seeing figures.1.and.2) by drive circuit 46 and translation circuit 44.By like this, brushless motor drives screwdriver 10 can carry out the needed operation that tights a bolt.
Then, drive screwdriver 10 by brushless motor and carry out the bolt tightening operation, when the needed torque value that tights a bolt of arrival, when torque setting clutch mechanism 16 carries out clutch action, output inputs to control module 50 by the clutch operating signal S32 of the 2nd Hall element 32 detected these operating states.Then, above-mentioned control module 50 is exported to stop control signal S46b the drive circuit 46 that is provided with in the Drive and Control Circuit 40 of brushless motor 12 according to the actuating signal S32 of this clutch mechanism 16 of input, stops to control brushless motor 12 (seeing figures.1.and.2) by translation circuit 44.By like this, brushless motor drives screwdriver 10 can finish needed bolt tightening operation.
In addition, in the present embodiment, under the situation of for example backing out bolt, need 12 rotations of reverse drive brushless motor.Can adopt such structure in this case: by operation just/counter-rotating handover operation mechanism 22, output by the 3rd Hall element 33 detected be rotated in the forward or the state of reverse rotation just/counter-rotating handover operation signal S33, be input in the control module 50.Then, above-mentioned control module 50 is exported to drive control signal S46a the drive circuit 46 that is provided with in the Drive and Control Circuit 40 of brushless motor 12, is driven control brushless motor 12 by translation circuit 44 and make its forward or reverse (seeing figures.1.and.2) according to just above-mentioned/counter-rotating handover operation signal S33.
And, in the present embodiment, stopping to control under the situation of brushless motor 12, can set like this: in the drive circuit 46 that is provided with in the Drive and Control Circuit 40 of actuating signal S32 with stop control signal S46b output brushless motor 12 of above-mentioned control module 50 according to the clutch mechanism 16 of input, cut off the driving electric power of brushless motor 12 this moment, simultaneously the semiconductor that is made of bridge structure of the translation circuit 44 that is provided with in the Drive and Control Circuit 40 of control operation brushless motor 12 makes the magnet exciting coil 12a of brushless motor 12,12b, the brake hard of rotor is carried out in the 12c short circuit.
Follow the brushless motor of the present embodiment of said structure to drive the driving control of the brushless motor 12 that carries out when screwdriver 10 carries out the bolt tightening operation below with reference to flowchart text shown in Figure 3 and the control procedure when stopping to control.
Along with the beginning of bolt tightening operation, at first just operating/22 decisions of counter-rotating handover operation mechanism are to drive control brushless motor 12 to make its positive rotation or despining (going on foot-1).This just/mode of operation of counter-rotating handover operation mechanism 22 detects by the 3rd Hall element 33, output obtain just/counter-rotating handover operation signal S33, in the Input Control Element 50.Above-mentioned then control module 50 is set the drive control signal S46a of the drive circuit 46 that is provided with in the Drive and Control Circuit 40 of exporting to brushless motor 12, makes brushless motor 12 just drive control with changeing or makes it reversally drive control.
Then, operation is as the handle operation mechanism 20 or the bulldozing operation mechanism 18 (step-2) of driving switch.At this moment, export the operation signal S31a of lever operated driving switch or the operation signal S31b of bulldozing operation driving switch, be input in the control module 50 by the 1st Hall element 31a or 31b.Then, above-mentioned control module 50 is exported to drive control signal S46a the drive circuit 46 that is provided with in the Drive and Control Circuit 40 of brushless motor 12, drives control brushless motor 12 (step-3) by translation circuit 44.Thus and thus, brushless motor driving screwdriver 10 carries out needed bolt tightening operation.
When the needed bolt tightening operation that reaches that above-mentioned brushless motor drives that screwdriver 10 carries out, torque setting clutch mechanism 16 carries out clutch action (step-4).At this moment, by the 2nd Hall element 32 output clutch actuating signal S32, be input in the control module 50.Then, above-mentioned control module 50 is exported to stop control signal S46b in the drive circuit 46 that is provided with in the Drive and Control Circuit 40 of brushless motor 12, makes it stop (step-5) by translation circuit 44 control brushless motors 12.So, can finish brushless motor and drive the needed bolt tightening operation that screwdriver 10 carries out.In addition, under the situation of proceeding the bolt tightening operation, carry out above-mentioned steps-2～step-5 ground repeatedly and set.
In addition, carry out above-mentioned brushless motor 12 stop to control the time (step-5), can so setting: the driving electric power that cuts off brushless motor 12 as above narration, simultaneously the semiconductor that is made of bridge structure of the translation circuit 44 that is provided with in the Drive and Control Circuit 40 of control operation brushless motor 12 carries out the brake hard of rotor with magnet exciting coil 12a, 12b, the 12c short circuit of brushless motor 12.
And, in the present embodiment, when in the above-mentioned handle operation mechanism 20 or the process of bulldozing operation mechanism 18 (step-2) as driving switch of operation, ends lever operated or during bulldozing operation (step-6), the same with above-mentioned steps-5 carry out brushless motor 12 stop to control (step-7).Promptly, set this moment like this: the driving electric power that cuts off brushless motor 12, simultaneously the semiconductor that is made of bridge structure of the translation circuit 44 that is provided with in the Drive and Control Circuit 40 of control operation brushless motor 12 carries out the brake hard of rotor with magnet exciting coil 12a, 12b, the 12c short circuit of brushless motor 12.
Fig. 4 drives the general configuration of screwdriver and the key diagram of control system for the brushless motor of other embodiment of expression rotary tool driven by brushless motor of the present invention.In addition, for convenience of explanation, the structure division for identical with above-mentioned embodiment shown in Figure 11 adds identical reference marks, and detailed explanation is omitted.That is, the brushless motor of present embodiment drives screwdriver 10 ' for having omitted the torque setting clutch mechanism 16 in the foregoing description, be provided with the device of load current detecting unit (not shown) in the Drive and Control Circuit 40 of brushless motor 12.Other the structure brushless motor driving screwdriver 10 with the foregoing description 1 basically is identical.
But, in the present embodiment, operation and the foregoing description identical (with reference to step-1～step-3 of Fig. 3) of driving switch when driving control brushless motor 12.So, when drive screwdriver 10 ' carry out the bolt tightening operation with brushless motor, when reaching needed bolt screw-down torque value, in the present embodiment by replacing the clutch action (with reference to the step-4 of Fig. 3) that above-mentioned torque setting clutch mechanism 16 carries out in the detected load current detection signal of the load current detecting unit (not shown) S52 Input Control Element 50.Therefore set like this: above-mentioned control module 50 compares the load current detection signal S52 and the predefined setting value of input, when surpassing setting value, stop control signal S46b is exported to the drive circuit 46 that is provided with in the Drive and Control Circuit 40 of brushless motor 12, make it stop (with reference to the step-5 of Fig. 3) by translation circuit 44 control brushless motors 12.By like this, brushless motor drives screwdriver 10 ' can finish needed bolt tightening operation.
And, present embodiment can equally with the foregoing description be done following setting: when carry out brushless motor 12 stop to control the time (with reference to the step-5 of Fig. 3), cut off the driving electric power of brushless motor 12, simultaneously the semiconductor that is made of bridge structure of the translation circuit 44 that is provided with in the Drive and Control Circuit 40 of control operation brushless motor 12 carries out the brake hard of rotor with magnet exciting coil 12a, 12b, the 12c short circuit of brushless motor 12.
And, present embodiment also can equally with the foregoing description be done following setting: when in the above-mentioned handle operation mechanism 20 or the process of bulldozing operation mechanism 18 (with reference to the step-2 of Fig. 3) as driving switch of operation, end lever operated or during bulldozing operation (with reference to the step-6 of Fig. 3), the same with above-mentioned steps-5 carry out brushless motor 12 stop control (with reference to the step-7 of Fig. 3).
The preferred embodiments of the present invention below have been described respectively, but the present invention is not limited to the brushless motor of the foregoing description and drives screwdriver, can be applied to drive respectively by brushless motor the various throws of control, in addition, in the scope that does not exceed spirit of the present invention, can carry out multiple design alteration.
Claims (2)
1. a rotary tool driven by brushless motor possesses: the DC Brushless Motor that drives the throw rotation; Be arranged on the torque setting clutch mechanism on the axle joint portion of the output shaft of this brushless motor and throw; Drive the driving switch of the Drive and Control Circuit of the above-mentioned brushless motor of control; And, structure above-mentioned brushless motor rotation, carry out the control module that the driving of above-mentioned brushless motor stops by the clutch action that detects above-mentioned clutch mechanism for the operation by above-mentioned driving switch drives; It is characterized in that:
Be provided with to as the handle operation mechanism or the bulldozing operation mechanism of the driving switch of above-mentioned brushless motor, detect the 1st Hall element of lever operated or bulldozing operation; And the 2nd Hall element that above-mentioned clutch mechanism is detected clutch action is set;
And, also be provided with carry out above-mentioned brushless motor just/the counter-rotating handover operation just/counter-rotating handover operation mechanism, and be provided with just above-mentioned/counter-rotating handover operation mechanism just detected/the 3rd Hall element of counter-rotating handover operation;
Be provided with such control module, this control module drives the Drive and Control Circuit of the above-mentioned brushless motor of control according to the operation signal of the detected driving switch of above-mentioned the 1st Hall element, drive the brushless motor rotation, stop to control the Drive and Control Circuit of above-mentioned brushless motor according to the actuating signal of the detected clutch mechanism of above-mentioned the 2nd Hall element, brushless motor is driven stop;
Utilize above-mentioned control module to set like this: when according to the actuating signal of the detected clutch mechanism of above-mentioned the 2nd Hall element, when stopping to control the Drive and Control Circuit of brushless motor, cut off the driving electric power of brushless motor, and the semiconductor that constitutes by bridge structure of the translation circuit that is provided with in the Drive and Control Circuit of control operation brushless motor, make the field coil short circuit condition of brushless motor, carry out the braking of rotor;
When the bulldozing operation ended as the lever operated or bulldozing operation mechanism of the handle operation mechanism of the driving switch of above-mentioned brushless motor, set the control that stops of carrying out brushless motor like this: according to the operation abort signal of the detected driving switch of above-mentioned the 1st Hall element, the semiconductor that constitutes by bridge structure of the translation circuit that is provided with in the Drive and Control Circuit of the above-mentioned brushless motor of control operation, make the field coil short circuit condition of brushless motor, carry out the braking of rotor;
And then, according to above-mentioned the 3rd Hall element just detected/counter-rotating handover operation signal, make the brushless motor forward or reverse by above-mentioned control module.
2. a rotary tool driven by brushless motor possesses: the DC Brushless Motor that drives the throw rotation; Detect the load current detecting unit of the load current of this brushless motor; Drive the driving switch of the Drive and Control Circuit of the above-mentioned brushless motor of control; And structure is above-mentioned brushless motor rotation for the operation by above-mentioned driving switch drives, and carries out the control module that the driving of above-mentioned brushless motor stops when surpassing predefined setting value by the detected load current of above-mentioned load current detecting unit; It is characterized in that:
Be provided with the 1st Hall element that detects lever operated or bulldozing operation to as the handle operation mechanism or the bulldozing operation mechanism of the driving switch of above-mentioned brushless motor;
And, also be provided with carry out above-mentioned brushless motor just/the counter-rotating handover operation just/counter-rotating handover operation mechanism, and be provided with just above-mentioned/counter-rotating handover operation mechanism just detected/the 3rd Hall element of counter-rotating handover operation;
Be provided with control module, this control module drives the Drive and Control Circuit of the above-mentioned brushless motor of control according to the operation signal of the detected driving switch of above-mentioned the 1st Hall element, the rotation of driving brushless motor, when the detected load current of above-mentioned load current detecting unit surpasses setting value, stop to control the Drive and Control Circuit of above-mentioned brushless motor, brushless motor is driven stop;
Utilize above-mentioned control module to set like this: when the detected load current of above-mentioned load current detecting unit surpasses setting value, stop to control the Drive and Control Circuit of brushless motor, cut off the driving electric power of brushless motor this moment, and the semiconductor that constitutes by bridge structure of the translation circuit that is provided with in the Drive and Control Circuit of control operation brushless motor, make the field coil short circuit condition of brushless motor, carry out the braking of rotor; And,
When the lever operated or bulldozing operation ended as the handle operation mechanism of the driving switch of above-mentioned brushless motor or bulldozing operation mechanism, set the control that stops of brushless motor like this: according to the operation abort signal of the detected driving switch of above-mentioned the 1st Hall element, the semiconductor that constitutes by bridge structure of the translation circuit that is provided with in the Drive and Control Circuit of the above-mentioned brushless motor of control operation, make the field coil short circuit condition of brushless motor, carry out the braking of rotor;
And then, according to above-mentioned the 3rd Hall element just detected/counter-rotating handover operation signal, make the brushless motor forward or reverse by above-mentioned control module.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004215372 | 2004-07-23 | ||
| JP215372/2004 | 2004-07-23 | ||
| JP254480/2004 | 2004-09-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1988984A CN1988984A (en) | 2007-06-27 |
| CN100537151C true CN100537151C (en) | 2009-09-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800248932A Active CN100537151C (en) | 2004-07-23 | 2005-06-29 | Rotary tool driven by brushless motor |
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| Country | Link |
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| CN (1) | CN100537151C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2543617C2 (en) * | 2009-03-03 | 2015-03-10 | Роберт Бош Гмбх | Electrodynamic brake for general-purpose electric motor |
| US11623335B2 (en) | 2017-11-15 | 2023-04-11 | Defond Components Limited | Control assembly for use in operation of an electric device |
| CN110125857B (en) * | 2019-06-18 | 2021-04-16 | 孟朝晖 | Torque corner multidimensional sensing control device and method for electric wrench |
| CN111571508B (en) * | 2020-05-26 | 2021-10-19 | 上海威若顿机械制造有限公司 | Brushless motor nut riveting tool with adjustable stroke and rivet pulling force |
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| US4231270A (en) * | 1977-07-07 | 1980-11-04 | Katsuyuki Totsu | Electrically driven fastening appliance |
| CN1271992A (en) * | 1999-04-27 | 2000-11-01 | 株式会社日立制作所 | D. C. brushless electric motor driving equipment and air conditioner using said equipment |
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| JP2004066413A (en) * | 2002-08-07 | 2004-03-04 | Nidec Shibaura Corp | Impact tightening power tool |
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|---|---|---|---|---|
| US4231270A (en) * | 1977-07-07 | 1980-11-04 | Katsuyuki Totsu | Electrically driven fastening appliance |
| CN1271992A (en) * | 1999-04-27 | 2000-11-01 | 株式会社日立制作所 | D. C. brushless electric motor driving equipment and air conditioner using said equipment |
| CN1494471A (en) * | 2001-02-28 | 2004-05-05 | ʤ | Electric rotational tool driving switch system |
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| CN1988984A (en) | 2007-06-27 |
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