CN110739890A - speed control method of electric tool and electric tool - Google Patents
speed control method of electric tool and electric tool Download PDFInfo
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- CN110739890A CN110739890A CN201910588530.5A CN201910588530A CN110739890A CN 110739890 A CN110739890 A CN 110739890A CN 201910588530 A CN201910588530 A CN 201910588530A CN 110739890 A CN110739890 A CN 110739890A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
- H02P7/29—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention relates to a speed control method of electric tools, which comprises the steps of detecting stroke parameters of a trigger switch and load parameters of the electric tool in real time, determining and calculating a duty ratio according to the stroke parameters, judging whether the load state is in a no-load gear or a load gear according to the load parameters, controlling the PWM duty ratio to be equal to the calculated duty ratio when the load gear is in the load gear, controlling the PWM duty ratio to be equal to the product of the calculated duty ratio and a no-load deceleration coefficient when the no-load gear is in the no-load gear, wherein the no-load deceleration coefficient is less than 100%, and controlling the speed of the electric tool by changing the voltage at two ends of a motor according to the controlled PWM duty ratio.
Description
Technical Field
The invention relates to the field of electric tools, in particular to electric tool speed control methods and an electric tool
Background
In the field of electric tools, an electric tool for manually regulating speed through a trigger switch is common, the speed regulation principle is that the force of a user for operating the trigger changes the stroke of the trigger switch, so that the PWM duty ratio of a power switch, which is a driving module in the tool, is changed, and the PWM duty ratio finally changes the voltage at two ends of a motor, so that manual speed regulation is realized.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides speed control methods and speed control devices of the electric tool, and the electric tool, wherein the speed control methods and the speed control devices can properly reduce the motor speed/impact force of the electric tool according to actual needs, improve experience feeling, improve single-pack cruising ability, save energy and adapt to manual speed regulation of an operator.
The technical scheme adopted by the invention for solving the defects of the prior art is as follows:
A speed control method for electric tool includes real-time detecting the stroke parameter of trigger switch and the load parameter of electric tool, determining the duty ratio according to the stroke parameter, judging whether the load state is in no-load gear or load gear according to the load parameter, controlling the PWM duty ratio to be equal to the calculated duty ratio when the load gear is in the load gear, controlling the PWM duty ratio to be equal to the product of the calculated duty ratio and the no-load deceleration coefficient when the load gear is in the no-load gear, wherein the no-load deceleration coefficient is less than 100%, and controlling the speed of electric tool by changing the voltage at two ends of motor according to the PWM duty ratio.
, determining the load state to be in a no-load gear or a load gear according to the load parameter, wherein the load parameter of the electric tool is the working current of the motor, and the determining the load state to be in the no-load gear or the load gear includes determining the load state to be in the load gear when the working current is equal to or greater than a th preset current value, determining the load state to be in the no-load gear when the working current is less than a second preset current value, and determining the th preset current value to be equal to or greater than the second preset current value.
, the step of determining the load state to be in the no-load gear or the load gear according to the load parameter includes that the load state is in the load gear when the working speed is less than or equal to the th preset speed, the load state is in the no-load gear when the working speed is greater than the second preset speed, and the th preset speed is less than or equal to the second preset speed.
, the load parameters include or more of the motor operating current, operating speed, torque, and temperature.
, the duty ratio of the control PWM varies with the stroke parameter of the trigger switch when the load state is in the load gear or the no-load gear.
Correspondingly, the invention also provides electric tools, which comprise a motor, a trigger switch, a load detection unit, a controller and a driving module, wherein the trigger switch is operated by a user to change the stroke of the trigger switch to adjust the rotating speed of the motor, the load detection unit is used for detecting load parameters, the controller is used for detecting the stroke of the trigger switch to obtain the stroke parameters, determining and calculating the duty ratio according to the stroke parameters, obtaining the load parameters and judging that the load state of the tool is in a no-load gear or a load gear according to the load parameters, controlling the PWM duty ratio to be equal to the calculated duty ratio when the tool is in the load gear, controlling the PWM duty ratio to be equal to the product of the calculated duty ratio and a no-load deceleration coefficient when the tool is in the no-load gear, the no-load deceleration coefficient is less than 100%, the controller outputs a control signal with the.
, the trigger switch comprises an on-off switch, the user operates the trigger switch to control the on-off of the on-off switch, the on-off switch is switched on to work the electric tool, and the on-off switch is switched off to stop the electric tool.
, the power tool further includes a memory unit storing the idle reduction factor.
, the load detection unit is a current detection unit, the load parameter is a working current of the motor, when the working current is equal to or greater than a th preset current value, the load state is in a load gear, when the working current is less than a second preset current value, the load state is in a no-load gear, and the th preset current value is equal to or greater than the second preset current value.
, the load detection unit is a rotation speed detection unit, the load parameter is the working rotation speed of the motor, when the working rotation speed is less than or equal to the th preset rotation speed, the load state is in the load gear, when the working current is greater than the second preset rotation speed, the load state is in the no-load gear, and the th preset rotation speed is less than or equal to the second preset rotation speed.
, the load parameters include or more of the motor operating current, operating speed, torque, and temperature.
, the duty ratio of the control PWM varies with the stroke parameter of the trigger switch when the load state is in the load gear or the no-load gear.
According to the electric tool speed control method and the electric tool provided by the invention, the whole-process user can be ensured to manually regulate the speed, a lower control PWM duty ratio is intelligently adopted when the tool is started in a start-up no-load starting state, and the control PWM duty ratio is intelligently reduced under the condition that the load is switched to the no-load state, so that no matter in the no-load state, the user keeps the trigger stroke amount at large stroke amounts in the start-up no-load state, or the user keeps the trigger stroke amount at large stroke amounts in the state of being moved away from a workpiece and switched to the no-load state, smaller power supply voltages are automatically obtained at the two ends of the motor, the tool is always operated at lower speed/weaker impact force in the no-load state, the strong vibration of the tool is reduced, the user experience is improved, the single-pack endurance time is prolonged, and meanwhile, the manual speed regulation.
Drawings
The above objects, technical solutions and advantages of the present invention can be achieved by the following drawings:
fig. 1 is a block diagram schematically showing the structure of an electric power tool according to th embodiment of the present invention.
FIG. 2 is a graph of stroke amount of the trigger versus output PWM duty cycle in direct proportion to an embodiment of the present invention.
FIG. 3 is a graph of trigger stroke versus output PWM duty cycle for an arc-shaped positive relationship of embodiment of the present invention.
FIG. 4 is a graph of trigger stroke versus output PWM duty cycle for a step forward relationship of embodiment of the present invention.
Fig. 5 is a graph of the amount of trigger travel versus output PWM duty cycle for a negative relationship of embodiment of the present invention.
Fig. 6 is a flowchart of a speed control method of an electric tool of a second embodiment of the present invention.
Fig. 7 is a block diagram schematically showing the configuration of a speed control device for an electric power tool according to a third embodiment of the present invention.
Fig. 8 is a block diagram schematically showing the structure of an electric power tool according to a fourth embodiment of the present invention.
Fig. 9 is a flowchart of a speed control method of an electric power tool according to a fifth embodiment of the present invention.
Fig. 10 is a flowchart of implementations of step S300 of the fifth embodiment of the present invention.
Fig. 11 is a flowchart of another implementation modes of step S300 of the fifth embodiment of the present invention.
Detailed Description
For purposes of making the present application, its objects, aspects and advantages more apparent, the present application is described in further detail with reference to the drawings and the examples.
th embodiment of the invention.
Referring to fig. 1, the electric power tool includes a housing, a trigger switch 11, a control circuit board 12, a motor 13 power transmission mechanism, a work member, and a battery pack 14. The motor 13, the power transmission mechanism and the control circuit board 12 are positioned in the shell, the battery pack 14 is detachably mounted on the shell as a power supply, and the workpiece is mounted at the front end of the shell. When a user operates the trigger switch 11, the battery pack 14 supplies power to the control circuit board 12 and the motor 13, the control circuit board 12 controls the rotation of the motor 13, the rotation of the motor 13 is transmitted as a driving force to a workpiece at the front end through the power transmission mechanism, and the workpiece generates rotation/impact and other motions, thereby realizing various forms of work such as drilling, hammering, grinding, cutting and the like.
In this embodiment, the trigger switch 11 is a switch for turning on/off a tool and adjusting speed by a user, and has an appearance of trigger structures, the interior of the trigger structure includes on-off switches and sliding rheostats, the on-off switches are turned on by slightly pressing the trigger and are turned off by loosening the trigger, the on-off switches are turned on/off to control whether the power supply of the battery pack to the tool or whether the tool works, the on-off switches are turned on to work the electric tool, and the electric tool is stopped by turning off the on-off switches, the force of pressing the trigger by the user changes the trigger stroke, namely, the displacement of the trigger in the pressing direction, so as to change the resistance value of the sliding rheostat and further change the voltage values at two ends of the sliding rheostat, the trigger switch includes signal output lines, and the voltage values indirectly reflecting the trigger stroke are.
In this embodiment, the control circuit board 12 is control modules 12' including a controller and a driving module, the battery pack includes positive and negative power supply lines connected to both ends of the motor to supply power to the motor, the driving module is disposed on the power supply lines of the battery pack, , when the motor is a brushed dc motor, the driving module is at least power switches, when the motor is a brushless dc motor, the driving module is 6 power switches, and the control terminal of the power switch receives control signals which are pulse signals (PWM signals) to control the on and off of the power switches.
In , the control module includes a load detection unit for detecting at least load parameters, and the controller judges whether the load condition is idle or load according to the load parameters, wherein the controller can calculate stroke parameters, namely stroke quantity, which reflects the operation quantity of the trigger switch by the user, namely the percentage of the stroke of the trigger switch to the total stroke of the trigger, according to the voltage value indirectly reflecting the stroke of the trigger switch obtained from the signal output line of the trigger switch, and then the controller calculates calculated duty ratios according to the stroke quantity, wherein the calculated duty ratios are the intermediate quantity of calculated processes and are not determined to be the duty ratio of the pulse signal finally output to the power switch.
, the method for obtaining control duty cycles less than the calculated duty cycle during no-load includes setting at least no-load speed reduction coefficients less than 100% by the controller, and controlling the PWM duty cycle to be equal to the product of the calculated duty cycle and the no-load speed reduction coefficient.
, the control module includes a memory unit, the memory unit stores the no-load deceleration system, and the controller calls the no-load deceleration coefficient to control the calculation of the PWM duty ratio when the no-load gear is in the no-load gear.
By the speed control method, the electric tool has two different manual speed regulation ranges, for example, when the idle speed reduction coefficient is 75%, the load gear and the trigger stroke amount change in the range of 0-100% to correspondingly realize that the control PWM duty ratio changes in the range of 0-100%, and when the idle gear is realized, the trigger stroke amount corresponds in the range of 0-100% to correspondingly realize that the control PWM duty ratio changes in the range of 0-75%, and the load state is under , the control PWM duty ratio always changes with the switch trigger stroke, the control PWM duty ratio and the stroke amount of the trigger switch always have a positive relation, under the condition that the user presses the trigger with more force and the external load is not changed, the rotating speed of the tool is larger, the manual speed regulation under the same load gear is realized, the step is carried out, the idle speed reduction coefficient is set, so that the stroke/stroke amount of the switch is the same, the control PWM duty ratio calculated by the gear is always smaller than that of the load gear, the control duty ratio is calculated by the idle speed reduction coefficient, the calculation result is a-a, the idle speed reduction coefficient is calculated by the idle speed reduction function of 1 a, the idle speed reduction coefficient is calculated by the idle speed reduction function, and the load ratio calculated by the load function (f) and the load ratio is calculated by the following steps, wherein the output of the load ratio is calculated by the method, the method is calculated by the following steps, the method, the:
load stage, y1 ═ f (a) ═ l
No-load gear, y2 ═ f (a) ═ b ═ l ═ b
For example, when the trigger switch stroke amount a is 50%, l ═ f (a) is a, the calculated duty ratio l is equal to 50%, then in the load stage, the control PWM duty ratio y1 is equal to 50%, and in the idle stage, the idle speed reduction coefficient is set to 75%, the control PWM duty ratio y2 is 37.5%, and y2 is smaller than y1., and in the same stroke amount, the idle-time controller outputs control duty ratios which are smaller than those in the load stage, so that in actual use, full-force driving can be obtained in the load stage, and in the idle stage, the start-up user keeps the idle stroke amount at large stroke amounts, or when the trigger is moved away from the workpiece, the user keeps the trigger stroke amount at large stroke amounts, and the two ends of the motor automatically obtain smaller voltages, so that the rotation speed of the power tool is increased, and the shock feeling of the user is increased.
In summary, the speed control method of the electric tool of the present invention is not only changed in the whole course according to the manual operation of the user, but also changed automatically according to the load condition of the electric tool, and is manual and automatic combined speed control methods, or multi-gear manual speed regulation methods for automatically switching gears.
Referring to fig. 2, a relationship diagram of the stroke amount of the trigger-output PWM duty ratio when b is 75% and l is f (a) is a, and the control PWM duty ratio is in direct proportion to the stroke amount of the trigger switch. When the load gear is in a load gear, the stroke amount of the trigger operated by a user is changed from 0% to 100%, the control PWM duty ratio of the corresponding controller is changed from 0% to 100%, when the no-load gear is in a load gear, the stroke amount of the trigger operated by the user is changed from 0% to 100%, the control PWM duty ratio of the corresponding controller is changed from 0% to 75%, and the duty ratio line of the no-load gear is always lower than that of the load gear.
It will be understood by those skilled in the art that the relationship between the control PWM duty cycle and the stroke/stroke amount of the trigger switch is not limited to the direct proportional relationship of the preferred embodiment described above, and is within the scope of the present invention as long as the positive relationship is satisfied. See, for example, the graph of stroke amount of the trigger versus output PWM duty cycle for the arc-shaped positive relationship shown in fig. 3, and the graph of stroke amount of the trigger versus output PWM duty cycle for the step-wise positive relationship shown in fig. 4.
It will be understood by those skilled in the art that the manual adjustment of the trigger switch in the same load position is not limited to the positive relationship between the control PWM duty cycle and the stroke/stroke of the trigger switch in the above embodiments, and is within the scope of the present invention as long as the conditions for the manual adjustment of the power tool by the user via the trigger switch are met.
Preferably, the load detection unit is current detection units, the load parameter is the working current of the motor, in the embodiments, the controller judges whether the load condition is the idle gear or the load gear according to the load parameter, when the working current is greater than or equal to the preset current value, the load condition is the idle gear, when the working current is less than or equal to the preset current value, the load condition is the idle gear, the embodiment adopts preset current values to judge the load condition, if the working current fluctuates around the preset current value in a short time, the load condition fluctuates unstably between the load gear and the idle gear, the rotating speed of the tool fluctuates back and forth, the user feels bad, the second embodiment is provided, different from the embodiment, the controller judges whether the load condition is the idle gear or the load gear according to the load parameter, the controller judges that the load condition is the idle gear when the working current is greater than or equal to the preset current value, when the working current is greater than or equal to the second preset current value, the idle working current is larger than the preset current value, the second preset current value is judged that the working current is larger than the idle gear, the working current value is larger, the idle gear is judged that the working current of the working tool is larger, the idle gear is larger, the working current of the working tool, the working current of the working tool is larger, the working current of the working wire is larger, the working current of the working wire is larger working wire, the working current of the working wire is larger working current of the working tool, the working wire is larger power of the working wire, the power of the power wire is judged that the power of the power cutting tool is larger power cutting tool, the power cutting tool is larger power cutting tool, the.
Preferably, the load detection units are rotation speed detection units, the load parameter is the working rotation speed of the motor, in the embodiment, the controller determines whether the load condition is the no-load gear or the load gear according to the load parameter by determining whether the load condition is the no-load gear or the load gear when the working rotation speed is less than or equal to the preset rotation speed, and the load condition is the no-load gear when the working rotation speed is greater than the preset rotation speed, similarly, a second embodiment is provided, which has two different preset rotation speeds from the embodiment, the controller determines whether the load condition is the no-load gear or the load gear according to the load parameter by determining whether the load condition is the no-load gear when the working rotation speed is less than or equal to the preset rotation speed, determining the load condition is the no-load gear when the working rotation speed is greater than the second preset rotation speed, determining the load condition by using two preset rotation speeds, determining that the working rotation speed is the load condition when the tool is determined to be in the load gear, even if the working rotation speed is greater than the second preset rotation speed, determining that the working rotation speed is greater than the working rotation speed, the working rotation speed is still greater, determining that the working current is still greater than the working speed of the no-load gear, and determining that the working speed of the working tool is equal to the no-load gear, and that the working speed of the hall sensor is greater, and the hall sensor is not able to detect that the working speed of the working speed.
Preferably, the load detection unit is a module combining the current detection unit and the rotation speed detection unit, the load parameter is a working current and a working rotation speed, and the control unit can determine whether the load state of the tool is in a load range or an idle range according to the working current and the working rotation speed according to some determination manner, for example, when the working current is greater than or equal to th preset current value and the working rotation speed is less than or equal to th preset rotation speed, the load state is in the load range, when the working current is less than a second preset current value and the working rotation speed is greater than a second preset rotation speed, the load state is in the idle range, the th preset current value is greater than or equal to a second preset current value, and the th preset rotation speed is less than or equal to a second preset rotation speed.
It is easily understood by those skilled in the art that the load detection unit is not limited to the current detection unit, the rotation speed detection unit or the combination module of the current detection unit and the rotation speed detection unit, but may also include various detection modules that can represent the load parameters such as torque, temperature, etc., and these load parameters or detection modules alone or in combination can constitute the load detection module to reflect the load status of the power tool, and all fall within the protection scope of the present invention.
It is easily understood by those skilled in the art that the no-load deceleration factor b is not limited to be less than 100% as described above, but may be greater than 1, but at no-load, the control PWM duty ratio will become equal to the quotient of the calculated duty ratio divided by the no-load deceleration factor, and it is only necessary that y2 is less than y1, which falls within the protection scope of the present application.
Second embodiment of the invention
The second embodiment of the present application provides speed control methods of electric tools, which may include the following steps, as shown in fig. 6:
s101, detecting the stroke parameter of the trigger switch and the load parameter of the electric tool in real time, wherein the stroke parameter and the load parameter are as described in the embodiment and are not described herein.
S102, judging whether the load state is in the idle gear or the load gear according to the load parameter, wherein the judging process of the step is as described in embodiment and is not described herein.
S103, determining a calculation duty ratio according to the stroke parameters, controlling the PWM duty ratio to be equal to the calculation duty ratio when in a load gear, and controlling the PWM duty ratio to be smaller than the calculation duty ratio when in a no-load gear, wherein the step is related to a method for determining the control PWM duty ratio of the load/no-load gear, and is described in embodiment and is not repeated herein.
S104: and changing the voltage at two ends of the motor according to the control PWM duty ratio to control the speed of the electric tool.
Those skilled in the art will readily understand that the speed control method in this embodiment is implemented in the control module 102' in embodiment , and the specific implementation process is not described in detail in this embodiment .
The speed control method of the electric tool provided by the second embodiment of the invention has the advantages that the speed control is changed according to the manual operation of a user in the whole process, and also can be automatically changed according to the load condition of the electric tool, and the speed control method is manual and automatic combined speed control methods, or multi-gear manual speed regulation methods for automatically switching gears.
Preferably, in the step S103, when in the idle gear, the controlling the PWM duty ratio to be smaller than the calculated duty ratio may include the step of setting, by the controller, at least idle reduction coefficients smaller than 100%, and the controlling the PWM duty ratio to be equal to a product of the calculated duty ratio and the idle reduction coefficient, and the step of confirming the setting of the idle reduction coefficient and the idle control PWM duty ratio is, as described in embodiment , not described herein again.
Third embodiment
A third embodiment of the present invention provides electric tool speed control devices 20, as shown in fig. 7, comprising:
the measuring module 21 is used for detecting the stroke parameter of the trigger switch and the load parameter of the electric tool in real time;
the judging module 22 is used for judging whether the load state is in a no-load gear or a load gear according to the load parameters;
the calculating module 23 is configured to determine a calculated duty ratio according to the stroke parameter, and when the load is in the load gear, control the PWM duty ratio to be equal to the calculated duty ratio; when the gear is in a no-load gear, controlling the PWM duty ratio to be smaller than the calculated duty ratio;
and the execution module 24 is used for changing the voltage at two ends of the motor according to the control PWM duty ratio so as to control the speed of the electric tool.
It is easily understood by those skilled in the art that the speed control device 20 in this embodiment is located on the control circuit board 12 of embodiment , the measurement module 21, the determination module 22, the calculation module 23, and the execution module 24 in this embodiment all belong to the portion of the control module 12' in embodiment of the present invention, and the execution module 24 corresponds to the driving module of embodiment , and details are not repeated.
According to the speed control device of the electric tool provided by the third embodiment of the invention, the speed control not only changes in the whole process according to the manual operation of a user, but also automatically changes according to the load condition of the electric tool, and the speed control device adopts a speed control method combining manual operation and automatic operation, or adopts a speed control device of a multi-gear manual speed regulation method of gears automatically.
Fourth embodiment
The fourth embodiment of the invention provides electric tools, as shown in FIG. 8, comprising a motor, a trigger switch, the trigger switch controlling the speed of the motor, the electric tool further comprises a control module for controlling the speed of the motor according to the speed control method of the second embodiment.
It is easily understood by those skilled in the art that the motor, the trigger switch and the control module of the power tool in this embodiment correspond to the motor 13, the trigger switch 11 and the control module 12' in the embodiment , and detailed description is omitted.
According to the electric tool provided by the fourth embodiment of the invention, the speed control is changed according to the manual operation of the user in the whole process, and also automatically according to the load condition of the electric tool, so that the electric tool is the electric tool which applies manual and automatic combined speed control methods, or the electric tool which applies multi-gear manual speed regulation methods for automatically switching gears.
Fifth embodiment of the invention
As shown in fig. 9, a fifth embodiment of the present application provides speed control methods of a power tool, which may include the steps of:
s100: and detecting the stroke parameter of the trigger switch and the load parameter of the electric tool in real time.
The stroke parameter and the load parameter are as described in embodiment , and are not described herein.
S200: determining and calculating a duty ratio according to the stroke parameter;
s300: and judging whether the load state is in a no-load gear or a load gear according to the load parameters.
S410: when the load is in the load gear, controlling the PWM duty ratio to be equal to the calculated duty ratio;
s420: when the gear is in a no-load gear, controlling the PWM duty ratio to be equal to the product of the calculated duty ratio and a no-load deceleration coefficient, wherein the no-load deceleration coefficient is less than 100%;
s500: and changing the voltage at two ends of the motor according to the control PWM duty ratio to control the speed of the electric tool.
Those skilled in the art will readily understand that the order of steps S200 and S300 in this embodiment may be changed, and that S300 is before S200, the speed control method in this embodiment is implemented in the control module 102' in embodiment , and the specific implementation process is not described in detail in this embodiment .
According to the speed control method of the electric tool provided by the fifth embodiment of the invention, the speed control is changed according to the manual operation of a user in the whole process, and is also changed automatically according to the load condition of the electric tool, so that manual and automatic combined speed control methods or multi-gear manual speed regulation methods for automatically switching gears are adopted.
Referring to fig. 10, in embodiments, the load detection module is a current detection module, the load parameter of the power tool is a working current of the motor, and the step S300 of determining the load state in the idle gear or the load gear according to the load parameter includes:
s310, when the working current is greater than or equal to the th preset current value, the load state is a load gear;
at this time, jumping to step S410;
s320: when the working current is smaller than a second preset current value, the load state is a no-load gear;
at this time, jumping to step S420;
the specific principle of the th preset current value is greater than or equal to the second preset current value, which is the same as that of the th embodiment and is not repeated herein.
Referring to fig. 11, in embodiments, the load detection module is a rotation speed detection module, the load parameter of the power tool is a working rotation speed of the motor, and the step S300 of determining that the load state is in the idle gear or the load gear according to the load parameter includes:
s310', when the working rotating speed is less than or equal to th preset rotating speed, the load state is a load gear;
at this time, jumping to step S410;
s320': when the working rotating speed is greater than a second preset rotating speed, the load state is a no-load gear;
at this time, go to step 420;
the specific principle of the th preset rotation speed is less than or equal to the second preset rotation speed, which is the same as that of the embodiment and is not described herein again.
In embodiments, the load detection unit includes or more of the current detection unit, the rotation speed detection unit, the temperature monitoring unit, and the torque detection unit, the corresponding load parameters include or more of the operating current, the operating rotation speed, the torque, and the temperature of the motor, and the controller determines the load state of the tool in a load gear or a no-load gear according to a certain determination method for the plurality of load parameters, as described in embodiment , which is not described in detail further , when the load state is in the load gear or the no-load gear, and the load state is in gear, the PWM duty ratio is controlled to change along with the stroke parameter of the trigger switch.
The invention is not limited to the specific embodiment structures illustrated, and structures based on the inventive concept are all within the scope of the invention.
Claims (12)
1, A method for controlling speed of an electric tool, comprising:
detecting the stroke parameter of a trigger switch and the load parameter of the electric tool in real time;
determining and calculating a duty ratio according to the stroke parameter;
judging whether the load state is in a no-load gear or a load gear according to the load parameters;
when the load is in the load gear, controlling the PWM duty ratio to be equal to the calculated duty ratio;
when the gear is in a no-load gear, controlling the PWM duty ratio to be equal to the product of the calculated duty ratio and a no-load deceleration coefficient, wherein the no-load deceleration coefficient is less than 100%;
and changing the voltage at two ends of the motor according to the control PWM duty ratio to control the speed of the electric tool.
2. The method of claim 1, wherein the load parameter of the power tool is an operating current of the motor, and the step of determining whether the load state is in the idle gear or the load gear according to the load parameter comprises:
when the working current is greater than or equal to th preset current value, the load state is a load gear, and when the working current is less than a second preset current value, the load state is a no-load gear, and the th preset current value is greater than or equal to the second preset current value.
3. The method as claimed in claim 1, wherein the load parameter of the power tool is an operating speed of the motor, and the step of determining whether the load state is in the idle gear or the load gear according to the load parameter comprises:
when the working rotating speed is less than or equal to th preset rotating speed, the load state is a load gear, when the working rotating speed is greater than second preset rotating speed, the load state is a no-load gear, and the th preset rotating speed is less than or equal to the second preset rotating speed.
4. The method of claim 1, wherein the load parameters include or more of operating current, operating speed, torque, and temperature of the motor.
5. The speed control method of the power tool according to claim 1, wherein the control PWM duty ratio is varied according to a stroke parameter of the trigger switch when the load state is in the load range or the no-load range.
An power tool, comprising:
a motor;
the trigger switch is operated by a user to change the stroke of the trigger switch so as to adjust the rotating speed of the motor;
a load detection unit that detects a load parameter;
the controller is used for detecting the stroke of the trigger switch to obtain stroke parameters, determining and calculating a duty ratio according to the stroke parameters, obtaining load parameters and judging whether the load state of the tool is in a no-load gear or a load gear according to the load parameters, controlling the PWM duty ratio to be equal to the calculated duty ratio when the tool is in the load gear, controlling the PWM duty ratio to be equal to the product of the calculated duty ratio and a no-load deceleration coefficient when the tool is in the no-load gear, wherein the no-load deceleration coefficient is less than 100%, and the controller outputs a control signal with the controlled PWM duty ratio;
and a driving module which controls the voltage applied to both ends of the motor based on the control signal.
7. The power tool of claim 6, wherein the trigger switch includes an on/off switch, and wherein a user operates the trigger switch to turn the on/off switch on to operate the power tool and off to stop the power tool.
8. The power tool of claim 6, wherein the power tool further includes a memory unit storing the idle reduction factor.
9. The power tool of claim 6, wherein the load detecting unit is a current detecting unit, the load parameter is an operating current of the motor, the load state is in a load range when the operating current is equal to or greater than th preset current value, the load state is in a no-load range when the operating current is less than a second preset current value, and the th preset current value is equal to or greater than the second preset current value.
10. The power tool of claim 6, wherein the load detecting unit is a rotation speed detecting unit, the load parameter is an operating rotation speed of the motor, the load state is in a load gear when the operating rotation speed is equal to or less than th preset rotation speed, the load state is in a no-load gear when the operating current is greater than a second preset rotation speed, and the th preset rotation speed is equal to or less than the second preset rotation speed.
11. The power tool of claim 6, wherein the load parameters include or more of operating current, operating speed, torque, temperature of the motor.
12. The power tool of claim 6, wherein the control PWM duty cycle varies with a stroke parameter of the trigger switch when the load condition is in the load or no load gear.
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