CN108544416B - Brushless servo electric screwdriver - Google Patents
Brushless servo electric screwdriver Download PDFInfo
- Publication number
- CN108544416B CN108544416B CN201810759945.XA CN201810759945A CN108544416B CN 108544416 B CN108544416 B CN 108544416B CN 201810759945 A CN201810759945 A CN 201810759945A CN 108544416 B CN108544416 B CN 108544416B
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- China
- Prior art keywords
- electric screwdriver
- port
- resistance
- brushless servo
- electric
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 18
- 230000005611 electricity Effects 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention relates to a brushless servo electric screwdriver, which comprises an electric screwdriver and a brushless servo electric screwdriver controller, wherein the electric screwdriver is connected with the brushless servo electric screwdriver controller through wires, aviation plug connectors are arranged at two ends of each wire, the aviation plug connectors are respectively connected with the electric screwdriver and the brushless servo electric screwdriver controller, a platinum resistor element is arranged in the electric screwdriver, a torque compensation circuit is arranged in the brushless servo electric screwdriver controller, the platinum resistor element is electrically connected with the torque compensation circuit, and the working current of a motor is compensated through the temperature resistance characteristic of the platinum resistor element, so that the compensation of the working torque of the motor is realized.
Description
Technical Field
The invention relates to an electric screwdriver, in particular to a brushless servo electric screwdriver.
Background
The electric screwdriver is used for screwing and unscrewing an electric tool for screws, is mainly used on an assembly line, improves working efficiency, saves effort, is long in working time, in the prior art, a motor is in the working process, the temperature of a coil winding of an internal motor can rise gradually along with the time, the temperature of the winding rises faster when working current is larger, the temperature of the winding rises, the impedance is increased, the torque of the electric screwdriver can be reduced, and the current electric screwdriver is complicated in structure, low in precision and high in maintenance cost.
Disclosure of Invention
The invention provides a brushless servo electric screwdriver which aims at overcoming the defects in the prior art.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the utility model provides a brushless servo electric screwdriver, includes electric screwdriver and brushless servo electric screwdriver controller, electric wire connection between electric screwdriver and the brushless servo electric screwdriver controller, and the both ends of electric wire are the plug, and plug is pegged graft electric screwdriver and brushless servo electric screwdriver controller respectively, be equipped with platinum resistance element in the electric screwdriver, be equipped with torque compensation circuit in the brushless servo electric screwdriver, platinum resistance element and torque compensation circuit electric connection, torque compensation circuit includes amplifier, power, first resistance, second resistance, third resistance, thermistor, condenser, programming control unit and output, the amplifier is semiconductor component, and the amplifier is equipped with eight ports, and first port and fourth port electric connection, second port, thermistor, first resistance, power end establish ties electricity in proper order, and the third port is connected to between thermistor and the first resistance, and the fifth port and second resistance one end electric connection, the sixth port and third resistance one end electric connection, the second resistance other end electric connection constitutes between the seventh port and the third resistance, the same electricity connection point with the output unit, wherein, the amplifier is connected with the output to the fourth port, the same electricity connection point with the seventh electricity, the output unit is connected to the output to the fourth port.
Further, the programming control unit comprises an AD sampling circuit, and the programming control unit is electrically connected with the motor driver.
Further, the first port, the fourth port, the second port and the thermistor are respectively grounded.
Further, a reference potential is connected between the fifth port and the second resistor.
Further, a capacitor is connected between the eighth port and the power supply, and the capacitor is connected with electricity.
Further, the screwdriver comprises a shell, a motor and an output spindle which are connected are arranged in the shell, one end of the output spindle extends out of the shell and is connected with a screwdriver nozzle, and the platinum resistor element is arranged on the surface of the motor shell.
Compared with the prior art, the invention has the following implementation effects:
according to the invention, the current in the circuit is compensated through the temperature resistance characteristic of the platinum resistor element, so that the compensation of the working torque of the motor under constant voltage is realized, and the working stability of the motor is ensured.
Drawings
FIG. 1 is a diagram of the structure of the present invention;
fig. 2 is a sectional view of a structure of a brushless electric screwdriver according to the present invention.
FIG. 3 is a schematic diagram of a torque compensation circuit of a brushless electric screwdriver according to the present invention;
Detailed Description
The present invention will be described below with reference to specific examples.
As shown in fig. 1, fig. 2 and fig. 3, a brushless servo electric screwdriver comprises an electric screwdriver 100 and a brushless servo electric screwdriver controller 200, wherein the electric screwdriver 100 is connected with the brushless servo electric screwdriver controller 200 through wires, two ends of the wires are plug connectors, the plug connectors are respectively plugged into the electric screwdriver 100 and the brushless servo electric screwdriver controller 200, a platinum resistor element 101 is arranged in the electric screwdriver, the platinum resistor element 101 is a thermistor, a torque compensation circuit 201 is arranged in the brushless servo electric screwdriver controller 200, the platinum resistor element 101 is electrically connected with the torque compensation circuit 201, the torque compensation circuit 201 comprises an amplifier 202, a power supply 203, a first resistor 204, a second resistor 205, a third resistor 206, the platinum resistor element 101, a programming control unit 207 and an output end 208, the amplifier 202 is a semiconductor element, the amplifier 202 is provided with eight ports, the first port is electrically connected with a fourth port, the platinum resistor element 101, the first resistor 204 and the power supply 203 are sequentially electrically connected with the third port 205, the third port is electrically connected with the third port 206, the third port is electrically connected with the third port 206, and the output end is electrically connected with the third port. The programming control unit 207 includes an AD sampling circuit, and the programming control unit 207 is electrically coupled with a motor driver. The first port, the fourth port, the second port and the platinum resistor element 101 are grounded respectively. A reference potential is connected between the fifth port and the second resistor 205. A capacitor 209 is connected between the eighth port and the power supply 203, and the capacitor 209 is connected to power. The electric screwdriver 100 comprises a shell 102, a motor 103 and an output main shaft 104 which are connected are arranged in the shell 102, one end of the output main shaft 104 extends out of the shell 102 and is connected with a screwdriver nozzle 105, and the platinum resistor element 101 is arranged on the surface of a shell of the motor.
The following table shows the temperature and torque of windings of a certain motor model:
the circuit adopts a single-stage proportional operational amplifier circuit to amplify the sampling voltage, and the amplification factor A=1+R 3 /R 2 =11, output voltage V OUT ＝－V in *A+Vref，(V in To sample voltage, V ref Reference voltage), the output has larger change as long as the resistance value of the thermistor has small change, and finally the real-time temperature change of the motor can be obtained through AD sampling calculation of the programming control unit.
The present embodiment employs a class a platinum resistance element 101 with standard coefficient tcr= 0.003851, and the temperature-resistance characteristics of the platinum resistance element 101: r is R T ＝R 0 [1+aT+bT 2 -cT 3 (T-100)]
R T The resistance at temperature T, R0 at 0 ℃, and the coefficients a, b, c are
| Temperature (temperature) | a | b | c |
| T<0 | 3.90802×10 -3 | 5.80195×10 -7 | 4.27351×10 -12 |
| T≥0 | 3.90802×10 -3 | 5.80195×10 -7 | 0 |
R can be approximated from the above formula T ＝R 0 (1+aT)，R 0 =100Ω, and calculating the real-time temperature of the motor by combining the circuit design
The following table shows a comparison table of torque and temperature after torque compensation, and the motor driver can control the current of the motor by adopting a PID algorithm according to the collected change of the temperature of the motor winding, thereby achieving the purpose of torque compensation.
The torque compensation is realized by controlling the current, so the compensation of the torque is actually the compensation of the current, and the corresponding relation between the current compensation and the temperature of the motor can be approximately expressed by a formula,
C electric current ＝(T-T C ) K+c, where k is a coefficient, c is a constant, T is motor temperature, T C Is at normal temperature (working environment temperature). These parameters are not constant and will vary with the temperature of the motor and the magnitude of the set torque.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. The utility model provides a brushless servo electric screwdriver, includes electric screwdriver and brushless servo electric screwdriver controller, characterized by, electric connection between electric screwdriver and the brushless servo electric screwdriver controller, and the both ends of electric wire are aviation plug connector, aviation plug connector peg graft electric screwdriver and brushless servo electric screwdriver controller respectively, be equipped with platinum resistance element in the electric screwdriver, be equipped with torque compensation circuit in the brushless servo electric screwdriver, platinum resistance element and torque compensation circuit electric connection, torque compensation circuit, including amplifier, power, first resistance, second resistance, third resistance, thermistor, condenser, programming control unit and output, the amplifier is semiconductor element, and the amplifier is equipped with eight ports, and first port and fourth port electric connection, second port, thermistor, first resistance, power end are electric connection in proper order, and the third port is connected to between thermistor and the first resistance, and the fifth port is connected with second resistance one end electricity, and the sixth port is connected with third resistance one end electricity, and the second resistance other end electricity is connected with the third resistance end electricity, and the seventh electrical connection is connected with the electric connection point between the electric motor, seven electric connection point and the electric motor, the output unit is equipped with the output casing, the output device is connected with the output unit is including AD, the output device is connected with the output casing is stretched out to the electricity to the output unit, the output device is including the AD.
2. The brushless servo motor driver of claim 1, wherein the first and fourth ports, the second port and the thermistor are grounded respectively.
3. The brushless servo motor driver of claim 1, wherein a reference potential is connected between the fifth port and the second resistor.
4. The brushless servo motor driver of claim 1, wherein a capacitor is connected between the eighth port and the power source, the capacitor being electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810759945.XA CN108544416B (en) | 2018-07-11 | 2018-07-11 | Brushless servo electric screwdriver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810759945.XA CN108544416B (en) | 2018-07-11 | 2018-07-11 | Brushless servo electric screwdriver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108544416A CN108544416A (en) | 2018-09-18 |
| CN108544416B true CN108544416B (en) | 2024-04-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810759945.XA Active CN108544416B (en) | 2018-07-11 | 2018-07-11 | Brushless servo electric screwdriver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108544416B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB918666A (en) * | 1960-04-20 | 1963-02-13 | Welwyn Electric Ltd | Improvements in electrical resistors |
| DE1703316A1 (en) * | 1968-05-02 | 1972-03-09 | Pressluftwerkzeug U Maschb Pre | Screwdrivers |
| CN103107756A (en) * | 2011-11-14 | 2013-05-15 | 三星电子株式会社 | Apparatus and method for controlling stepping motor |
| CN103386666A (en) * | 2012-05-11 | 2013-11-13 | 数泓科技股份有限公司 | Electronic type torque wrench provided with automatic compensation device of output torsion |
| CN204627582U (en) * | 2015-04-10 | 2015-09-09 | 西安思坦仪器股份有限公司 | Memory-type tubing string axial tension, torsiograph |
| CN105415312A (en) * | 2015-10-30 | 2016-03-23 | 华中科技大学 | Circuit board clamping table and temperature measurement system |
| CN107390760A (en) * | 2017-07-25 | 2017-11-24 | 西安电子科技大学 | For the integrated circuit with temperature-compensating |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208867074U (en) * | 2018-07-11 | 2019-05-17 | 东莞市速动电子科技有限公司 | A kind of brushless servo electric screw driver |
-
2018
- 2018-07-11 CN CN201810759945.XA patent/CN108544416B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB918666A (en) * | 1960-04-20 | 1963-02-13 | Welwyn Electric Ltd | Improvements in electrical resistors |
| DE1703316A1 (en) * | 1968-05-02 | 1972-03-09 | Pressluftwerkzeug U Maschb Pre | Screwdrivers |
| CN103107756A (en) * | 2011-11-14 | 2013-05-15 | 三星电子株式会社 | Apparatus and method for controlling stepping motor |
| CN103386666A (en) * | 2012-05-11 | 2013-11-13 | 数泓科技股份有限公司 | Electronic type torque wrench provided with automatic compensation device of output torsion |
| CN204627582U (en) * | 2015-04-10 | 2015-09-09 | 西安思坦仪器股份有限公司 | Memory-type tubing string axial tension, torsiograph |
| CN105415312A (en) * | 2015-10-30 | 2016-03-23 | 华中科技大学 | Circuit board clamping table and temperature measurement system |
| CN107390760A (en) * | 2017-07-25 | 2017-11-24 | 西安电子科技大学 | For the integrated circuit with temperature-compensating |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108544416A (en) | 2018-09-18 |
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Country or region after: China Address after: Room 1601, Building 1, No. 5, Keji Second Road, Songshanhu Park, Dongguan, Guangdong 523000 Applicant after: Quick acting intelligent tightening technology (Guangdong) Co.,Ltd. Address before: No. 19, Southwest 1st Lane, Qiaochang Road, Dazhou Community, Qiaotou Town, Dongguan City, Guangdong Province, 523000 Applicant before: DONGGUAN SUDONG ELECTRONIC TECHNOLOGY Co.,Ltd. Country or region before: China |
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