CN109159211B - Permanent magnet variable-frequency woodworking multi-blade sawing machine control system - Google Patents
Permanent magnet variable-frequency woodworking multi-blade sawing machine control system Download PDFInfo
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- CN109159211B CN109159211B CN201811291372.9A CN201811291372A CN109159211B CN 109159211 B CN109159211 B CN 109159211B CN 201811291372 A CN201811291372 A CN 201811291372A CN 109159211 B CN109159211 B CN 109159211B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
- B27B5/02—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor characterised by a special purpose only
- B27B5/06—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor characterised by a special purpose only for dividing plates in parts of determined size, e.g. panels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B25/00—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees
- B27B25/04—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees with feed chains or belts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
- B27B5/29—Details; Component parts; Accessories
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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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/12—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control
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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
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
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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
Abstract
The invention relates to a permanent magnet variable frequency woodworking multi-blade saw control system, which comprises a main shaft driving a multi-blade saw to rotate, a main shaft lifting table, a feeding conveyor belt, a pressing wheel and an output unit, wherein the main shaft is provided with a plurality of permanent magnet variable frequency saw guide rails; the output unit comprises a permanent magnet motor driving the main shaft to rotate, a main shaft lifting table asynchronous motor driving the main shaft lifting table to lift, a feeding conveyor belt asynchronous motor driving the feeding conveyor belt to rotate and a pinch roller lifting asynchronous motor driving the pinch roller to lift; the system also comprises a main control unit and a man-machine interaction unit; the main control unit is electrically connected with the output unit and the man-machine interaction unit; the main control unit has a frequency conversion function, the voltage frequency output to the output unit can be adjusted, a compensation unit is arranged in the main control unit, the compensation unit collects load current to the main control unit, and the main control unit automatically adjusts output voltage according to feedback current; the man-machine interaction unit is used for sending a control signal to the main control unit to execute actions, so that the occurrence rate of saw blade burning and machine clamping can be reduced, and the production efficiency is improved.
Description
Technical Field
The invention relates to a control system of a woodworking multi-blade saw, in particular to a control system of a permanent magnet variable-frequency woodworking multi-blade saw.
Background
The log multi-blade saw is developed in the years, and the multi-blade saw replaces a band saw, so that the production efficiency is greatly improved, the yield is improved, and good economic benefits are brought to a wood processing plant; the log multi-blade sawing machine has the advantages that as the log multi-blade sawing machine is provided by the patent with the application number of CN201320164575.8, through the structural cooperation between the pressing navigation mechanism of the pressing navigation output part and the discharging guide piece, the pressing navigation mechanism can always press cut sheet timber on the discharging guide piece, so that the cut sheet timber is prevented from loosening, the saw blade part is protected, the normal use of a product is ensured, and the use quality effect is ensured; moreover, the compaction navigation mechanism and the discharging guide piece are respectively connected with the driving part, so that enough pulling force is ensured, cut sheet timber is automatically and stably discharged, manual material pulling is avoided, manpower and material resources are saved, the production efficiency is improved, the cost input is reduced, and the potential safety hazard is effectively reduced; however, in practical use, the log sawing machine adopts a single asynchronous motor as a driving motor to drive a plurality of saws, when in use, the problems of motor burnout caused by the reduction of the motor rotation speed during saw blade burning, machine clamping and full load overload are solved, the performance of the motor can be influenced by the fluctuation of a power grid in some mountainous areas, and the motor with special voltage and special frequency is required to be customized because the motor is influenced by foreign voltage and frequency different from domestic voltage, so that the cost and inconvenience are increased in selection, wet materials and dry materials are used for cutting logs, the motor with high power is hard and soft, the electric energy consumption is high, the influence fluctuation of the whole power grid is great, the existing asynchronous motor can not meet the wood cutting requirement of a wood processing factory, and the conditions of insufficient output power and burnout of the motor are similar to those of people of all kinds of people.
The full-automatic woodworking multifunctional multi-blade saw cutting machine has the advantages that as the full-automatic woodworking multifunctional multi-blade saw cutting machine is provided with the application number of CN201310367708.6, each blade is driven by one motor, so that the power consumption of the motor can be reduced, and a saw blade can be selected for cutting according to the production and processing requirements, so that the functions of trimming and trimming of wood, cutting of a wood board into wood strips, cutting of the wood strips Cheng Mufang and the like are realized; the variable frequency motor is used, so that the cutting speed of the cutting machine can be adjusted; however, when the cutting machine is used, although the variable frequency motor is adopted to regulate the speed, the rotating speed of the multi-blade saw and the rotating speed of the conveyor belt are required to be considered to be regulated, and in actual use, the rotating speed of each motor is not controlled by manpower, so that the problem that the motor burns out due to the fact that the rotating speed of the motor is reduced when the saw blade is burnt, the machine is blocked and the full load is overloaded is not improved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a control system of the energy-saving and high-efficiency permanent magnet variable-frequency woodworking multi-blade saw equipment, which changes the bad conditions in the prior art, responds to the call of national energy conservation and emission reduction, and solves the problem that the woodworking equipment affects the work of a motor due to the instability of the voltage of a power grid.
The technical scheme of the invention is as follows:
a permanent magnet variable frequency woodworking multi-blade saw control system comprises a main shaft for driving a multi-blade saw to rotate, a main shaft lifting table, a feeding conveyor belt, a pressing wheel and an output unit; the output unit comprises a permanent magnet motor driving the main shaft to rotate, a main shaft lifting asynchronous motor driving the main shaft lifting table to lift, a feeding asynchronous motor driving the feeding conveyor belt to rotate and a pressing wheel lifting asynchronous motor driving the pressing wheel to lift; the system also comprises a main control unit and a man-machine interaction unit; the main control unit is electrically connected with the output unit and the man-machine interaction unit; the main control unit is connected with a mains supply to obtain electricity, has a frequency conversion function, can adjust the voltage frequency output to the output unit, is internally provided with a compensation unit, collects the load current output to the permanent magnet motor and feeds the load current back to the main control unit, and the main control unit automatically adjusts the output voltage according to the fed-back load current; the man-machine interaction unit is used for sending a control signal to the main control unit, and the main control unit executes actions according to the control signal.
Further, the man-machine interaction unit comprises a plurality of control switches and a touch control screen; each control switch is used for inputting a control instruction to the main control unit, and the main control unit executes corresponding actions according to the control instruction; the touch control screen inputs a control instruction and an adjustment instruction to the main control unit, the main control unit executes corresponding actions according to the control instruction, and internal parameters are changed according to the adjustment instruction.
Further, the main control unit comprises a rectifying module, a filtering module, a parameter control module, a frequency conversion module, a permanent magnet inversion output module and an asynchronous inversion output module; the input end of the rectifying module is connected with the mains supply to rectify the mains supply into direct current, the output end of the rectifying module is connected with the input end of the filtering module, the filtering module filters clutters of input voltage, the output end of the filtering module is connected with the input end of the frequency conversion module through the parameter control module, the parameter control module is electrically connected with the man-machine interaction unit, and the man-machine interaction unit adjusts parameters of the output voltage through the parameter control module; the output end of the frequency conversion module is connected with the input end of the permanent magnet inversion output module and the input end of the asynchronous inversion output module, and the frequency conversion module is used for changing the voltage frequency output to the permanent magnet inversion output module and the asynchronous inversion output module; the output end of the permanent magnet inversion output module is connected with the permanent magnet motor and outputs starting voltage to the permanent magnet motor; and the output end of the asynchronous inversion output module is connected with the main shaft lifting asynchronous motor, the feeding asynchronous motor and the pinch roller lifting asynchronous motor to output starting voltages to the main shaft lifting asynchronous motor, the feeding asynchronous motor and the pinch roller lifting asynchronous motor.
Further, the main shaft lifting asynchronous motor, the feeding asynchronous motor and the pinch roller lifting asynchronous motor are electrically connected with the output end of the asynchronous inversion output module through a three-gear change-over switch; the input end of the three-gear change-over switch is electrically connected with the output end of the asynchronous inversion output module, and three output contacts of the three-gear change-over switch are respectively electrically connected with the input ends of the main shaft lifting asynchronous motor, the feeding asynchronous motor and the pinch roller lifting asynchronous motor.
Further, the frequency conversion module comprises a torque angle calculation module and a voltage space vector generator; the torque angle calculation module receives the voltage signal input by the parameter control module, calculates the required motor torque angle and sends the motor torque angle to the voltage space vector generator, and the voltage space vector generator changes the voltage space vector output to the permanent magnet inversion output module according to the motor torque angle.
Further, the frequency conversion module further comprises a coordinate conversion module, a current regulator and an oscillation suppression module; the output end of the permanent magnet inversion output module is provided with a current transformer for sampling three-phase current of the output end, the current transformer sends the three-phase current to the coordinate transformation module and the oscillation suppression module, the coordinate transformation module receives a coordinate transformation angle of the output voltage of the voltage space vector generator, integrates the three-phase current into two-phase rotation coordinate current and outputs the two-phase rotation coordinate current to the voltage space vector generator and the current regulator, and the current regulator compensates voltage components to the voltage space vector generator according to the two-phase rotation coordinate current so as to ensure that the current vector is implemented correctly in amplitude and direction; the voltage space vector generator changes the voltage space vector of the output voltage according to the two-phase rotating coordinate current and the compensation voltage component; the oscillation suppression module collects stator voltage of the permanent magnet inversion output module, compensates stator frequency for the permanent magnet inversion output module according to the fed back three-phase current, and ensures running stability of the motor.
Further, the compensation unit is electrically connected with the current transformer and the voltage space vector generator respectively, samples the current fed back by the current transformer, and compensates dynamic compensation voltage for the voltage space vector generator.
The invention has the following beneficial effects:
1. the invention adopts the permanent magnet motor to drive the main shaft of the multi-blade saw, the electric energy consumed by the motor when the permanent magnet motor is in idle load is much smaller than the electric energy consumed by the asynchronous motor, and the time of the maximum power output in the loading process is short, so that the whole use process does not need to consume too much electric energy, and the energy-saving effect is achieved.
2. The invention provides a control system of energy-saving high-efficiency permanent magnet variable-frequency woodworking multi-blade sawing machine equipment, which realizes automatic adjustment of the running speed rate of a permanent magnet motor by changing the power supply frequency, and the rotating speed of the permanent magnet motor can be changed randomly through a man-machine interaction unit, so that the rotating speed is suitable for the rotating speed required by wood cutting, and the requirements of different woods are met.
3. And the dynamic compensation voltage is compensated to the voltage space vector generator through the compensation unit, so that the output voltage is automatically regulated, and the rotating speeds of the permanent magnet motor and the feeding asynchronous motor are dynamically regulated according to the load during the operation of the system.
4. The voltage space vector generator calculates a voltage space vector according to a motor steady-state model, dynamic voltage compensation and a motor torque angle; the module can be considered as the combination of feedforward control and compensation control, namely, feedforward control is completed according to a motor steady-state model, and influences caused by motor parameter mismatch, temperature drift, modeling errors and the like are eliminated according to dynamic voltage compensation; the current regulation module generates a compensation voltage component to ensure that the current vector is implemented correctly in both amplitude and direction; the oscillation suppression module dynamically compensates the stator frequency according to a small signal analysis model of motor power disturbance so as to ensure the running stability of the motor.
5. Through three-gear change-over switch, an asynchronous inversion output module can drive three asynchronous motors to operate, one-to-three is realized, and circuit cost and use cost are saved.
Drawings
FIG. 1 is an internal structural view of a permanent magnet variable frequency woodworking multi-blade saw apparatus of the present invention;
FIG. 2 is an external view of the permanent magnet variable frequency woodworking multi-blade saw equipment of the invention
FIG. 3 is a schematic diagram of a control system according to the present invention;
FIG. 4 is a schematic block diagram of a master control unit of the present invention;
FIG. 5 is a control schematic diagram of a frequency conversion module according to the present invention;
fig. 6 is a control schematic diagram of the compensation unit.
The reference numerals in the drawings are as follows:
101. a main shaft; 102. a main shaft lifting table; 103. a feeding conveyor belt; 104. a pinch roller; 1. a main control unit; 11. a rectifying module; 12. a filtering module; 13. a parameter control module; 14. a frequency conversion module; 141. a moment angle calculation module; 142. a voltage space vector generator; 143. a coordinate transformation module; 144. a circuit regulator; 145. an oscillation suppression module; 15. a permanent magnet inversion output module; 16. an asynchronous inversion output module; 17. a compensation unit; 2. an output unit; 20. a three-gear change-over switch; 121. a permanent magnet motor; 122. a main shaft lifting asynchronous motor; 123. feeding an asynchronous motor; 124. a pinch roller lifting asynchronous motor; 3. a man-machine interaction unit; 31. a control switch; 32. touching a control screen; 4. a current transformer.
Detailed Description
The invention will now be described in detail with reference to the drawings and to specific embodiments.
Referring to fig. 1 to 6, a control system of a permanent magnet variable frequency woodworking multi-blade saw comprises a main shaft 101 for driving a multi-blade saw to rotate, a main shaft lifting table 102, a feeding conveyor belt 103, a pressing wheel 104 and an output unit 2; the output unit 2 comprises a permanent magnet motor 121 driving the main shaft 101 to rotate, a main shaft lifting asynchronous motor 122 driving the main shaft lifting table 102 to lift, a feeding asynchronous motor 123 driving the feeding conveyor belt 103 to rotate and a pressing wheel lifting asynchronous motor 124 driving the pressing wheel 104 to lift; the system also comprises a main control unit 1 and a man-machine interaction unit 3; the main control unit 1 is electrically connected with the output unit 2 and the man-machine interaction unit 3; the main control unit 1 is connected with a mains supply to obtain electricity, has a frequency conversion function, can adjust the voltage frequency output to the output unit 2, and is internally provided with a compensation unit 17, wherein the compensation unit 17 collects the load current output to the permanent magnet motor 121 and feeds back the load current to the main control unit 1, and the main control unit 1 automatically adjusts the output voltage according to the fed-back load current; the man-machine interaction unit 3 is configured to send a control signal to the main control unit 1, and the main control unit 1 performs an action according to the control signal.
Further, referring to fig. 3, the man-machine interaction unit 3 includes a plurality of control switches 31 and a touch control screen 32; each control switch 31 is used for inputting a control instruction to the main control unit 1, and the main control unit 1 executes corresponding actions according to the control instruction; the touch control screen 32 inputs a control command and an adjustment command to the main control unit 1, the main control unit executes corresponding actions according to the control command, and internal parameters are changed according to the adjustment command; the control switches 31 have the functions of spindle start, spindle stop, emergency stop, feeding start, feeding stop, inching reverse rotation, spindle up, spindle down, pinch roller up and pinch roller down respectively.
Further, referring to fig. 4, the main control unit 1 includes a rectifying module 11, a filtering module 12, a parameter control module 13, a frequency conversion module 14, a permanent magnet inversion output module 15 and an asynchronous inversion output module 16; the input end of the rectifying module 11 is connected with the mains supply to rectify the mains supply into direct current, the output end of the rectifying module 11 is connected with the input end of the filtering module 12, the filtering module 12 filters clutters of input voltage, the output end of the filtering module 12 is connected with the input end of the frequency conversion module 14 through the parameter control module 13, the parameter control module 13 is electrically connected with the man-machine interaction unit 3, and the man-machine interaction unit 3 adjusts parameters of the output voltage through the parameter control module 13; the output end of the frequency conversion module 14 is connected with the input end of the permanent magnet inversion output module 15 and the input end of the asynchronous inversion output module 16, and the frequency conversion module 14 is used for changing the voltage frequency output to the permanent magnet inversion output module 15 and the asynchronous inversion output module 16; the output end of the permanent magnet inversion output module 15 is connected with the permanent magnet motor 121, and outputs starting voltage to the permanent magnet motor 121; the output end of the asynchronous inversion output module 16 is connected with the main shaft lifting asynchronous motor 122, the feeding asynchronous motor 123 and the pinch roller lifting asynchronous motor 124, and outputs starting voltages to the main shaft lifting asynchronous motor 122, the feeding asynchronous motor 123 and the pinch roller lifting asynchronous motor 124.
Further, the main shaft lifting asynchronous motor 122, the feeding asynchronous motor 123 and the pinch roller lifting asynchronous motor 124 are electrically connected with the output end of the asynchronous inversion output module 16 through a three-gear change-over switch 20; the input end of the third gear change-over switch 20 is electrically connected with the output end of the asynchronous inversion output module 16, and three output contacts of the third gear change-over switch 20 are respectively electrically connected with the input ends of the main shaft lifting asynchronous motor 122, the feeding asynchronous motor 123 and the pinch roller lifting asynchronous motor 124.
Further, referring to fig. 5, the frequency conversion module 14 includes a torque angle calculation module 141 and a voltage space vector generator 142; the torque angle calculation module 141 receives the voltage signal input by the parameter control module 13, calculates the required motor torque angle, and sends the calculated motor torque angle to the voltage space vector generator 142, and the voltage space vector generator 142 changes the voltage space vector output to the permanent magnet inversion output module 15 according to the motor torque angle.
Further, referring to fig. 5, the frequency conversion module 14 further includes a coordinate transformation module 143, a current regulator 144, and an oscillation suppression module 145; the output end of the permanent magnet inversion output module 15 is provided with a current transformer 4 for sampling three-phase current of the output end, the current transformer 4 sends the three-phase current to the coordinate transformation module 143 and the oscillation suppression module 145, the coordinate transformation module 143 receives a coordinate transformation angle of the output voltage of the voltage space vector generator 142, integrates the three-phase current into two-phase rotation coordinate current and outputs the two-phase rotation coordinate current to the voltage space vector generator 142 and the current regulator 144, and the current regulator 144 compensates the voltage component to the voltage space vector generator 142 according to the two-phase rotation coordinate current so as to ensure that the current vector is implemented correctly in the amplitude and the direction; the voltage space vector generator 142 changes the voltage space vector of the output voltage according to the two-phase rotation coordinate current and the compensation voltage component; the oscillation suppression module 145 collects the stator voltage of the permanent magnet inversion output module 15, compensates the stator frequency for the permanent magnet inversion output module 15 according to the fed back three-phase current, and ensures the running stability of the motor.
Further, referring to fig. 6, the compensation unit 17 is electrically connected to the current transformer 4 and the voltage space vector generator 142, respectively, samples the current fed back by the current transformer 4, and compensates the dynamic compensation voltage to the voltage space vector generator 142.
The working flow of the invention is as follows:
the working process of the woodworking multi-blade saw control equipment provided by the invention is as follows: feeding, namely placing timber on a feeding conveyor belt 103, controlling a pressing wheel 104 to press down and tightly clamp the timber through a pressing wheel lifting asynchronous motor 124 and a pressing wheel descending switch, starting the feeding conveyor belt 103 to drive the timber to feed to a multi-blade saw, and enabling the multi-blade saw to be driven by a main shaft 101 to rotate so as to cut the timber; when the saw blade of the multi-blade saw is to be replaced, the main shaft lifting switch is pressed to start the main shaft lifting asynchronous motor 122, the main shaft lifting table 102 is driven to lift, the saw blade is replaced, and after replacement, the main shaft lifting table 102 is controlled to descend to the original position by pressing the main shaft lifting switch.
In this embodiment, the control device for the woodworking multi-blade saw is composed of two main shafts 101, so that the system has two permanent magnet motors 121, and the rotation speed and torque of the two permanent magnet motors 121 corresponding to the two output main shafts 101 are integrated through the system, and as the frequency conversion module 14 in the main control unit 1 has a frequency conversion function, the output voltage frequency of the permanent magnet inversion output module 15 can be changed to change the rotation speed of the permanent magnet motors 121, and the parameters of the parameter control unit 13 can be changed through the touch control screen 32 in the man-machine interaction unit 3, so that the rotation speed of the permanent magnet motors 121 is changed, and the needs of different woods are satisfied.
The system integrates the output of the permanent magnet motor 121 and has the function of changing the starting voltage frequency of the asynchronous motor to change the rotating speed and torque, and because the multi-blade saw is provided with three asynchronous motors, the three asynchronous motors are controlled by connecting the three-gear change-over switch 20 with the asynchronous inversion output module 16 of the main control unit, and because the feeding conveyor belt 103 is required to work together with the main shaft 101, the system actually operates as follows, when the pressing wheel 104 is required to lift, the three-gear change-over switch 20 is shifted to the position connected with the pressing wheel lifting asynchronous motor 124, the pressing wheel 104 is lifted by clicking the control switch 31 corresponding to the pressing wheel lifting and pressing wheel lowering, when the main shaft 101 is required to lift, the three-gear change-over switch 20 is shifted to the position connected with the main shaft lifting asynchronous motor 122, the main shaft lifting is realized by clicking the control switch 31 corresponding to the main shaft lifting and main shaft lowering buttons, the three-gear change-over switch 20 is returned to the position connected with the feeding conveyor belt 103 after the adjustment, and the operation can also be realized on the touch control screen 32.
In the frequency conversion module 14 of the present invention, the voltage space vector 142 calculation module calculates a voltage space vector according to the motor steady-state model, the dynamic voltage compensation and the motor torque angle delivered from the motor torque angle module 141; the module is equivalent to the combination of feedforward control and compensation control, namely, feedforward control is completed according to a motor steady-state model, and influences caused by motor parameter mismatch, temperature drift, modeling errors and the like are eliminated according to dynamic voltage compensation; the current regulation module 144 generates a compensation voltage component to ensure that the current vector is implemented correctly in both magnitude and direction; the oscillation suppression module 145 dynamically compensates the stator frequency based on a small signal analysis model of the motor power disturbance to ensure stability of the motor operation.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (4)
1. A permanent magnet variable frequency woodworking multi-blade saw control system is characterized in that: comprises a main shaft (101) for driving the multi-blade saw to rotate, a main shaft lifting table (102), a feeding conveyor belt (103), a pressing wheel (104) and an output unit (2); the output unit (2) comprises a permanent magnet motor (121) for driving the main shaft (101) to rotate, a main shaft lifting asynchronous motor (122) for driving the main shaft lifting table (102) to lift, a feeding asynchronous motor (123) for driving the feeding conveyor belt (103) to rotate and a pressing wheel lifting asynchronous motor (124) for driving the pressing wheel (104) to lift; the system also comprises a main control unit (1) and a man-machine interaction unit (3); the main control unit (1) is electrically connected with the output unit (2) and the man-machine interaction unit (3); the main control unit (1) is connected with a mains supply to obtain electricity, has a frequency conversion function, can adjust the voltage frequency output to the output unit (2), a compensation unit (17) is arranged in the main control unit (1), the compensation unit (17) collects the load current output to the permanent magnet motor (121) and feeds the load current back to the main control unit (1), and the main control unit (1) automatically adjusts the output voltage according to the fed load current; the man-machine interaction unit (3) is used for sending a control signal to the main control unit (1), and the main control unit (1) executes actions according to the control signal; the main control unit (1) comprises a rectifying module (11), a filtering module (12), a parameter control module (13), a frequency conversion module (14), a permanent magnet inversion output module (15) and an asynchronous inversion output module (16); the input end of the rectifying module (11) is connected with mains supply to rectify the mains supply into direct current, the output end of the rectifying module (11) is connected with the input end of the filtering module (12), the filtering module (12) filters clutters of input voltage, the output end of the filtering module (12) is connected with the input end of the frequency conversion module (14) through the parameter control module (13), the parameter control module (13) is electrically connected with the man-machine interaction unit (3), and the man-machine interaction unit (3) adjusts parameters of the output voltage through the parameter control module (13); the output end of the frequency conversion module (14) is connected with the input end of the permanent magnet inversion output module (15) and the input end of the asynchronous inversion output module (16), and the frequency conversion module (14) is used for changing the voltage frequency output to the permanent magnet inversion output module (15) and the asynchronous inversion output module (16); the output end of the permanent magnet inversion output module (15) is connected with the permanent magnet motor (121) and outputs starting voltage to the permanent magnet motor (121); the output end of the asynchronous inversion output module (16) is connected with the main shaft lifting asynchronous motor (122), the feeding asynchronous motor (123) and the pinch roller lifting asynchronous motor (124) to output starting voltages to the main shaft lifting asynchronous motor (122), the feeding asynchronous motor (123) and the pinch roller lifting asynchronous motor (124); the frequency conversion module (14) comprises a torque angle calculation module (141) and a voltage space vector generator (142); the torque angle calculation module (141) receives the voltage signal input by the parameter control module (13), calculates the required motor torque angle and sends the motor torque angle to the voltage space vector generator (142), and the voltage space vector generator (142) changes the voltage space vector output to the permanent magnet inversion output module (15) according to the motor torque angle; the frequency conversion module (14) further comprises a coordinate conversion module (143), a current regulator (144) and an oscillation suppression module (145); the output end of the permanent magnet inversion output module (15) is provided with a current transformer (4) for sampling three-phase current at the output end, the current transformer (4) sends the three-phase current to the coordinate transformation module (143) and the oscillation suppression module (145), the coordinate transformation module (143) receives a coordinate transformation angle of the output voltage of the voltage space vector generator (142), the three-phase current is integrated into two-phase rotation coordinate current and is output to the voltage space vector generator (142) and the current regulator (144), and the current regulator (144) compensates voltage components to the voltage space vector generator (142) according to the two-phase rotation coordinate current so as to ensure that the current vectors are implemented correctly in amplitude and direction; the voltage space vector generator (142) changes a voltage space vector of the output voltage according to the two-phase rotation coordinate current and the compensation voltage component; the oscillation suppression module (145) collects stator voltage of the permanent magnet inversion output module (15), compensates stator frequency for the permanent magnet inversion output module (15) according to the fed back three-phase current, and ensures running stability of the motor.
2. A permanent magnet variable frequency woodworking multi-blade saw control system as claimed in claim 1, wherein: the man-machine interaction unit (3) comprises a plurality of control switches (31) and a touch control screen (32); each control switch (31) is used for inputting a control instruction to the main control unit (1), and the main control unit (1) executes corresponding actions according to the control instruction; the touch control screen (32) inputs a control instruction and an adjustment instruction to the main control unit (1), and the main control unit executes corresponding actions according to the control instruction and changes internal parameters according to the adjustment instruction.
3. A permanent magnet variable frequency woodworking multi-blade saw control system as claimed in claim 1, wherein: the main shaft lifting asynchronous motor (122), the feeding asynchronous motor (123) and the pinch roller lifting asynchronous motor (124) are electrically connected with the output end of the asynchronous inversion output module (16) through a three-gear change-over switch (20); the input end of the three-gear change-over switch (20) is electrically connected with the output end of the asynchronous inversion output module (16), and three output contacts of the three-gear change-over switch (20) are respectively electrically connected with the input ends of the main shaft lifting asynchronous motor (122), the feeding asynchronous motor (123) and the pinch roller lifting asynchronous motor (124).
4. A permanent magnet variable frequency woodworking multi-blade saw control system as claimed in claim 1, wherein: the compensation unit (17) is electrically connected with the current transformer (4) and the voltage space vector generator (142) respectively, samples the current fed back by the current transformer (4), and compensates dynamic compensation voltage for the voltage space vector generator (142).
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