CN104483868A - Intelligent feeder stepless speed regulation controller having motor protection function - Google Patents
Intelligent feeder stepless speed regulation controller having motor protection function Download PDFInfo
- Publication number
- CN104483868A CN104483868A CN201410599987.3A CN201410599987A CN104483868A CN 104483868 A CN104483868 A CN 104483868A CN 201410599987 A CN201410599987 A CN 201410599987A CN 104483868 A CN104483868 A CN 104483868A
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- chip microcomputer
- potentiometer
- stepless speed
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Direct Current Motors (AREA)
- Control Of Electric Motors In General (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses an intelligent feeder stepless speed regulation controller having a motor protection function. The controller comprises a fuse circuit (1), a reset switch (2), an emergency switch (3), a self-locking circuit (4), a transformer T1 (17), a rectification voltage stabilizing circuit (5), a zero cross detection circuit (15), a single-chip microcomputer U2 (20), a power source indicating circuit (6), an input setting circuit (7), a relay J1 driving protection circuit (16), a relay J2 driving circuit protection circuit (10), a material throwing indicating circuit (9), relays J1 and J2, a speed regulation driving output circuit (11), a sampling circuit (12), a fault indicating circuit (8), an output protection circuit (13) and a wiring terminal (14) which are connected in a circuit mode. The controller employs the single-chip microcomputer with an AD port as a core control element and further has advantages of simple structure, convenient input setting, good control performance, synchronous stepless speed regulation, reliable motor protection and great popularization values.
Description
Technical field
The present invention relates to controller, be specifically related to the feeder intelligent stepless speed setting controller protecting electric motors function.
Background technology
Along with the Mechanization Development of culture fishery; feeder is widely used; the work of feeder is realized by controller; also there is no a kind of stable stepless speed regulation at present and have the controller protecting material casting electric motors function; even if the square wave just adopting the change dutycycle that matrix and waver, Resistor-Capacitor Unit are formed when being had, driving controllable silicon and change the step speed regulation controller of output voltage.Due to the impact by electronic component performance, parameters precision, mechanical contact loose contact and environment for use, make the failure rate of mechanical timer high, electric machine speed regulation is very unstable, very easily stall, cause motor easily to burn, result of use extreme difference, raiser can not be adapted to and change the demand of throwing and raising distance.
Summary of the invention
The object of the invention is to: provide a kind of throwing to raise stable distance, without mechanical timer, there is the feeder intelligent stepless speed setting controller of protection electric motors function, adopt and have the single-chip microcomputer of AD port as core control element, input adopts direct regulator potentiometer, relay is passed through in output, optocoupler carries out strong and weak electricity isolation, protect and detect material casting motor load electric current by sample circuit, realizing throwing raises adjustable apart from stepless, the pass of timing, 1-90 minute and the setting of often opening, shed time 1-9 to arrange second, pause interval time 1-17 arranges and has the function of protection material casting motor second.
Technical solution of the present invention is: the electric loop of this controller is by insurance circuit, reset switch, emergency button, latching circuit, transformer, regulator rectifier circuit, zero cross detection circuit, single-chip microcomputer, power indicating circuit, input arranges circuit, relay J 1 Drive Protecting Circuit, relay J 2 driving circuit protection circuit, material casting indicating circuit, relay J 1 and J2, speed governing driver output circuit, sample circuit, failure indicating circuit, output protection circuit, connection terminal connects and composes, insurance circuit is made up of the fuse of fuse holder and the inner die cavity of insertion fuse holder, latching circuit is made up of the normally opened contact of relay J 1 and the reset contact of reset switch, input arranges circuit and is made up of the pin 3,4,5,6 of Chip Microcomputer A/D port and potentiometer W1, multiple clubfoot potentiometer W2-W4, resistance R2-R5, de-noising electric capacity C5-C8, speed governing driver output circuit is made up of with optocoupler U3, resistance R13-R15, bidirectional triode thyristor Q3 the pin 11 of single-chip microcomputer, sample circuit is made up of with optocoupler U4, sample resistance R18, diode D8, stabilivolt DW, electric capacity C13 and resistance R20-R21 the pin 12 of single-chip microcomputer, failure indicating circuit is made up of with light emitting diode DS3 and resistance R22 the pin 14 of single-chip microcomputer, zero cross detection circuit is made up of diode D1-D4, resistance R6-R9, electric capacity C9, triode Q2.
Wherein, described controller is formed by installing wiring board in cabinet, cabinet is formed by panel and the connection of rear plate by upper bottom half, panel and rear plate insert in the draw-in groove of cabinet, connection terminal installed by rear plate, connection terminal links start-up capacitance, blanking motor and material casting motor respectively, on panel, installation startup reset switch, emergency button, fuse holder, timing regulator potentiometer, throwing are raised distance adjustment potentiometer, are shed Timing potentiometer and dead time regulator potentiometer, and be printed on functional word, reset switch, emergency button, single-chip microcomputer, resistance, electric capacity, diode, light emitting diode, triode, integrated package of pressure-stabilizing, optocoupler, bidirectional triode thyristor, relay, the welding of clubfoot potentiometer in the circuit board, wiring board passes through reset switch, emergency button, clubfoot potentiometer be arranged on fuse holder and potentiometer are housed panel on, light emitting diode is facing to the hole of light emitting diode of panel, multiple little knob is arranged on the handle of multiple clubfoot potentiometer W2-W4, large knob is arranged on the handle of potentiometer W1, the signal wire of potentiometer W1 is welded on wiring board, the output line of wiring board is welded to the welding end of the correspondence being contained in rear plate upper connecting terminal.
During work, the latching circuit that controller is made up of through insurance circuit, reset switch and relay the AC power of 220V, through transformer pressure-reducing, rectification, one tunnel obtains zero cross signal pulse through zero cross detection circuit, deliver to single-chip microcomputer INT0 mouth, single-chip microcomputer exports the speed governing drive singal with synchronized; One tunnel obtains the 5V operating voltage needed for circuit after mu balanced circuit voltage stabilizing, makes single-chip microcomputer follow procedure instruction works; Single-chip microcomputer 4 AD ports and potentiometer, resistance, electric capacity forms timing, throw and raise distance, shed the input of time and dead time and arrange circuit, read the information that input is arranged, and carry out data processing, obtain steering order, drive latching circuit, material casting motor by different rotating speeds rotation, the work of blanking machine air gap respectively; After circuit working, material casting motor first High Rotation Speed 3 transfers command speed to after second, sample circuit detects the voltage on sample resistance simultaneously, judge that material casting motor overloads with or without overcurrent, blanking motor starts interval work after 15 seconds, timing terminates blanking motor and closes immediately, closes after material casting motor time delay 10 or several tens of seconds.
The present invention has the following advantages: 1. adopt the single-chip microcomputer with AD port as control core device, and make circuit simple, control accuracy is high, meets consumers' demand, and achieves the controlling functions adopting mechanical timer, time base circuit and mimic channel to realize; 2. eliminate mechanical timer and in use hold flimsy phenomenon of the failure, reduce user's maintenance cost; 3. adopt knob to regulate to arrange, it is simple to operate, easy to make, and solves and adopts mechanical key to hold flimsy problem, also solves the headache problem that when adopting button to carry out function setting, most people can not operate; 4. adopt and be detected zero pulse signal and software program, make speed governing export drive waveforms very stable, thus make the stable distance that feeds intake, Driving Torque is large; 5. by detecting the size of the load current of material casting motor, efficiently solving the fault that material casting motor burns because of putty or clamping stagnation, protecting motor; 6. by the display of failure indicating circuit, information is intuitive, clear, is convenient to user and finds, fixes a breakdown; 7. transfer indication speed to after utilizing software program control single chip computer to achieve material casting motor High Rotation Speed 3 second to rotate, blanking motor time delay 15 start in second, after timing terminates, time delay 10 or several tens of seconds close the function of material casting motor; 8. the INT0 port of single-chip microcomputer obtains zero-crossing pulse signal according to zero cross detection circuit, utilizes software program to export the speed governing drive singal with synchronized, realizes the stepless speed regulation of material casting motor and extremely low pulsation; 9. the function utilizing software program control single chip computer to achieve Guan Hechang on the position of timing to open; 10. production run operation is simple, and debugging is convenient, reduces production cost.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
Fig. 2 is the front elevation in kind of Fig. 1.
Fig. 3 is plate schematic diagram after Fig. 2.
Fig. 4 is Fig. 2 vertical view cutaway drawing.
In figure: 1 insurance circuit, 2 reset switches, 3 emergency buttons, 4 latching circuits, 5 regulator rectifier circuits, 6 power indicating circuits, 7 inputs arrange circuit, 8 failure indicating circuits, 9 material casting indicating circuits, 10 relay J 2 Drive Protecting Circuit, 11 speed governing driver output circuit, 12 sample circuits, 13 output protection circuits, 14 connection terminals, 15 zero cross detection circuits, 16 relay J 1 Drive Protecting Circuit, 17 transformer T1, 18 little knobs, 19 clubfoot potentiometer W2-W4, 20 single-chip microcomputers, 21 fuse holders, 22 large knobs, 23 potentiometer W1, 24 cabinets, 25, 28 start-up capacitances, 26 panels, plate after 27, 29 power leads, 30 wiring boards, 31 hole of light emitting diode.
Embodiment
As Figure 1-4, the electric loop of this controller is by insurance circuit 1, reset switch 2, emergency button 3, latching circuit 4, transformer 17T1, regulator rectifier circuit 5, zero cross detection circuit 15, single-chip microcomputer 20U2, power indicating circuit 6, input arranges circuit 7, relay J 1 Drive Protecting Circuit 16, relay J 2 driving circuit protection circuit 10, material casting indicating circuit 9, relay J 1 and J2, speed governing driver output circuit 11, sample circuit 12, failure indicating circuit 8, output protection circuit 13, connection terminal 14 connects and composes, wherein: insurance circuit 1 is made up of the fuse of fuse holder 21 and the inner die cavity of insertion fuse holder 21, latching circuit 4 is made up of the normally opened contact of relay J 1 and the reset contact of reset switch 2, input arranges circuit 7 and is made up of the pin 3,4,5,6 of the AD port of single-chip microcomputer 20U2 and potentiometer 23W1, multiple clubfoot potentiometer 19W2-W4, resistance R3-R6, de-noising electric capacity C5-C8, speed governing driver output circuit 11 is made up of with optocoupler U3, resistance R15-R18, bidirectional triode thyristor Q4 the pin 11 of single-chip microcomputer 20U2, sample circuit 12 is made up of with optocoupler U4, sample resistance R18, diode D8, stabilivolt DW, electric capacity C13 and resistance R20-R21 the pin 12 of single-chip microcomputer 20U2, failure indicating circuit 8 is made up of with light emitting diode DS3 and resistance R22 the pin 14 of single-chip microcomputer 20U2, zero cross detection circuit 15 is made up of diode D1-D4, resistance R7-R11, electric capacity C9, triode Q2-Q3.
Wherein, described controller is formed by installing wiring board 30 in cabinet 24, cabinet 24 is formed by panel 26 and rear plate 27 connection by upper bottom half, panel 26 and rear plate 27 insert in the draw-in groove of cabinet 24, connection terminal 14 installed by rear plate 27, connection terminal 14 link respectively start-up capacitance 25,28, blanking motor and material casting motor, panel 26 is installed and starts reset switch 2, emergency button 3, fuse holder 21, timing regulator potentiometer 23W1, multiple clubfoot potentiometer 19W2-W4, and be printed on functional word, reset switch 2, emergency button 3, single-chip microcomputer 20U2, resistance, electric capacity, diode, stabilivolt, light emitting diode, triode, integrated package of pressure-stabilizing, optocoupler, bidirectional triode thyristor, relay, multiple clubfoot potentiometer 19W2-W4 is welded on wiring board 30, wiring board 30 is by reset switch 2, emergency button 3, clubfoot potentiometer 19W2-W4 is arranged on and is equipped with on the panel 26 of fuse holder 21 and potentiometer 23W1, multiple light emitting diode is facing to the hole of light emitting diode 31 of panel 26, multiple little knob 18 is arranged on the handle of multiple clubfoot potentiometer 19W2-W4, large knob 22 is arranged on the handle of potentiometer 23W1, the signal wire of potentiometer 23W1 is welded on wiring board 30, the output line of wiring board 30 is welded to the welding end of the correspondence being contained in rear plate 27 upper connecting terminal 14, power lead 29 one end is welded on corresponding position through rear plate 27 through wires hole.
Of the present invention have in the feeder intelligent stepless speed setting controller of protection electric motors function, installs power transformer 17 in cabinet 24.
When circuit access power supply, after reset switch 2 is allocated to enable position, emergency button 3 is placed in normal position, the power supply of 220V is transformed into the alternating current of 9V through transformer 17, through the rectification of diode D1-D4, a road obtains zero cross signal pulse through zero cross detection circuit 15, delivers to the INT0 mouth of single-chip microcomputer 20U2, through single-chip microcomputer 20U2 process, export the speed governing drive singal with synchronized, one tunnel is through the filtering noise reduction of electric capacity C1 and C2, again through regulator block U1 and electric capacity C3, C4, obtain stable 5V direct current, circuit is powered, the light emitting diode DS1 of power indicating circuit 6 is made to obtain electric lighting by resistance R1, single-chip microcomputer 20U2 follow procedure instruction works, pin 9 output low level of single-chip microcomputer 20U2, by the base stage of resistance R10 to triode Q1, make the triode Q1 conducting being in switch working state, relay J 1 coil obtains electric, normally opened contact closes, self-locking is formed with the reset contact of reset switch 2, holding circuit continuous firing, be low level because single-chip microcomputer 20U2 pin 11 is drop-down, by resistance R15, optocoupler U3 is worked, after material casting motor M 1 High Rotation Speed 3 second, single-chip microcomputer 20U2 raises the data command after distance process according to arranging the throwing that input circuit 6 detects, determine the waveform that single-chip microcomputer 20U2 pin 11 exports, material casting motor M 1 is rotated by the rotating speed of specifying, the pin 7 of single-chip microcomputer 20U2 is drawn high as high level, make the triode Q4 base voltage being in switch working state for high, and not conducting, light emitting diode DS2 does not have electric current to pass through and not luminous, and single-chip microcomputer 20U2 inside starts timing simultaneously, makes pin 7 become low level after 15 second, by resistance R12, make triode Q4 conducting, blanking motor M 2 rotates, and light emitting diode DS2 is luminous by resistance R13, single-chip microcomputer 20U2 is when entering work, timing set by circuit 6 is set with regard to endless reading input, throws the data of raising distance, shedding time and dead time, by processing data, obtain timing respectively, throwing is raised distance, shed time and dead time, when the timing read in initial a minute remains unchanged, then as the numerical value of timing, this numerical value is preserved, and subtract the countdown counting of 1 with each minute, the moment of blanking motor M 2 before opening and closing, read in the time of shedding and dead time respectively in real time, and carry out with each second subtract 1 countdown counting, when the time countdown of shedding equals 0, send into the dead time, the pin 7 of single-chip microcomputer 20U2 exports high level, close blanking motor M 2, when the dead time, countdown equaled 0, feeding sheds the time, the pin 7 of single-chip microcomputer 20U2 is drop-down is low level, open blanking motor M 2, iterative cycles like this, until when timing equals 0, the pin 7 of single-chip microcomputer 20U2 exports high level, close blanking motor M 2, time delay 10 or several tens of seconds again, the pin 9 of single-chip microcomputer 20U2 is made to export high level, relay J 1 power-off, normally opened contact is opened, material casting motor M 1 stall, whole controller power-off, start timing terminates.
In the course of the work, the single-chip microcomputer 20U2 moment read timing, throw raise distance, shed the time, the dead time, zero cross detection circuit 15 pulse signal and monitor sample circuit whether work.Single-chip microcomputer 20U2, according to the zero-crossing pulse signal detected, exports speed regulating control signal with synchronized, if throwing is raised distance and is changed, using the numerical value after reading process as the new steering order controlling material casting motor M 1 rotating speed, change its rotating speed, simultaneously, sample circuit 12 detects the voltage on sample resistance R18, if when the electric current flowing through sample resistance R18 exceedes the trouble free service electric current of material casting motor M 1, optocoupler U4 conducting, the pin 12 of single-chip microcomputer 20U2 is made to be low level, after single-chip microcomputer 20U2 judges confirmation, by pin 11, 7 export high level, optocoupler U3 and triode Q4 not conducting, make material casting motor M 1, blanking motor M 2 quits work, and the pin 14 of single-chip microcomputer 20U2 becomes high level from low level, make failure indicating circuit work, light emitting diode DS3 is luminous, display fault.If timing changes, the numerical value that the numerical value after reading process and timing are preserved is compared, if different, then this numerical value preserved as new timing numerical value, and start countdown again by this numerical value; If read the numerical value after process be shutdown instruction, single-chip microcomputer 20U2 closes blanking motor M 2 immediately, and start with " 10 " or several tens of seconds subtract counting down of 1 second, complete machine powered-down when being 0, i.e. close after material casting motor M 1 time delay 10 or several tens of seconds.If reading the numerical value after process is often open instruction, then timing does not carry out the process that each minute subtracts 1, and the pin 9 of single-chip microcomputer 20U2 is always drop-down is low level, now only has deenergization, or is threaded to off-position, could close; When adopting external control device to control, reset switch 2 is placed in outer controlled position and timing knob scale is placed in normally open position; When controller of the present invention during causing trouble because of unpredictable reason, as long as emergency button 3 to be placed in emergency position, makes material casting motor M 1 and blanking motor M 2 work, carries out continuous bait throwing in.
Claims (9)
1. there is the feeder intelligent stepless speed setting controller of protection electric motors function, it is characterized in that: the electric loop of this controller is by insurance circuit (1), reset switch (2), emergency button (3), latching circuit (4), transformer (15) T1, regulator rectifier circuit (5), zero cross detection circuit (15), single-chip microcomputer (20) U2, power indicating circuit (6), input arranges circuit (7), relay J 1 Drive Protecting Circuit (16), relay J 2 driving circuit protection circuit (10), material casting indicating circuit (9), relay J 1 and J2, speed governing driver output circuit (11), sample circuit (12), failure indicating circuit (8), output protection circuit (13), connection terminal (14) connects and composes, wherein: insurance circuit (1) is made up of the fuse of fuse holder (21) and insertion fuse holder (21) inner die cavity.
2. the feeder intelligent stepless speed setting controller of protection electric motors function according to claim 1; it is characterized in that: detect the voltage on sample resistance R18 by sample circuit (12); if when the electric current flowing through sample resistance R18 exceedes the trouble free service electric current of material casting motor M 1; sample circuit (12) works; judge, after confirmation, close material casting motor M 1, blanking motor M 1 and failure indicating circuit (8) is worked through single-chip microcomputer (20) U2.
3. the feeder intelligent stepless speed setting controller having protection electric motors function according to claim 1, it is characterized in that: described controller is formed by installing wiring board (30) in cabinet (24), cabinet (24) is formed by panel (26) and rear plate (27) connection by upper bottom half, panel (26) and rear plate (27) insert in the draw-in groove of cabinet (24), rear plate (27) is installed connection terminal (14), connection terminal (14) links start-up capacitance (25 respectively, 28), blanking motor and material casting motor, the upper installation of panel (26) starts reset switch (2), emergency button (3), fuse holder (21), timing regulator potentiometer (23) W1, multiple clubfoot potentiometer (19) W2-W4, and be printed on functional word, reset switch (2), emergency button (3), single-chip microcomputer (20) U2, resistance, electric capacity, diode, stabilivolt, light emitting diode, triode, integrated package of pressure-stabilizing, optocoupler, bidirectional triode thyristor, relay, multiple clubfoot potentiometer (19) W2-W4 is welded on wiring board (30), and wiring board (30) is by reset switch (2), emergency button (3), clubfoot potentiometer (19) W2-W4 is arranged on and is equipped with on the panel (26) of fuse holder (21) and potentiometer (23) W1, light emitting diode is facing to the hole of light emitting diode (31) of panel (26), multiple little knob (18) is arranged on the handle of multiple clubfoot potentiometer (19) W2-W4, large knob (22) is arranged on the handle of potentiometer (23) W1, the signal wire of potentiometer (23) W1 is welded on wiring board (30), the output line of wiring board (30) is welded to the welding end of the correspondence being contained in rear plate (27) upper connecting terminal (14), and one end of power lead (29) is welded on corresponding position through rear plate (27) through wires hole.
4. the feeder intelligent stepless speed setting controller having protection electric motors function according to claim 1, is characterized in that: input arranges circuit (7) and is made up of the pin 3,4,5,6 of single-chip microcomputer (20) U2 and resistance R3-R6, potentiometer (23) W1, multiple clubfoot potentiometer (19) W2-W4 and electric capacity C5-C8.
5. the feeder intelligent stepless speed setting controller having protection electric motors function according to claim 1, is characterized in that: latching circuit (4) is made up of the normally opened contact of relay J 1 and the reset contact of reset switch (2).
6. the feeder intelligent stepless speed setting controller having protection electric motors function according to claim 1, is characterized in that: speed governing driver output circuit (11) is made up of with optocoupler U3, controllable silicon Q5, electric capacity C11, multiple resistance the port one 1 of single-chip microcomputer (20) U2.
7. the feeder intelligent stepless speed setting controller having protection electric motors function according to claim 1, is characterized in that: sample circuit (12) is made up of with optocoupler U4, sample resistance R18, diode D8, stabilivolt DW, electric capacity C13 and resistance R20-R21 the pin 12 of single-chip microcomputer (20) U2.
8. the feeder intelligent stepless speed setting controller having protection electric motors function according to claim 1, is characterized in that: failure indicating circuit (8) is made up of with light emitting diode DS3 and resistance R22 the pin 14 of single-chip microcomputer (20) U2.
9. the feeder intelligent stepless speed setting controller having protection electric motors function according to claim 1, is characterized in that: zero cross detection circuit (15) is made up of diode D1-D4, resistance R7-R11, electric capacity C9 and triode Q2-Q3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410599987.3A CN104483868A (en) | 2014-10-31 | 2014-10-31 | Intelligent feeder stepless speed regulation controller having motor protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410599987.3A CN104483868A (en) | 2014-10-31 | 2014-10-31 | Intelligent feeder stepless speed regulation controller having motor protection function |
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| Publication Number | Publication Date |
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| CN104483868A true CN104483868A (en) | 2015-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410599987.3A Pending CN104483868A (en) | 2014-10-31 | 2014-10-31 | Intelligent feeder stepless speed regulation controller having motor protection function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112366984A (en) * | 2020-11-11 | 2021-02-12 | 儒竞艾默生环境优化技术（上海）有限公司 | Temperature-adaptive PG motor drive control system and method |
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| CN102787974A (en) * | 2012-07-12 | 2012-11-21 | 上海交通大学 | Fully digital servo driver for AC permanent magnet synchronous motor for wind power generation pitch |
| CN103144937A (en) * | 2013-03-06 | 2013-06-12 | 西安科技大学 | System and method for intelligently monitoring belt-type conveyer for coal mine steel wire rope core |
| CN103929098A (en) * | 2014-04-16 | 2014-07-16 | 江苏恒深洋机械有限公司 | Intelligent digital display stepless speed regulation controller for feeder |
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- 2014-10-31 CN CN201410599987.3A patent/CN104483868A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101867343A (en) * | 2010-07-05 | 2010-10-20 | 南京大桥机器有限公司 | Permanent magnet synchronous motor (PMSM) AC servo system |
| JP2012213825A (en) * | 2011-03-31 | 2012-11-08 | Hitachi Koki Co Ltd | Electric power tool and battery unit |
| CN102787974A (en) * | 2012-07-12 | 2012-11-21 | 上海交通大学 | Fully digital servo driver for AC permanent magnet synchronous motor for wind power generation pitch |
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Application publication date: 20150401 |
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