CN201309426Y - Electric control device for electric wheel car - Google Patents
Electric control device for electric wheel car Download PDFInfo
- Publication number
- CN201309426Y CN201309426Y CNU2008201237762U CN200820123776U CN201309426Y CN 201309426 Y CN201309426 Y CN 201309426Y CN U2008201237762 U CNU2008201237762 U CN U2008201237762U CN 200820123776 U CN200820123776 U CN 200820123776U CN 201309426 Y CN201309426 Y CN 201309426Y
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- control device
- circuit
- electric wheel
- wheel truck
- weak magnetic
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The utility model relates to an electric control device for an electric wheel car, which comprises a main loop, an electric generator excitation loop, a weak magnetic control circuit, a skid suppression and protection circuit and a microcomputer control device, wherein the main loop comprises two sets of three-phase rectifier bridges which are connected with an electric generator of an electric wheel car, and each three-phase rectifier bridge is connected with brake loops of two pulling motors of the electric wheel car in series and electrically connected with the microcomputer control device; the electric generator excitation loop comprises a single-phase half-control rectifier bridge, a resistance-capacitance absorption module and a single-phase half-control rectifier bridge triggering board which are in parallel connection through automatic switches; the weak magnetic control circuit comprises three thyristors used for car weak magnetic control and a weak magnetic current divider; the skid suppression and protection circuit comprises two skid suppression thyristors connected with the main loop and is connected with the microcomputer control device through a skid suppression triggering board; and the microcomputer control device is electrically connected with the main loop through a microcomputer signal transducer. The utility model improves the safety for using cars and has the advantages of simple and convenient operation and maintenance.
Description
Technical field
The utility model relates to the electric wheel truck control convenience, particularly about a kind of electric wheel truck electrical controller.
Background technology
The electric wheel truck of load-carrying more than hundred tons that present domestic mine and large hydraulic engineering use is almost entirely from foreign procurement, and its electrical controller is along with the increase of tenure of use, and parts are aging gradually, cause vehicle failure rate height.Need from foreign procurement if change parts, the price height, procurement cycle is long, directly restricting the operating rate and the operating cost of automobile, and the electrical controller of 154 tons of electric wheel trucks of domestic-developed is not suitable for 170 tons of electric wheel trucks.Therefore need a kind of electric wheel truck electrical controller that is fit to domestic use cheaply of exploitation badly.
Summary of the invention
At the problems referred to above, the purpose of this utility model provides a kind of cost electric wheel truck electrical controller low, simple to operate.
For achieving the above object, the utility model is taked following technical scheme: a kind of electric wheel truck electrical controller is characterized in that comprising: a major loop, a generator excitation circuit, one weak magnetic control system circuit, one skids suppresses a protective circuit and a computer control device; Described major loop comprises two groups of three-phase commutation bridges that connect the electric wheel truck electrical generator, and two brake circuits of each described three-phase commutation bridge and described electric wheel truck are connected in series, and are electrically connected described computer control device; Described generator excitation circuit comprises that the single-phase half-controlled rectifier bridge, the capacitance-resistance that are connected in parallel by automatic switch absorb module and single-phase half-controlled rectifier bridge trigger board; Described generator excitation circuit is electrically connected described computer control device by described single-phase half-controlled rectifier bridge trigger board; Described weak magnetic control system circuit, comprise three weak magnetocrystalline brake tube and weak magnetic diverters that are used for the weak magnetic control system of automobile, each described weak magnetocrystalline brake tube connects one of them input end of two described three-phase commutation bridges respectively, and being electrically connected described computer control device by a weak magnetic trigger board, the contact of the master shunter in described weak magnetic diverter and the described major loop and the excitation winding of two described traction electric machines is electrically connected; The described inhibition protective circuit of skidding comprises the two inhibition thyristor of skidding, and two described skidding are suppressed thyristor and are connected in series described major loop, and suppresses trigger board by skidding and connect described computer control device; Described computer control device is electrically connected described major loop by microcomputer signal transmitting device, and described computer control device carries out computing to voltage, the current signal of each circuit of collecting, and sends control command.
Each brake circuit in the described major loop comprises a series connection branch road and is connected in parallel on the diode at described series arm two ends that described series arm comprises overcurrent relay, current sensor, traction electric machine, the braking resistor that is connected in series.
The positive terminal of the single-phase half-controlled rectifier bridge of described generator excitation circuit is in series with a resistance, this resistance contactless switch in parallel; The be connected in parallel storage battery of electric wheel truck of described single-phase half-controlled rectifier bridge two ends is connected with a resistance, a contactless switch and an anti-adverse current diode between one end of described storage battery and the negative pole end of described single-phase half-controlled rectifier bridge.
Braking resistor in the described brake circuit is respectively a slide rheostat and certain value resistance; Described major loop also comprises the excitation winding of a master shunter and described two traction electric machines, be connected electrically in regular turn between the positive terminal of a fixed value resistance in the described brake circuit and a described three-phase commutation bridge, between described master shunter and the described excitation winding, be provided with the contactless switch that is used to control break-make between described excitation winding and the described three-phase commutation bridge.
Two contacts that skid the inhibition thyristor in the described inhibition protection loop of skidding connect the cursor slide contact of the slide rheostat in the described brake circuit.
The utility model is owing to take above technical scheme, and it has the following advantages: 1, because the utility model has adopted up-to-date microcomputer controlled device, and the electric wheel truck emergency protection that provides is very comprehensive, improved the safety with car.2, the utility model adopts the color liquid crystal touch display screen first, show electric wheel truck operational factor, cumulant and failure message, all adopt Chinese to show on the read-out, chaufeur is come into plain view for the equipment situation of read-out, can also realize basic file operation by touch screen.3, the utility model electrical equipment is rationally distributed, and electrical equipment is installed and electric wheel truck electric system electromagnetic compatibility requirements is satisfied in wiring.4, the design of driver's cab operating console of the present utility model meets domestic driver's operating habit.
Description of drawings
Fig. 1 is a circuit diagram of the present utility model
Fig. 2 is that the connection of the weak magnetocrystalline brake tube of the utility model, single-phase half-controlled rectifier bridge and capacitance-resistance absorption module is carefully schemed
Fig. 3 is that the utility model skids and suppresses trigger board and suppress the connection diagram of thyristor with skidding
The specific embodiment
Below in conjunction with accompanying drawing the utility model is described in detail.
As shown in Figure 1, the utility model comprises a computer control device 1, its underpart is provided with one and is used for heat-dissipation fan 2, computer control device 1 links to each other with a plurality of electromagnetic contactor KM8, KM9 with a plurality of electropneumatic contactor KM1～KM7, and control their closed or disconnection, whether also gather their status signal simultaneously, it is normal to be used to detect contactless switch work.Computer control device 1 is gathered the signal of direction switch, Das Gaspedal and brake pedal in the driver control driver's cab, and the signal of gathering carried out giving each electropneumatic contactor KM1～KM7 and electromagnetic contactor KM8, KM9 output control signal after the logic operation, control the closed or disconnection of each contactless switch, thereby finish driver's operation intention, realize electric wheel truck advance traction, retreat traction, advance and brake and retreat various operating modes such as braking.In the present embodiment, be provided with seven electropneumatic contactor KM1～KM7 and two electromagnetic contactor KM8, KM9.
As shown in Figure 1, the utility model comprises a major loop, in major loop, be provided with two groups of three- phase commutation bridges 3,4, three- phase commutation bridge 3,4 input end connects the electrical generator 5 on the electric wheel truck respectively, wherein three-phase commutation bridge 3 negative pole ends connect overcurrent relay 6 in regular turn, current sensor 7, traction electric machine M1 on the electric wheel truck, braking resistor R1, three-phase commutation bridge 4, overcurrent relay 8, current sensor 9, traction electric machine M2 on the electric wheel truck, braking resistor R2, master shunter 10 and traction electric machine M1, the excitation winding of M2, traction electric machine M1, the excitation winding of M2 connects a positive terminal of three-phase commutation bridge 3, constitutes major loop of the present utility model.Major loop also comprises electropneumatic contactor KM1, KM2 in parallel with braking resistor R1, R2 respectively, is used for the use of control brake resistance R 1, R2.When electric wheel truck draws, electropneumatic contactor KM1, KM2 closure.The three-phase alternating current electric rectification that three- phase commutation bridge 3,4 sends electrical generator 5 is a direct current (DC). Overcurrent relay 6,8 is used to protect the safe operation of major loop, and when the electric current of major loop surpassed limit value, overcurrent relay 6,8 can automatic cutout.In the present embodiment, braking resistor R1 is a slide rheostat, and braking resistor R2 is a certain value resistance.
Wherein, overcurrent relay 6, current sensor 7, traction electric machine M1, braking resistor R1 and diode D1 constitute first brake circuit of electric wheel truck, and overcurrent relay 8, current sensor 9, traction electric machine M2, braking resistor R2 and diode D2 constitute second brake circuit on the electric wheel truck.In two brake circuits, braking resistor R1, R2 are electrically connected the positive pole of diode D1, D2 respectively.Electropneumatic contactor KM3 is connected between the positive pole of the negative pole of diode D1 and diode D2, computer control device 1 is controlled disconnection and the closure of electropneumatic contactor KM3 by the electric current that detects brake circuit and major loop, electropneumatic contactor KM3 closure when the brake circuit electric current equals main circuit current, otherwise disconnect electropneumatic contactor KM3, the closure of electropneumatic contactor KM3 has increased the braking force to electric wheel truck, to strengthen braking effect.
As shown in Figure 1, the utility model also comprises a weak magnetic control system circuit, it comprises three the weak magnetocrystalline brake tube 11 and the weak magnetic diverters 12 that are used for the weak magnetic control system of automobile, as shown in Figure 2, three weak magnetocrystalline brake tubes 11 connect the input end of three-phase commutation bridge 3 respectively, the other end of each weak magnetocrystalline brake tube 11 then connects weak magnetic diverter 12, weak magnetic diverter 12 again with major loop in master shunter 10 and the contact of the excitation winding of two traction electric machine M1, M2 be electrically connected.During weak magnetic control system circuit working, three not conductings simultaneously of weak magnetocrystalline brake tube 11, but have only one of them conducting, the electric current that passes through in the weak magnetocrystalline brake tube 11 of weak magnetic diverter 12 measurement conductings, and take off data flowed to computer control device 1.Weak magnetocrystalline brake tube 11 connects computer control device 1 by a weak magnetic trigger board 13 again, with the break-make by the weak magnetocrystalline brake tube 11 of computer control device 1 control.Wherein, one end of electropneumatic contactor KM4 and KM6 main contact all links to each other with weak magnetic diverter 12, one end of electropneumatic contactor KM5 and KM7 main contact all is connected with the positive terminal of three-phase commutation bridge 3, the other end of electropneumatic contactor KM5 and KM6 main contact is connected with excitation winding one end of traction electric machine M1, M2, and the other end of electropneumatic contactor KM4 and KM7 is connected with the other end of the excitation winding of traction electric machine M1, M2.Electropneumatic contactor KM4, KM5 and KM6, KM7 switch on and off in pairs, and the direction of current of the excitation winding of flow through traction electric machine M1, M2 is changed, thereby realize the commutation of electric wheel truck.When electric wheel truck is in forward traction state, electropneumatic contactor KM4, KM5 closure.
As Fig. 1, shown in Figure 3; the utility model also comprises the inhibition protective circuit of skidding; it comprises that two skid and suppress between the contact that thyristor 141,142 is serially connected in the positive terminal of three-phase commutation bridge 3 and traction electric machine M2 and braking resistor R2 in regular turn; skid and suppress the cursor slide contact of the contact connection braking resistor R1 between the thyristor 141,142, this cursor slide contact is positioned at 1/4th places of braking resistor R1.Simultaneously, two skid suppresses thyristor 141,142 and all suppresses trigger board 15 and link to each other with skidding, and skids to suppress trigger board 15 and connect computer control devices 1, realizes the skid control of inhibition thyristor 141,142 of 1 pair of computer control device.When computer control device 1 detects the cooresponding electric wheel truck tyre skidding of traction electric machine M1; the inhibition protective circuit of skidding is started working; computer control device 1 suppresses trigger board 15 by skidding will open the inhibition thyristor 141 of skidding; at this moment, three-phase commutation bridge 4; overcurrent relay 8; current sensor 9; traction electric machine M2 on the electric wheel truck; electropneumatic contactor KM2; master shunter 10; electropneumatic contactor KM4; traction electric machine M1; the excitation winding of M2; electropneumatic contactor KM5; skid and suppress thyristor 141; a braking resistor R1 of/4th and three-phase commutation bridge 4 formations one are skidded and are suppressed the loop.Shunt the electric current that flows into traction electric machine M1 in this inhibition loop of skidding, thereby limited the increase of traction electric machine M1 both end voltage, and then suppressed the cooresponding electric wheel truck tyre skidding of traction electric machine M1.In like manner, the method for the cooresponding electric wheel truck tyre skidding of inhibition traction electric machine M2 is identical with said method.
As shown in Figure 1, computer control device 1 of the present utility model connects a microcomputer signal transmitting device (not shown), and it comprises a plurality of voltage signal transmitters and current signal transmitter.Each voltage signal transmitter by the pig-tail wire on the terminal row (not shown) respectively with three- phase commutation bridge 3,4, traction electric machine M1 on the electric wheel truck, M2, and braking resistor R1, the two ends of R2 link to each other, be used to measure three- phase commutation bridge 3,4, traction electric machine M1 on the electric wheel truck, M2 and braking resistor R1, the voltage at R2 two ends, the voltage signal transmitter flows to computer control device 1 with the low-voltage signal that the voltage that records is converted into 0～10V then, calculating by computer control device 1, obtain three- phase commutation bridge 3,4, traction electric machine M1 on the electric wheel truck, M2, and braking resistor R1, the virtual voltage at R2 two ends.The current signal transmitter links to each other with weak magnetic diverter 12 with master shunter 10 by the pig-tail wire on the terminal row, master shunter 10 becomes the voltage signal of 0～75mV to export to the current signal transmitter current transformation that records earlier with weak magnetic diverter 12, the voltage signal that the current signal transmitter is converted to the voltage signal of 0～75mV 0～10V again flows to computer control device 1, by the computing of computer control device 1, obtain major loop and the actual current of the weak magnetocrystalline brake tube 11 of flowing through.
As shown in Figure 1, comprise a single-phase half-controlled rectifier bridge 16 in the generator excitation circuit of the present utility model, be parallel with trigger board 17 and capacitance-resistance at single-phase half-controlled rectifier bridge 16 two ends and absorb module 18, single-phase half-controlled rectifier bridge 16 links to each other with computer control device 1 by single-phase half-controlled rectifier bridge trigger board 17, and capacitance-resistance absorbs module 18 and is used for circuit filtering.One resistance R 9 is connected on the positive terminal of single-phase half-controlled rectifier bridge 16, and the be connected in parallel main contact of electropneumatic contactor KM8 of an end of resistance R 9 is accelerated the demagnetization in the energized circuit when electropneumatic contactor KM8 disconnects.The be connected in parallel storage battery 19 of electric wheel truck of single-phase half-controlled rectifier bridge 16 two ends, be serially connected with a main contact and the anti-adverse current diode D3 of a resistance R 15, electropneumatic contactor KM9 between one end of storage battery 19 and the negative pole end of single-phase half-controlled rectifier bridge 16, resistance R 15 is used for limiting the electric current of generator excitation circuit, and anti-adverse current diode D3 is used to prevent battery charge.The intermediate relay (not shown) of can also connecting on the coil of electropneumatic contactor KM8, when the electric wheel truck et out of order, this intermediate relay disconnects, generator excitation circuit can't be connected, the driver must press reset button on the operating console with this intermediate relay closure, and electropneumatic contactor KM8 could closedly also connect generator excitation circuit.One automatic switch 20, polyphone is connected in the generator excitation circuit, and when the circuit overcurrent, automatic switch 20 automatic cutouts are with each device in the protection generator excitation circuit.
The utility model also comprises: a constant voltage power suspply (not shown), its input end connects the storage battery (not shown) of electric wheel truck, mouth connects computer control device 1, single-phase half-controlled rectifier bridge trigger board 17, weak magnetic trigger board 13, skids and suppress read-out on trigger board 15 and the electric wheel truck by connecting terminal block, and for stable 24V direct current (DC) is provided with upper-part.Storage battery 19 on the electric wheel truck is connected with a plurality of dropout switch (not shown); be respectively applied for each circuit in break-make the utility model; when there is over-current phenomenon avoidance in circuit, dropout switch automatic cutout related circuit, thereby protection related circuit and device wherein.Storage battery 19 on the electric wheel truck also is electrically connected with each electropneumatic contactor and electromagnetic contactor.
The principle of work of the utility model major loop is: direction switch, Das Gaspedal and brake pedal in the driver control driver's cab, computer control device 1 is gathered the signal of direction switch, Das Gaspedal and brake pedal, and carry out logic operation, thereby judge the operating mode of electric wheel truck, send closed or open circuited control signal according to the electric wheel truck operating mode to electropneumatic contactor KM1～KM7 and electromagnetic contactor KM8, KM9 then.After each electropneumatic contactor and electromagnetic contactor are finished the command adapted thereto that computer control device 1 sends, the voltage that computer control device 1 is carried the microcomputer signal transmitting device that collects, current signal carries out computing, calculate virtual voltage, current value, computer control device 1 is according to virtual voltage, current value carries out the PI computing, calculate the angle that single-phase half-controlled rectifier bridge 16 thyristor need be opened, then by a single-phase half-controlled rectifier bridge trigger board 17, the size of the excitation winding electric current of the electrical generator of indirect control electric wheel truck, thus realization is to the traction or the control of braking of electric wheel truck.
In the foregoing description, computer control device 1 also carries out fault detection to electric wheel truck, when faults such as overvoltage, overcurrent, ground connection or motor overheating are arranged when electric wheel truck, computer control device 1 is with the time of record trouble generation and automobile parameter this moment, the read-out that the fault title is sent on the driver's cab operating console shows simultaneously, and fault is provided measures areput.
In the foregoing description, computer control device 1 also is sent to read-out with the voltage and current of the output voltage of the status information of each electropneumatic contactor and electromagnetic contactor, vehicle behavior, three- phase commutation bridge 3,4 and electric current, traction electric machine M1, M2 and cumulant information and shows, is convenient to the driver and in time grasps automobile operating state.Read-out is the color liquid crystal touch display screen, and the driver can carry out the failure record that automobile is checked in page turning by touch screen, operations such as deletion failure record.
In the various embodiments described above; the structure of each parts, the position is set and connects and all can change to some extent; on the basis of technical solutions of the utility model,, should not get rid of outside protection domain of the present utility model improvement and the equivalents that individual component is carried out.
Claims (6)
1, a kind of electric wheel truck electrical controller is characterized in that comprising: a major loop, and a generator excitation circuit, a weak magnetic control system circuit, one skids suppresses a protective circuit and a computer control device;
Described major loop comprises two groups of three-phase commutation bridges that connect the electric wheel truck electrical generator, and two brake circuits of each described three-phase commutation bridge and described electric wheel truck are connected in series, and are electrically connected described computer control device;
Described generator excitation circuit comprises that the single-phase half-controlled rectifier bridge, the capacitance-resistance that are connected in parallel by automatic switch absorb module and single-phase half-controlled rectifier bridge trigger board; Described generator excitation circuit is electrically connected described computer control device by described single-phase half-controlled rectifier bridge trigger board;
Described weak magnetic control system circuit, comprise three weak magnetocrystalline brake tube and weak magnetic diverters that are used for the weak magnetic control system of automobile, each described weak magnetocrystalline brake tube connects one of them input end of two described three-phase commutation bridges respectively, and being electrically connected described computer control device by a weak magnetic trigger board, the contact of the master shunter in described weak magnetic diverter and the described major loop and the excitation winding of two described traction electric machines is electrically connected;
The described inhibition protective circuit of skidding comprises the two inhibition thyristor of skidding, and two described skidding are suppressed thyristor and are connected in series described major loop, and suppresses trigger board by skidding and connect described computer control device;
Described computer control device is electrically connected described major loop by microcomputer signal transmitting device, and described computer control device carries out computing to voltage, the current signal of each circuit of collecting, and sends control command.
2, a kind of electric wheel truck electrical controller as claimed in claim 1, it is characterized in that: each brake circuit in the described major loop comprises a series connection branch road and is connected in parallel on the diode at described series arm two ends that described series arm comprises overcurrent relay, current sensor, traction electric machine, the braking resistor that is connected in series.
3, a kind of electric wheel truck electrical controller as claimed in claim 1, it is characterized in that: the positive terminal of the single-phase half-controlled rectifier bridge of described generator excitation circuit is in series with a resistance, this resistance contactless switch in parallel; The be connected in parallel storage battery of electric wheel truck of described single-phase half-controlled rectifier bridge two ends is connected with a resistance, a contactless switch and an anti-adverse current diode between one end of described storage battery and the negative pole end of described single-phase half-controlled rectifier bridge.
4, a kind of electric wheel truck electrical controller as claimed in claim 1 or 2, it is characterized in that: the braking resistor in the described brake circuit is respectively a slide rheostat and certain value resistance;
Described major loop also comprises the excitation winding of a master shunter and described two traction electric machines, be connected electrically in regular turn between the positive terminal of a fixed value resistance in the described brake circuit and a described three-phase commutation bridge, between described master shunter and the described excitation winding, be provided with the contactless switch that is used to control break-make between described excitation winding and the described three-phase commutation bridge.
5, a kind of electric wheel truck electrical controller as claimed in claim 1 is characterized in that: two contacts that skid the inhibition thyristor in the described inhibition protection loop of skidding connect the cursor slide contact of the slide rheostat in the described brake circuit.
6, a kind of electric wheel truck electrical controller as claimed in claim 4 is characterized in that: two contacts that skid the inhibition thyristor in the described inhibition protective circuit of skidding connect the cursor slide contact of the slide rheostat in the described brake circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201237762U CN201309426Y (en) | 2008-11-20 | 2008-11-20 | Electric control device for electric wheel car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201237762U CN201309426Y (en) | 2008-11-20 | 2008-11-20 | Electric control device for electric wheel car |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201309426Y true CN201309426Y (en) | 2009-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201237762U Expired - Fee Related CN201309426Y (en) | 2008-11-20 | 2008-11-20 | Electric control device for electric wheel car |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201309426Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102700452A (en) * | 2012-06-11 | 2012-10-03 | 湘电重型装备股份有限公司 | Wrecker with electric wheels |
| CN107054159A (en) * | 2017-05-04 | 2017-08-18 | 陈明福 | A kind of pure electric automobile wheel driving control system |
| CN112564556A (en) * | 2020-11-20 | 2021-03-26 | 江苏科技大学 | Demagnetizing and magnetic braking device and method based on three-phase current of brushless direct current motor |
-
2008
- 2008-11-20 CN CNU2008201237762U patent/CN201309426Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102700452A (en) * | 2012-06-11 | 2012-10-03 | 湘电重型装备股份有限公司 | Wrecker with electric wheels |
| CN107054159A (en) * | 2017-05-04 | 2017-08-18 | 陈明福 | A kind of pure electric automobile wheel driving control system |
| CN112564556A (en) * | 2020-11-20 | 2021-03-26 | 江苏科技大学 | Demagnetizing and magnetic braking device and method based on three-phase current of brushless direct current motor |
| CN112564556B (en) * | 2020-11-20 | 2023-05-23 | 固安萨牌电器设备有限公司 | Demagnetizing braking device and method based on three-phase current of brushless direct current motor |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090916 Termination date: 20161120 |