CN202395712U - Control circuit of double-chopped-wave switch reluctance motor - Google Patents
Control circuit of double-chopped-wave switch reluctance motor Download PDFInfo
- Publication number
- CN202395712U CN202395712U CN2011205456031U CN201120545603U CN202395712U CN 202395712 U CN202395712 U CN 202395712U CN 2011205456031 U CN2011205456031 U CN 2011205456031U CN 201120545603 U CN201120545603 U CN 201120545603U CN 202395712 U CN202395712 U CN 202395712U
- Authority
- CN
- China
- Prior art keywords
- signal
- circuit
- resistance
- output
- pulse width
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Images
Landscapes
- Control Of Electric Motors In General (AREA)
Abstract
The utility model discloses a control circuit of a double-chopped-wave switch reluctance motor, which comprises a microprocessor, a bidirectional open interval distinguishing circuit, an either-or data selector, a position signal detecting circuit, a two-input intersection gate, a power inverter, a current sampling circuit, an amplifying circuit, a digital-to-analogue conversion circuit and a delaying comparison circuit. The control circuit of the double-chopped-wave switch reluctance motor solves the problem that the current exceeds the chopped-wave upper limit due to the fact that the current-rise speed is too fast in a bidirectional open interval when a switch reluctance motor performs bidirectional starting.
Description
Technical field
The utility model belongs to Motor Control Field, particularly a kind of switched Reluctance Motor Control circuit.
Background technology
Switched reluctance machines is simple in structure firm, reliable operation, and efficient is high; Compare with traditional AC-DC speed-regulating system by its Switch reluctance motor driving system that constitutes, have many advantages, as: starting torque is big; Speed-regulating range width, control can conveniently realize four quadrant running flexibly; Have stronger regenerative braking ability, in the rotating speed of broadness and power bracket, all have high efficiency, help saving energy and reduce the cost; Can work in high rotating speed; But phase-deficient operation, fault-tolerant ability is strong etc.
Switched reluctance machines is owing to rotational voltage when starting is zero, so the phase current rising is very fast, needs controller in start-up course, electric current to be controlled.Traditional current control method all is to utilize the specialized hardware chopper circuit to realize copped wave control usually; Promptly in the power inverter of controller, carry out the sampling and the amplification of phase current signal behind the series current transducer, and utilize sluggish amplifying circuit to realize the control of phase current copped wave upper and lower bound.Hardware based chopper circuit has the advantage of high real-time, the limit of the copped wave of Control current accurately in heavy load starting and operation.But hard copped wave action can receive the influence of burr in the prime sampling amplifying signal; The phenomenon of mistake copped wave may take place, promptly do not reach the copped wave upper limit and switching tube mistake is closed at electric machine phase current, perhaps electric current reaches after the copped wave upper limit and the switching tube refusal is closed; The former can cause the switching tube switching frequency to increase than normal; And reducing output torque, the latter can cause electric machine phase current to exceed the tolerance range of switching tube, thereby the life-span of switching tube and the power consumption of system are impacted.Another kind of chopping way commonly used is software copped wave, promptly through the burr in the software filtering algorithm filtering prime sampling amplifying signal, more accurately judges phase current values, thereby realizes the control of copped wave accurately.But because running software needs the regular hour, so real-time is relatively poor, and when starting current rose rapidly, soft copped wave had little time to send off switch pipe signal and causes the excessive damage switching tube of electric current.
The utility model content
Utility model purpose: to the problem and shortage of above-mentioned prior art existence; The purpose of the utility model provides a kind of pair of copped wave limit switched Reluctance Motor Control circuit, solve switched reluctance machines when two-phase starts because electric current to open the interval rate of climb in two-phase too fast and the problem of electric current above the copped wave upper limit occur.
Technical scheme: for realizing above-mentioned utility model purpose; The technical scheme that the utility model adopts is an a kind of pair of copped wave limit switched Reluctance Motor Control circuit; Comprise that microprocessor (CPU), two-phase open interval judging circuit, 2 and select 1 data selector, position signalling testing circuit, two inputs and door, power inverter, current sampling circuit, amplifying circuit, D/A converting circuit (DAC) and hysteresis comparator circuit; Wherein the position signalling testing circuit detects each phase position signal message of motor and each phase position signal message is flowed to two-phase and opens interval judging circuit, gives 2 to select coming in high copped wave limited pulse width modulating reference signal that 1 data selector selects to be exported by microprocessor and the low copped wave limited pulse width modulating reference signal to export to the input of D/A converting circuit based on differentiating output pulse width modulating reference signal gating signal as a result; Current sampling circuit is measured each phase current of motor; Through exporting to the input of hysteresis comparator circuit after the amplifying circuit amplification, the reference voltage of exporting with D/A converting circuit compares, the output chopping signal; Chopping signal and the input of the pulse width modulated drive signal of exporting by microprocessor as two inputs and door; The last switching tube of exporting to power inverter of two inputs and door as last switch controlled signal, thereby is realized the two copped waves limit control to switched reluctance machines.
Said microprocessor can comprise pulse-width modulation (PWM) module and input and output (IO) module; Wherein input/output module is exported switching tube commutation signal down to power inverter; Pulse width modulation module is to two inputs and a door output pulse width modulated drive signal, and selects the data input pin of 1 data selector to export high copped wave limited pulse width modulating reference signal and low copped wave limited pulse width modulating reference signal to 2;
Said position signalling testing circuit can comprise primary importance signal transducer, second place signal transducer and three position singal transducer, and the three-phase position signal information of detection motor is also exported to two-phase with three-phase position signal and opened interval judging circuit;
Said two-phase is opened interval judging circuit can comprise first XOR gate and second XOR gate; Wherein first XOR gate is input as A phase position signal and B phase position signal; The output of first XOR gate and C phase position signal be as the input of second XOR gate, the second XOR gate output pulse width modulating reference signal gating signal to 2 select 1 data selector the channel selecting end;
Said 2 select the data input pin of 1 data selector can insert high copped wave limited pulse width modulating reference signal and low copped wave limited pulse width modulating reference signal by the pulse width modulation module output of microprocessor; Channel selecting termination two-phase is opened the pulse-width modulation reference signal gating signal of interval judging circuit output, the input of output termination D/A converting circuit;
Said power inverter can comprise switching tube (being called for short " going up pipe ") and following switching tube (being called for short " pipe down "); The grid of last switching tube inserts by the last switch controlled signal of two inputs with door output, and the grid of following switching tube inserts the following switching tube commutation signal by microprocessor output;
Said two inputs and door can be imported from the pulse width modulated drive signal of microprocessor with from the chopping signal of hysteresis comparator circuit, go up the switch controlled signal to power inverter output;
Said current sampling circuit can comprise first resistance, and an end of said first resistance connects the source electrode of the following switching tube in the power inverter, other end ground connection (GND);
Said amplifying circuit can comprise second resistance, the 3rd resistance and first operational amplifier; Wherein an end of first resistance in the anode of first operational amplifier and the current sampling circuit and down the source electrode of switching tube link to each other; The negative terminal of first operational amplifier links to each other with the tie point of second resistance with the 3rd resistance; Form the sampling amplifying signal after the other end ground connection of second resistance, the output of first operational amplifier link to each other with the other end of the 3rd resistance, and export to hysteresis comparator circuit;
Said D/A converting circuit can comprise the 4th resistance, first electric capacity and second operational amplifier; Wherein the anode of second operational amplifier links to each other with the junction of the 4th resistance with first electric capacity; The other end of first electric capacity links to each other with ground; The other end of the 4th resistance connects the pulse-width modulation reference signal of selecting the output of 1 data selector from 2, the negative terminal of second operational amplifier back formation reference voltage that links to each other with himself output, and export to hysteresis comparator circuit;
Said hysteresis comparator circuit can comprise the 5th resistance, the 6th resistance and comparator; The anode of said comparator links to each other with the junction of the 5th resistance with the 6th resistance; The negative terminal of comparator connects the sampling amplifying signal, and the other end of the 5th resistance is connected with reference voltage, and the output of comparator is with after the other end of the 6th resistance links to each other; Form chopping signal, and to two inputs and door output.
Said first resistance can be sampling resistor.Said sampling resistor preferably adopts the constantan wire of high accuracy low-temperature coefficient conductive metallic material preparation.
Beneficial effect: the utility model can be realized realizing two copped wave limits when switched reluctance machines uses hardware copped wave when two-phase starts; In the single-phase high copped wave limit of interval use of opening; Limit the delay that reduces the pulse-width modulation configuration and open the low copped wave of interval use, and improved the electric current utilization ratio in two-phase.Both, can bigger detent torque be provided constantly in startup again for the switched reluctance machines speed-adjusting and control system provides important efficient and safety guarantee.Have principle and circuit is simple, be easy to realize, working stability, and advantage such as with low cost.
Description of drawings
Fig. 1 is the structured flowchart of two copped wave limit switched Reluctance Motor Control circuit;
Fig. 2 is the cut-away view of two copped wave limit switched Reluctance Motor Control circuit;
Fig. 3 is the Current Control waveform sketch map of two copped wave limit switched Reluctance Motor Control circuit, and A, B, C represent A phase, B phase, the C phase of two copped wave limit switched reluctance machines among the figure;
Fig. 4 is the A phase current waveform of two copped wave limit switched reluctance machines when work.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment; Further illustrate the utility model; Should understand these embodiment only be used to the utility model is described and be not used in the restriction the utility model scope; After having read the utility model, those skilled in the art all fall within the application's accompanying claims institute restricted portion to the modification of the various equivalent form of values of the utility model.
As shown in Figure 1, position signalling testing circuit outgoing position signal is opened interval judging circuit to two-phase, and according to differentiating the reference voltage that the result selects high and low copped wave limit; Simultaneously; Through exporting to the input of hysteresis comparator circuit after the amplifying circuit amplification, compare the output chopping signal with reference voltage behind each phase current of current sampling circuit measurement motor; Chopping signal is with the input of the pulse-width signal of being exported by microprocessor as two inputs and door; Two inputs are managed with the going up of power inverter of exporting to of door, as last management and control system signal, thereby realize the two copped wave limit control to switched reluctance machines.
As shown in Figure 2; Position signalling testing circuit 4 detects each phase position signal message of motors and each phase position signal message is flowed to two-phase opens interval judging circuit 2, gives 2 to select coming in high copped wave limited pulse width modulating reference signal that 1 data selector 3 selects to be exported by microprocessor 1 and the low copped wave limited pulse width modulating reference signal to export to the input of D/A converting circuit 9 according to differentiating output pulse width modulating reference signal gating signal as a result; Simultaneously; Current sampling circuit 7 is measured each phase current of motor; Through exporting to the input of hysteresis comparator circuit 10 after amplifying circuit 8 amplifications, the reference voltage of exporting with D/A converting circuit 9 compares, the output chopping signal; Chopping signal and the input of the pulse width modulated drive signal of exporting by microprocessor 1 as two inputs and door 5; The last switching tube of exporting to power inverter 6 of two inputs and door 5 as last switch controlled signal, thereby is realized the two copped waves limit control to switched reluctance machines.
Introduce the practical implementation application scheme of the utility model below.
Be to solve the not enough problem of threephase switch reluctance motor detent torque, it is open-minded in the electric motor starting process, need to carry out two-phase, owing to open the interval in two-phase, the moment that electric current provides is less, therefore, can limit and raises the efficiency through reducing current chopping.The mode of specifically opening that two-phase starts is as shown in Figure 3.Low level among the figure is the interval of opening of each phase; Then A, B, C three-phase position signal be 011,101,110 o'clock be the single-phase interval of opening; At 001,010,100 o'clock was that two-phase is opened the interval, and wherein 0 to represent position signalling be low level, and 1 to represent position signalling be high level.
Shown in Figure 4 is the phase current waveform of two copped wave limit switched reluctance machines when work.With A is example mutually, and during startup, A, B, C three-phase position signal were in 001 state when A had just opened mutually; For two-phase is opened the interval; Two-phase is opened interval judging circuit output judgment signal, selects low copped wave limited pulse width modulating reference signal, exports to D/A converting circuit and produces reference voltage; A, B, C three-phase position signal are in 011 state when A has just opened mutually, and for two-phase is opened the interval, two-phase is opened interval judging circuit output judgment signal, selects high copped wave limited pulse width modulating reference signal, exports to D/A converting circuit and produces reference voltage; A, B, C three-phase position signal were in 010 state when A had just opened mutually, and for two-phase is opened the interval, two-phase is opened interval judging circuit output judgment signal, selects low copped wave limited pulse width modulating reference signal, exports to D/A converting circuit and produces reference voltage.
Introduce the detailed composition of two copped wave limit switched Reluctance Motor Control circuit below.
As shown in Figure 2; Microprocessor comprises pulse width modulation module 11 and input/output module 12; Wherein input/output module is exported switching tube commutation signal down to power inverter; Pulse width modulation module is to two inputs and a door output pulse width modulated drive signal, and selects the first data input pin I1 of 1 data selector and the second data input pin I2 to export high copped wave limited pulse width modulating reference signal and low copped wave limited pulse width modulating reference signal respectively to 2;
The position signalling testing circuit comprises primary importance signal transducer 41, second place signal transducer 42 and three position singal transducer 43, and the three-phase position signal information of detection motor is also exported to two-phase with three-phase position signal and opened interval judging circuit;
Two-phase is opened interval judging circuit and is comprised first XOR gate 21 and second XOR gate 22; Wherein first XOR gate is input as A phase position signal and B phase position signal; The output of first XOR gate and C phase position signal be as the input of second XOR gate, the second XOR gate output pulse width modulating reference signal gating signal to 2 select 1 data selector channel selecting end S;
2 select the first data input pin I1 of 1 data selector and the second data input pin I2 to insert high copped wave limited pulse width modulating reference signal and low copped wave limited pulse width modulating reference signal by the pulse width modulation module output of microprocessor respectively; Channel selecting end S connects the pulse-width modulation reference signal gating signal that two-phase is opened interval judging circuit output, and output Y connects the input of D/A converting circuit;
The hardware chopper circuit comprises two inputs and door 5, power inverter 6, current sampling circuit 7, amplifying circuit 8, D/A converting circuit 9 and hysteresis comparator circuit 10;
Power inverter comprises switch transistor T 1 and following switch transistor T 2, and the grid of last switching tube inserts by the last switch controlled signal of two inputs with door output, and the grid of following switching tube inserts the following switching tube commutation signal by microprocessor output; The source electrode of last switching tube connects+the 48V power power-supply, connects the source electrode of switching tube down after certain phase motor windings of drain electrode series connection; The grounded drain GND of following switching tube;
Two inputs and door input are gone up the switch controlled signal from the pulse width modulated drive signal of microprocessor with from the chopping signal of hysteresis comparator circuit to power inverter output;
Current sampling circuit comprises that an end of first resistance R, 1, the first resistance of constantan wire material connects the source electrode of the following switching tube in the power inverter, other end ground connection GND;
Amplifying circuit comprises second resistance R 2, the 3rd resistance R 3 and first operational amplifier 81; Wherein an end of first resistance in the anode of first operational amplifier and the current sampling circuit and down the source electrode of switching tube link to each other; The negative terminal of first operational amplifier links to each other with the tie point of second resistance with the 3rd resistance; Form the sampling amplifying signal after the other end ground connection of second resistance, the output of first operational amplifier link to each other with the other end of the 3rd resistance, and export to hysteresis comparator circuit;
D/A converting circuit comprises the 4th resistance R 4, first capacitor C 1 and second operational amplifier 91; Wherein the anode of second operational amplifier links to each other with the junction of the 4th resistance with first electric capacity; The other end of first electric capacity links to each other with ground; The other end of the 4th resistance connects the pulse-width modulation reference signal of selecting the output of 1 data selector from 2, the negative terminal of second operational amplifier back formation reference voltage that links to each other with himself output, and export to hysteresis comparator circuit;
Hysteresis comparator circuit comprises the 5th resistance R 5, the 6th resistance R 6 and comparator 101; The anode of comparator links to each other with the junction of the 5th resistance with the 6th resistance; The negative terminal of comparator connects the sampling amplifying signal, and the other end of the 5th resistance is connected with reference voltage, and the output of comparator is with after the other end of the 6th resistance links to each other; Form chopping signal, and to two inputs and door output.
Claims (4)
1. the switched Reluctance Motor Control circuit is limit in two copped waves; It is characterized in that: comprise that microprocessor, two-phase open interval judging circuit, 2 and select 1 data selector, position signalling testing circuit, two inputs and door, power inverter, current sampling circuit, amplifying circuit, D/A converting circuit and hysteresis comparator circuit; Wherein the position signalling testing circuit detects each phase position signal message of motor and each phase position signal message is flowed to two-phase and opens interval judging circuit, gives 2 to select coming in high copped wave limited pulse width modulating reference signal that 1 data selector selects to be exported by microprocessor and the low copped wave limited pulse width modulating reference signal to export to the input of D/A converting circuit based on differentiating output pulse width modulating reference signal gating signal as a result; Current sampling circuit is measured each phase current of motor; Through exporting to the input of hysteresis comparator circuit after the amplifying circuit amplification; The reference voltage of exporting with D/A converting circuit compares, output chopping signal, chopping signal and the input of the pulse width modulated drive signal of being exported by microprocessor as two inputs and door; The last switching tube of exporting to power inverter of two inputs and door is as last switch controlled signal.
2. according to said pair of copped wave limit of claim 1 switched Reluctance Motor Control circuit, it is characterized in that:
Said microprocessor comprises pulse width modulation module and input/output module; Wherein input/output module is exported switching tube commutation signal down to power inverter; Pulse width modulation module is to two inputs and a door output pulse width modulated drive signal, and selects the data input pin of 1 data selector to export high copped wave limited pulse width modulating reference signal and low copped wave limited pulse width modulating reference signal to 2;
Said position signalling testing circuit comprises primary importance signal transducer, second place signal transducer and three position singal transducer, and the three-phase position signal information of detection motor is also exported to two-phase with three-phase position signal and opened interval judging circuit;
Said two-phase is opened interval judging circuit and is comprised first XOR gate and second XOR gate; Wherein first XOR gate is input as A phase position signal and B phase position signal; The output of first XOR gate and C phase position signal be as the input of second XOR gate, the second XOR gate output pulse width modulating reference signal gating signal to 2 select 1 data selector the channel selecting end;
Said 2 select the data input pin of 1 data selector to insert high copped wave limited pulse width modulating reference signal and low copped wave limited pulse width modulating reference signal by the pulse width modulation module output of microprocessor; Channel selecting termination two-phase is opened the pulse-width modulation reference signal gating signal of interval judging circuit output, the input of output termination D/A converting circuit;
Said power inverter comprises switching tube and following switching tube, and the grid of last switching tube inserts by the last switch controlled signal of two inputs with door output, and the grid of following switching tube inserts the following switching tube commutation signal by microprocessor output;
Said two inputs and door input are gone up the switch controlled signal from the pulse width modulated drive signal of microprocessor with from the chopping signal of hysteresis comparator circuit to power inverter output;
Said current sampling circuit comprises first resistance, and an end of said first resistance connects the source electrode of the following switching tube in the power inverter, other end ground connection;
Said amplifying circuit comprises second resistance, the 3rd resistance and first operational amplifier; Wherein an end of first resistance in the anode of first operational amplifier and the current sampling circuit and down the source electrode of switching tube link to each other; The negative terminal of first operational amplifier links to each other with the tie point of second resistance with the 3rd resistance; Form the sampling amplifying signal after the other end ground connection of second resistance, the output of first operational amplifier link to each other with the other end of the 3rd resistance, and export to hysteresis comparator circuit;
Said D/A converting circuit comprises the 4th resistance, first electric capacity and second operational amplifier; Wherein the anode of second operational amplifier links to each other with the junction of the 4th resistance with first electric capacity; The other end of first electric capacity links to each other with ground; The other end of the 4th resistance connects the pulse-width modulation reference signal of selecting the output of 1 data selector from 2, the negative terminal of second operational amplifier back formation reference voltage that links to each other with himself output, and export to hysteresis comparator circuit;
Said hysteresis comparator circuit comprises the 5th resistance, the 6th resistance and comparator; The anode of said comparator links to each other with the junction of the 5th resistance with the 6th resistance; The negative terminal of comparator connects the sampling amplifying signal, and the other end of the 5th resistance is connected with reference voltage, and the output of comparator is with after the other end of the 6th resistance links to each other; Form chopping signal, and to two inputs and door output.
3. according to said pair of copped wave limit of claim 2 switched Reluctance Motor Control circuit, it is characterized in that: said first resistance is sampling resistor.
4. according to said pair of copped wave limit of claim 3 switched Reluctance Motor Control circuit, it is characterized in that: the material of said sampling resistor is a constantan wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205456031U CN202395712U (en) | 2011-12-23 | 2011-12-23 | Control circuit of double-chopped-wave switch reluctance motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205456031U CN202395712U (en) | 2011-12-23 | 2011-12-23 | Control circuit of double-chopped-wave switch reluctance motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202395712U true CN202395712U (en) | 2012-08-22 |
Family
ID=46670611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205456031U Withdrawn - After Issue CN202395712U (en) | 2011-12-23 | 2011-12-23 | Control circuit of double-chopped-wave switch reluctance motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202395712U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412773A (en) * | 2011-12-23 | 2012-04-11 | 东南大学 | Control circuit of switched reluctance motor with double chopped wave limits |
-
2011
- 2011-12-23 CN CN2011205456031U patent/CN202395712U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412773A (en) * | 2011-12-23 | 2012-04-11 | 东南大学 | Control circuit of switched reluctance motor with double chopped wave limits |
| CN102412773B (en) * | 2011-12-23 | 2013-07-10 | 东南大学 | Control circuit of switched reluctance motor with double chopped wave limits |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102412773B (en) | Control circuit of switched reluctance motor with double chopped wave limits | |
| CN201383787Y (en) | Controller of brushless direct current motor | |
| CN101841292B (en) | Direct-current motor driver of wind generating variable-propeller control system | |
| CN103138674B (en) | High-power brushless double-fed motor variable frequency speed control system and control method | |
| CN103434415A (en) | Motor vehicle driving system | |
| CN203278723U (en) | Controller for brushless direct current motor | |
| CN202721450U (en) | Fully controllable energy feedback device | |
| CN201708754U (en) | DC motor driver of wind power generation active pitch control system | |
| CN102299673B (en) | Cooperative chopped wave starting circuit and method for switched reluctance motor | |
| CN205051611U (en) | Motor drive system that restraines switched reluctance motor torque ripple | |
| CN103944439B (en) | The two motor cascaded multi-level inverse conversion systems without Active Front End | |
| CN2907030Y (en) | Low-harmonic variable-frequency speed regulator with reactive power compensation function | |
| CN115465785A (en) | Intelligent speed regulating system for operation of tower crane | |
| CN202121543U (en) | AC motor driving device with vector control used in variable-pitch control system | |
| CN102290807B (en) | Small-sized wind power generation controller with wide voltage input range | |
| CN201708756U (en) | Driving device of series excited DC motor of variable paddle control system | |
| CN105743415A (en) | Variable-number parallel electromobile converter considering actual operating condition | |
| CN103684130A (en) | PWM (pulse-width modulation) voltage regulation control method of direct instantaneous torque of switched reluctance motor | |
| CN202395712U (en) | Control circuit of double-chopped-wave switch reluctance motor | |
| CN101119088A (en) | Whole controlled energy feedback system | |
| CN102832871A (en) | Vector control based driving device of alternating current motor for pitch control system | |
| CN202633913U (en) | Fork lock protection circuit based on insulated gate bipolar transistor (IGBT) half bridge gate drive | |
| CN110120762B (en) | Error-free switched reluctance motor current control method | |
| CN208539815U (en) | Ultrahigh speed spindle controller based on GaN power device | |
| CN103441713B (en) | Method for adjusting switch-on angle and switch-off angle of switched reluctance motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120822 Effective date of abandoning: 20130710 |
|
| RGAV | Abandon patent right to avoid regrant |