CN104993747A - 12/8 pole three-phase switched reluctance motor hybrid excitation current control method - Google Patents
12/8 pole three-phase switched reluctance motor hybrid excitation current control method Download PDFInfo
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Abstract
A 12/8 pole three-phase switched reluctance motor hybrid excitation current control method is characterized in that the conduction cycle of each phase winding is increased from a 1/3 rotor angle cycle of 15 degrees, by a 1/6 rotor angle cycle of 7.5 degrees, to a 1/2 rotor angle cycle of 22.5 degrees. In the 1/6 rotor angle cycle of the extended conduction of each phase winding, the energizing mode of each winding is changed from original positive voltage chopping waves to zero voltage subsequent current, and thus single-and-double-phase hybrid excitation control is realized. By adopting the control method of zero voltage subsequent current for the 1/6 rotor angle cycle of the extended conduction of each phase winding, winding current in an inductance rise zone decreases slowly and generated electromagnetic torque compensates for the insufficient electromagnetic torque of a current build-up process of the next winding. Therefore, the torque pulsation caused by sudden torque change in the winding phase change process is prevented, the total electromagnetic torque of a motor is increased and the loading capacity of the motor is improved.
Description
Technical field
The present invention relates to the composite excitation control method of 12/8 pole threephase switch reluctance motor, the current control method of winding afterflow under especially a kind of composite excitation mode.
Background technology
Existing switched reluctance machines (switched reluctance motor, SRM) compares with traditional AC/DC motor, and its structure is simple, firmly, rotor is salient-pole structure.On rotor with salient pole both without winding also without permanent magnet, stator salient poles is wound with central excitation winding.Switched reluctance machines is when low cruise, and winding just can produce larger electromagnetic torque by less electric current, and this feature makes it be applicable to the occasion of frequent start-stop, rotating.
The excitation mode of existing switched reluctance machines is often single-phase excitation, and for 12/8 pole three-phase switch reluctance machine, a rotor polar moment angle cycle is 45 °, and every phase winding turn-on cycle under single-phase excitation mode is 15 °.When switched reluctance machines starting or low cruise, under single-phase excitation mode, identical starting current just can produce the starting torque larger than AC/DC motor.But in some industrial applications, sometimes need drive system to start under larger loading condition, when switched reluctance machines operates in single-phase excitation mode, the electromagnetic torque of output is still not enough to make motor normal starting.In this case, a lot of industrial occasions often adopts the installed capacity increasing drive system to meet starting performance requirement, and after electric motor starting completes, system is normally run does not need so large capacity, there is low load with strong power phenomenon, system effectiveness is declined; On the other hand, due to the commutation mode that switched reluctance machines is special, make motor in commutation moment, there is the situation of torque sudden change, cause the problem that torque pulsation is serious, have impact on switched reluctance machines applying in industrial occasions.
Summary of the invention
The object of this invention is to provide a kind of single bipolar mixture excitation mode control method of 12/8 pole three-phase switch reluctance machine, especially the current control method in composite excitation process, be improved to making the performance of motor in load capacity and torque pulsation, some need heavy-load start, the application in frequent start-stop, rotating field in colliery industry, textile industry, oil exploitation etc. to realize switched reluctance machines.
Above-mentioned purpose of the present invention is achieved through the following technical solutions.
A kind of 12/8 pole threephase switch reluctance motor composite excitation current control method, method described in it is the turn-on cycle of every phase winding was extended to 1/2 rotor angle cycle by 15 ° of 1/3 rotor angle cycle 22.5 °, described 22.5 ° is three phases: every phase winding is at first 7.5 ° of conducting, last phase winding is in Zero pressure continuous stream mode, and the conducting simultaneously of two phase windings is the two-phase excitation stage; 7.5 °, the centre of every phase winding conducting only has this phase winding conducting, is the single-phase excitation stage; Latter 7.5 ° of every phase winding conducting, start zero-pressure afterflow, and next phase winding starts energising, and the conducting simultaneously of two phase windings is the two-phase excitation stage, realizes single bipolar mixture excitation con-trol.
The switched reluctance machines power conversion circuit of foregoing invention is asymmetrical half-bridge type circuit.Every phase winding is controlled by upper and lower two switching devices, each switching device inverse parallel diode.Opening and shutoff of two main switching devices be connected with each phase winding by control, every phase winding has: malleation, zero-pressure, back-pressure three kinds of states, the computing formula according to torque:
can be drawn a conclusion: when motor operates in motoring condition, for increasing the electromagnetic torque that motor exports, each phase winding electric current of motor should be made before its inductance rises to reach higher value, before inductance starts to decline, reducing to zero.Traditional switched reluctance machines winding conduction mode is: when rotor groove center axis aligns with stator salient poles central axis (being defined as 0 °), phase winding inductance is minimum, open the main switching device be connected with phase winding, winding current rises very fast, set-point was reached before inductance rises, after rotor turns over a step angle (15 °), turn off the main switching device be connected with phase winding, now winding phase inductance is still in rising area, and winding current declines very fast.In winding conducting phase, chop control is carried out to winding current.The current control method that this patent proposes is the same with traditional control method when main switching device is opened, after rotor turns over a step angle, because phase winding inductance is still in rising area, so this patent is after rotor turns over a step angle, the method of zero-pressure afterflow is adopted to control winding current, make winding current decrease speed slack-off, continue to produce forward electromagnetic torque in this stage.When rotor turns over 7.5 ° again, phase winding inductance reaches maximum substantially, turns off the main switching device be connected with winding, and winding current is declined rapidly, before inductance declines, reduce to zero, avoids producing negative sense electromagnetic torque.
On the one hand, by every phase winding many conducting 1/6 rotor angle cycles, the winding current being in inductance rising area is slowly declined, the electromagnetic torque of generation can compensate the deficiency of electromagnetic torque in next phase winding electric current process of establishing, avoid in winding commutation process, torque suddenlys change the torque pulsation caused; On the other hand, ignore the impact of mutual inductance between winding, think that total electromagnetic torque is the algebraical sum of each phase electromagnetic torque, adopt zero-pressure afterflow to make the electromagnetic torque produced between the slow decrement phase of winding current add total electromagnetic torque of motor to a certain extent, improve the load capacity of motor.
Accompanying drawing explanation
Fig. 1 is the present invention 12/8 pole switching reluctance electric machine rotor structural representation.
Fig. 2 is asymmetrical half-bridge type power conversion circuit of the present invention.
Fig. 3 is the malleation operating state of SRM of the present invention.
Fig. 4 is the zero-pressure operating state of SRM of the present invention.
Fig. 5 is the back-pressure operating state of SRM of the present invention.
Fig. 6 is the corresponding relation of switched reluctance machines phase inductance under boresight shift of the present invention and rotor relative position.
Fig. 7 is electric current and phase inductance relative position relation under list bipolar mixture excitation mode of the present invention.
Embodiment
Below the specific embodiment of the present invention is made further instructions.
For 12/8 pole switching reluctance motor, on stator four salient pole windings diametrically by two strings two and type of attachment form a phase, as shown in Figure 1, total three-phase.
As shown in Figure 2, adopt asymmetrical half-bridge type main circuit as the power conversion circuit of Switched Reluctance Motor, every phase winding is controlled by upper and lower two IGBT, the upper inverse parallel of IGBT has fast recovery diode, by controlling two IGBT with windings in series, every phase winding has three kinds of different operating states.When upper and lower two IGBT all open, winding is operated in barotropic state, flows through the sense of current of winding as shown in Figure 3; When upper and lower two IGBT only have one to open, winding is operated in zero-pressure state, flows through the electric current of winding as shown in Figure 4; When upper and lower two IGBT all turn off, winding is operated in back-pressure state, flows through the electric current of winding as shown in Figure 5.
Conveniently, definition stator salient poles central axis as shown in Figure 4 and rotor recesses central axis aligned position are 0 °, according to step angle and rotor polar moment angle computing formula, the step angle of 12/8 pole switching reluctance motor and rotor polar moment angle are 15 ° of (θ respectively
3) and 45 ° of (θ
9).When rotor forwards 0 ° of position to, to winding energising, make winding current (θ before phase inductance starts rising
2) reach set-point, after electric current reaches set-point, start to carry out chop control to winding current, make winding current be stabilized near set-point, (θ after rotor turns over a step angle
3), on the one hand because now phase inductance is still in rising area, exporting electromagnetic torque to increase motor, still needing to keep certain current value; On the other hand, in order to make winding current reduce to zero before inductance starts decline, current value can not be too large.Therefore, when rotor is positioned at θ
3during position, two IGBT be connected with energized phase winding are turned off one, adopt the mode of zero-pressure afterflow to control winding current, winding current is slowly declined, when rotor turns over 7.5 ° of (θ again
4), phase inductance reaches maximum, and the electromagnetic torque of generation is zero substantially, is controlled, make winding current drop to zero very soon by back-pressure afterflow mode to winding.
As the above analysis, the conducting interval of every phase winding is 0 ° of-22.5 ° of (θ
4), in this interval, in the existing single-phase winding excitation stage, also there is the two-phase winding excitation stage.Therefore, this kind of control method is single bipolar mixture excitation control method.
Claims (2)
1.12/8 pole threephase switch reluctance motor composite excitation current control method, method described in it is the 7.5o turn-on cycle of every phase winding being extended 1/6 rotor angle cycle by the 15o in 1/3 rotor angle cycle, reaches the 22.5o in 1/2 rotor angle cycle; Within the 1/6 rotor angle cycle that every phase winding extends conducting, make winding step mode become zero-pressure afterflow from original malleation copped wave, realize single bipolar mixture excitation con-trol.
2. the method for claim 1, method described in it is the conducting interval of every phase winding is 0o-22.5o, described 22.5o is three phases: every phase winding 7.5o before conducting, and last phase winding is in Zero pressure continuous stream mode, and the conducting simultaneously of two phase windings is the two-phase excitation stage; The middle 7.5o of every phase winding conducting, only has a phase winding conducting to be the single-phase excitation stage; The rear 7.5o of every phase winding conducting, starts zero-pressure afterflow, and next phase winding starts energising, and the conducting simultaneously of two phase windings is the two-phase excitation stage, realizes single bipolar mixture excitation con-trol.
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Cited By (6)
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|---|---|---|---|---|
| CN106849771A (en) * | 2017-03-29 | 2017-06-13 | 太原理工大学 | A kind of single two-phase excitation control method of switched reluctance machines high speed |
| CN107026550A (en) * | 2017-05-19 | 2017-08-08 | 北京航空航天大学 | A kind of Hybrid Excitation Switched Reluctance Motor |
| CN107332222A (en) * | 2017-07-28 | 2017-11-07 | 尹向阳 | One kind is applied to powerful dc switch arc-control device |
| CN108683381A (en) * | 2018-04-04 | 2018-10-19 | 捷和电机制品(深圳)有限公司 | A kind of motor and its drive control circuit |
| CN114553079A (en) * | 2022-04-27 | 2022-05-27 | 太原理工大学 | Voltage-adjustable switched reluctance generator power converter and control method thereof |
| CN115425884A (en) * | 2022-11-03 | 2022-12-02 | 南京师范大学 | Torque suppression method for excitation current sectional compensation of doubly salient electro-magnetic motor |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849771A (en) * | 2017-03-29 | 2017-06-13 | 太原理工大学 | A kind of single two-phase excitation control method of switched reluctance machines high speed |
| CN107026550A (en) * | 2017-05-19 | 2017-08-08 | 北京航空航天大学 | A kind of Hybrid Excitation Switched Reluctance Motor |
| CN107026550B (en) * | 2017-05-19 | 2019-07-02 | 北京航空航天大学 | A kind of Hybrid Excitation Switched Reluctance Motor |
| CN107332222A (en) * | 2017-07-28 | 2017-11-07 | 尹向阳 | One kind is applied to powerful dc switch arc-control device |
| WO2019019602A1 (en) * | 2017-07-28 | 2019-01-31 | 广州金升阳科技有限公司 | Direct current switch arc-extinguishing device suitable for high power |
| CN107332222B (en) * | 2017-07-28 | 2020-09-15 | 尹向阳 | Direct current switch arc extinguishing device suitable for high power |
| CN108683381A (en) * | 2018-04-04 | 2018-10-19 | 捷和电机制品(深圳)有限公司 | A kind of motor and its drive control circuit |
| CN108683381B (en) * | 2018-04-04 | 2024-04-05 | 捷和电机制品(深圳)有限公司 | Motor and drive control circuit thereof |
| CN114553079A (en) * | 2022-04-27 | 2022-05-27 | 太原理工大学 | Voltage-adjustable switched reluctance generator power converter and control method thereof |
| CN114553079B (en) * | 2022-04-27 | 2022-07-05 | 太原理工大学 | Voltage-adjustable switched reluctance generator power converter and control method thereof |
| CN115425884A (en) * | 2022-11-03 | 2022-12-02 | 南京师范大学 | Torque suppression method for excitation current sectional compensation of doubly salient electro-magnetic motor |
| CN115425884B (en) * | 2022-11-03 | 2023-01-17 | 南京师范大学 | Torque suppression method for segmented compensation of excitation current of electro-magnetic doubly salient motor |
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