6th Internatonal Conerence on Avance Desgn an Manuacturng Engneerng (ICADME 16) Flux-enng Control Research or Interor Permanent Magnet Synchronous Motor n Electrc Vehcle L Ln1,a, Yong-kuang L,b, Ha-yan Zhao3,c an Shu- Sh4, 1 3 4 a lnlexn@163.com, b381837@.com, c117437@.com, 3896354@.com Keywors: electrc tracton;nteror permanent magnet synchronous motor;flux-enng Abstract: In orer to mprove the vehcle spee range o the nteror permanent magnet synchronous motor, the lux weakenng control strategy s stue n ths artcle. The nteror permanent magnet synchronous motor el weakenng control system smulaton moel s establshe base on the platorm o MATLAB/Smulnk, an hgh spee weak control system smulaton s carre out. The smulaton results show that the system has a we range o spee regulaton, an these prove a reerence sgncance or urther stuy on the hgh-spee cruse an overtakng an other contons. Introucton Interor Permanent Magnet Synchronous Motor (IPMSM) ue to ts hgh torue power ensty, hgh power actor, we constant power spee range avantages n electrc vehcles, wn power, ral tracton, electrc spnle an other els has been wely use [1-3]. Electrc vehcle rve system can realze constant torue control at low spee,an can acheve we constant power spee at hgh spee. In aton, n the hgh spee tracton ral transportaton, vgorously pursue the IPMSM system we constant power spee, n orer to acheve the spee upgrae, thereore, n electrc tracton, the nteror permanent magnet synchronous motor or weak control, enhance the spee range o IPMSM, whch has an mportant sgncance [4-5]. In ths paper, the nteror permanent magnet motor el weakenng control strategy s stue; Wth the MATLAB/Smulnk smulaton platorm, the smulaton moel o IPMSM weak control system or vehcle s bult, the smulaton results show that the system has a we range o spee regulaton, an proves some reerence or the urther research on hgh spee cruse an overtakng conton. - axs mathematcal moel o IPMSM In orer to smply the analyss, the rotor s assume to have no ampng wnng, that s, the ampng wnng has no ampng eect on the permanent magnet o the motor; the stator ar gap strbuton s unorm; the counter electromotve orce waveorm s snusoal; the core o the motor s neglecte, an the ey current an the hysteress loss o the motor are neglecte. Uner these assumptons, the mathematcal moel o the - axs o IPMSM s: Voltage euaton: L Ln 197.1- male, Proessor, octor, master's tutor, manly engage n power electroncs an power transmsson, new energy electrc vehcles an wn power an other aspects o teachng an research work. Fun project: Hunan provncal scence an technology epartment key research an evelopment project (project number: 15GK333); Stuy on the teachng reorm project o Hunan Provnce n 15 the ornary hgher school: "Research on ral trac sgnal control an proessonal knowlege structure an currculum system" (Hunan general textbook 15 No. 91). In 9 n Hunan Provnce Department o eucaton scence research project (project number: 9C884); Shaoyang cty n 15 the scentc project (gas hot water boler control system key technology research an applcaton); project supporte by the scence an technology project o Hunan provnce (No. 15GK33). Shaoyang Unversty grauate stuent research an nnovaton project (project number: Cx15SY18). 16. The authors - Publshe by Atlants Press 466
Torue euaton: Moton euaton: In the euaton,, u u, u R s + L - w L t u R s + L + w L + wy t (1) Te p( y y ) p[ y + ( L L ) ] () T e J w w T + + F p t p y L (3) y, L L respectvely s the - axs o the stator current, voltage, lux an nuctance components; ψ s a lux lnkage prouce by permanent magnet; R s the stator phase wnng resstance; w s the electrc motor spee; p s the pole s pars; T e T L F J respectvely s motor electro torue, loa torue, vscous rcton coecent an moment o nerta. IPMSM weak control strategy The rotor exctng el o IPMSM s prouce by permanent magnet, by ncreasng stator current an rect axs armature reacton to weaken the motor ar gap el, to acheve the "weak " eect, an the termnal voltage an stator current are restrcte by the output o the nverter, n the - axs coornate system, the lmt values o the current an voltage are assume to be lm u lm, the ollowng ormula can be obtane: + (4) s u lm s u + u ulm (5) Because o the hgh spee steay state operaton o the motor, the resstance value s much less than the reactance value, so the voltage rop on the resstance s neglgble, by ormula (1), t can be euce that the steay-state voltage euaton s: u w L u w L + wy The euaton (6) nto the euaton (5), nshng the voltage lmt o ellptc euaton: ulm ( L + y ) + ( L ) w (6) (7) By ormula (7) shows that, when the motor voltage to the nverter can output voltage lmt, t contnues to accelerate, whch s reure to enter the el o weak control, to ncrease whle reucng to mantan the output voltage balancng eect. It can get the current lmt crcle an voltage lmt ellpse by ormula (4) an ormula (7). As shown n Fgure 1, curve OA represents the maxmum torue/current control trajectory, When the access to the weak control, the runnng track o the stator current s along the curve AB rom pont A to pont B, n orer to acheve the purpose o weakenng. T e1 T e1 > Te T e T max A T em B ω (- y L C,) u max max u s s ω 1 ω 1 < ω Fg. 1 stator current vector trajectory wr w 1 wmax Fg. control workng area control regon IPMSM or the weak control, workng area vson o current track an the changes o voltage, current an torue n the area as shown n gure, II regon can be consere to be the optmal control area marke n Fgure, n ths area, the maxmum power can be acheve when the parameters o the motor meet the specc reurements. In the constant torue regon shown n Fgure, the output torue s constant, an can be the 467
maxmum value. The counter electromotve orce o the motor s proportonal to ts rotatonal spee, an t becomes an upwar tren, so the output power s ncrease contnuously. The output voltage o the nverter reaches the maxmum value ater the pont A, an the spee s up to the rate value, whch has been shown n Fgure 1, n ths operaton mechansm, ue to the lmt o the current lmt cycle, the spee can't contnue to rse along the curve. I the motor spee contnues to ncrease, then enter the weak control area as shown n gure. In the el o weak I, the motor spee an torue are nversely proportonal to the output power s constant. I hgher spee s neee, the control nees to enter the area o the weak regon II, an the motor runs along the MTPV curve. The euaton can be expresse as: T e U s T e U s - The recton o MTPV s the tangent recton o the trajectory, by the ormula (8) can get the ollowng euaton: W - ( L - L ) L Ł W ł Ł - ( L - L ) L - ( L - L ) L y ł W W + W Accorng to the U value, the current reerence can be revse as ollows: (8) (9) (1) N DUT / T, DUW / W, regon Ⅰ regon Ⅱ (11) N DUT / T, DUW / W, regon Ⅰ regon Ⅱ In orer to make the output voltage oes not excee the maxmum voltage o the nverter, the nput current o the current regulator can be expresse as ollows: +, m (1) (13) (14) +, m In the ormula: an are the reerence current generate by the MTPA moule;,m are the value o the current reerence correcton value ater PI ajustment; an, m an are correcte current reerence values. control strategy The electrc vehcle electrc rve system can be output at constant torue at low spee, n orer to aapt to the ast startng, clmbng, acceleraton an other reurements; at hgh spee to acheve constant power lux weakenng control, to meet the reurements o electrc vehcle cruse spee, passng, an so on. Conserng the characterstcs o electrc rve system an the specal reurements o the esgn o vehcle IPMSM control system, when the control system o IPMSM s esgne, the weak control strategy s aopte, n orer to wen the spee range o the motor, to acheve hgh-spee constant power operaton. u u a u smax w u u b M ~ ω a b Fg. 3 the overall block agram o the IPMSM weak control strategy Fgure 3 s the IPMSM weak control strategy o the overall block agram, manly nclung: weak control moule, IPMSM motor moule, SVPWM generaton moule, coornate transormaton moule, nverter moule, spee an current control moule an so on. 468
System smulaton an result analyss Accorng to the weak control prncple o permanent magnet synchronous motor, the overall structure agram o the IPMSM weak control strategy s gven n Fgure 3, an the smulaton moel o IPMSM weak control system s bult n MATLAB by usng the above mentone weak control strategy, as shown n gure 4. The parameters o the motor moule: stator resstance R s.86w, rect axs nuctance L.55H, cross axs nuctance L.113H, permanent magnet lux lnkage y Wb, pole par p 4, moment o nerta.5 3 3 J 5.345 1 kg m, vscous rcton coecent F 1 1 N m s rate spee N 3r/mn.. DC bus voltage V - U c 537, - -4-6 4 Te - -4 6 n 4 -.5.1.15..5.3.35.4.45.5 Fg. 4 smulaton moel o IPMSM weak Fg. 5 smulaton waveorms o,, torue control system an spee When the gven spee s n 5r/mn, the IPMSM lmtng loa system smulaton waveorm o weak spee as shown n Fgure 5, n the gure, to.3s o the tme pero, the loa torue s T L 3N m;.3s to.5s o the tme pero, the loa torue s T L 1N m Startng torue s N m, rom Fgure 5 shows that,beore.15s, IPMSM system spee up to 5r/mn, n ths pero o tme, the AC, straght axs current s -5A, 7A; rom.15s to.s s the motor spee regulaton tme, the electro torue an loa torue are balance, n ths pero o tme, 1A, -4A;.3s later, when T L 1N m, the electro torue an loa torue are balance, at ths tme, -45A, 4A, spee own to 48r/mn.Above spee ajustment process, t s prove that the constant power weak spee control strategy s eectve. Concluson In orer to stuy the IPMSM we spee control o the vehcle, the basc prncple o the weak expanson s analyze, an the smulaton o the system s mae, smulaton results show that, ater the constant power an weak spee regulaton, the spee o the whole system s rase rom the rate spee 3r/mn to the spee 5r/mn, ully prove that the mprove spee range, whch lays a theoretcal ounaton or the practcal applcaton o hgh spee cruse an spee o motor vehcle, an proves a goo reerence value or the research o hgh perormance vehcle motor controller. Reerence: [1] Seung-k Sul,Zhang Yongchang,L Zhengx,et al.motor rve system control[m].bejng: Machnery Inustry Press,13,1. []Sheng Ya,Yu Shouy. Fel enng Operaton Control Strateges o Permanent Magnet Synchronous Motor or Ralway Vehcles[J]. Proceengs o the CSEE, 1,(3):74-79. [3]Luo Derong,Ceng Zhbo,Huang Shouao,et al. A Leang Ang le Fel enng Control Metho or Permanent Magnet Synch ronous Moto r on Electrc Vehcles[J]. Jour nal o H unan Unver sty. 11,38(3):1-5. [4]Tang Chaohu,Dng Qang,Yu Shouy,et al. Research o lux weakenng strategy o nteror permanent magnet synchronous motor[j]. ELECTRIC MACHINES AND CONTROL. 1, 14 (5):68-7. 469
[5]Yu Jabn,Qn Xaoe,Zheng Jun,et al. Improve leang angle lux weakenng control algorthm[j]. ELECTRIC MACHINES AND CONTROL. 1,16( 3) :11-16. 47