Introduction. Voice Coil Motors. Introduction - Voice Coil Velocimeter Electromechanical Systems. F = Bli

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UNIVERSITY O TECHNOLOGY, SYDNEY ACULTY O ENGINEERING 4853 Elecroechncl Syses Voce Col Moors Topcs o cover:.. Mnec Crcus 3.

When ece by n elecrcl curren o spece wveor, he voce col crryn he curren wll ove (vbre) n prouce soun by he spece wveor snce he

Ths e cn be eene o rec rve lner cuors or pplcons h requre posonn over sll rne ro crons o nchs, such s be seern rrors, plo vlve

1 UNIVERSITY O TECHNOLOGY, SYDNEY ACULTY O ENGINEERING 4853 Elecroechncl Syses Voce Col Moors Topcs o cover:.. Mnec Crcus 3. EM n Voce Col 4. orce n Torque 5. Mhecl Moel 6. Perornce Voce cols re wely use lou spekers. When ece by n elecrcl curren o spece wveor, he voce col crryn he curren wll ove (vbre) n prouce soun by he spece wveor snce he orce l s proporonl o he curren. Ths e cn be eene o rec rve lner cuors or pplcons h requre posonn over sll rne ro crons o nchs, such s be seern rrors, plo vlve conrol, n hr sk rves. Core Voce Col - Voce Col Veloceer - Voce Col Veloceer In he vbron es o echncl enneern, sple elecronec evce conssn o wre wrppe col n ne s use o boh rve he syse (voce col oor) n esure he velocy o he syse (veloceer). Enlre vew o he voce col veloceer

2 - Hr Dsk Drve Hr sk rve or rec ccess sore evces s one o he jor pplcons or voce col oors. - Hr Dsk Drve (Con.) Schec cu wy vew o hr sk - Hr Dsk Drve (Con.) - Hr Dsk Drve (Con.) rushless spnle oor n he rve crcu bor. Ol hr sk rves use seppn oor or poson conrol o re/wre he

3 - Hr Dsk Drve (Con.) - Hr Dsk Drve (Con.) New hr sk rves use voce col oors or poson conrol o re/wre he Schec llusron o re/wre he poson conrol usn voce col oors or lre hr sks - Hr Dsk Drve (Con.) - Hr Dsk Drve (Con.) Re/wre he o sll sze hr sk Re/wre he o sll sze hr sk

- Generl Purpose Voce Col Lner Acuor Mnec Crcus - Lerl Voce Col Moors The e o voce col

Movn Col Movn Col Movn Col Movn Col The srucure cn be eher cylnrcl or recnulr Mnec Crcus -

Col Cross secons o rory voce col oors use n hr sk rves The e n he voce col cn be clcule by he

4 - Generl Purpose Voce Col Lner Acuor Mnec Crcus - Lerl Voce Col Moors The e o voce col oor/cuor cn be eploye or enerl purpose lner rves. Movn Col Movn Col Movn Col Movn Col The srucure cn be eher cylnrcl or recnulr Mnec Crcus - Rory Voce Col Moors EM n Voce Col - Arc Type Rory Voce Col Moor l l Re/Wre He Movn Col Movn Col Cross secons o rory voce col oors use n hr sk rves The e n he voce col cn be clcule by he ry s lw e λ λ λ + λ, λ L, n λ re he lu lnkes o he voce col ue o he curren n he col n he pernen ne. Thereore, e L λ + Noe h L s nepenen o col poson. R

5 l Φ EM n Voce Col - Arc Type Rory Voce Col Moor I he col hs N urns, he sel nucnce s nepenen o he col poson n cn be eerne s N L R core R core s he relucnce o he core. l The nuce e n he col ue o he pernen nes cn be clcule s λ e N l v v v / s he spee n he lu ensy n r p. orce n Torque - Arc Type Rory Voce Col Moor The ol orce cn on he col cn be clcule by N l Assue he snce beween he col cener n he sh s R. The orque prouce by he col s hen T R N l R Noe h he orce cn lso be clcule by W ' L L + I + I L Snce L / n L /, we hve he bove resuls. Mhecl Moel - Elecrcl Crcu Equon The elecrcl crcu equon or he voce col s V ( L) λ R + + R L or he rc ype rory voce col oor, he sel nucnce s nepen-en o he col poson, n he bove equon becoes V e V R + L + e e λ / N l v v s he nuce e n he col ue o he pernen ne, N l s he e consn, n v / s he spee. Mhecl Moel - Mechncl Equons The echncl syse or hr sk rve s llusre on he rh hn se. y Newon s lw, we hve v lo lo + v Col o ss s he lo orce ue o he sprn n per. Sprn Dper s he elecronec orce prouce by he curren n he col, N l he elecronec orce consn, n

6 Mhecl Moel - Se Equons When he elecrcl n echncl equons epresse n he or o se equons, we obn R L L v + L V v v n v These equons cn be solve oeher wh nl conons ( ), v( ) v, n ( ) Perornce - Wh Curren Source Supply Wh curren source power supply, he elecrcl rnsen cn be nore. Only he echncl rnsen nees o be consere. To sply he proble, le us conser n rc ype voce col oor supple by n el squre wve curren source uner no lo. The overnn equons o he syse re : v n v The nl conons re ssue o be zero,.e. v( ), n ( ) l Perornce - Wh Curren Source Supply (Con.) The ollown wveors llusre he response o n rc ype voce col oor uner squre wve curren source econ. v v v Perorce - Wh Vole Source Supply Wh n el vole source power supply, he response o n rc ype voce col oor cn be obne by solvn he se equons o he syse. When he echncl lo s ccoune or, he se equons us be solve nuerclly. I no echncl lo s ssue, however, nlycl soluon cn be obne. The overnn equons o he syse n hs cse re : R + n L L v L V N l n v n he ssue nl conons re ( ), v( ), n ( ) N l v

7 Perornce - Wh Vole Source Supply (Con.) The nlycl soluon o he oor uner squre wve vole source econ s: or <, E ( ) ( s s ) e e L s s v n v or, s, s ± 4 τ ( τω ) s A e e A s s s ( ) v v se se τ L R n ω L + n ( ) + v e e s s s s ( ) G n G Perornce - Wh Vole Source Supply (Con.) I s porn o noe h n v <. The col reverses s recon o oon. Thereore, hs ype o vole conrol s no use n sk rve pplcons s crucl h he col brn he R/W hes o spece rck n sy here urn ren n wrn. Perornce - Wh Vole Source Supply (Con.) In prcce, vole prole bse on he vole conrolle phse plne rjecory s use. Perornce - Iprovn Voce Col Moor Perorence by Shore-Turn In voce col oor, he ccelern orce on he ovn col s recly proporonl o he curren n he col. Thereore, he ser he curren rses, he ser he col woul respon. or hr sk rve, he ccess e woul be shorer. One wy o ccoplsh hs s o plce copper ube (shore urn) concenrc o he ovn col. l Copper Tube V R L e

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Wave Phenomena Physics 15c Wv hnon hyscs 5c cur 4 Coupl Oscllors! H& con 4. Wh W D s T " u forc oscllon " olv h quon of oon wh frcon n foun h sy-s soluon " Oscllon bcos lr nr h rsonnc frquncy " hs chns fro 0 π/ π s h frquncy ncrss