ѹ : 2011-06-10 18:01:42 ӹǹҪ : 11543 views

㺾Ѵк¤͹Ѻ俿

价ǢͧѺػó俿 ҧ俿ҷӧҹҧ Ҩǹ÷ӧҹͧ Ѻ㺾Ѵк¤͹ͧ ҧҧ͹㨼ԴҧҴ֧

㺾Ѵк¤͹Ѻ俿
ҧҧسҨѧ

آ
changmotor@gmail.com


     

          价ǢͧѺػó俿 ҧ俿ҷӧҹҧ Ҩǹ÷ӧҹͧ Ѻ㺾Ѵк¤͹ͧ ҧҧ͹㨼ԴҧҴ֧ ͧͧ㺾Ѵͧ֡ʹ ա¹ǡѺ ѹ 鹰ҹ (Affinity Laws) öѺ㺾Ѵش (Blower) 㺾Ѵ (Impeller) зǹ鹰ҹҧҧǡѺ㺾Ѵ ͨ͸Ժҷ¹ŧ㺾Ѵ§硹 Դ¹ŧҡ ǡѺͧСͺӤѭѧ
          * ҵ ͻҳ͹ͧҡ
          * çѹʶԵ
          * Ŵ
          * Ҥ٭ (ԷҾ)

          ٴ֧ҹ繧ҹ ͹任ءҹѺ㺾Ѵ 㺾Ѵش 㺾Ѵк¤͹ͧ俿 ੾͹Ѻ俿һ TEFC, IP54 (㺾Ѵк¤͹ҹ͡ѹʴѧٻ 1) ͡ʻѺاԷҾͧբԧ

ѹͧ鹢ͧ㺾Ѵ
          ѹҧѴǹͧ㺾ѴբҴᵡҧѹзԴ ѧҹͧ (Power) зԴع դҡѺѵǹᵡҧͧ鹼ٹҧ㺾Ѵ¡ѧ ٳѺѧҹ СóբҴͧ㺾Ѵա¹ŧ ѧҹͧ ع㺾Ѵ ͺ դҡѺ ѵǹ¹ŧͺ¡ѧ 3 ͧѧҹ
          Hp2/Hp1 = (d2/d1)5
          Hp2/Hp1 = (rpm2/rpm1)3
          ͵ͧ÷Һҡ¹ŧзԴҧáѺ㺾Ѵ ҵͧҺջҵâͧ

          ͹ çѹҡ ҵҡȷ㺾ѴԴ͹ ¹ŧѴǹѺѵǹ¹ŧҴ鹼ٹҧ㺾Ѵѧ ѴǹµçѺ¹ŧͺ
          Volume2/Volume1 = (d2/d1)3
          Volume2/Volume1 = rpm2/rpm1

          ա˹觷觼ŵ͡Ţͧҵҡ ѹʶԵͧҡ (Static Pressure) ͹ͧҡ㹺ҡȻ ҧдǡҺҡȷդѹʶԵդ٧ ҡȷդѹͤ˹ҡ зԴԷԼ㹡к¤͹ա 仵 áԷҷػ 繵ǡҧк¤͹աҡ դ˹ҡ

㹷ҧѺѹ حҡ繵ǡҧ ҡȷзԴ͹ ա˹觷ռŵͤҤ˹蹢ͧҡ дѺ٧˹дѺӷ ҹ٧ 1,000 ͧ٧˹дѺӷ Ҥ˹蹢ͧҡȨŴŧ еͧաþԨó繾աùҹ

          ҤѹʶԵҡͻҵâͧҡդ٧ зԴáҧҡ ҧ繪鹿鹼 觼ҡԴ͹ ˹վ鹷ͧк¤͹ҡ觢

          ѹʶԵ㹷ҧشԵͧդҡͷзԴҤ˹蹢ͧҡȷ ͧ ҡԴҡȷش (Dead Air) մҧк¤͹ ѹʶԵ (SP) ¹ŧѴǹѺ¹ŧͺ ¹ŧ繡ѧͧͧ¹ŧҴ鹼ٹҧ
          Sp2/Sp1 = rpm2/rpm1
          Sp2/Sp1 = (d2/d1)2

ҧԴ鹨ԧ
          ͧҾԨóҴ١óշԴ鹨ԧ 觨ʴ èԴ鹶ա ѹ鹰ҹ աö١

          ҹ˹觵ͧҳ Air Flow ͧ բҴ 25 ç Ѻ㺾ѴҴ 鹼ٹҧ 24 Ƿ 450 ͺ ҧѴǹѺ Ѻ 75 ç 㺾ѴҴ鹼ٹҧ 40 ع 850 ͺ ѧҡʵҷ öѺ㺾Ѵդǵͧ ͹좹Ҵ 75ç ͸Ժҧ 鹵͹ա͡ẺͤӹdzԴҴ

          Ҩͧӡѹ鹰ҹ㹡͡ẺеǨͺ ͹蹵ͧԨóҼŢͧ¹Ҵ㺾Ѵ 觨ǢͧѹѺѧҹ¡ѧ 5 ¡ѧҹͧա¹Ҵ㺾Ѵҡ 24 40 ҡ
           Hp2/Hp1 = (d2/d1)5
           Hp2 = Hp1(40/24)5 = 12.86 Hp1
          ҡäӹdzçͧèդһҳ 13 ҢͧçѺ㺾ѴբҴ ˭ դͺ

          ͹ ͺ çҷͧáѹ繡¹ŧͺ¡ѧ 3 ͺ¹ҡ 450 850 ͺ çҷͧҡѺ (850/450)3 = 6.74 ҳ 7 Ңͧç

          ص㺾Ѵ ͧçҡѺ 15 ç (شѴѡ͡Ẻ, Oversized ͺҪç¢ͧ㺾Ѵ) 450 ͺ ѧҡաԿ çҷͧèդ 12.86 x 6.74 x 15 = 1,300 ç 觷š·ҷ 75 çҶ֧ աùҹ

ûѺ觢Ҵ㺾Ѵ 㺾Ѵ (Trimming)
          ҡ˵ب繵ͧաûѺ觢Ҵ㺾Ѵ 㺾Ѵ (Trimming, ֧㺾Ѵ͡ բҴŧ硹) բҴŧ仡 觼çҢͧ㺾ѴŴŧ ͧҡ㺾Ѵͧ ѹ鹰ҹ çҷ¹ŧ仵 ͧҡ¹Ҵ㺾Ѵ ա ¹ŧҧǹͧ㺾Ѵ ֧çҷ¹ŧ仵ѹз 觡ѹ ´ѧ

          Hp2/Hp1 = (d2/d1)4
          Hp2/Hp1 = (rpm2/rpm1)2

          ѹ鹰ҹ١һѺ䢢ҧ Ͷ١㹡ûѺ (Trimming) Ҵͧ㺾Ѵ㺾Ѵ ö㹷ҧԺѵҧ ͧ繡ûѺ੾ТҴͧ鹼ٹҧҹ

ػóѺͺ㺾Ѵк¤͹
          㹡ҹػóѺͺ شʧͷաҹ ͺӡҤͺԡѴ͡Ẻ ͧҡѹͧҳк¤͹ ѴǹѺͺ 觼 աŴͺͤ˹ зҳк¤͹żҹ դŴŧ ˹觴 աùӤҤѹʶԵҾԨóҤ ˹ 㺾Ѵع¤Ǥ˹ ͹ҳҡȤ˹ դҤѹʶԵҡȤ˹觴 觼ԷҾ㹡к¤͹Ŵŧ仨ҡ١͡Ẻ

 

ٻ 1 ʴк¤͹ͧ TEFC

ͧСͺ 觼ŵ͡Ţͧ
          Ҥͺ㺾ѴպҷӤѭͻԷҾͧҳ ҷ˹ҷͧҤͺѴ͡˹ȷҧзм¹ͧ͡Ҩѹ ˹ҷФӤѭͧͧ , ԴҤͺѴ¤Ҩѧ ҡȨ͹ҡdzդѹ٧ѧdzդѹ 觷ҧѹͧҡ٧㺾Ѵ 觼ҡŶк¤͹ǹҧ ͧ 件֧Ҵҹ˹ 觴ҹ˹Ңͧʴѧٻ  1

          ٻ 2 ʴҪͧԴзҡԴáШ͡㺾Ѵ ҡȷ͹ҹͧҤͺѡɳº (Turbulent) 㹪ǧҧҡҤͺ ҳ 3 Ңͧ ҧͧҤͺ㺾Ѵ йͷԴüѡѹҡҧջԷҾ ҧͧ㺾Ѵ ѺҤͺͧҧѹ¡ 3 ҢͧҧͧҤͺ㺾Ѵ صͧҤͺ㺾Ѵ բҴ 11 . 㺾ѴͧҧҡҤͺ¡ 35 . ͧѧ㹡óյͧ͡ẺͧҤͺբҴ йصˡԵд ҨԴѭҡشѹҤͺ

          ҾҤͺѴҹʴٻ 2 ʴҡٻẺ㹡͡ẺҤͺѴ ٻҧТҴͧԴͧҤͺѴѧᵡҧѹ͡ա 觼зԴҡº դҡѹ (Turbulent) ҧͧҤͺѴ㺾ѴѺТѺҧ ͧͧԴͧ     Ҥͺ йҡաë ж١Ǩ дѧ仵ҷѺ öлѺاҳżҹ繡ûѺاԷҾͧ
     

ٻ 2 ʴҧͧҤͺѴѺ㺾Ѵ ЪͧԴͧҤͺѴẺҧ

          ͧԴ᤺ҷԴҡº鹡 ͧԴٻҧҹ͹ͧ ҡȨзҡա͹дǡ (ѧࡵҾ a, b, c ٻ 2) ͧԴҾѴ繷ç зԴ͹ͧҡաẺ 4 Ẻ ЪͧԴ͡Ẻ͹աͧԹ Դ͹ͧҡշش
    

     
    ٻ 3 ʴѡɳл¤պк¤͹ҹҤͺѴ


          ͧҡ㺾Ѵ١ع ҡȶ١㺾ѴзӡԴҡع Ҩж١͹ ǵçԷҾ㹡к¤͹ͧ պҹͧ͡ TEFC (IP 54) ˹ҷ¹ع͹ǵç 觷˹ҷҡ˹ҷѡ (鹷ʢͧ ԷԼ㹡к¤͹) ¤պҹѺ (Leading Edge) Ԩѡɳ (¡Ѻ»աҹѺͧͧԹ)

ͷҡ͹ҧдǡ ŴԴҡ º (Turbulent) ¤պŻ ѧٻ 3 Ъ㹡͹ ͧҡҡ 㹡͡Ẻҧ駵ͧºҧ (Turbulent) Դ ҡȷ͹ (Dead Air) ͵Ǣ ¹ͧ͡պèռºҡѡ Ш觼ŵͻԷԼ㹡ö෤͹

͡㹡ԷҾͧ
          Ѵ Ѵк¤͹ҹͧ͡ TEFC ͧҡ 㹰ҹз繼ǢͧѺ ѡ㨡Ѻöͧ㺾Ѵк¤͹Ѻ еҺ 㺾Ѵѧö˹ҷ ͧҾ

          ;Ԩóҡ͡Ẻͧ㺾Ѵ 龺͡ʢͧԷҾѺ  ûѺ¹㺾Ѵ (Upgrade) ԸշѺԷҾͧ쪹Դк¤͹¾Ѵ¹͡ (TEFC) ͧաþѹ

          TEFC ͺ㺾Ѵѡɳᩡ мԵͧ÷Ш عȷҧ㴷ȷҧ˹ µͧ÷ö١ҹͧȷҧ (ع зǹ) öɷͧšѺԷҾͧ٭

㺾Ѵѡɳᩡ ԷҾ٧ش§ 60 %觵çѺ㺾ѴẺعȷҧǷԷҾ٧ش֧ 92% ¶֧ ¹㺾ѴẺعҧöŴҤ٭¡ѧҹͧع㺾Ѵ (Windage Lossed) ֧ 8 ᷹㺾ѴẺᩡ صԵҧ ѧҹ㹡ع㺾ѴẺᩡ 100 W ºº繤Ҥ٭ա¹ͧ㺾Ѵ

* 㺾ѴẺᩡ  
          ѧҹ١ 100 W 繤ҹԧ 60 W, Ҥ٭ 40 W (ԷҾ 60%)   ¤ǹͧä ѧҹͧӧҹԧ 60 W

* 㺾ѴẺعҧ᷹㺾ѴẺᩡ
          ѧҹ١ 60/0.92 = 65.2 W (ԷҾ 92%) դ٭ 65.2– 60 = 5.2 W  й鹨ҤҤ٭Ŵŧ 40/5.2 = 7.7 ͻҳ 8
 

      ٻ 4 ʴººҤ٭

          Ѻ ҧѴਹ͡ʷԷҾ TEFC բ ҡҹç (End User) ͧ÷ȷҧعҧ˹ ¹ҡ㺾ѴẺᩡԴҡѺ Ẻعȷҧ ¤ TEFC ѺŴ Ѵ աҹȷҧ öзӡûѺاԷҾ
     

ٻ 5 ʴٻҧͧ㺾ѴẺҧ

ѡӤѭͧӹ֧
          ŴҤ٭µҧ Դ 繡ԷҾ ҧ 1 ʴҤ٭¢ͧѧҹ ͧѺ㺾ѴºѺҤ٭¡ѧ ͧ TEFC ѹ㹻Ѩغѹ ж ҡ դҤ٭´ҹѧ Ӥ 9,500 W 繤Ҥ٭ ͧ 200 HP 令ӹdzѴǹ㹵ҧ 1

          Ӥѭشͧ ͡÷աк¤͹ҧ§ աŴ٭· ԴâѺ㺾Ѵ СŴҤ٭¹ ͧöѴҡûѺاԷҾͧ繵Ţ ҧ 1 ʴ´Ҥ٭ ӹǹ繵ͧԷҾ ҡûѺا¡¹ͧ㺾Ѵ

          ͧСͺ ͧդҤ٭¶١Ŵŧ 觷ҡͻԷҾ شʧѡͧ ҡӵҧ 1 ҾԨó 觨͡ʷлѺا ԷҾͧ ¡¹ٻẺ (Design) ͧ㺾Ѵ öԧ

          ԷҾҡûѺا СԴԷԼŢͧк¤͹բ Шд֧ٴԴŧع Ш繡Ŵ ͵鹷ع öҹҧͧ Դ դʶҾաҾ㹷ҧԺѵԡѺءǷẺ㺾Ѵعȷҧ ͧԴҡ١ѹءѹءջԷҾ§ѡ 1/2-1% зöѴѧҹ繨ӹǹҡ ͧա¹

ҧ 1 ʴҤ٭ Windage Loss ͧ㺾ѴẺҧ


˵
   Radial Fan = Ѵᩡ Ẻ
   Airfoil Fan = Ѵعȷҧ

          ͧСͺաҧ˹ 2 ա͡ẺդҤ٭ҡ 4 ͺӷ ԷҾ٧ ա͡ẺջԷҾա ͡Ẻ I2R Core Loss ӡ 觼ԵöŴҴ㺾Ѵŧ ٭¨ҡ㺾Ѵ (Windage Lossed) Ŵŧ繡ԷҾͧ㹷ش (Pre-EPact Motor) 繵͡ ʹѺûѺاԷҾ ͧҡդҤ٭´ҹçѺ٧ 㹢з蹻Ѩغѹ (EPact Motor) դöѺاԷҾҳ 1/2% 㹢зûѺاԷҾ ¡ ¹ԷҾ٧ѧ觨

дѺ§ (Noise)
          ͧСͺӤѭش·еͧҾԨóҡ͡Ẻ㺾Ѵ §Դҡҡȷ͹ ҹ㺾ѴЪǹѺ (Aerodynamic Noise) 㹡觼ҹҳҡѹ 㺾ѴẺعҧ СԴ§ (Noise) зӧҹ ¡㺾ѴẺᩡ

          ŷҡõǨѴ 㺾ѴẺᩡ §ѧзӧҹҡ 㺾ѴẺعҧ 5 dbA ͧ觼ҹҳҡѹ 觨դҵҧѹҡ ФҤѧͧ§ 繤Ẻ Logarithmic ·Ҥѧͧ§ 3 dbA ҡһ дѺѧͧ§ѧһͧ й鹡¹㺾ѴẺعҧǨзŴҤѧͧ§֧ 5 dbA 觷繡ŴдѺѧͧ§Ѵ

ػ
          ѹ鹰ҹ ŷӤѭǡѺسѵԡ÷ӧҹͧ㺾Ѵ 繡Ե Եա÷ͺ㺾ѴҴ˹觷١͡Ẻ ҡ鹡ѧҴҧ ٻҧ͡Ẻǡѹ зӧҹͺҹǡѹ ա˹ ЪǢͧѺëǡѺ͹ͧҡ (Airflow) к¤͹ͧ Фö㹡ûѺاԷҾͧ٧

          ǡѺѹҧ㺾ѴѺҤͺ㺾Ѵͧ СԴǤԴеǨͺԷԼ٧شͧҳżҹ 觹觷ӤѭҡѺк¤͹ͧͧѺСѹͧԡçҹ öлѺاԷҾͧ㺾Ѵ͡Ẻ ¹㺾ѴջԷҾա 件֧䢽Ҥͺ㺾Ѵ 觨зŧҹФ㨷觢

          Ѻ (Pre-EPact Motor) դҤ٭´ҹç դ٧ҡ ԷҾ٧͹ҧҡ ûѺاդҡ 1% ͧö

          ͧҴٵҧ çҹ˹ 50 HP ӹǹ 30 ջԷҾ 91.7% ººѺ蹻Ѩغѹ (EPact Motor) ջԷҾ 93.0% 繡ûѴѧҹ ¤ ʹѺʹعա¹ ҾԨóҴҹŧع ͡Ѵ ͡¹㺾Ѵ ҨѾͧûѴѧҹᵡҧ աŧع¡ҡ Ш仡е餹ǹҡ͡㹡õѴԹŧع¡

          ҡͧ֡ҢǡѺ 㺾Ѵ С͹ͧҡ (Fan and Air Flow) ö֡ҡ˹ѧ Fan Handbook ¹ Frank P.Bleire Ѵ McGraw –Hill.

͡ҧԧ
          * EASA Newsletter October 2002

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