Isibonelo Semibuzo Yengxoxo Ngezimoto Zikagesi
Injini kagesi umshini oguqula amandla kagesi abe amandla omshini. Uyingxenye ebalulekile ezinhlotsheni ezahlukene zezimboni, ezentengiselwano, kanye nezicelo zasekhaya. Ukuqonda izimiso kanye nokusebenza kwama-motor kagesi kubalulekile, ikakhulukazi kubafundi bobunjiniyela kanye nochwepheshe emkhakheni kagesi. Kulesi sihloko, sizoxoxa ngezibonelo eziningana zezinkinga kanye nezingxoxo ezihlobene nama-motor kagesi ukuze sisize ekujuleni ukuqonda kwethu.
Izimiso Eziyisisekelo Zezimoto Zikagesi
Ngaphambi kokuba singene emibuzweni, kuyasiza ukubukeza izimiso eziyisisekelo zama-motor kagesi. Ama-motor kagesi asebenza ngesimiso se-electromagnetism, lapho ugesi odlula kukhoyili ukhiqiza insimu yamagnetic esebenzisana nensimu yamagnetic yomthombo wangaphandle ukuze ikhiqize ukunyakaza. Ngokuvamile, ama-motor kagesi ahlukaniswe ngezinhlobo ezimbili eziyinhloko: ama-motor aqondile (DC) kanye nama-motor ashintshanayo (AC).
Izingxenye Eziyinhloko Zemoto Kagesi
1. I-Stator: Ingxenye engaguquki yemoto evame ukuba namakhoyili ensimbi noma omazibuthe abangapheli.
2. I-Rotor: Ingxenye ejikelezayo yemoto evame ukuba nama-coil ensimbi noma omaginethi.
3. Ikhoyili: Ucingo oluzungezwe i-rotor noma i-stator ukuze kukhiqizwe insimu yamagnetic.
4. Umthombo Wamandla: Ihlinzeka ngogesi odingekayo ukushayela injini.
Imibuzo Eyisibonelo Nengxoxo
Umbuzo 1: Ukubala Isivinini Semoto ye-DC
Umbuzo: Imoto ye-DC enama-turn angu-500 nge-coil ngayinye isebenza ku-24V kanye no-5A. Uma i-motor constant \( K_m \) ingu-0.02 Nm/A, bala ijubane lokujikeleza kwe-rotor uma i-torque ephumayo ingu-1 Nm.
Ingxoxo:
Kuyaziwa:
– Inani lamajika (N) = 500
– I-Voltage (V) = 24V
– Ugesi (I) = 5A
– I-motor constant \( K_m \) = 0.02 Nm/A
– I-Torque (T) = 1 Nm
Kusukela ku-equation eyisisekelo yemoto ye-DC, siyazi:
\[ T = K_m \cdot I \]
\[ 1 Nm = 0.02 Nm/A \cdot 5 A \]
\[ 1 Nm = 0.1 Nm \]
Lokhu kusho ukuthi i-torque constant edingekayo ukukhiqiza i-1 Nm kugesi ongu-5 A ilungile.
Okulandelayo, ukubala isivinini sokujikeleza (\( \omega \)):
\[ E = K_m \cdot \omega \]
\[ V = E \]
\[ 24V = 0.02 Nm/A \cdot \omega \]
Kusukela lapha, singabala ijubane (\( \omega \)):
\[ \omega = \frac{V}{K_m} \]
\[ \omega = \frac{24V}{0.02 Nm/A} \]
\[ \omega = 1200 rad/s \]
Umbuzo 2: Ukusebenza kahle kweMoto Yokungenisa I-AC
Umbuzo: Injini yokungenisa enezigaba ezintathu inamandla okufaka angu-30 kW kanye namandla okukhipha angu-27 kW. Bala ukusebenza kahle kwenjini.
Ingxoxo:
Kuyaziwa:
– Amandla okufaka (P_in) = 30 kW
– Amandla okukhipha (P_out) = 27 kW
Ukusebenza kahle (\( \eta \)) kwenjini kungabalwa kusetshenziswa ifomula:
\[ \eta = \left( \frac{P_{out}}{P_{in}} \right) \times 100\% \]
\[ \eta = \kwesobunxele( \frac{27 kW}{30 kW} \kwesokudla) \izikhathi eziyi-100\% \]
\[ \eta = 0.9 \izikhathi eziyi-100\% \]
\[ \eta = 90\% \]
Ngakho-ke, ukusebenza kahle kwenjini yokungenisa kungu-90%.
Umbuzo 3: Injini Ehambisanayo
Umbuzo: Injini ehambisanayo inamapali amane futhi inikezwa imvamisa engu-60 Hz. Bala isivinini esihambisanayo senjini.
Ingxoxo:
Kuyaziwa:
– Inani lezinsika (P) = 4
– Imvamisa (f) = 60 Hz
Ijubane elihambisanayo (n_s) lenjini ehambisanayo lingabalwa kusetshenziswa ifomula:
\[ n_s = \frac{120 \cdot f}{P} \]
\[ n_s = \frac{120 \cdot 60}{4} \]
\[ n_s = \frac{7200}{4} \]
\[ n_s = 1800 \, RPM \]
Ngakho-ke, ijubane elihambisanayo lenjini ehambisanayo lingu-1800 RPM.
Umbuzo 4: I-Torque Yemoto Ewuchungechunge lwe-DC
Umbuzo: Injini yochungechunge lwe-DC inokumelana kwekhoyili okungu-0.5 ohms futhi ihlinzekwa nge-voltage engu-120V. Uma ukugeleza kwamandla kagesi kungu-10A, bala i-torque uma i-torque engaguquki ingu-0.1 Nm/A².
Ingxoxo:
Kuyaziwa:
– Ukumelana nekhoyili (R) = 0.5 ohm
– I-voltage yokunikezela (V) = 120V
– Ugesi (I) = 10A
– I-torque engaguquki \( K_t \) = 0.1 Nm/A²
Okokuqala, bala ukwehla kwamandla kagesi kukhoyili:
\[ V_R = I \cdot R \]
\[ V_R = 10A \cdot 0.5 \Omega \]
\[ V_R = 5V \]
I-voltage esebenzayo (V_eff) esebenza kumotha:
\[ V_eff = V – V_R \]
\[ V_eff = 120V – 5V \]
\[ V_eff = 115V \]
I-Torque (T) ingabalwa kusetshenziswa ifomula:
\[ T = K_t \cdot I^2 \]
\[ T = 0.1 Nm/A² \cdot (10A)^2 \]
\[ T = 0.1 Nm/A² \cdot 100 A² \]
\[ T = 10 Nm \]
Ngakho-ke, i-torque ekhiqizwa yi-DC motor yochungechunge ingu-10 Nm.
Umbuzo 5: Isiqalisi Semoto Yokungenisa
Umbuzo: Uchwepheshe ufaka i-star-delta starter ku-50 kW induction motor. Bala i-start current yokuqala uma i-voltage yokusebenza ingu-400 V futhi i-motor inamandla angu-92%.
Ingxoxo:
Kuyaziwa:
– Amandla enjini (P) = 50 kW
– I-Voltage (V) = 400V
– Ukusebenza kahle (\( \eta \)) = 92%
Okokuqala, sibala amandla okufaka (P_in):
\[ P_{in} = \frac{P}{\eta} \]
\[ P_{in} = \frac{50 kW}{0.92} \]
\[ P_{in} = 54.35 kW \]
Njengoba injini isebenzisa uhlelo lwe-star-delta, ugesi oqalayo enkanyezini uzoba ngaphansi kunogesi ngesikhathi sokusebenza kwe-delta. Kodwa-ke, ukuze sibale ugesi ojwayelekile, singasebenzisa i-P_in kanye ne-V:
\[ I_{nom} = \frac{P_{in}}{\sqrt{3} \cdot V} \]
\[ I_{nom} = \frac{54.35 kW}{\sqrt{3} \cdot 400V} \]
\[ I_{nom} = \frac{54350}{692.82} \]
\[ I_{nom} \cishe 78.44 A \]
Ukuze uqale amandla kagesi uma usebenzisa isekethe yezinkanyezi:
\[ I_{start\_star} = \frac{I_{nom}}{\sqrt{3}} \]
\[ I_{start\_star} \cishe \frac{78.44A}{\sqrt{3}} \]
\[ I_{start\_star} \cishe kube ngu-45.28 A \]
Ngakho-ke, ugesi wokuqala oqalayo kumjikelezo wezinkanyezi cishe u-45.28 A.
Isiphetho
Ukuqonda izibalo eziyisisekelo zezinhlobo ezahlukene zama-motor kagesi kubalulekile kulabo abasebenza kubunjiniyela kagesi nobemishini. Izibonelo zezinkinga ezingenhla zibonisa ukuthi amapharamitha ahlukahlukene njenge-voltage, i-current, i-torque, kanye nokusebenza kahle adlala kanjani indima ekunqumeni ukusebenza kwe-motor kagesi. Ngokuzijwayeza njalo, ikhono lokuxazulula izinkinga ezinjengalezi lizoba usizo kakhulu ekusetshenzisweni okusebenzayo nasemsebenzini.
