Cooling time of an Induction motor

Cooling status is referred to the condition defined by a motor temperature reduction caused by a decreasing current from running condition to a less than the Full Load Amps (FLA)​​ condition known as minimum running condition. The cooling status is also initiated by a stopped motor following a running condition.

Motor thermal status, also referred as motor thermal capacity is a parameter used to evaluate the thermal condition of the​​ motor.

Thermal status is measured in percentage of the motor thermal limit. When a motor is stopped for a long time, the thermal status is 0% which means that zero percent of its capacity is used. At motor starting, the thermal capacity used can reach let's said 40%. If the motor has two cold starts, then the thermal capacity after these actions would be 80%. Exceeding the thermal capacity of the motor produces a loss of insulation life due to deterioration by overheating the windings.​​ 

During the cooling time, the thermal status decreases from a higher running thermal status to a lower one.

The equation of the cooling motor is given by:

θactual=θfinal+θinitial-θfinale-t/τ

where:

θinitial:​​ Thermal status at the start of the cooling period (t= 0) in percent

θfinal   :​​ Thermal status at the end of the cooling period (t → ꝏ) in percent

θactual:​​ Thermal status after time​​ t​​ in percent

t           :​​ Time in seconds

τ           :​​ Cooling time constant in seconds

Thermal status is proportional to I squared and the equation can be expressed in the following form:​​ 

I2(t)=I2f+I20-I2fe-t/τ

where:

I20:​​ Motor current squared at the start of the cooling period (t= 0) in per unit (pu)

I2f :​​ Motor current squared at the end of the cooling period (t → ꝏ) in pu

I2(t):​​ Motor current squared after time​​ t​​ in pu

t      :​​ Time in seconds

τ      :​​ Cooling time constant in seconds

 

Example

A motor with a cooling time​​ constant of 3.5 hours is stopped with a thermal status of 90%. Calculate the time required to reach 40% motor status.

 

Replacing the data in the first equation gives:

40=0+90-0e-t/12600

t=-12600 ln4090=10217 s

The required time is 2 hours 50 minutes.

The curve below shows the motor thermal status​​ variation with time for this example.​​  

Ernesto Hidalgo-Tupia, Eng., M. A. Sc.​​ 
Electrical Engineer

 

 

 

pdf3 Download PDF

1 435 thoughts on “Cooling time of an Induction motor

  1. Pingback: 寝取られ
  2. Pingback: topfucksearch.mobi
  3. Pingback: we-b-tv.com
  4. Pingback: hs;br
  5. Pingback: tureckie_serialy
  6. Pingback: serialy
  7. Pingback: 00-tv.com
  8. Pingback: +1+
  9. Pingback: watch
  10. Pingback: ++++++
  11. Pingback: HD-720
  12. Pingback: 2020
  13. Pingback: Video
  14. Pingback: wwin-tv.com
  15. Pingback: movies
  16. Pingback: movies online
  17. Pingback: karan johar
  18. Pingback: Top Movies
  19. Pingback: Movies1
  20. Pingback: 11 10 2019
  21. Pingback: Serial smotret
  22. Pingback: kinokrad
  23. Pingback: kinokrad 2020
  24. Pingback: Watch TV Shows
  25. Pingback: casino
  26. Pingback: filmy-kinokrad
  27. Pingback: kinokrad-2019
  28. Pingback: serial
  29. Pingback: cerialest.ru
  30. Pingback: youtube2019.ru
  31. Pingback: dorama hdrezka
  32. Pingback: movies hdrezka
  33. Pingback: HDrezka
  34. Pingback: kinosmotretonline
  35. Pingback: LostFilm HD 720
  36. Pingback: bofilm
  37. Pingback: 1 seriya
  38. Pingback: topedstoreusa.com
  39. Pingback: hqcialismht.com
  40. Pingback: genericvgrmax.com
  41. Pingback: canpharmb3.com
  42. Pingback: 4serial.com
  43. Pingback: See-Season-1
  44. Pingback: Evil-Season-1
  45. Pingback: Evil-Season-2
  46. Pingback: Evil-Season-3
  47. Pingback: Evil-Season-4
  48. Pingback: Dollface-Season-1
  49. Pingback: serial 2020
  50. Pingback: Dailymotion
  51. Pingback: Watch+movies+2020
  52. Pingback: Genfio.com
  53. Pingback: fioricet2020.com
  54. Pingback: tvrv.ru
  55. Pingback: 1plus1serial.site
  56. Pingback: #1plus1
  57. Pingback: 1plus1
  58. Pingback: Top 10 Best
  59. Pingback: human design
  60. Pingback: dizajn cheloveka
  61. Pingback: human-design-space
  62. Pingback: koma 2020
  63. Pingback: The-Gentlemen
  64. Pingback: led-2
  65. Pingback: pod-vodoi
  66. Pingback: vk 2020
  67. Pingback: DSmlka
  68. Pingback: viagra
  69. Pingback: viagra online
  70. Pingback: +
  71. Pingback: ¯jak Son³k
  72. Pingback: astrolog
  73. Pingback: generic cialis
  74. Pingback: cialis 20mg
  75. Pingback: watch online
  76. Pingback: kinoxaxru.ru
  77. Pingback: generic viagra
  78. Pingback: viagra online
  79. Pingback: viagra
  80. Pingback: buy cialis
  81. Pingback: viagra pills
  82. Pingback: cialis
  83. Pingback: generic viagra
  84. Pingback: buy cialis cheap
  85. Pingback: levitra
  86. Pingback: cialis pills
  87. Pingback: strelcov 2020
  88. Pingback: film t-34
  89. Pingback: online pharmacy
  90. Pingback: canadian pharmacy
  91. Pingback: Cialis online
  92. Pingback: cialis generic
  93. Pingback: buy viagra
  94. Pingback: cialis
  95. Pingback: sildenafil citrate
  96. Pingback: sildenafil
  97. Pingback: generic cialis
  98. Pingback: Beograd film 2020
  99. Pingback: psiholog
  100. Pingback: psyhelp_on_line
  101. Pingback: coronavirus
  102. Pingback: cialis 20
  103. Pingback: PSYCHOSOCIAL
  104. Pingback: buy cialis pills
  105. Pingback: Us viagra sales
  106. Pingback: viagra 100mg
  107. Pingback: online cialis
  108. Pingback: cialis 20
  109. Pingback: order chloroquine
  110. Pingback: best cialis site
  111. Pingback: cialis canada
  112. Pingback: generic levitra
  113. Pingback: doctor7online.com
  114. Pingback: cialis pill
  115. Pingback: generic ventolin
  116. Pingback: Order viagra us
  117. Pingback: film doktor_liza
  118. Pingback: cbd benefits
  119. Pingback: cbd hemp oil
  120. Pingback: djoker film
  121. Pingback: viagra
  122. Pingback: 20mg cialis
  123. Pingback: buy viagra online
  124. Pingback: cialis on line
  125. Pingback: cialis generic
  126. Pingback: generic viagra
  127. Pingback: cialis coupon cvs
  128. Pingback: cialis at walmart
  129. Pingback: viagra online
  130. Pingback: Ritonavir
  131. Pingback: cheap viagra
  132. Pingback: viagra for sale
  133. Pingback: cialis dosage
  134. Pingback: viagra 50mg
  135. Pingback: viagra generic
  136. Pingback: cialis online
  137. Pingback: buy ed pills
  138. Pingback: tadalafil 20 mg
  139. Pingback: ed pills gnc
  140. Pingback: sildenafil
  141. Pingback: new ed pills
  142. Pingback: buy chloroquine
  143. Pingback: cialis
  144. Pingback: tadalafil 20 mg
  145. Pingback: pharmacy online
  146. Pingback: t.me/psyhell
  147. Pingback: canada pharmacy
  148. Pingback: Get cialis
  149. Pingback: bitly.com
  150. Pingback: viagra 100mg
  151. Pingback: viagra price
  152. Pingback: viagra coupon
  153. Pingback: levitra generic
  154. Pingback: vardenafil cost
  155. Pingback: affordable viagra
  156. Pingback: natural viagra
  157. Pingback: rlowcostmd.com
  158. Pingback: slot machine games
  159. Pingback: sildenafil generic
  160. Pingback: bitly
  161. Pingback: cash advance
  162. Pingback: viagra prices
  163. Pingback: payday advance
  164. Pingback: personal loan
  165. Pingback: generic ed pills
  166. Pingback: viagra for sale
  167. Pingback: buy cialis
  168. Pingback: new cialis
  169. Pingback: pharmacy
  170. Pingback: cialis generic
  171. Pingback: generic propecia
  172. Pingback: 20 cialis
  173. Pingback: cialis buy
  174. Pingback: cbd oil benefits
  175. Pingback: cialis buy
  176. Pingback: slot machines
  177. Pingback: dom 2
  178. Pingback: online casino usa
  179. Pingback: levitra prices
  180. Pingback: generic ed pills
  181. Pingback: natural viagra
  182. Pingback: online viagra
  183. Pingback: best ed medication
  184. Pingback: moskva-psiholog
  185. Pingback: viagra price
  186. Pingback: metformin
  187. Pingback: batmanapollo.ru
  188. Pingback: 323
  189. Pingback: 525
  190. Pingback: plaquenil for sale
  191. Pingback: dom2-ru
  192. Pingback: order cialis
  193. Pingback: psy psy psy psy
  194. Pingback: propecia online
  195. Pingback: buy sildenafil
  196. Pingback: cialistodo.com
  197. Pingback: viagra
  198. Pingback: viagra
  199. Pingback: buy viagra online
  200. Pingback: krsmi.ru
  201. Pingback: sildenafil
  202. Pingback: generic cialis
  203. Pingback: buy sildenafil
  204. Pingback: Cialis 10 mg nz
  205. Pingback: Cialis 80mg pills
  206. Pingback: like-v.ru
  207. Pingback: propecia 5mg nz
  208. Pingback: actos 15mg canada
  209. Pingback: CFOSPUK
  210. Pingback: amaryl 4mg online
  211. Pingback: buy tadalafil
  212. Pingback: buy generic pills
  213. Pingback: benicar 20mg otc
  214. Pingback: buy cheap viagra
  215. Pingback: cheap casodex 50mg
  216. Pingback: cheap viagra
  217. Pingback: buy ceftin
  218. Pingback: celexa canada
  219. Pingback: viagra
  220. Pingback: cheap viagra
  221. Pingback: claritin australia
  222. Pingback: doubleu casino
  223. Pingback: real casino
  224. Pingback: slot machine games
  225. Pingback: generic cialis
  226. Pingback: real casino online
  227. Pingback: power v8 viagra
  228. Pingback: free slots
  229. Pingback: slots online
  230. Pingback: tadalafil
  231. Pingback: best insurance car
  232. Pingback: batmanapollo
  233. Pingback: best pills for ed
  234. Pingback: usaa car insurance
  235. Pingback: personal loan
  236. Pingback: viagra effect
  237. Pingback: payday loans texas
  238. Pingback: loans online
  239. Pingback: speedy cash
  240. Pingback: viagra offer
  241. Pingback: 44548
  242. Pingback: 44549
  243. Pingback: 300 mg viagra
  244. Pingback: hod-korolevy-2020
  245. Pingback: custom essays
  246. Pingback: buy essay paper
  247. Pingback: cheap viagra no rx
  248. Pingback: my essay writing
  249. Pingback: write essay online
  250. Pingback: HD
  251. Pingback: paper writer
  252. Pingback: write essay online
  253. Pingback: Low cost viagra
  254. Pingback: 158444
  255. Pingback: order clozaril
  256. Pingback: Buy viagra
  257. Pingback: new cialis
  258. Pingback: combivent cheap
  259. Pingback: buy coreg 25mg
  260. Pingback: canadian pharmacy
  261. Pingback: 38QvPmk
  262. Pingback: coumadin coupon
  263. Pingback: matrica-film
  264. Pingback: dzhonuikfilm4
  265. Pingback: buy crestor 10mg
  266. Pingback: cymbalta purchase
  267. Pingback: buy diamox 250 mg
  268. Pingback: order differin 15g
  269. Pingback: cheap diltiazem
  270. Pingback: elavil online
  271. Pingback: geodon tablets
  272. Pingback: hyzaar 12,5mg uk
  273. Pingback: imdur uk
  274. Pingback: buy tadalafil
  275. Pingback: imitrex 100 mg usa
  276. Pingback: tadalafil
  277. Pingback: imodium otc
  278. Pingback: YOURURL.com
  279. Pingback: online viagra
  280. Pingback: pfizer viagra
  281. Pingback: lopid usa
  282. Pingback: micardis pharmacy
  283. Pingback: cleantalkorg2.ru
  284. Pingback: 232dfsad
  285. Pingback: motrin generic
  286. Pingback: Benicar
  287. Pingback: viagra types
  288. Pingback: periactin coupon
  289. Pingback: cheapest phenergan
  290. Pingback: prevacid pills
  291. Pingback: proscar canada
  292. Pingback: cheap pyridium
  293. Pingback: reglan 10 mg cost
  294. Pingback: join vk
  295. Pingback: vk login
  296. Pingback: how to buy remeron
  297. Pingback: rogaine 5% canada
  298. Pingback: seroquel nz
  299. Pingback: singulair for sale
  300. Pingback: skelaxin coupon
  301. Pingback: spiriva australia
  302. Pingback: tricor 160 mg otc
  303. Pingback: valtrex price
  304. Pingback: Google
  305. Pingback: wellbutrin nz
  306. Pingback: zanaflex pharmacy
  307. Pingback: click site
  308. Pingback: zocor tablet
  309. Pingback: how to buy zovirax
  310. Pingback: zyloprim cost
  311. Pingback: zyprexa medication
  312. Pingback: furadantin
  313. Pingback: zyvox canada
  314. Pingback: svaty—7—sezon
  315. Pingback: svaty 7 sezon
  316. Pingback: svaty 7
  317. Pingback: spironolactone usa
  318. Pingback: atomoxetine tablet
  319. Pingback: donepezil usa
  320. Pingback: buspirone cheap
  321. Pingback: cefuroxime nz
  322. Pingback: celecoxib coupon
  323. Pingback: cheap clindamycin
  324. Pingback: clozapine pills
  325. Pingback: gayhub
  326. Pingback: viagra stock
  327. Pingback: 1xbet ng
  328. Pingback: CBD suppositories
  329. Pingback: 메리트카지노
  330. Pingback: موقع كورة
  331. Pingback: Trans Hub Porn
  332. Pingback: pornhd
  333. Pingback: fluconazole cheap
  334. Pingback: phenytoin online
  335. Pingback: GayHub
  336. Pingback: 141genericExare
  337. Pingback: Mining
  338. Pingback: 141generic2Exare
  339. Pingback: prymbuht
  340. Pingback: estradiol canada
  341. Pingback: MILF Porn
  342. Pingback: tiktok
  343. Pingback: amowoljy
  344. Pingback: glipizide tablets
  345. Pingback: 샌즈카지노
  346. Pingback: 메리트카지노
  347. Pingback: 코인카지노
  348. Pingback: sumatriptan pills
  349. Pingback: cost of loperamide
  350. Pingback: anaimmi
  351. Pingback: voyage cma cgm
  352. Pingback: generico cialis
  353. Pingback: buying cialis
  354. Pingback: best cbd gummies
  355. Pingback: cbd oil for dogs
  356. Pingback: best cbd gummies
  357. Pingback: cheap propranolol
  358. Pingback: viagra
  359. Pingback: working visa
  360. Pingback: buy cbd oil
  361. Pingback: essay writer help
  362. Pingback: clubhouse invite
  363. Pingback: BENSEDIN 10MG
  364. Pingback: male masturbation
  365. Pingback: kratom for sale
  366. Pingback: 우리카지노
  367. Pingback: 퍼스트카지노
  368. Pingback: DEATH BUBBA
  369. Pingback: online betting uk
  370. Pingback: amoxicillin 250mg
  371. Pingback: stromectol xl
  372. Pingback: safestore auto
  373. Pingback: metoprolol prices
  374. Pingback: img1
  375. Pingback: doxycycline e coli
  376. Pingback: Hul96S8jSWs
  377. Pingback: christiandogma
  378. Pingback: diflucan iv
  379. Pingback: synthroid 75
  380. Pingback: shutterfly canvas
  381. Pingback: 666
  382. Pingback: click here
  383. Pingback: Herbal incense
  384. Pingback: Herbal incense
  385. Pingback: Bags
  386. Pingback: canada pharmacy
  387. Pingback: virtual card buy
  388. Pingback: 600 neurontin
  389. Pingback: plaquenil and zpak
  390. Pingback: plaquenil wiki
  391. Pingback: bare copper wire
  392. Pingback: vcc buy
  393. Pingback: Canada Pharmacy
  394. Pingback: Service Angels
  395. Pingback: order viagra 25mg
  396. Pingback: The Revenant 2021
  397. Pingback: 2021
  398. Pingback: Vidalista 40mg
  399. Pingback: Guns for sale
  400. Pingback: Web Design Ecuador
  401. Pingback: Human Design 2021
  402. Pingback: 777
  403. Pingback: costi cialis 2016
  404. Pingback: best ed pill
  405. Pingback: online cbd shop
  406. Pingback: Surgical Gloves
  407. Pingback: link
  408. Pingback: seo company
  409. Pingback: 4569987
  410. Pingback: BLUEBERRY WEED
  411. Pingback: cialis 5mg tablet
  412. Pingback: news news news
  413. Pingback: about
  414. Pingback: visit
  415. Pingback: psy
  416. Pingback: best strap on
  417. Pingback: psy2022
  418. Pingback: projectio-freid
  419. Pingback: learn more
  420. Pingback: buy time crisis 4
  421. Pingback: kinoteatrzarya.ru
  422. Pingback: topvideos
  423. Pingback: canada wide
  424. Pingback: female vibrators
  425. Pingback: Vortex Venom
  426. Pingback: bàn học cho bé
  427. Pingback: lisinopril brand
  428. Pingback: Ukrainskie-serialy
  429. Pingback: site
  430. Pingback: top
  431. Pingback: sex toys
  432. Pingback: bdsm toys
  433. Pingback: cumming dildo
  434. Pingback: anal butt plugs
  435. Pingback: best dildos
  436. Pingback: canada pharmacy
  437. Pingback: slot online
  438. Pingback: anal plugs
  439. Pingback: Buy Weed Online
  440. Pingback: dildo for strap on
  441. Pingback: canada cialis
  442. Pingback: hims viagra
  443. Pingback: Cannabis Oil
  444. Pingback: PARROTS FOR SALE
  445. Pingback: ATTA CHAKKI
  446. Pingback: best kratom
  447. Pingback: chelovek-iz-90-h
  448. Pingback: podolsk-region.ru
  449. Pingback: bender na4alo 2021
  450. Pingback: blogery_i_dorogi
  451. Pingback: Cannabis Edibles
  452. Pingback: delta 8 THC
  453. Pingback: delta 8 THC
  454. Pingback: bachelor's degree
  455. Pingback: makeup tutorial
  456. Pingback: pocket pussy
  457. Pingback: buy weed
  458. Pingback: weed near me
  459. Pingback: buy weed
  460. Pingback: buy weed online
  461. Pingback: buy weed
  462. Pingback: abc rifle company
  463. Pingback: ruger guns
  464. Pingback: hemp oil for sale
  465. Pingback: Komunitas obligasi
  466. Pingback: Restaurant
  467. Pingback: MUT
  468. Pingback: website
  469. Pingback: MILF Porn
  470. Pingback: chernaya vodova
  471. Pingback: 66181
  472. Pingback: escort istanbul
  473. Pingback: istanbul escort
  474. Pingback: canadian pharmacy
  475. Pingback: boho coffee table
  476. Pingback: Sig P229
  477. Pingback: Hedgehog For Sale
  478. Pingback: Thc Cartridge
  479. Pingback: Porno
  480. Pingback: vechernyy urgant
  481. Pingback: ukraine
  482. Pingback: best workout sets
  483. Pingback: A3ixW7AS
  484. Pingback: painted sheds
  485. Pingback: ivermectin plus
  486. Pingback: sex toys
  487. Pingback: knalls
  488. Pingback: visit website
  489. Pingback: best software list
  490. Pingback: real glo carts
  491. Pingback: KremlinTeam
  492. Pingback: medunitsa.ru
  493. Pingback: kremlin-team.ru
  494. Pingback: psychophysics.ru
  495. Pingback: canada pharmacy
  496. Pingback: trauma recovery
  497. Pingback: about
  498. Pingback: pocket vagina
  499. Pingback: penis pumps
  500. Pingback: asmr porn
  501. Pingback: esenyurt escort
  502. Pingback: canada pharmacy
  503. Pingback: latest news
  504. Pingback: viagra costs
  505. Pingback: happyluke
  506. Pingback: tuzla escort
  507. Pingback: male p spot toys
  508. Pingback: mersin escort
  509. Pingback: ed help
  510. Pingback: regcialist.com
  511. Pingback: ivermectin plus
  512. Pingback: lasix in mexico
  513. Pingback: generic lasix
  514. Pingback: neurontin
  515. Pingback: plaquenil 250
  516. Pingback: plaquenil 50mg
  517. Pingback: 120 mg prednisone
  518. Pingback: priligy generic
  519. Pingback: provigil india buy
  520. Pingback: stromectol ireland
  521. Pingback: stromectol canada
  522. Pingback: ventolin uk
  523. Pingback: zithromax 1000mg
  524. Pingback: cialis not working
  525. Pingback: aabbx.store
  526. Pingback: ne-smotrite-naverx
  527. Pingback: cvs cialis price
  528. Pingback: arrogant
  529. Pingback: Dead-Inside
  530. Pingback: cialis prices
  531. Pingback: girl viagra
  532. Pingback: cheap viagra
  533. Pingback: cialis tabletas
  534. Pingback: viagra pill
  535. Pingback: chloroquine uk
  536. Pingback: zanaflex coupon
  537. Pingback: merck covid drug
  538. Pingback: lumigan uses
  539. Pingback: order ivermectin
  540. Pingback: ivermectin humans
  541. Pingback: lumigan walmart
  542. Pingback: ivermectin price
  543. Pingback: ivermectin kaufen
  544. Pingback: cialis dosis
  545. Pingback: molpunavir
  546. Pingback: tadalafil cost cvs
  547. Pingback: ivermectin 400 mg
  548. Pingback: stromectol 15 mg
  549. Pingback: z.globus-kino.ru
  550. Pingback: celebrex mood
  551. Pingback: ivermectin 6mg otc
  552. Pingback: madridbet
  553. Pingback: meritking
  554. Pingback: ielexusbet
  555. Pingback: trcasino
  556. Pingback: meritroyalbet
  557. Pingback: eurocasino
  558. Pingback: pc games download
  559. Pingback: crazy tiger
  560. Pingback: Beretta 92fs
  561. Pingback: ivermectin 9 mg
  562. Pingback: male stroker
  563. Pingback: clitoral vibrator
  564. Pingback: madridbet
  565. Pingback: golden bullet
  566. Pingback: luckylandslots com
  567. Pingback: Uganda safari tour
  568. Pingback: Glock 19 for sale
  569. Pingback: stromectol drug
  570. Pingback: canadian business
  571. Pingback: Krt vape
  572. Pingback: cash for cars
  573. Pingback: buy stromectol uk
  574. Pingback: FLINTLOCK PISTOL
  575. Pingback: ps5 on sale
  576. Pingback: penis sleeve
  577. Pingback: Takeout Food
  578. Pingback: zwitsal
  579. Pingback: eurocasino
  580. Pingback: junk car removal
  581. Pingback: visit podcast
  582. Pingback: child porn
  583. Pingback: Latest News
  584. Pingback: wavy bar chocolate
  585. Pingback: Platinum haupia
  586. Pingback: Platinum haupia
  587. Pingback: Bubble hash
  588. Pingback: Moroccan hash
  589. Pingback: Litto
  590. Pingback: psy-
  591. Pingback: madridbet
  592. Pingback: eurocasino
  593. Pingback: meritroyalbet
  594. Pingback: bahis siteleri
  595. Pingback: DPTPtNqS
  596. Pingback: qQ8KZZE6
  597. Pingback: D6tuzANh
  598. Pingback: hdorg2.ru
  599. Pingback: Psychologists
  600. Pingback: netstate.ru
  601. Pingback: 1thrifty
  602. Pingback: meritroyalbet
  603. Pingback: bit.ly
  604. Pingback: sildenafil
  605. Pingback: stats
  606. Pingback: revatio
  607. Pingback: stromectol buy
  608. Pingback: web
  609. Pingback: film.8filmov.ru
  610. Pingback: 20mg cialis
  611. Pingback: cialis walmart
  612. Pingback: Anonyme
  613. Pingback: filmgoda.ru
  614. Pingback: psikholog moskva
  615. Pingback: porno}
  616. Pingback: pornoizle}
  617. Pingback: A片
  618. Pingback: meriking
  619. Pingback: film onlinee
  620. Pingback: sezons.store
  621. Pingback: 3DGofO7
  622. Pingback: Google
  623. Pingback: rftrip.ru
  624. Pingback: madridbet
  625. Pingback: dolpsy.ru
  626. Pingback: meritking
  627. Pingback: site 2023
  628. Pingback: grandpashabet
  629. Pingback: MUT
  630. Pingback: 1c789.ru
  631. Pingback: cttdu.ru
  632. Pingback: bit.ly/3OEzOZR
  633. Pingback: Grandpashabet
  634. Pingback: bep5w0Df
  635. Pingback: icf
  636. Pingback: 24hours-news
  637. Pingback: rusnewsweek
  638. Pingback: uluro-ado
  639. Pingback: irannews.ru
  640. Pingback: klondayk2022
  641. Pingback: madridbet
  642. Pingback: meritking
  643. Pingback: meritking
  644. Pingback: fuck google
  645. Pingback: sikiş
  646. Pingback: fuvk google
  647. Pingback: fuck google
  648. Pingback: madridbet
  649. Pingback: anal porno
  650. Pingback: xxx
  651. Pingback: madridbet
  652. Pingback: buy femara 2.5 mg
  653. Pingback: elexusbet
  654. Pingback: ギャンブル
  655. Pingback: madridbet
  656. Pingback: meritking
  657. Pingback: madridbet
  658. Pingback: buy some cialis
  659. Pingback: samsung headphones
  660. Pingback: meritking
  661. Pingback: сука пари
  662. Pingback: child porn
  663. Pingback: future university
  664. Pingback: fue
  665. Pingback: ???? ????????
  666. Pingback: porn
  667. Pingback: stromectol tablets
  668. Pingback: grandpashabet
  669. Pingback: MSc in pharmacy
  670. Pingback: Technical Writer
  671. Pingback: fue contact
  672. Pingback: meritking
  673. Pingback: izmir escort
  674. Pingback: fuck google
  675. Pingback: sms onay
  676. Pingback: sms onay
  677. Pingback: steroid satın al
  678. Pingback: child porn
  679. Pingback: porn
  680. Pingback: ozempic

Comments are closed.

Cooling time of an Induction motor

Cooling status is referred to the condition defined by a motor temperature reduction caused by a decreasing current from running condition to a less than the Full Load Amps (FLA)​​ condition known as minimum running condition. The cooling status is also initiated by a stopped motor following a running condition.

Motor thermal status, also referred as motor thermal capacity is a parameter used to evaluate the thermal condition of the​​ motor.

Thermal status is measured in percentage of the motor thermal limit. When a motor is stopped for a long time, the thermal status is 0% which means that zero percent of its capacity is used. At motor starting, the thermal capacity used can reach let's said 40%. If the motor has two cold starts, then the thermal capacity after these actions would be 80%. Exceeding the thermal capacity of the motor produces a loss of insulation life due to deterioration by overheating the windings.​​ 

During the cooling time, the thermal status decreases from a higher running thermal status to a lower one.

The equation of the cooling motor is given by:

θactual=θfinal+θinitial-θfinale-t/τ

where:

θinitial:​​ Thermal status at the start of the cooling period (t= 0) in percent

θfinal   :​​ Thermal status at the end of the cooling period (t → ꝏ) in percent

θactual:​​ Thermal status after time​​ t​​ in percent

t           :​​ Time in seconds

τ           :​​ Cooling time constant in seconds

Thermal status is proportional to I squared and the equation can be expressed in the following form:​​ 

I2(t)=I2f+I20-I2fe-t/τ

where:

I20:​​ Motor current squared at the start of the cooling period (t= 0) in per unit (pu)

I2f :​​ Motor current squared at the end of the cooling period (t → ꝏ) in pu

I2(t):​​ Motor current squared after time​​ t​​ in pu

t      :​​ Time in seconds

τ      :​​ Cooling time constant in seconds

 

Example

A motor with a cooling time​​ constant of 3.5 hours is stopped with a thermal status of 90%. Calculate the time required to reach 40% motor status.

 

Replacing the data in the first equation gives:

40=0+90-0e-t/12600

t=-12600 ln4090=10217 s

The required time is 2 hours 50 minutes.

The curve below shows the motor thermal status​​ variation with time for this example.​​  

Ernesto Hidalgo-Tupia, Eng., M. A. Sc.​​ 
Electrical Engineer

 

 

 

pdf3 Download PDF

538 thoughts on “Cooling time of an Induction motor

  1. Pingback: cialis 20mg price
  2. Pingback: cialis india
  3. Pingback: doctor7online.com
  4. Pingback: cialis otc
  5. Pingback: natural viagra
  6. Pingback: naltrexone otc
  7. Pingback: cialis 5mg
  8. Pingback: buy generic cialis
  9. Pingback: buy careprost
  10. Pingback: viagra generic
  11. Pingback: buy tylenol
  12. Pingback: buy chloroquine
  13. Pingback: pharmacy online
  14. Pingback: generic cialis
  15. Pingback: vardenafil coupon
  16. Pingback: online casino
  17. Pingback: pay day loans
  18. Pingback: instant loans
  19. Pingback: personal loans
  20. Pingback: viagra for sale
  21. Pingback: casino online usa
  22. Pingback: cialis 5 mg
  23. Pingback: generic cialis
  24. Pingback: viagra 10mg 20mg
  25. Pingback: cialis buy
  26. Pingback: cialis to buy
  27. Pingback: cialis internet
  28. Pingback: casinos online
  29. Pingback: real casino online
  30. Pingback: casino game
  31. Pingback: viagra prices
  32. Pingback: buy viagra on line
  33. Pingback: brand viagra
  34. Pingback: buy viagra uk
  35. Pingback: cialis 5mg
  36. Pingback: viagra buy
  37. Pingback: generic propecia
  38. Pingback: buy viagra online
  39. Pingback: buy viagra online
  40. Pingback: cialis purchase
  41. Pingback: buy sildenafil
  42. Pingback: cheap viagra
  43. Pingback: cheap sildenafil
  44. Pingback: sildenafil pills
  45. Pingback: cialis
  46. Pingback: cialis
  47. Pingback: Cialis 80mg tablet
  48. Pingback: viagra
  49. Pingback: Cialis 40 mg cheap
  50. Pingback: Cialis 10mg usa
  51. Pingback: amaryl 1mg price
  52. Pingback: cheap arava 10mg
  53. Pingback: generic cialis
  54. Pingback: tamoxifen 20 mg uk
  55. Pingback: generic cialis uk
  56. Pingback: atarax 25 mg nz
  57. Pingback: non generic viagra
  58. Pingback: baclofen 25mg otc
  59. Pingback: benicar 10mg price
  60. Pingback: cvs viagra cost
  61. Pingback: cialis for sale
  62. Pingback: ceftin 250 mg otc
  63. Pingback: celexa canada
  64. Pingback: buy viagra online
  65. Pingback: claritin 10mg usa
  66. Pingback: online slots
  67. Pingback: online casino
  68. Pingback: online casino
  69. Pingback: casino slot
  70. Pingback: red dog casino
  71. Pingback: doubleu casino
  72. Pingback: generic viagra
  73. Pingback: pala casino online
  74. Pingback: casino gambling
  75. Pingback: viagra warnings
  76. Pingback: cialisorgcom
  77. Pingback: cialis
  78. Pingback: cialis
  79. Pingback: canada ed drugs
  80. Pingback: quick loans texas
  81. Pingback: cialis online
  82. Pingback: cbd cannabis oil
  83. Pingback: cialis online
  84. Pingback: cbd cannabis
  85. Pingback: Get viagra fast
  86. Pingback: viagra 10 mg
  87. Pingback: online essay
  88. Pingback: assignment helps
  89. Pingback: how to buy cleocin
  90. Pingback: cialis opisanie
  91. Pingback: 50mg viagra
  92. Pingback: clozaril canada
  93. Pingback: order colchicine
  94. Pingback: cialis gel tabs
  95. Pingback: buy viagra fast
  96. Pingback: coumadin nz
  97. Pingback: viagra pills 50mg
  98. Pingback: cozaar purchase
  99. Pingback: crestor tablet
  100. Pingback: cymbalta 40mg nz
  101. Pingback: ddavp otc
  102. Pingback: diamox usa
  103. Pingback: differin online
  104. Pingback: doxycycline nz
  105. Pingback: etodolac otc
  106. Pingback: flomax 0,4 mg uk
  107. Pingback: imdur 20 mg tablet
  108. Pingback: imitrex prices
  109. Pingback: cialis for sale
  110. Pingback: review
  111. Pingback: read the article
  112. Pingback: imuran 50 mg cost
  113. Pingback: lamisil australia
  114. Pingback: lopressor prices
  115. Pingback: luvox pharmacy
  116. Pingback: cheap macrobid
  117. Pingback: mestinon cheap
  118. Pingback: Microzide
  119. Pingback: viagra tablets
  120. Pingback: plaquenil nz
  121. Pingback: proscar 5 mg pills
  122. Pingback: provigil coupon
  123. Pingback: pulmicort cheap
  124. Pingback: reglan coupon
  125. Pingback: revatio 20 mg uk
  126. Pingback: risperdal for sale
  127. Pingback: robaxin cost
  128. Pingback: cost of singulair
  129. Pingback: spiriva purchase
  130. Pingback: vantin medication
  131. Pingback: zanaflex 4 mg usa
  132. Pingback: additional hints
  133. Pingback: zyvox 600mg nz
  134. Pingback: sildenafil generic
  135. Pingback: furosemide prices
  136. Pingback: pioglitazone uk
  137. Pingback: buy spironolactone
  138. Pingback: buy fexofenadine
  139. Pingback: atomoxetine canada
  140. Pingback: cefuroxime uk
  141. Pingback: citalopram usa
  142. Pingback: cost of loratadine
  143. Pingback: order clindamycin
  144. Pingback: clozapine generic
  145. Pingback: cialis in europe
  146. Pingback: cheap warfarin
  147. Pingback: phenytoin prices
  148. Pingback: qclqkxxc
  149. Pingback: estradiol 2 mg nz
  150. Pingback: tamsulosin coupon
  151. Pingback: orxtmagt
  152. Pingback: alendronate otc
  153. Pingback: where viagra buy
  154. Pingback: sumatriptan usa
  155. Pingback: cialis
  156. Pingback: write my essay
  157. Pingback: amoxicillin 650 mg
  158. Pingback: furosemide cost
  159. Pingback: buying zithromax
  160. Pingback: clomid vs arimidex
  161. Pingback: propecia.
  162. Pingback: paxil irritability
  163. Pingback: plaquenil online
  164. Pingback: propecia pills
  165. Pingback: buy cialis drug
  166. Pingback: new ed treatments
  167. Pingback: ed pills
  168. Pingback: Zakhar Berkut hd
  169. Pingback: 4569987
  170. Pingback: buy united kingdom
  171. Pingback: news news news
  172. Pingback: can i buy online
  173. Pingback: psy
  174. Pingback: psy2022
  175. Pingback: projectio-freid
  176. Pingback: kinoteatrzarya.ru
  177. Pingback: video
  178. Pingback: zestoretic 20 mg
  179. Pingback: Ukrainskie-serialy
  180. Pingback: site
  181. Pingback: top
  182. Pingback: pakistan cialis
  183. Pingback: Chloromycetin
  184. Pingback: valtrex cost uk
  185. Pingback: cheapest ed pills
  186. Pingback: podolsk-region.ru
  187. Pingback: blogery_i_dorogi
  188. Pingback: plaquenil brand
  189. Pingback: ed in young men
  190. Pingback: viagra online usa
  191. Pingback: zithromax tablets
  192. Pingback: regcialist.com
  193. Pingback: ivermectin gel
  194. Pingback: plaquenil 10 mg

Comments are closed.