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Time Constants Of Indution Motor |
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 Jul 29 2008, 04:48 PM
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Junior Member  Group: Members Posts: 4 Joined: 3-August 07 From: INDIA Member No.: 3,571  |
what are heating time constant & cooling time constant of induction motors.
-------------------- Regads,
Bonny |
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Jul 29 2008, 06:37 PM
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#2
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Posting Freak Group: Moderator Posts: 2,383 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
Hello bonny
This varies considerably between motors as is reflected by the maximum Locked Rotor Time of motors. The maximum LR time for some motors can be as low as 5 - 10 seconds, and others as high as 40 - 50 seconds. To accommodate this variation, most good protection relays have a setting that reflects this value. The cooling time constant is likewise very variable and is dependent on whether the motor is running or not. While it is running, there is additional heat input, and additional cooling compared to a stationary motor. Best regards, Mark. -------------------- Mark Empson administrator
Skype Contact = markempson | phone +64 274 363 067 LMPForum | LMP Tech Warehouse | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | LMP Software | Mark Empson Website |
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Aug 14 2008, 11:12 AM
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#3
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 Intermediate Member Group: Full Member Posts: 13 Joined: 18-May 07 From: Somewhere Down Under there Member No.: 3,279 |
From what I know, the cooling time constant is the time required for the motor to cool down to ambient temperature from hot.
This information is not critical to motor protection but maybe required as a input to the motor protection module you are using. This cooling time constant can be obtained from your motor manufacturer. It can be something like 60-120mins depending on the design. SCIM |
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