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bob14
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Joined: 16-December 08
Profile Views: 275*
Last Seen: 21st June 2010 - 06:21 AM
Local Time: Sep 3 2010, 05:56 PM
15 posts (0.02 per day)
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7 Jun 2010
Hi,
We are replacing a relatively lower inertia load by a higher one and still keeping the same wound motor and starter.The rotoric starter consists of multiple steps of shorting resistors. I am worried that the motor would still be capable of starting the load.I have got the moment inertia of the new load but as the slip ring motor is very old, built in the 70's, I don't have any data on the starting torque and locked rotor current. The motor is a 236 kW 400 V 50 Hz one. My questions are as follows: 1. What typical value I could use for the averaged starting torque ? 2. What is the maximum starting time that the rotor would tolerate ? Thanks. Bob
6 May 2010
Hi,
I'm looking for typical values of full load slip of squirrel cage motors. A manufacturer is quoting a value of 0.06 % which seems to be very low. Bob
29 Nov 2009
Hi,
We are planning to install a dozen of VSDs, 7.5 kW 400 V, on a new site. The panel powering the VSDs are loaded with a power factor correction capacity bank. The bank is permanently powered. Having been through the forum, I am wondering how the local capacity bank could affect the performance of the VSDs. The VSDs are of the Siemens micomaster type. Thanks. Bob
10 Nov 2009
Hi,
I am wondering on the effect of running LV motors designed for 380 V operation on 415 V supply. I presume the voltqge rise 9 % should be insignificant. The motor would be slightly overfluxed but should run with less losses. Any comment. Bob
1 Nov 2009
Hi,
I have a 500 kW 400 V slip ring motor driving a load. The current drawn by the motor without load but still couple to the drive is very high, 750 Amps. This is too high for an unloaded motor. This should be the current drawn under loading conditions. What basically could be cause of the high current ? Thanks. Bob |
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Lo-Fi Version | Time is now: 3rd September 2010 - 04:56 PM |
5 Nov 2009 - 16:41