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shiva_pvv@yahoo.co.in
Active Contributor

Join Date: Jul 2008
Posts: 11

drives

07/18/2008 1:33 AM

hi friends............this is chaitanya btech

I have a dought in drives that"In ac drives "how would a drive know that motor is in run mode.(i.e how could drive can get feedback from ac motor.In dc motor it will know from tacho generator,but in ac motor,how"?please give me a confident answer
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Divyesh patel
Associate

Join Date: Jul 2008
Posts: 37
#1

Re: drives

07/18/2008 7:04 AM

hi

tech generator is independent of motor wheathere it is ac or dc, as it is mechanical part which connectes on the shaft of the motor.

so for a drive run mode is detected through tech generator for both ac and dc motor

regards

divyesh patel
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Anonymous Poster
#2

motors rotation 490 mc/h?

07/18/2008 7:41 AM

Who know, my motors rotation 490 mc/h (loaded), how much is his power, and how much is wire cross-section for it, please tell me?
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JRaef
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United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
Posts: 4665
Good Answers: 804
#3

Re: drives

07/19/2008 2:01 AM

A VFD knows the motor's operating status by monitoring the current.

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vishvnath
Member

Join Date: May 2008
Posts: 7
#4

Re: drives

07/19/2008 1:09 PM

Dear sir, Encoders are used for feedback of ac drives, we are using the same in ac drive of YASKAWA.
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Anonymous Poster
#5

Re: drives

07/19/2008 7:39 PM

What kind of VFD are you using, some drives use encoder feedback or in cases where one VFD is controlling several motors contactor feedback can be used with an aux contactor.
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shiva_pvv@yahoo.co.in
Active Contributor

Join Date: Jul 2008
Posts: 11
#6
In reply to #5

bulb

08/25/2008 11:01 AM

i have a dought.......when u r seeing all the 3 phases haelthy with 2 lamps between 2 phases of 440 volts.why the bulb is glowing and where to the pasage of current as those 2 phases indptly has 230v with respect to earth.?
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Users who posted comments:

Anonymous Poster (2); Divyesh patel (1); JRaef (1); shiva_pvv@yahoo.co.in (1); vishvnath (1)

Previous in Forum: automatic servo stabilizers   Next in Forum: BLDC motor speed calculation
You might be interested in: AC Motor Drives, DC Motor Drives, AC Motor Starters

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