How to Specify a Variable Frequency Drive

Posted by Luke Lancaster 20/03/2014 5 Comment(s)

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5 Comment(s)

David Williams:
15/11/2017, 03:54:41 AM

How can we apply variable frequency to inductive motor ( i.e. submersible pump 3 phase 5 hp – 50 hp)These motors have one speed, could you vary the speed..
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David Williams:
28/10/2017, 01:05:36 AM

Very Excellent explanation which can be understand by every one. Thank you for creating this blog. One of the most interesting articles in this category that I have every read!You kept the technology on a good level. Keep up the good work.
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Raj Kumar Tyagi:
21/08/2017, 04:58:52 AM

Looking 6"shaft bearing current protection ring
Pls quote along with accessories & installation instructions
Rake Tyagi

11/10/2016, 08:10:51 PM

Dear sir, we need a VFD for 50-1200 Hz, for 100 KW, 1 phase

Yin (Admin):
12/10/2016, 04:35:11 PM

Hi Carlos,

If you have a single phase motor, VFDs will not work.

If you have a three phase motor with single phase power, you will need find a 3 phase VFD that is twice as big in amps (to the motor) for it to work. This process is called derating. Because manufacturers do not make single phase VFD that big.

For example, if your 100kW motor has an FLA of 180A, you will typically need a VFD with 360A or higher for it to work. Does that make sense? Can you tell me what is your application?

Dennis TITUS:
09/08/2016, 10:45:06 PM

Hello I am trying to identify a unit that will convert 50htz cycle to 60htz cycle same 110-120 volts. I bought some clipper here to take to the Caribbean the clipper are 60 htz cycle but the power there is 110-120v @ 50 htz Making the clippers very noisy because of the magnetic vibrating arm that they use. If you don't do such a small unit can you point in a direction or even a schematic where I can make or get it made. Thank you very much