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# Re: [FEMM] [cogging torque problem???]

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- Subject: Re: [FEMM] [cogging torque problem???]
- From: David Meeker <dmeeker@ieee.org>
- Date: Mon, 26 Apr 2004 21:30:49 -0400
- In-reply-to: <20040427084040.HM.000000000007xG4@wwl277.hanmail.net>
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> `Dear everyone,`
> `My name is Kang in South Korea. I designed a BLDC motor 5 days ago. For the analysis of cogging torque , I am using FEMM and LUA.`
> `In my process, there is a problem. Cogging result is unusual and very spiky. I want to know its reason and solution.(Why???) Could any one help me please?`

``
`I think that the cogging torque for the machine that you've drawn is exactly zero. Any non-zero torque that you'd calculate for this machine is essentially numerical "noise" whose amplitude is a function of the mesh density (i.e. the resulting torque will be closer and closer to zero as you specify a finer and finer mesh).`
`Dave.`

    --
    David Meeker
    dmeeker@ieee.org
    http://femm.berlios.de/dmeeker

- References:
  - [FEMM] [cogging torque problem???]
    - From: "강경호" <khmr@hanmail.net>

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