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# Torque calculation (2)

- To: <femm@yahoogroups.com>
- Subject: Torque calculation (2)
- Date: Mon, 20 May 2002 13:08:10 +0200
- Thread-index: AcH/7qDewyQPrhm4QSatH7MVXjCoTQ==
- Thread-topic: Torque calculation (2)

    Hello everybody,

    I have two questions related to the Torque calculation in a microengine that I presented in this forum some 10 days ago and that David Meeker helped with. I include his file for those interested.

    First question: I have been informed that our microengine will have AC current. I guess it will be 50 Hz frecuency. Are the calculation that I made valid? Should I change sometthing?

    Second question: The current density that David chosed was, by some kind ofmagic, very appropiate for our microengine: we are looking for a torque of0.0020 N*m per unit meter lenght, and with the 10 MA/m^2 current density that David chosed, we obtained a 0.0015 N*m per unit meter lenght torque. Quite close. However I am confused about the calculation of the intensity that will go through the coils. Is the intensity just the product of the current density by the area I have modeled in the FEMM program? This will be 10 MA/m^2 multiplied by 0.263873 mm^2 == 2.64 Amperes, which seems to be a lot. Am I missing something, perhaps the number of coils? For instance, if thenumber of coils is 20, the intensity would be 0.132 Amperes? I have been told that this is a much more reasonable value of intensity for our micro engine. I am mantaining the same geometric configuration

    Thank you very much in advance.

    Iñaki Garmendia
    <<mag03a.zip>>

Attachment: `zip00026.zip`
Description: mag03a.zip

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