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Re: [femm] torque calculation example

To: femm@xxxxxxxxxxxxxxx
Subject: Re: [femm] torque calculation example
From: Dave Squires <djsquires@xxxxxxxx>
Date: Wed, 19 Mar 2003 10:27:32 -0800
References: <b5a8s5+rs2d@eGroups.com>
User-agent: Mozilla/5.0 (Windows; U; Win 9x 4.90; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0

Here is a simple 2-pole motor example.
Juan,
Here is a very simple example.
There are other ways, of course, but maybe
this is good enough?

No special boundary conditions are used.
The mesh is 0.02" between the rotor and stator
magnets. Units are inches.

Once simulated use FEMMVIEW then left click on
the center contour line between the rotor and
stator magnets going clockwise.
Then click on the integrate->torque
from stress tensor selection.

The gap is large to make it simple and so it
runs fast. I used version 3.2.

I hope this helps.

DRS

penquista66 wrote:

Hi Femm people

I'm wondering if anyone can send a simple torque example calculation. I'm teaching an electromechanical energy conversion class and I'll be very interested to show to my students the procedure to calculate torque using FEMM with a simple example.

Thanks

Juan A.

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

[Format] = 3.0
[Frequency] = 0
[Precision] = 1e-008
[LengthUnits] = centimeters
[ProblemType] = planar
[Coordinates] = cartesian
[Comment] = "Add comments here."
[PointProps] = 2
<BeginPoint>
<PointName> = "plus"
<I_re> = 1
<I_im> = 0
<A_re> = 0
<A_im> = 0
<EndPoint>
<BeginPoint>
<PointName> = "minus"
<I_re> = -1
<I_im> = 0
<A_re> = 0
<A_im> = 0
<EndPoint>
[BdryProps] = 0
[BlockProps] = 3
<BeginBlock>
<BlockName> = "Air"
<Mu_x> = 1
<Mu_y> = 1
<H_c> = 0
<H_cAngle> = 0
<J_re> = 0
<J_im> = 0
<Sigma> = 0
<d_lam> = 0
<Phi_h> = 0
<LamType> = 0
<LamFill> = 1
<BHPoints> = 0
<EndBlock>
<BeginBlock>
<BlockName> = "NdFeB 37 MGOe"
<Mu_x> = 1.048
<Mu_y> = 1.048
<H_c> = 950000
<H_cAngle> = 0
<J_re> = 0
<J_im> = 0
<Sigma> = 0.66700000000000004
<d_lam> = 0
<Phi_h> = 0
<LamType> = 0
<LamFill> = 1
<BHPoints> = 0
<EndBlock>
<BeginBlock>
<BlockName> = "M-19 Steel"
<Mu_x> = 4416
<Mu_y> = 4416
<H_c> = 0
<H_cAngle> = 0
<J_re> = 0
<J_im> = 0
<Sigma> = 0
<d_lam> = 0
<Phi_h> = 0
<LamType> = 0
<LamFill> = 1
<BHPoints> = 13
0	0
0.29999999999999999	39.78875
0.80000000000000004	79.577500000000001
1.1200000000000001	159.155
1.3200000000000001	318.31
1.46	795.77499999999998
1.54	1591.55
1.6187499999999999	3376.6669999999999
1.74	7957.75
1.8700000000000001	15915.5
1.99	31831
2.0459640000000001	55102.040000000001
2.0800000000000001	79577.5
<EndBlock>
[CircuitProps] = 0
[NumPoints] = 170
0.70710678118654746	0.70710678118654757	0	1
-0.70710678118654746	-0.70710678118654757	0	1
0.70710678118654757	-0.70710678118654746	0	1
-0.70710678118654757	0.70710678118654746	0	1
1.0625	0	0	0
0	1.0625	0	0
-1.0625	0	0	0
0.70710678118654746	5.5511151231257827e-017	0	1
0	0.70710678118654746	0	1
-0.70710678118654746	5.5511151231257827e-017	0	1
-5.5511151231257827e-017	-0.70710678118654746	0	1
0	1.0000000000000004	0	1
1.0000000000000004	0	0	1
-1.0000000000000002	0	0	1
-1.1102230246251565e-016	-1	0	1
0.79549512883486606	0.79549512883486595	0	0
-0.79549512883486595	0.79549512883486606	0	0
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0	-1.0625	0	0
0.79549512883486595	-0.79549512883486606	0	0
-0.088388347648318447	0.088388347648318433	0	1
0.088388347648318447	-0.088388347648318433	0	1
0.088388347648318433	0.088388347648318447	0	1
-0.088388347648318433	-0.088388347648318447	0	1
0.97227182413150293	0.9722718241315027	0	0
-0.97227182413150259	0.97227182413150304	0	0
-0.97227182413150304	-0.97227182413150259	0	0
0.97227182413150248	-0.97227182413150315	0	0
1.875	0	0	0
1.1480684567084787e-016	1.875	0	0
-1.875	2.2961369134169574e-016	0	0
-3.444205370125436e-016	-1.875	0	0
2.125	0	0	0
-2.125	2.6022885018725517e-016	0	0
-0.13258252147247773	0.66291260736238833	1	1
-0.0441941738241593	0.75130095501070682	1	1
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-0.17677669529663692	0.70710678118654746	1	1
-0.22097086912079614	0.66291260736238833	1	1
-0.26516504294495535	0.61871843353822908	1	1
-0.3093592167691146	0.57452425971406984	1	1
-0.35355339059327379	0.5303300858899106	1	1
-0.39774756441743297	0.48613591206575141	1	1
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-0.48613591206575146	0.39774756441743292	1	1
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-0.61871843353822908	0.26516504294495524	1	1
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-0.3093592167691146	0.48613591206575141	1	1
-0.26516504294495535	0.53033008588991071	1	1
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-0.17677669529663695	0.61871843353822908	1	1
0.75130095501070682	-0.044194173824159189	2	1
0.79549512883486595	-0.088388347648318377	2	1
0.75130095501070671	-0.13258252147247762	2	1
0.70710678118654746	-0.088388347648318433	2	1
0.66291260736238833	-0.13258252147247762	2	1
0.70710678118654746	-0.17677669529663681	2	1
0.66291260736238833	-0.22097086912079605	2	1
0.61871843353822908	-0.26516504294495524	2	1
0.57452425971406984	-0.30935921676911449	2	1
0.53033008588991071	-0.35355339059327373	2	1
0.48613591206575146	-0.39774756441743292	2	1
0.44194173824159222	-0.44194173824159216	2	1
0.39774756441743297	-0.48613591206575141	2	1
0.35355339059327379	-0.5303300858899106	2	1
0.3093592167691146	-0.57452425971406984	2	1
0.26516504294495535	-0.61871843353822908	2	1
0.22097086912079614	-0.66291260736238833	2	1
0.17677669529663692	-0.70710678118654746	2	1
0.13258252147247773	-0.75130095501070671	2	1
0.088388347648318488	-0.79549512883486595	2	1
0.0441941738241593	-0.75130095501070682	2	1
0.13258252147247773	-0.66291260736238833	2	1
0.17677669529663695	-0.61871843353822908	2	1
0.22097086912079617	-0.57452425971406984	2	1
0.088388347648318544	-0.70710678118654746	2	1
0.26516504294495535	-0.53033008588991071	2	1
0.35355339059327384	-0.44194173824159222	2	1
0.3093592167691146	-0.48613591206575141	2	1
0.39774756441743303	-0.39774756441743297	2	1
0.44194173824159222	-0.35355339059327373	2	1
0.48613591206575146	-0.30935921676911454	2	1
0.53033008588991071	-0.2651650429449553	2	1
0.57452425971406984	-0.22097086912079608	2	1
0.61871843353822908	-0.17677669529663687	2	1
-0.13258252147247773	0.83968930265902508	1	1
-0.17677669529663698	0.79549512883486595	1	1
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-0.26516504294495535	0.70710678118654746	1	1
-0.3093592167691146	0.66291260736238822	1	1
-0.35355339059327384	0.61871843353822897	1	1
-0.39774756441743303	0.57452425971406984	1	1
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-0.53033008588991071	0.44194173824159211	1	1
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0.83968930265902519	-0.13258252147247757	2	1
0.79549512883486595	-0.17677669529663681	2	1
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0.70710678118654757	-0.26516504294495524	2	1
0.66291260736238833	-0.30935921676911449	2	1
0.61871843353822908	-0.35355339059327368	2	1
0.57452425971406984	-0.39774756441743292	2	1
0.53033008588991071	-0.44194173824159211	2	1
0.48613591206575146	-0.48613591206575135	2	1
0.44194173824159222	-0.5303300858899106	2	1
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0.88388347648318444	-0.17677669529663681	2	1
0.83968930265902519	-0.22097086912079605	2	1
[NumSegments] = 10
11	8	-1	0	0	1
12	7	-1	0	0	1
7	10	-1	0	0	1
8	9	-1	0	0	1
9	13	-1	0	0	1
10	14	-1	0	0	1
24	15	-1	0	0	0
25	16	-1	0	0	0
26	17	-1	0	0	0
19	27	-1	0	0	0
[NumArcSegments] = 30
0	11	44.999999999999993	2	0	0	1
3	13	44.999999999999993	2	0	0	1
1	14	44.999999999999986	2	0	0	1
2	12	44.999999999999993	2	0	0	1
11	3	45	2	0	0	1
12	0	45	2	0	0	1
13	1	45.000000000000007	2	0	0	1
14	2	45.000000000000007	2	0	0	1
15	16	90	2	0	0	0
16	17	90	2	0	0	0
17	19	90	2	0	0	0
19	15	90	2	0	0	0
18	4	90	2	0	0	0
4	5	90	2	0	0	0
5	6	90	2	0	0	0
6	18	90	2	0	0	0
20	23	90	10	0	0	0
23	21	90	10	0	0	0
21	22	90	10	0	0	0
22	20	90	10	0	0	0
24	25	90	10	0	0	0
32	33	180	10	0	0	0
33	32	180	10	0	0	0
28	29	90	10	0	0	0
29	30	90	10	0	0	0
30	31	90	10	0	0	0
31	28	90	10	0	0	0
26	27	90	10	0	0	0
25	26	90	10	0	0	0
27	24	90	10	0	0	0
[NumHoles] = 0
[NumBlockLabels] = 12
0.044194173824159216	0.044194173824159223	1	0.10000000000000001	0	0	1
1	0.25	1	0.02	0	0	0
1.0625	0.25	1	0.02	0	0	0
0.35355339059327373	0.35355339059327379	3	0.10000000000000001	0	0	1
0	1.25	2	0.10000000000000001	0	90	0
0	-1.25	2	0.10000000000000001	0	90	0
-0.6875	0.625	1	0.10000000000000001	0	0	1
0	1.625	3	0.10000000000000001	0	0	0
1.25	0	1	0.10000000000000001	0	0	0
-1.25	0	1	0.10000000000000001	0	0	0
2	0	1	-1	0	0	0
0.625	-0.625	1	0.10000000000000001	0	0	1

Follow-Ups:
- RE: [femm] torque calculation example
  - From: Juan Tapia

References:
- torque calculation example
  - From: penquista66

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