09 Airgap Magnetic Field

09 Airgap Magnetic - irgap agnetic Field Airgap Magnetic Field Effective Airgap(1 The permeance P g over the slot pitch of width s is made up of

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: irgap agnetic Field Airgap Magnetic Field Effective Airgap (1) The permeance P g over the slot pitch of width s is made up of two parts: (a) the permeance P 1 between the unslotted surface and the top of the tooth, and (b) the permeance 2 P 2 where P 2 is the permeance between the unslotted surface and one side of the tooth. l b s s ) ( 1 P l is the length of the machine g The permeance of any small section of thickness dr in the slot region is: 2 ldr d P b l dr l s b s 1 ln 2 2 2 / 2 P 2 r g g g r 4 2 eff s s s s g g l g b g b l 2 1 4 1 ln 4 2 P P P here the effective air gap where the effective air gap g k g c eff g b g b k s s s s c 4 1 ln 4 Carter’s coefficient The above derivation assumes that the flux is evenly distributed along the side of the tooth to the depth b s /2. More accurate results through conformal mapping is given in the next page Effective Airgap (2) g k g c eff where the Carter’s coefficient cr cs c k k k 2 1 ln atan 2 b g b b k s s s s cs For stator 2 2 g b g s s s s cs b k 2 approximately s s b g 5 For rotor 2 2 1 ln 2 atan 2 g b b g g b b k r r r r r r cr pproximately r r r r cr b g b k 5 2 approximately Airgap Magnetic Field (1) Since rl r B g g 2 ) ( A. For Round Rotor Machine g r rl r B g g Const 2 ) ( Const g ff r r or r is ’ r’ or r r H g ) (...
View Full Document

This note was uploaded on 11/30/2011 for the course EEL 6208 taught by Professor Staff during the Fall '11 term at University of Central Florida.

Page1 / 13

09 Airgap Magnetic - irgap agnetic Field Airgap Magnetic Field Effective Airgap(1 The permeance P g over the slot pitch of width s is made up of

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online