brushless dc - lecture 8

brushless dc - lecture 8 - Brushless DC Machines S.D....

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Brushless DC Machines S.D. Sudhoff Spring 2008
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Spring 2008 ECE321 2 Reading • Chapter 7, “Electromechanical Motion Devices,” Sections 7.1-7.8; 7.10
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Spring 2008 ECE321 3 A Brushless DC Machine
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Spring 2008 ECE321 4 Sample Applications • Low Power: h Disk drive motors • Medium Power: h Robot manipulators h Servo systems h Hybrid/electric vehicles • High Power: h Ship and submarine propulsion
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Spring 2008 ECE321 5 Disk Drive Motor
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Spring 2008 ECE321 6 Disk Drive Motor
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Spring 2008 ECE321 7 Disk Drive Motor
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Spring 2008 ECE321 8 4 Hp BDC Machine
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Spring 2008 ECE321 9 Characteristics • The Good • The Bad
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Spring 2008 ECE321 10 Permanent Magnet Synchronous Machines Radial Versus Axial Surface Mounted Versus Buried Magnet Sinusoidal Versus Non-Sinusoidal
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Spring 2008 ECE321 11 Radial Surface Mounted PMSM q-axis d-axis as-axis bs-axis cs-axis rm θ sm φ Path of Integral for Section 7.2.1 rm φ
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Spring 2008 ECE321 12 7.2 Three Phase PMSM
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Spring 2008 ECE321 13 7.10 Three-Phase PMSM • Notation h (7.10-5) • Voltage equations h (7.10-1) h (7.10-3) h (7.10-2) h (7.10-4) ] [ ) ( cs bs as T abcs f f f = f dt d i r v bs bs s bs + = dt d i r v cs cs s cs λ + = dt d i r v as as s as λ + = abcs abcs s abcs p λ + = i r v
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Spring 2008 ECE321 14 7.10 Three-Phase PMSM • Flux Linkage Equations h (7.10-10) • where h (7.10-11) h (7.10-12) m abcs s abcs λ λ + = i L + - = = π θ 3 2 sin( ) 3 2 sin( sin r r r m csm bsm asm m λ λ λ λ λ + - - - + - - - + = ms ls ms ms ms ms ls ms ms ms ms ls s L L L L L L L L L L L L 2 1 2 1 2 1 2 1 2 1 2 1 L
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Spring 2008 ECE321 15 Aside: Explanation of Inductances • We will assume the following • It follows that ) 2 / sin( sm s as P N n φ = /329 - = π 2 2 / sin( sm s bs P N n ) 2 / cos( 2 sm s as P P N w = ) 3 / 2 2 / cos( 2 - = sm s bs P P N w /329 + = 2 2 / sin( sm s cs P N n ) 3 / 2 2 / cos( 2 + = sm s cs P P N w
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Spring 2008 ECE321 16 Aside: Explanation of Inductances • Recall • From which we obtain φ μ λ π β α αβ d g w w rL L i m m = = 2 0 0 , , ) ( ) ( ) ( g P rLN L s asbs 2 2 0 2 πμ - = g P rLN L s asas 2 2 0 4 = Doesn’t include leakage
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Spring 2008 ECE321 17 Aside: Explanation of PM Terms
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Spring 2008 ECE321 18 Aside: Explanation of PM Terms • Suppose the B field due to the PM may be
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This note was uploaded on 09/22/2011 for the course ECE 321 taught by Professor Staff during the Spring '08 term at Purdue.

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brushless dc - lecture 8 - Brushless DC Machines S.D....

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