PHASE II
CRADA ORNL99-0568 REPORT
DEVELOPING TRANSMISSION-LESS INVERTER
DRIVE SYSTEMS FOR AXIAL-GAP
PERMANENT MAGNET ACCESSORY AND
TRACTION MOTORS AND GENERATORS
J. W. McKeever
G. J. Su
G. W. Ott, Jr.
Oak Ridge National Laboratory
Kelly Samons
Visual Computing Services Incorporated
LIST OF FIGURES
Figure Page
1 Heat sink........................................................................................................... 5
2 IGBT, board, and capacitor layout ................................................................... 6
3 Copper bus bar attached ................................................................................... 6
4 Assembled inverter ready to test ...................................................................... 7
5 CRADA team during first test of inverter........................................................ 7
A.1 Comparison of hard-switched inverter efficiency with a soft-swtiched
(ART) inverter efficiency at a 10 kVA level.................................................... A-2
A.2 Simplified device model at switching .............................................................. A-3
A.3 Equivalent circuit for an inverter driving two phases of a
brushless dc motor............................................................................................ A-5
A.4 Synchronous three-phase motor with salient poles .......................................... A-6
A.5 Generator equivalent circuit ............................................................................. A-7
A.6 Equivalent circuit for dq axis analysis ............................................................. A-10
B.1 Block diagram of SEMA motor controller using back emf or encoder ........... B-1
C.7.1.1 Plus copper bus bar .......................................................................................... C-30
C.7.1.2 Minus copper bus bar ....................................................................................... C-30
G.1 Block diagram of SEMA motor controller using Hall Probes ......................... G-1
vi
LIST OF TABLES
Table Page
1 Component costs of ORNL inverter/controller................................................ 4
A.1 Torque equations .............................................................................................. A-12
D.1 Testing of STTR at stall conditions ................................................................. D-3
D.2 Testing of STTR at no-load.............................................................................. D-4
D.3 Testing of STTR at rated load .......................................................................... D-4
D.4 Testing of STTR at over-load........................................................................... D-5
Prepared by the
Oak Ridge National Laboratory
Oak Ridge, Tennessee 37831
managed by
UT-Battelle, LLC
for the
U.S. Department of Energy
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