bdc drives
TRANSCRIPT
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EE595S: Class Lecture Notes
Chapter 15: Brushless DC Motor Drives
S.D. Sudhoff
Fall 2005
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Fall 2005 EE595S Electric Drive Systems 2
15.1 Architecture
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Fall 2005 EE595S Electric Drive Systems 3
15.2 Topology
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Fall 2005 EE595S Electric Drive Systems 4
15.3 Equivalence of VSI Schemes
to Idealized Source
180 VSI
Duty Cycle Modulation
Sine-Triangle Modulation
Sine-Triangle Modulation (with 3rd) Space-Vector Modulation
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Fall 2005 EE595S Electric Drive Systems 5
180 VSI Operation
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Fall 2005 EE595S Electric Drive Systems 6
180 VSI Operation
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Fall 2005 EE595S Electric Drive Systems 7
180 VSI Operation
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Fall 2005 EE595S Electric Drive Systems 8
180 VSI Operation
Comparing the two figures
(15.3-1)
Now recall
(15.3-2)
(15.3-3)
hrc +=
dc
c
qsvv
2=
0=cds
v
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Fall 2005 EE595S Electric Drive Systems 9
180 VSI Operation
Using the frame-to-frame transformation
(15.3-4)
(15.3-5)
Thus
(15.3-6)
(15.3-7)
hdcrqs vv cos2=
hdcrds
vv
sin2=
dcs vv
2
2
1=
hv =
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Fall 2005 EE595S Electric Drive Systems 10
180 VSI Operation
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Fall 2005 EE595S Electric Drive Systems 11
Duty Cycle Modulation
In this case
(15.3-8) (15.3-9)
Thus
(15.3-10)
(15.3-11)
So
(15.3-12)
(15.3-7)
dccqs vdv 2=0=c
dsv
hdcrqs vdv cos2=
hdcrds
vdv
sin2=
dcs vdv2
21=
hv =
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Fall 2005 EE595S Electric Drive Systems 12
Duty Cycle Modulation
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Fall 2005 EE595S Electric Drive Systems 13
Sine-Triangle Modulation
In this case, converter angle calculated as
(15.3-13)
Now recall
(15.3-14)
(15.3-15)
(15.3-16)
vrc +=
>
+=d
dddf
d
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Fall 2005 EE595S Electric Drive Systems 14
Sine-Triangle Modulation
Converting to the rotor reference frame
(15.3-17)
(15.3-18)
>
=1cos)(
1cos
221
ddfv
ddvv
vdc
vdcrqs
>
= 1sin)(
1sin
2 2
1
ddfv
ddv
vvdc
vdcrds
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Fall 2005 EE595S Electric Drive Systems 15
Sine-Triangle Modulation
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Fall 2005 EE595S Electric Drive Systems 16
Sine Triangle Modulation
with 3rdHarmonic Injection
Following our earlier work, we will have
(15.3-19)
(15.3-20)
3/20cos21 = dvdv vdcrqs
3/20sin21 = dvdv vdc
rds
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Fall 2005 EE595S Electric Drive Systems 17
Space Vector Modulation
In this case we have
(15.3-21)
(15.3-22)
(15.3-23)