Torqueing similarity/differences between PMSM, FOC BLDC motors and SEDC/PMDC motors
ECE 4/5630 Electric & Hybrid Drive Systems Prof Ka C Cheok
Torqueing similarity/differences between PMSM, FOC BLDC motors and SEDC/PMDC motors (15 pts)
The torque generated by a PMSM by, is the (positive) magnitude of . If we control the angle such that , hence , then the PMSM becomes a Field Oriented Control BLDC motor generating the torque as . On the other hand, the torque generated by a separately excited dc motor can be expressed by (refer to lecture notes). For permanent magnet DC motor, .
BLDC vs SEDC
Describe in detail terms how and are similar. (Which term corresponds to which).
BLDC vs PMDC
Describe in detail terms how and are similar.
PMSM vs PMDC
Explain the difference between and . Explain why we don’t refer PMSM as a BLDC or DC motor.
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2019 Qns Review Homework Assignment B.docx 1 25 June 2019
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I
s
I
s
q
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o
sr
-=±
sin()1
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-=±
ˆ
ˆ
s
BLDCr
N
TBlrI
s
p
=±
A
SEDC
Ki
T
f
=
A
PMDCt
Ki
T
=
ˆ
ˆ
s
BLDCr
N
TBlrI
s
p
=±
A
SEDC
Ki
T
f
=
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s
BLDCr
N
TBlrI
s
p
=±
A
PMDCt
Ki
T
=
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sin()
s
PMSMrsr
N
TBlrI
s
pqq
=-
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sin()
s
PMSMrsr
N
TBlrI
s
pqq
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