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Agenda
■ Inverter Control Introduction
■ Inverter Technology in Products
■ Motor Control Theory
■ Control Hardware
■ Q & A
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Inverter Control Introduction
■ What is Inverter
Electric wave transformer devices Transform DC current to Specific Frequency AC current.
※ Converter
2
INVERTER
CONVERTER
DC AC
AC DC
- AC Input Current & DC Output Voltage are controllable.
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Inverter Control Introduction
■ Inverter Usage in Industry
Photovoltatic Power
Wind Power
Electric Car or Hybrid Car Charger
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Inverter Technology in Products
BLDC Motor for A/C or Ref. Comp.
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Inverter Technology in Products
FAN Motor for Air-ConditionerMotor for Washing Machine
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Motor Control Theory
Motor Division
Why BLDC?
PMSM Structure
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Motor Control Theory
# Definitions1. BLDC : Brushless DC Motor2. SRM : Switched Reluctance Motor3. SynRm : Synchronous Reluctance Motor4. IPM : Interior Permanent Magnet5. SPM : Surface-mounted Permanent Magnet
Motor
AC Motor DC Motor
Induction
Motor
Synchronous
Motor
Universal
MotorPM Type
Motor
Single Phase
Three Phase PMSM(BLDC, BLAC)
SRM
SynRm
Rotating Linier
Motor Division
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Motor Control Theory
A
BC
A
CB
A
BC
AA
CCBB
Phase A Phase B Phase C
-
+
0 120 240
0 120 240+
+
0
90
180
270
360
-. Rotating Field Theory
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)sin(1 t I I s
Mathematical
)120sin(2 t I I s
)240sin(3
t I I
s
Magneto-motive Force
)sin(2
3
)240sin(
)120sin(
sin),(
3
2
1
m F
F
F
F t F
Motor Control Theory
-. Rotating Field Theory
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Motor Control Theory
-. Torque Generation Theory
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Motor Control Theory
Why BLDC?
Mechanical switching, caused by contact between brush commutator.Short life cycle and regular maintenence is necessary.
Electro-magnetic noise will be generated.
Drawbacks of Brushed DC Motors
General BLDCMotor
Communtator/Brush
Semi-conductorSwitching Devices BLDC Motor- + =
Why BLDC?
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Advantages of BLDC Motor▶ High reliability and long life cycle.
▶ Easy to control(Speed and Torque).
▶ High efficiency(more than 80%).
▶ Easy to down-size.
▶ High speed operation is possible.
Drawbacks of BLDC Motor▶ Complex electric controller is necessary.
▶ Complex position sensing algorithm is necessary.
▶ The usage of permanent magnet increases the cost..
Why BLDC?
※ PMSM is more correct formal name of BLDC
PMSM: Permanent Magnet Synchronous Motor
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Motor Control Theory
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Motor Control Theory
Concentrated
winding)
Distributed
winding)
By Winding Method
PMSMStructure
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Motor Control Theory
Inner Rotor
Outer Rotor
IPM Rotor
Interior
Permanent
Magnet)
SPM
Surface-
mounted
Permanent
Magnet)
By Magnet PositionBy Rotating Object
a+
a-
a+
a-b+
b-
b+
b-
c+
c-
c+
c-
d s
d r
q s
q r
a+
a-
b+
b-
c+c-
a+
a-
b+
b- c+c-
d s
d r
q s
q r
a+
a-
a+
a-b+
b-
b+
b-
c+
c-
c+
c-
d s
d r
q s
q r
a+
a-
a+
a-b+
b-
b+
b-
c+
c-
c+
c-
d s
d r
q s
qr
PMSMStructure
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Motor Control Theory
Inverter Control S/W
Position sensor installed motors as fan motors.
→Measure the position with sensors as Hall IC, Encoder or Resolver.
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Motor Control Theory
Inverter Control S/W
Vdc
EbLbR b
U+ W+
U- V- W-
V+
ia
ib
ic
EaLaR a
EcLcR c
PMSM Motor
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Sensorless motors as compressor.→Measure the position with back-EMF signal.
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Control Hardware
Inverter Platform
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Control Hardware
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Inverter Platform
