Sensorless Capability of Fractional–Slot Surface–Mounted...
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Sensorless Capability of Fractional–SlotSurface–Mounted PM Motors
Adriano Faggion Emanuele FornasieroNicola Bianchi Silverio Bolognani
Electric Drives LaboratoryDepartment of Electrical EngineeringUniversity of Padova
IEEE - IEMDC 2011International Electric Machines and Drives Conference
Niagara Falls, 15-18 May 2011
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
This presentation refers to the paper
Adriano Faggion, Emanuele Fornasiero, Nicola Bianchi andSilverio Bolognani
“Sensorless Capability of Fractional–SlotSurface–Mounted PM Motors”
International Electric Machines and Drives Conference(IEMDC 2011)
held in Niagara Falls, CA, May 15-18, 2011
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 2
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Outline
1 Introduction
2 Distributed coil winding
3 Concentrated coil winding
4 Effect of the iron saturation
5 Comparison with other motor topologies
6 Conclusion
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 3
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Introduction
Rotor estimation purpose
Estimating the rotor position
The motor have to exhibit a different value of direct andquadrature inductancesCross–saturation produces an angular error in the rotorposition detectionSPM machine does not allow the identification of therotor position (isotropic rotor)⇒ Insertion of short circuited ring around each pole.This configuration is called ringed–pole SPM motor.
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 4
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Introduction The ringed–pole SPM motor
Scheme and photo of the ringed–pole rotor configuration
Ringed–pole SPM motor
Different electromagnetic behaviour along the d– andq–axis at high frequency thanks to the presence of therotor rings.
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 5
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Introduction The ringed–pole SPM motor
Aim of the work
The ringed–pole solution has been tested with adistributed coil windingThe possibility to use this configuration with aconcentrated coil stator windings is investigated in thispaper
Two kinds of motors are investigated:1 distributed coil windings (number of slots per pole per
phase q = 1.5)2 concentrated coil windings (q = 0.5)
The effect of the conductive ring around each pole isinvestigated in the frequency domain by means of FiniteElements simulations
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 6
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Introduction The ringed–pole SPM motor
FEM analysis
In the following FEM analysis three cases have beenanalyzed:
case 1 only PMs effect is considered, i.e. without thering.
case 2 effect of both the ring and magnetscase 3 only the effect of the ring
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 7
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Introduction The ringed–pole SPM motor
FEM analysis
Main simulation data
Material Conductivity (MS/m)
Permanent Magnet 0.69Iron 0Copper ring 40
To derive the sensorless capabilityA sinusoidal current at different frequency is imposed inthe stator winding (from 10 Hz to 8 kHz)The rotor is placed into two different position withrespect the stator field
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 8
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Introduction The ringed–pole SPM motor
High frequency impedance measurement scheme
Only d–axis current supplied
The magnetic field is along the d–axis and then thed–axis impedance can be computed.
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 9
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Introduction The ringed–pole SPM motor
High frequency impedance measurement scheme
Only q–axis current supplied
The magnetic field is along the q–axis and then theq–axis impedance can be computed
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 10
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Introduction The ringed–pole SPM motor
High frequency saliency
Referring to an equivalent circuit
Because of the short circuited rings, a saliency dependentlyon the frequency can be defined as:
ξ(ωh) =ŻqŻd
=Rr + jωhLrRr + jωhLrt
From FE simulations
ξ(ωh) =λq(ωh)
λd(ωh)
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 11
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Distributed coil winding
Distributed coil winding
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 12
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Distributed coil winding
27–slot 6–pole motor (distributed coil windings)
Such configuration corresponds to the motor prototypeavailable in laboratory.
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 13
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Distributed coil winding
d–axis flux versus frequency (distributed coil windings)
0 2000 4000 6000 80001.5
2
2.5
3
frequency (Hz)d−
axis
flux
link
age
(m
Vs)
case 1case 2case 3
1 The effect of presence of the ring can be notedcomparing case 1 with case 2⇒ d–axis flux linkagedecreases as the frequency increases
2 The presence of PMs (case 2) yields a furtherreduction on the d–axis flux linkage
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 14
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Distributed coil winding
d–axis flux versus frequency (distributed coil windings)
1 The effect of presence of the ring can be notedcomparing case 1 with case 2⇒ d–axis flux linkagedecreases as the frequency increases
2 The presence of PMs (case 2) yields a furtherreduction on the d–axis flux linkage
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 14
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Distributed coil winding
q–axis flux versus frequency (distributed coil windings)
0 2000 4000 6000 80002
2.5
3
3.5
frequency (Hz)q−
axis
flux
link
age
(mV
s)
case 1case 2case 3
1 The effect of presence of the ring is not appreciable⇒the ring has no effect on the q–axis flux linkage.
2 The PMs presence yields a slight effect on the q–axisflux linkage (case 1 and case 2).
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 15
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Distributed coil winding
Saliency versus frequency (distributed coil windings)
101
102
103
104
105
1
1.5
2
frequency (Hz)
salie
ncy
ratio
(−
)
case 1case 2case 3
1 At low frequencies there is a small saliency of about1.07 due to a slight rotor anisotropy.
2 At 1 kHz the saliency increases from 1.1 (case 1) to 1.3(case 3) thanks to the rings.
3 Considering the PMs the saliency increases to 1.4.4 Without rings, almost no saliency variation at 1 kHz.
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 16
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Distributed coil winding
Inductance versus rotor electrical angle at 1 kHz (distributed coil windings)
0 50 100 1504.5
5
5.5
6
6.5
Electrical position, θme
(rad)
Indu
ctan
ce, L
(m
H)
case 1case 2case 3measurement
1 The anisotropy is significant only if a ring is presentaround the pole (case 2 and 3).
2 The effect of the PMs conductivity is beneficial toimprove the saliency (case 3 against case 2).
3 Experimental tests (squared marker) confirm theaccuracy of the motor model.
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 17
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Concentrated coil winding
Concentrated coil winding
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 18
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Concentrated coil winding
9–slot 6–pole motor (concentrated coil winding)
Motor sketch
Slot–opening
Effect of the slot openingIEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 19
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Concentrated coil winding
Flux linkage versus frequency (concentrated coil winding)
d–axis – narrow slot opening
0 2000 4000 6000 80004
5
6
frequency (Hz)d−
axis
flux
link
age
(m
Vs)
case 1case 2case 3
d–axis – wide slot opening
0 2000 4000 6000 80002
3
4
frequency (Hz)d−
axis
flux
link
age
(m
Vs)
case 1case 2case 3
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 20
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Concentrated coil winding
Flux linkage versus frequency (concentrated coil winding)
q–axis – narrow slot opening
0 2000 4000 6000 8000
5.6
5.8
frequency (Hz)q−
axis
flux
link
age
(mV
s)
case 1case 2case 3
q–axis – wide slot opening
0 2000 4000 6000 80003
3.5
4
frequency (Hz)q−
axis
flux
link
age
(mV
s)
case 1case 2case 3
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 21
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Concentrated coil winding
Saliency versus frequency (concentrated coil winding)
Narrow slot opening
101
102
103
104
105
1
1.05
1.1
1.15
1.2
1.25
1.3
1.35
frequency (Hz)
salie
ncy
ratio
(−
)
case 1case 2case 3
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 22
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Concentrated coil winding
Saliency versus frequency (concentrated coil winding)
Wide slot opening
101
102
103
104
105
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
frequency (Hz)
salie
ncy
ratio
(−
)
case 1case 2case 3
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 23
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Concentrated coil winding
Inductance versus rotor angle (concentrated coil winding)
Inductance – narrow slot opening
0 50 100 1509.5
10
10.5
11
11.5
12
Electrical position, θme
(rad)
Indu
ctan
ce, L
(m
H)
case 1case 2case 3
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 24
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Concentrated coil winding
Inductance versus rotor angle (concentrated coil winding)
Inductance – wide slot opening
0 50 100 1505.5
6
6.5
7
7.5
Electrical position, θme
(rad)
Indu
ctan
ce, L
(m
H)
case 1case 2case 3
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 25
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Concentrated coil winding
Wide versus narrow slot opening
The results obtained with both the configurations arecomparable with those of the 27–6 motor configuration.With the narrow slot opening the flux linkages and theinductance values increase respect to the wide slotopening case.The saliency with the wide slot opening is greater thanthat with the narrow slot openingIn both the cases the sensorless capability withinjection of high frequency signals remains still working.
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 26
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Effect of the iron saturation
Effect of the iron saturation
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 27
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Effect of the iron saturation
Effect of the iron saturation
In order to consider the effect of the iron saturation onthe motor model, the mutual inductance LM betweenthe ring and the d–axis windings has been computedfor different motor working point.
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 28
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Effect of the iron saturation
Map of LM (µH) with distributed coil winding
−10 −5 0 5 100
1
2
3
4
5
6
7
8
9
10
Id (A)
Iq (
A)
37.537.5
3838
38
38.538.5
38.5
3939
39
39.539.5
39.5
4040
40
40.540.5
40.5
4141
41
41.541.5
41.5
4242
42
42.542.5
42.5
MTPA trajectory
LM depends mainly on the Id currentLM is practically constant along the MTPA trajectoryIn all the plane the saliency variation is quite low
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 29
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Effect of the iron saturation
Map of LM (µH) with concentrated coil winding
−6 −4 −2 0 2 4 60
1
2
3
4
5
6
7
Id (A)
Iq (
A)
3333
33
3434
3435
3535
3636
36
37
3737
3838
38
3939
39
40
4040
4141
41
42
42
42
MTPA trajectory
The mutual inductance is slightly smaller than thedistributed coil winding caseSaturation does not affect mutual inductance
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 30
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Comparison with other motor topologies
IPM and inset rotor configuration
IPM motor INSET motor
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 31
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Comparison with other motor topologies
Sensorless capability
Both the motors present a magnetic saliency, more preciselythe small signal magnetic saliency can be computed as:
ξωh =1 + b/f1− b/f
where b/f is the ratio between the amplitude of thebackward and forward sequence of the current signal, givenby
bf=
√(Ld − Lq)2 + M2dq
Ld + Lq
where Ld and Lq are the d– and q–axis differentiallyinductances and Mdq is the dq mutual inductance due to thecross–saturation.
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 32
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Comparison with other motor topologies
Estimation error due the cross–saturation
Effect of cross–saturationThe estimated position error due to the cross–saturation is
� =12
arctan2Mdq
Ld − Lq
⇒ a compensation algorithm is necessary to correct theposition estimation error
The critical point is when Mdq = 0 and Ld = Lqsimultaneously
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 33
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Comparison with other motor topologies
Magnetic saliency ξωh in the d − q plane, IPM motor
−15 −10 −5 0 5 10 150
2
4
6
8
10
12
14
16
Id (A)
Iq (
A)
1.1
1.2
1.3
1.3
1.4
1.4
1.4
1.5
1.5
1.5
1.5
1.5
2
2
2
22
2
2
3
3
3
3
3
3
3
4
4
4
4
4
5
5
5
5
6 6
6
SaliencyMTPA trajectory
The magnetic saliency remains high in all the left–plane⇒ good for control purposes
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 34
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Comparison with other motor topologies
Magnetic saliency ξωh in the d − q plane, INSET motor
−15 −10 −5 0 5 10 150
2
4
6
8
10
12
14
16
Id (A)
Iq (
A)
1.3
1.3
1.4
1.4
1.4
1.4
1.4
1.4
1.5
1.5
1.5
2
2
2
3
3
SaliencyMTPA trajectory
Magnetic saliency is smaller than the IPM case, butalways > 1
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 35
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Comparison with other motor topologies
Estimated error in the d − q plane, IPM motor
When Ld = Lq and Mdq = 0⇒ ξωh = 1⇒ thesensorless detection of the rotor position is not possible
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 36
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Comparison with other motor topologies
Estimated error in the d − q plane, INSET motor
−15 −10 −5 0 5 10 150
2
4
6
8
10
12
14
16
Id (A)
Iq (
A)
−30
−20
−20
−20
−20
−15
−15
−15
−15
−10
−10
−10
−10−5
−5
−5
−5
5
5
5
5
5
5
10
Mdq
=0
MTPA trajectory
Estimated error along the MTPA trajectory lower thanthe IPM⇒ the curve Mdq = 0 close to MTPAThe limit Ld = Lq is not present since it is out of the plotlimits
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 37
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Comparison with other motor topologies
Estimated error in the Ringed motor
The high–frequency saliency is guaranteed from thering effect in all the d − q plane (LM almost constant)
−10 −5 0 5 100
1
2
3
4
5
6
7
8
9
10
Id (A)
Iq (
A)
37.537.5
3838
38
38.538.5
38.5
3939
39
39.539.5
39.5
4040
40
40.540.5
40.5
4141
41
41.541.5
41.5
4242
42
42.542.5
42.5
MTPA trajectory
−6 −4 −2 0 2 4 60
1
2
3
4
5
6
7
Id (A)
Iq (
A)
3333
33
3434
3435
3535
3636
36
37
3737
3838
38
3939
39
40
4040
4141
41
42
42
42
MTPA trajectory
No estimated error occurs since the cross–saturationeffect is negligibleControl algorithm needs no error compensation
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 38
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Conclusion
Conclusions
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 39
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Conclusion
Conclusion
Two SPM ringed pole motors with distributed andconcentrated coil winding have been considered fromthe control point of viewIt is shown that ring around each pole represent aneffective method to create a high frequency saliency,also when a fractional–slot winding is adoptedIt is shown that the effect of the eddy currents in thePMs give a useful contribution on increasing thesaliency, but they are not enough to create the saliencywithout the ring
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 40
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Conclusion
Conclusion
An IPM and a INSET motor have been compared withthe SPM motorsBoth the IPM and the INSET motor are suitable for thesensorless purpose, but an error compensationalgorithm is necessaryThe Ringed–pole solution yields a negligible mutualcoupling and then a negligible estimation error, too.
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 40
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Conclusion
Related Papers by the Authors
S. Bolognani, S. Calligaro, R. Petrella, and M. Tursini,“Sensorless control of ipm motors in the low-speedrange and at stand-still by hf-injection and dftprocessing,” in IEEE International Electric Machines andDrives Conference, 2009. IEMDC ’09., May 2009, pp.1557 –1564.
N. Bianchi, S. Bolognani, J.-H. Jang, and S.-K. Sul,“Advantages of inset pm machines for zero-speedsensorless position detection,” IEEE Trans. on IndustryApplications, vol. 44, no. 4, pp. 1190 –1198, 2008.
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 41
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Conclusion
Related Papers by the Authors (cont.)
N. Bianchi, S. Bolognani, and A. Faggion,“Predicted and measured errors in estimating rotorposition by signal injection for salient-pole pmsynchronous motors,” in IEEE International ElectricMachines and Drives Conference, 2009. IEMDC ’09.,May 2009, pp. 1565 –1572.
A. Faggion, S. Bolognani, and N. Bianchi,“Ringed-pole permanent magnet synchronous motor forposition sensorless drives,” in IEEE Energy ConversionCongress and Exposition, 2009. ECCE 2009., 2009, pp.3837 –3844.
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 42
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Conclusion
Related Papers by the Authors (cont.)
A. Faggion, N. Bianchi, and S. Bolognani,“A ringed–pole spm motor for sensorless drives –electromagnetic analysis, prototyping and tests,” inIEEE International Symposium on Industrial Electronics,ISIE 2010, Bari, IT, Jul. 4–7, 2010.
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 43
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Introduction
Distributedcoil winding
Concentratedcoil winding
Effect of theiron saturation
Comparisonwith othermotortopologies
Conclusion
Conclusion
Thank you for the attention.
IEMDC 2011 Sensorless Capability of Fractional–Slot Surface–Mounted PM Motors 44
IntroductionThe ringed–pole SPM motor
Distributed coil windingConcentrated coil windingEffect of the iron saturationComparison with other motor topologiesConclusion