IEEE Electrification Magazine - June 2014 - 29
The heat balance equations are listed using Kirchhoff's
law to solve the thermal network, and then the average
temperature of the components is calculated using the
method of solving linear thermal circuit. This method can
be used to obtain the average temperature of each component as well as the temperature distribution along the axial
and circumferential directions.
Part 2
Part 1
Applications and
Experimental Verifications
Three different 60-kW IPMs for electrified vehicles are
designed using the design optimization method discussed
in the "Peak Power Optimization" section. These IPMs are
designed with the same main dimensions. The best one
has a peak power-to-weight ratio of 6.3 kW/kg with the
motor specifications listed in Table 2. The IPM A conductors are round wires, whereas the IPM B and IPM C conductors are rectangular wires; thus, IPM B and IPM C can
achieve a higher power density by reducing the current
density. The peak power of these motors is set to be
120 kW at 12,000 r/min.
The operation region near 4,000-11,000 r/min of the three
IPMs are all above 90%, while that of IPM C is higher, above
92%. The high-speed and high-torque regions tend to achieve
higher operation efficiency for IPM C, which is a result of the
loss distribution optimization. Figure 9 shows the installation
of temperature sensors for measuring the IPM C's temperature rise at four different points on the motor end windings
at 80 kW. The continuous lines in Figure 10 are the results
Part 3
Part 4
Figure 6. The IPM's circumferential region's division.
analyzed by the proposed lumped-circuit model, and the
dashed lines are the results measured by the temperature
sensors during tests. It can be noted that the simulated temperatures are a bit higher than the experimental results
because the radiation is not considered in the lumped-circuit
model. The discrepancies near the origin on the experimental temperature curves are caused by the process of increasing the load. However, the simulated results provide a good
global accuracy.
Ambient
P_WaterJacket
P_EndCap
29
4
3
2
1
7
6
8
Pfe_Stator Yoke
9
10
26
Pfe_Teeth
27
Pcu_Layer 1
Pcu_Ew_R
64
50
90
66
51
Airgap
65
Pcu_Ew_L
13
11
12
91
Pcu_Layer 2
62
15
17
23
18
16
24
Figure 7. The lumped-circuit schematic of Part 1.
IEEE Electrific ation Magazine / j une 2 0 1 4
29
Table of Contents for the Digital Edition of IEEE Electrification Magazine - June 2014
IEEE Electrification Magazine - June 2014 - Cover1
IEEE Electrification Magazine - June 2014 - Cover2
IEEE Electrification Magazine - June 2014 - 1
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IEEE Electrification Magazine - June 2014 - Cover3
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https://www.nxtbook.com/nxtbooks/pes/electrification_march2022
https://www.nxtbook.com/nxtbooks/pes/electrification_december2021
https://www.nxtbook.com/nxtbooks/pes/electrification_september2021
https://www.nxtbook.com/nxtbooks/pes/electrification_june2021
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https://www.nxtbook.com/nxtbooks/pes/electrification_september2018
https://www.nxtbook.com/nxtbooks/pes/electrification_june2018
https://www.nxtbook.com/nxtbooks/pes/electrification_december2017
https://www.nxtbook.com/nxtbooks/pes/electrification_september2017
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https://www.nxtbook.com/nxtbooks/pes/electrification_june2017
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