Cogging Torque Reduction and Offset of Dual-Rotor Interior Permanent Magnet Motor in Electric Vehicle Traction Platforms

Hwang, Myeong-Hwan; Lee, Hae-Sol; Yang, Shuying; Lee, Gye-Seong; Han, Jong-Ho; Kim, D.; Kim, Hyeon-Woo; Cha, Hyun-Rok

doi:10.3390/en12091761

Cited by 4 publications

(4 citation statements)

References 17 publications

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“…By comparing the space vector diagrams in normal mode and in switch-open faulttolerant mode as shown in Figure 2, the number of space vectors was decreased from 7 to 4. 2, where ud/uq, id/iq, Ld/Lq, Ψd/Ψq, are the dq-axes voltages, currents, inductances, and stator flux-linkages, respectively, Rs is the stator resistance, ωe is the electric angular velocity, and Ψf is the permanent magnet flux linkage: The voltage and flux equations of IPMSMs are given in (1) and 2, where…”

Section: Conventional Mpdtc Of Ipmsm For Ev In Switch Open-circuit Famentioning

confidence: 99%

“…The drive system of interior permanent magnet synchronous motors (IPMSMs) [1,2] based on two-level voltage source inverters (2L-VSIs) [3,4] has become one of the mainstream speed control schemes for electric vehicles (EVs) due to advantages, such as high efficiency, excellent speed regulation performance, and high power density. In order to improve the security of EVs, the functional safety of the drive system has gradually become one of the research hotspots.…”

Section: Introductionmentioning

confidence: 99%

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Switching Sequence Model Predictive Direct Torque Control of IPMSMs for EVs in Switch Open-Circuit Fault-Tolerant Mode

et al. 2020

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A switching sequence model predictive direct torque control (MPDTC) of IPMSMs for EVs in switch open-circuit fault-tolerant mode is studied in this paper. Instead of selecting one space vector from the possible four space vectors, the proposed MPDTC method selects an optimized switching sequence from two well-designed switching sequences, including three space vectors, according to a new designed cost function of which the control objectives have been transferred to the dq-axes components of the stator flux-linkage under the maximum-torque-per-ampere control. The calculation method of the durations of the adopted space vectors in the optimized switching sequence is studied to realize the stator flux-linkage reference tracking. In addition, the capacitor voltage balance method, by injecting a dc offset to the current of fault phase, is given. Compared with the conventional MPDTC method, the complicated weighting factors designing process is avoided and the electromagnetic torque ripples can be greatly suppressed. The experimental results prove the effectiveness and advantages of the proposed scheme.

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Section: Conventional Mpdtc Of Ipmsm For Ev In Switch Open-circuit Famentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Switching Sequence Model Predictive Direct Torque Control of IPMSMs for EVs in Switch Open-Circuit Fault-Tolerant Mode

et al. 2020

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“…Ashabani M et al [23] developed a semi-analytical model of magnetic pole segmentation to determine the optimal combination of axial widths of magnetic poles by a multi-objective particle swarm algorithm but did not give a method for calculating the optimal angle between neighboring segmented poles. For the weakening of the cogging torque of the dual-rotor permanent magnet motor, in addition to the abovementioned methods, references [24,25] gives some stator designs such as shifted slot openings, variable slot openings, and other stator-side weakening of the cogging torque of the dual-rotor permanent magnet motor.…”

Section: Introductionmentioning

confidence: 99%

Research on Cogging Torque Reduction of Direct-Drive Type Dual-Rotor Radial Flux Permanent Magnet Synchronous Motor for Electric Propulsion Aircraft

Li,

Feng,

Lei

et al. 2024

Energies

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The direct-drive type high-torque-density motor is one of the most promising solutions of electric propulsion for aircraft. The cogging torque of the direct-drive motor causes torque ripple, vibration, and noise, which seriously affect the stability and reliability of the electric propulsion system for aircraft. In this paper, a novel direct-drive type high-torque-density dual-rotor radial flux permanent magnet synchronous motor (DRPMSM) is proposed, and its cogging torque is weakened by permanent magnet shape design and pole-arc coefficient combination. An eccentric and chamfered permanent magnet shape is proposed, and the influence of eccentric distance and chamfer angle on cogging torque is clarified. Through the pole-arc coefficient combination design of the inner and outer rotors of the DRPMSM, the cogging torques of the inner and outer rotor are phase reversed, thus further reducing the total cogging torque of the DRPMSM. By employing the response surface method, a mathematical model is established for the cogging torque of the DRPMSM in relation to the pole-arc coefficients, chamfer angle, and eccentric distance of the permanent magnets. The parameters that minimize the cogging torque of the DRPMSM are obtained using a genetic algorithm. A prototype is manufactured according to the optimized parameters, and experimental results validate the correctness of the theoretical analysis and the effectiveness of the optimization design method.

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“…The overlap and separation of slot openings and rotor cavities are major sources of cogging torque and torque ripple [14]. With the use of hair pin coils, the slot opening can be made arbitrarily small, since the coils are inserted from a stack end.…”

Section: Introductionmentioning

confidence: 99%

Torque Ripple Minimizing of Uniform Slot Machines with Delta Rotor via Subdomain Analysis

2021

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Since the slot opening is large in the uniform slot machine, the torque ripple generated by overlapping or misaligning with the rotor cavity is remarkably large in the case of interior permanent magnet (IPM) machine. In this work, it is observed that the magnitude of torque ripple depends strongly on the phase difference between air-gap field harmonics: The ripple is minimized when the two dominant harmonic components cancel each other. Based on this fact, a condition is developed to minimize torque ripple by adjusting the q-flux channel width and d-flux barrier width. The torque ripple minimizing solution is found from a level chart made by subdomain time-stepping analysis. Finite element analysis (FEA) also gives a very similar minimizing solution. A prototype machine is manufactured, and its performances are validated through experiments.

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Cogging Torque Reduction and Offset of Dual-Rotor Interior Permanent Magnet Motor in Electric Vehicle Traction Platforms

Cited by 4 publications

References 17 publications

Switching Sequence Model Predictive Direct Torque Control of IPMSMs for EVs in Switch Open-Circuit Fault-Tolerant Mode

Switching Sequence Model Predictive Direct Torque Control of IPMSMs for EVs in Switch Open-Circuit Fault-Tolerant Mode

Research on Cogging Torque Reduction of Direct-Drive Type Dual-Rotor Radial Flux Permanent Magnet Synchronous Motor for Electric Propulsion Aircraft

Torque Ripple Minimizing of Uniform Slot Machines with Delta Rotor via Subdomain Analysis

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