Abstract
A voltage-parameter map (VP-Map) is proposed for predicting the performance of electric vehicles (EVs) and hybrid EVs (HEVs), which varies with respect to the parameters in a variable load and flux-weakening range, and determining the design parameters. Through this, the maximum torque that can be generated at the maximum speed, the input current for generation of the rated torque, and whether the vehicle is operable with a light load are predicted, and the design parameters suitable for the 120-kW class interior permanent-magnet (PM) synchronous motor for HEVs, which is the target electric motor of this study, are determined. A flux-concentrating PM synchronous motor (FCPMSM) is proposed that can be designed using the desired design parameters depending on the degree of the flux concentration. The validity of the VP-Map was verified by analyzing the characteristics of three types of FCPMSMs with different parameter combinations, and a PM synchronous motor for an EV having a high output, high efficiency, and high-power factor was designed. Lastly, the requirements were checked, and the analysis was validated by testing the designed motor.
Highlights
The latest technology trend of traction motors includes the use of higher voltages and higher motor speeds to improve the power density
The design parameters suitable for the target hybrid EVs (HEVs) are determined by analyzing the torque and the power-factor characteristics at the rated speed, the maximum torque that can be generated using the voltage-parameter map (VP-Map) at the maximum speed, the current required for generating the rated torque, and whether the operation is possible under a light load
A study was performed on the design of a flux-concentrating PM synchronous motor for HEVs/electric vehicles (EVs) through a VP-Map-based parameter analysis
Summary
The latest technology trend of traction motors includes the use of higher voltages and higher motor speeds to improve the power density. While an increase in the motor speed allows the motor to be smaller and lighter and have a higher output power density, the high-speed efficiency characteristic is deteriorated, owing to the increase in the core loss. The objective of this study was to develop a method for determining the design parameters for HEVs/EVs under a variable load and to thereby design a traction motor smaller and lighter and having a high-power factor. Characteristic Analysis of Interior pm Synchronous Motor (IPMSM) According to Design Parameters In this paragraph, the output characteristics of the motor were analyzed using the torque equation and the voltage equation for different values of λpm , Ld , and Lq , where λpm is no-load flux linkage, and Ld , Lq are d-axis, q-axis inductance.
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