关键词: 汽车空调鼓风机；外转子；无刷直流电机；功率分布

Abstract: In this paper, according to the power supply voltage, the speed span, and the operation condition of the air conditioner blowers of vehicles, the performance advantages of the brushless direct current (DC) motor with fractional-slot concentrated winding outer-rotor applied in this area are analyzed. As for a fractional-slot concentrated winding outer-rotor brushless DC motor with a power supply voltage of 13.5 V and outer diameter of Φ88 mm, the parameters including main dimension, length-to-radius ratio, pole-slot combination, air-gap length, etc. are electromagnetics designed. The 2D finite element model of the motor is established and simplified, which the finite element simulation is carried out to determine the electromagnetic performances of the motor. The simulation results show that the design scheme of the motor can satisfy the demanded performances. Based on the former electromagnetics design, the achievable power range for the motor is obtained by modifying the wire turns, wire diameter, and axial length of the stator core of the motor, with the platform-based design method adopted and the other parameters unchanged. The recommended power distribution of the motor is given by considering the current, current density, loss, winding difficulty and cost of the driver. For the external rotor brushless DC motor of the air conditioner blower with the same power supply voltage and outer diameter, the design can be selected, and the parameters can be adjusted or the performance can be optimized according to the above power range.

Key words: air conditioner blowers of vehicles; outer rotor; brushless DC motor; power range