Abstract: In order to improve the reliability of the compressor for the room air conditioner, the assembly of the motor for the compressor is analyzed. Through theoretical research, the optimal design method of motor assembly coordination is determined: the minimum interference of motor assembly which meets the requirements of drop test is controlled to meet the requirements of motor force and torque, and the maximum interference of fit is determined according to GB/T 1801 to meet the design requirements of no plastic deformation. The drop test verification of the product using this design method shows that when the actual interference between the motor stator and the cylinder is 13.0 μm, the measured maximum output force is 8680 N, which is consistent with the theoretical calculation results, which proves that it meets the reliability requirements of the product.

Key words: Compressor, Assembly of motor, Optimal design method, Drop test