关键词: 无刷直流电机, 瞬态高压, 端子结构, 评价模型

Abstract: Transient high-voltage pulse damage to the inner chip of the brushless DC motor for household air conditioning fans caused by external interference has attract considerable attention. Through the analysis of failed products and the simulation of transient disconnection by manually shaking the plug of power line, it had been proven that the market surge voltage had a negative impact on the motor chip. Highten overvoltage ability of the brushless DC motor was crucial to
ensure the long-term normal operation of air conditioning system. A transient pulse suppression circuit was designed on the V_m high-voltage line, and it was compared and verified through the chip surge excitation evaluation model. It was found that the pulse suppression circuit had a good suppression effect on surge voltage. A rigid terminal structure was proposed, and verified the reliability of the terminal connnection through vibration tests with motor running, which reduced the probability of transient surges. The improvement directions were proposed for the surge resistance of brushless DC motor chips for air conditioning fans.

Key words: brushless DC motor, transient high voltage, terminal structure, evaluation model