With the small-sized motor power density becomes bigger and bigger, and it carries high electromagnetic loads, causing its thermal load to be higher and higher. So temperature should be considered when small-sized motor is designed. Temperature rise has a bad effect on the motor of the electric automobile, in order to reduce the effect, it lists the reasons causing motor temperature rise and summarize calculation methods, and then make analyses about motor output characteristics influenced by the temperature, what’s more, summarize the monitoring and cooling measures, finally put forward challenges and research direction about the motor of the electric automobile with distributed drive.
