Abstract : This paper introduces the temperature rise test of an increased safety linear motor under rated operation and stall conditions, as well as the methods, procedures, and requirements for determining the tE time, through a test example. Keywords : tE time; increased safety type; linear motor 1. Introduction The tE time of an increased safety linear motor is an important parameter for evaluating its explosion-proof performance. GB3836.3 "Explosion-proof Electrical Apparatus for Explosive Atmospheres - Increased Safety Type 'e'" clearly stipulates that the tE time of increased safety motors must be measured. The tE time is defined as the time taken for the AC windings to reach the final stable operating temperature after reaching the rated operating temperature at the highest ambient temperature, from the moment the starting current begins to flow until the temperature rises to the limit temperature. For linear motors, the tE time is measured under normal operating conditions, after the motor has reached a stable temperature rise, and then when the motor is suddenly stalled, the time required for the primary and secondary temperatures to reach the limit temperature. Therefore, the tE time is an important aspect of temperature rise measurement for explosion-proof motors. The temperature rise measurement of linear motors is related to their operating mode. Currently, linear motors used in China operate under short-time and intermittent operating modes. my country specifies four standard operating times for intermittent operation: 15, 30, 60, and 90 minutes. For motors operating intermittently, the ratio of rated load operating time to the entire cycle is called the duty cycle (load factor). Internationally, this is called the duty factor (DF). my country specifies standard DF values ​​of 15%, 25%, 40%, and 60% for intermittent operation. The total cycle time is 10 minutes. Since the national standards for various technical indicators of linear motors have not yet been established, the temperature rise measurement of linear motors is conducted according to the test methods and basic technical requirements for small and medium-sized asynchronous motors in the national standards. According to Appendix B of GB3836.3, "Type Test Guidelines for Increased Safety Squirrel Cage Rotor Motors," the steps for measuring the tE time are as follows: [b][align=center]For details, please click: Measurement of tE Time of Linear Motors[/align][/b]