Commercial reliability analysis of BLDC motor reliability generally adopts the temperature measure device, dc motor reliability is also validated using brushless motor temperature rise. Temperature rise test voltage require the use of drive ac rated voltage of rectification before 1. 15 times or 0. 75 times, by adjusting the Vsp voltage, the motor speed to achieve rated speed 1. 1 times, then take two voltage under high temperature for test results. 1. total temperature determination method law: the motor temperature rise of the ambient air temperature T1 + delta K & le; Insulation class corresponds to the limit temperature T (Formula (1) the T1 peak: outdoor 58 degrees; Indoor machine 40 degrees; delta K limit: seg, E is less than 75 K, B is less than 80 K, F is less than 100 K; Indoor machine, E less than 57 k, B is less than 62 k, F is less than 79 k; the limit temperature T: E 120 degrees, insulation class B insulation 130 degrees, 155 degrees F class insulation. 2, built-in driven dc motor temperature rise test and determine: thermocouple method is used to test and temperature determine whether qualified. total law (Formula (1)Into: the motor temperature rise of the ambient air temperature T1 + delta K = T thermocouple temperature thermocouple & le; Insulation class corresponding to the limiting temperature T the inequality sign on the right: the insulation class corresponding to the limit temperature T can check on the limit temperature of the motor specification type can be simplified as: the motor temperature rise of the ambient air temperature T1 + delta K = T thermocouple temperature thermocouple & le; The stationing temperature limit T specifications (Formula (2) with T1, air temperature of the surrounding environment refers to the motor, through the cloth at 5 mm motor shell surface thermocouple tests. air supply mode, the room air condition room temperature ambient air temperature can be considered a motor. Motor environment air temperature to adjust to the table 1 corresponds to the highest temperature, by adjusting the working condition of room temperature. if the T1 is not adjust to the highest temperature in table 1, need to convert, methods: motor air temperature rise of the highest temperature T1 + delta K = thermocouple convert companies after the temperature T discount (Formula (3) （Formula (3)-（Formula (2), thermocouple convert after temperature conversion = T thermocouple temperature T thermocouple + (The highest temperature T1 - air motor environmentT1）（Formula (4) through test environment air temperature T1, T thermocouple, motor and check the highest temperature T1 in table 1, calculated after the thermocouple convert temperature T discount through checking the motor specification, it is concluded that the stationing temperature limit T specification temperature qualified decision rule: thermocouple convert temperature T after conversion & le; The stationing temperature limit T specifications (Rule 1) 3, the external drive dc motor temperature rise test and determination: using the thermocouple method test, temperature rise and temperature determine whether qualified. total law (Formula (1)Into: T thermocouple temperature thermocouple & le; Insulation class corresponding to the limiting temperature T : the motor temperature rise of the ambient air temperature T1 + delta K = T thermocouple temperature thermocouple introduction: delta temperature K = T thermocouple, thermocouple temperatureMotor air temperature T1 (The formula 5) by testing the stationing thermocouple temperature T, T1, calculated temperature delta K (The calculation method of winding, bearing the same) when the air distribution mode, the room air temperature considered motor air temperature T1; but the cooling or heating mode, the motor air temperature T1 need surface points in the motor test. by look-up table 1 and table 2, judgment of motor winding temperature rise limit delta delta K K the bearing temperature rise limit the ultimate limit calculated by the following methods: delta point K = bearing limit temperature (Check the motor specification)Maximum air temperature T1 - motor (Table 1) temperature qualified rule: delta temperature K & le; Temperature limit delta K limit (Rule 2) 4, commercial air duct indoor motor reliability test note the same wind pipe, due to external static pressure (Duct length)Different, the motor temperature rise is different. Under the same speed, the higher the external static pressure, the lower the motor temperature rise; Don't answer the duct, the motor temperature rise high. Duct when the motor temperature rise test, must be explicitly nominal static pressure of the machine, in principle, requirements on the air flow according to the nominal static pressure test duct of the motor temperature rise. two introduces different duct structure suction duct structure type: into the wind through the evaporator, first through the motor of wind machine structure flow type of duct structure: into the wind through the motor first, and then through the wind pipe structure of evaporator two wind pipe structure, attention should be given to the air temperature of the motor surrounding environment (T1）With the condition of room room air temperature (T room)The relationship between. Thermocouple convert enterprise standard temperature process mentioned motor temperature, air temperature of the surrounding environment refers to the motor, through the cloth at 5 mm motor shell surface thermocouple tests.
