(1) The high-voltage motor is generally designed to operate at an altitude of no more than 1000m and an ambient air temperature of no more than 40 °C.
(2) When the additional voltage changes within ±5%, the high-voltage motor can run continuously at the rated rate. If the voltage fluctuation is more than ±5%, the load should be limited according to the manufacturer's regulations or test results.
(3) The temperature rise of the medium and high voltage motor in operation shall be in accordance with the regulations of the manufacturer, and this phase data is lacking.
(4) For high-voltage motors with short-term quotas, the temperature rise limit of each part is allowed to be increased by 10K compared with the value specified in Table 1-2.
(5) The allowable temperature of the sliding bearing is 80 °C (when the oil temperature is not higher than 65 °C). The permissible temperature of the rolling bearing is 95°C (the ambient temperature does not exceed 40°C).
(6) If the maximum ambient temperature of the high-voltage motor is between 40 °C and 60 °C, the temperature rise limit specified in the above table shall be subtracted from the value of the ambient temperature exceeding 40 °C.
(7) If the ambient temperature of the high-voltage motor is between 0 °C and 40 °C, the temperature rise limit generally does not increase. When an agreement is reached with the manufacturer, it is allowed to increase (40-t)K, but the maximum is 30K.
(8) In order to avoid dampness, the supply of cooling air must be stopped in time after the shutdown of the motor that is supplied with cooling air from the outside.
(9) Check whether the sparks under the brush are normal, and whether the collector ring (or steering gear) is burned and worn.
(10) Check whether there is abnormal noise and vibration when the motor is running, and whether the stator and rotor are rubbing against each other.