1. Hand touch method: a method of estimating the temperature of the motor according to the strength of the hand touch by touching the specified part of the motor by hand. See the table.
Relationship between surface temperature and feel of motor casing
Case surface temperature °C | Feel | Description |
30 | Slightly cold | Lower than body temperature, feeling a little cold |
40 | Slightly warm | Feel the degree of warmth |
45 | mild | Feel warm when touched by hand |
50 | Slightly hot | Touching the hand for a long time, the palm turns red |
55 | heat | Only use hand to touch 5~6s |
60 | Hotter | Only use hand to touch 3~4s |
65 | very hot | Only touch the hand for 2~3s. After the hand leaves, the palm still feels hot. |
70 | very hot | Only one 3s can be touched with one finger |
75 | Extremely hot | Touch with a finger, can endure 1 ~ 2s |
80 | Extremely hot, suspect that the motor has burned out | I can't touch it with a finger, vinyl crimping |
85～90 | Extremely hot, suspect that the motor has burned out | If you touch it with your finger, it’s like burning it. |
2. Thermometer method: The temperature rise of the motor is directly measured by a thermometer.
When the motor reaches the rated operating state, its temperature gradually rises to a certain stable value and no longer rises. At this time, the temperature of the motor can be measured by a thermometer (preferably an alcohol thermometer). The method is: the sphere of the alcohol thermometer is wrapped with tin foil and inserted into the hole of the motor ring, so that the sphere of the thermometer is closely attached to the circumference of the hole, and then the hole is sealed with cotton. At this time, the temperature measured by the thermometer is about 10 °C lower than the hot spot of the motor winding. Therefore, adding 10 °C to the measured temperature and then subtracting the ambient temperature (+40 °C) is the actual temperature rise of the motor.24V Dc Controller,48V Dc Controller,Dual Channel Controller,Dual Channel Dc Controller
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