Regarding the wiring of the motor
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The fan I bought today has arrived; it’s equipped with a 15KW, 6-pole variable-frequency motor. When testing it by powering it on, it was found that the motor was connected in a star configuration. The experienced electrician at the factory said that there might be a problem with the motor, as according to his experience, motors with a power rating of over 4KW are always connected in a delta configuration. I tested it by powering it up in a star connection; at 50HZ, the full-load current was 32A, which is basically normal. However, the heating was quite severe, with a relatively high temperature rise – estimated to be over 60 degrees. I called the motor manufacturer for consultation, and they said it was normal and could be used. I’d like to ask experts: Is this situation normal?
What is the insulation class? If Class F is acceptable, then Class F insulation is generally used; the temperature rise is evaluated based on Class B standards