Considering the relationship between voltage and frequency is the logical reasoning of normal thinking - Database & Sql Blog Articles

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When I used to do synchronous servo, I didn't think about the problem of excitation current...
1. The problem of "excitation current Id" is the problem of voltage U;
2. The curve of "excitation current Id" and frequency is the curve of voltage and frequency;
3. "Excitation current Id" is coupled in the motor current, one cannot be detected, and the second cannot be directly controlled. Considering that the excitation current Id is useless;
4. The voltage U is measurable and controllable. It is logical to think about the relationship between voltage and frequency.
5, frequency control, frequency, voltage curve can be measured under no-load current, or rated load current:
1) Under the rated frequency, keep the no-load current (or rated load current) unchanged, and determine the frequency and voltage curve;
2) Above the rated frequency, keep the rated voltage U unchanged and increase the frequency, this curve is determined;
6. In the case of weak magnetic speed regulation, since the voltage is constant, the frequency rises, and the excitation current is almost "inversely proportional" reduced. Considering the excitation current Id will complicate the problem!
7. When weak magnetic speed regulation, the key is whether the load nature of the motor drag is allowed. Only the load is a constant power load can enter the weak magnetic speed regulation process, otherwise it is not allowed!