I. Term explanation: A high speed means that the speed of a DC motor is out of control, and the high current and high torque are used to accelerate the operation. High speed leads to DC motor and mechanical damage. 2. Generate a speeding motor: 1. It mainly occurs on the DC motor. 2. Parallel-operated DC motors are rare. 3 Series-driven DC motor will not be used for speeding. 4. The AC motor will not have a high speed. Iii. Two factors of DC motor generation: 1. Loss of excitation without the reverse potential of the armature, which is necessary. 2. There is no overspeed protection or degaussing protection, which is a sufficient condition. 4. Reasons for speeding:
When the excitation system is running, there is no current, and it will be a high speed. Because the speed of the DC motor is inversely proportional to the magnetic flux, it will slowly stop if the magnetic field is not broken.
The car is so simple. Unlike when starting a motor with no magnetic field will not start, rotating
A huge amount of equipment inertia will become a culprit for speeding vehicles. If there is no excitation, there will be no torque or back potential. The armature current is very large and the parking will not stop. N = u/Ce * diameter --- in this formula, when the magnetic field diameter is 0, the rotation speed n is infinite.
5. Why don't I need a high speed AC motor?
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Of course, the AC motor does not need speed. Because of its different working principles, the highest speed of the AC motor is the synchronous speed.
This phenomenon does not exist in the AC motor. When the stator circuit is powered off, there will be no magnetic field.
The rotor is usually transient or the string has resistance. There is no rotating magnetic field and no external energy. The car will naturally stop.
Motor Speed Problems
