Two ways to solve the noise problem through the control side:
The first method is to use a dual controller to reduce high frequency electromagnetic noise. As shown in the figure below, the PWM harmonics of the motor current can be significantly suppressed by the dual controller. Reach the noise reduction effect.
Another point of view is relatively new. A predecessor found that the main vibration mode of the motor is 4th order, and the electromagnetic force that causes the vibration of this order is greatly affected by the direct current. He simulated and experimented and found that not only the motor state and the power generation state vibration are inconsistent, even in the second phase limit of the electric state (Id is negative, Iq is positive), different Id and Iq are allocated, and the vibration magnitude is different. Therefore, he put forward the idea that when the motor and controller are coupled, the objective should be to optimize the electromagnetic force and optimize the motor parameters and control strategy to achieve the best noise distribution. However, no actual product application has been seen yet.
Why do you want to be a master?
In dealing with motor vibration and noise, we naturally divide into two genres. Engineers like to solve problems from the experience of noise and vibration, and the school likes to analyze problems from theoretical models. Both methods have their own advantages and disadvantages. The shortcomings of the engineering school are obvious:
First, the engineering method is too dependent on experience. This kind of experience can only be obtained through self-experience or the words and deeds of the old drivers, which is not conducive to inheritance.
Second: Many problems are homologous, or heterologous, the same disease, the same cause, or the same cause but different, completely difficult to distinguish by experience.
The theoretical model analysis method of the academics also has many shortcomings:
First, the theoretical analysis often starts from the steady state ideal state, such as constant speed, constant torque, etc., but in reality, many vibration noises occur in transient processes such as acceleration and speed regulation, and the analysis results are difficult to apply directly.
Second, there are many theoretical vibration sources for the motor. There are many possibilities for abnormal vibration noise, which may be caused by the eccentricity of the rotor, or it may be improper matching of the slot. It takes time and effort to analyze a process, and it is difficult to traverse all possibilities.
The problem is forced to think, and the difficulty promotes growth. In the face of real needs, many of the predecessors were stunned, and cultivation became a martial art that combines the strengths of the two, and became a master of comprehensive use. Next, introduce a trick and routine for solving the problem.
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