服务热线
13313705507
参与过电机试验，或者是电机的实际使用者，可能都遇到过一种情况，就是电机在启动或断电过程中，可能会发生抖动，这个问题也有粉丝提出过，今天我们针对该现象与大家进行简单交流。
电机试验过程中，如果采用调压或调频方式起动，电机的起运过程相对平衡，相反，当电机按照正常运行电压起动时，电机会有比较明显的抖动现象；同样，正常运行的电机，突然断电了，也有类似现象发生，有时候还会伴有比较明显的噪声。
机械共振作用
当电机运行中的机械系统所受激励的频率，与该系统的某个阶段的固有频率相接近时，将会发生明显的共振现象，出现明显的位移共振，有时会因为振动作用而产生比较明显的声音。电机启动或断电运行过程中，所发生的“抖动”就是一种共振的具体表现。
该类问题在变频电机的使用过程中也时有发生，变频电机可能在某些频段的运行效果特别好，而在其他频段可能存在明显的电磁噪声，其根本的原因是由于电磁共振的作用。
惯性状态改变的具体表现
电机启动过程及停止过程都是一种惯性改变的过程，改变惯性的过程，即运行对象受力改变的过程，改变的时间越短、受力越大，状态改变即越明显，直接的物理表象为人的直觉可以感受到的振动，对于电机产品而言，可能是声音和位移的变化。
为此，电机安装使用过程中的固定非常必要，例如通过电机底脚面、端盖法兰面与安装基准进行固定，必要时增加其他限位措施。在电机运行过程中，会因为难以规避的振动问题发生固定的松动问题，因而定期的保养和维护特别必要。
Those who have participated in motor tests or are actual users of motors may have encountered a situation where the motor may shake during startup or power outage. This issue has also been raised by fans. Today, we will have a brief discussion with everyone about this phenomenon.
During the motor testing process, if voltage or frequency regulation is used to start the motor, the starting process of the motor is relatively balanced. On the contrary, when the motor is started at the normal operating voltage, there will be a noticeable vibration phenomenon in the motor; Similarly, when a normally running motor suddenly loses power, similar phenomena occur, sometimes accompanied by noticeable noise.
Mechanical resonance effect
When the excitation frequency of the mechanical system in operation of the motor is close to the natural frequency of a certain stage of the system, obvious resonance phenomenon will occur, with obvious displacement resonance, and sometimes more obvious sound will be produced due to vibration. The vibration that occurs during the starting or power-off operation of the motor is a specific manifestation of resonance.
This type of problem also occurs during the use of variable frequency motors. Variable frequency motors may have particularly good operating effects in certain frequency bands, while there may be obvious electromagnetic noise in other frequency bands, and the fundamental reason is due to the effect of electromagnetic resonance.
The specific manifestation of inertia state change
The process of starting and stopping a motor is a process of inertia change, which refers to the process of changing the force on the operating object. The shorter the time of change and the greater the force, the more obvious the state change. The direct physical appearance is the vibration that can be felt by human intuition. For motor products, it may be the change in sound and displacement.
Therefore, it is necessary to fix the motor during installation and use, such as by fixing the motor foot surface, end cover flange surface with the installation reference, and adding other limiting measures if necessary. During the operation of the motor, fixed looseness may occur due to unavoidable vibration issues, so regular maintenance and upkeep are particularly necessary.
