【 The brushless dc motor in the south of anhui 】 Basic knowledge of brushless dc motor vibration and the cause of brushless dc motor vibration is larger

We know the operation of the brushless dc motor, proper vibration is normal phenomenon, but if the vibration of the BLDC motor is bigger, will accelerate motor bearing wear and greatly reduces the normal service life of the bearing, at the same time, the motor vibration will bring down the winding insulation. End of BLDC motor due to vibration loose tie line, mutual friction caused the end windings, insulation resistance is reduced, shorten the insulation life, serious when insulation breakdown. In addition, the drag mechanical motor vibration can cause damage to the normal operation of the equipment around, made a lot of noise, the hazard. Brushless dc motor in the south of anhui today will take you to understand some basic knowledge about the vibration of the motor: a, have what kind of brushless dc motor vibration value calculating unit? How to understand these units? Common unit of measurement for speed of motor vibration value RMS ( Speed) Vibration amplitude value ( Hereinafter referred to as amplitude, can be single amplitude and double amplitude) And vibration acceleration. The first use morer. ” Speed RMS & throughout; Can be simply interpreted as vibrating material ( Can be seen as a point) In unit time mobile distance, w as the material is actually in place of vibrating back and forth, and didn't move to other places, because of the call & quot; Mobile distance & throughout; Is only one way to describe, so use & other; Effective & throughout; Or & other; Equivalent & throughout; Two words come into & ndash; Step to give explanation. As you can imagine, the value of vibration velocity and vibration amplitude of the vibration ( Away from the center distance) The near and far. Also with the vibration frequency ( The number of units of time back and forth) Relevant and proportional relationship; General unit of mm/s. Vibration is a back and forth in the direction of the two moving particle, swing, leaving a maximum distance of the center is called the amplitude. In a direction away from known as the biggest single amplitude, the distance between the two directions apogee called double amplitude - As with mm or mu m as a unit. The growth of the vibration acceleration is the rate per unit time M, general unit of M/s2. Second, for the speed of RMS and the amplitude of vibration value two values, which & ndash; Kind of better? Are there any conversion relations between them? As mentioned above, the amplitude value only reflect the amplitude of the oscillation. And speed RMS reflect both the big small oscillation amplitude, and reflect the swing speed, the vibration for brushless dc motor itself and the size of the relevant equipment damage degree, and the vibration amplitude and frequency, Swing speed) All about. So, with the vibration velocity to evaluate the size of an electric motor vibration value is more objective. Use a higher value. It is also widely used in the international and China's relevant standards speed RMS as the cause of the vibration measurements. Due to the speed and amplitude of two conditions are not exactly the same, the amount of speed than amplitude of the vibration frequency, and for a run in terms of the brushless dc motor. The frequency of the vibration is not a single, sometimes is very complex, both because of high frequency, the electromagnetic and intermediate frequency and low frequency because of the mechanical so. The conversion relationship without a fixed, but in general, large amplitude of vibration. Vibration velocity will increase accordingly. Three, may cause of the brushless dc motor vibration is larger: 1, the purchase of bearing quality is poorer, can not meet the quality standard, when the assembly is not in accordance with the requirements of process operation, impact deformation, brushless dc motor bearing chamber of tolerance is not reasonable, too tight or too loose, as the simplest method is to use a hammer knock gently along the axis direction, look to whether have improved. 2, due to the high end bearing cover mouth or waveform spring high reason, both ends of the bearing were jammed, the vibration of the brushless dc motor at this time also tend to be higher, often send out & other Buzz throughout the &; The voice. 3, the rotor dynamic balance didn't find out, the precision is not enough. 4, uneven air gap between the stator rotor, the local phenomenon has swept chamber. 5, rotor broken bars, load current size will be according to certain cycle. 6 foot, brushless dc motor, or with different heart load equipment installation.