Discuss bearing matching degree of influence on permanent magnet motor running problem

Bearing load and motor matching is necessary to think to the problem of motor design steps, bearing reasonable choice, can effectively prevent some don't want to bother. Ms。 Friend encountered one thing, when their motor no-load running noise is bigger, but very smooth and quiet when load is running, and bearing manufacturer communication, found that their motor bearing type selection is not reasonable, initiative can be recalculated according to the bearing load. Discuss bearing matching degree of influence on permanent magnet motor running problem of how to calculate the bearing dynamic load effect on the bearing load, under the external force of known or calculable ( Such as driving force, work force, inertia force) Based on the principle of mechanics to calculate. When calculating a single bearing load of the component, in order to simplify the calculation, the shaft is considered by the rigid and no moment is fulcrum bearing beam. Bearings, bearing or the elastic deformation of mechanical structure, shaft deflection incurred on the role of bearing torque, all not to think in the simplified calculation. Discuss bearing matching degree of influence on permanent magnet motor operation problems above apply simplified theory, only need simple tools, such as a small calculator, can stop counting. In practice, the calculated at rated load and equivalent measures for the specification of the bearing load is presented based on the assumption. Application of advanced and complex calculation procedures, can need not the above assumption, and on the basis of elastic mechanics theory to calculate the load bearing. In the calculating program, bearing, shaft and bearing seat are thinking for elastic local in the system. Discuss matching degree of the permanent magnet motor bearing fault operation aspects including the influence of the external force, the weight of the shaft and the bearing parts inherent or the weight of the vehicle and other inertial force, the ordinary are known number, or can be calculated. But other external forces, such as the work force, Ground stress and machine tool cutting force, etc. ) , the impact force and additional dynamic force ( If due to uneven provoked centripetal force) , typically based on a similar machine or smoke bearing configuration experience ability for sure. Discuss bearing matching degree of influence on permanent magnet motor running problem of low gear on gear transmission, the gear in theory of force to calculated according to the transmission power and the types of gears. But there are also other dynamic force due to the gear, transmission end or output end. In addition, the gear shape error and rotating parts of imbalance will also form the additional dynamic force. But ordinary gear at high accuracy specifications, to reduce the noise when running, so the force produced by the reason usually is very small, when calculating the bearing load can be neglect. Discuss the influence of matching degree of the permanent magnet motor bearing fault operation application of gear transmission machine, as long as the work condition under the condition of known, talent must according to its operation mode and the form of additional forces. According to different working conditions, gear manufacturers often provides an impact on the 'work' coefficient of load and efficiency of the gear, apply this coefficient, can be used to consider additional forces affect bearing rated life. Discuss bearing matching degree of influence on permanent magnet motor running problem of low belt drive when calculating the bearing load of belt transmission, thinking is the most main effective belt torsion, it depends on the torque transmission. Belt manufacturers general is on the basis of don't ask, don't belt type, preloaded, belt tensioning force and additional dynamic force, to provide a system used to calculate the belt tension. If cannot get related coefficient, can use the following reference: toothed belt - — 1. 1 ~ 1. 3; Triangle ( V belt) — — 1. 2 ~ 2. 5; Flat belt - — 1. Five to four. 5; When the interval between the shaft is very short, in the heavy load, or under the action of impact load is large, or tension, should use a larger value. Discuss bearing matching degree of the influence of permanent magnet motor operation fault of bearing static load and dynamic load bearing static load ability, by resolution allows the amount of plastic deformation. To prevent the rolling bearing in the plastic deformation is a must. If the limit allowed the plastic deformation of volume is small, the bearing static load can also is very small; If allowed large plastic deformation, rolling on the pit will be increased bearing noise and vibration in the operation, running accuracy is reduced, affect the normal work of the bearing. Discuss the influence of matching degree of the permanent magnet motor bearing fault operation in the rolling bearing, in an interview with load of the largest rolling element and raceway contact points, the total amount of plastic deformation is less than one over ten thousand of the diameter of the roller, has no much impact on the normal operation of bearing. Put in this kind of plastic deformation under the condition of certain bearing static load can be referred to as a static load rating, common use C0 said. Static load rating is the assumption that resolution load conditions, the centripetal bearing, static load refers to the radial load rating of centripetal thrust bearing ( Angular contact ball bearing) Is letting half a circle in the bearing raceway radial loading of the load weight, is refers to the center of thrust bearing axial load. The fundamental h rated static load and the ultimate bearing static load refers to the bearing in a static or rotating, maximum acceptable load. Bearing compatibility on permanent magnet motor running fault bearing dynamic load rating refers to the influence of the rolling bearing theory can accept constant radial load ( Constant axial load) , under the action of the load rating for the life of a 1 million turn, bearing the basic dynamic load rating of bearing rolling fatigue resistance ability. Centripetal bearing and thrust bearing don't referred to as the basic dynamic load rating of the basic dynamic load rating and axial radial basic dynamic load rating, expressed in Cr and Ca.