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# Discuss bearing matching degree of the influence of permanent magnet motor malfunction - bearing knowledge

by：Waxing     2020-05-31
Bearing load and motor matching is must consider the problem of motor design steps, bearing reasonable choice, can effectively avoid some unnecessary trouble. Ms。 Friend encountered one thing, when their motor no-load running noise is bigger, the smooth and quiet, but when load in special communication with bearing factory, found that their motor bearing type selection is not reasonable, Suggestions according to the load bearing capacity calculation again. Discuss bearing matching degree of influence on permanent magnet motor malfunction 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) Can be calculated according to the principle of mechanics. 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 function bearing in moment, all is not considered in the calculation of simplified. Discuss bearing matching degree of influence on permanent magnet motor malfunction above apply simplified theory, need only simple tools, such as a small calculator, can be calculated. In fact, basic rated load and equivalent calculation of bearing load standard method, is based on similar assumptions. Using advanced and complex calculation procedures, can need not the above assumptions, the bearing load is calculated according to elastic mechanics theory. In the calculating program, bearings, shaft and bearing are considered as elastic part of the system. Bearing compatibility on permanent magnet motor malfunction aspects including the influence of external force, the weight of the shaft and the bearing parts inherent or the weight of the vehicle and other inertial force, etc. , these are generally 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 ( Such as caused by unbalanced centrifugal force) , usually must rely on the experience of similar machines or smoke bearing configuration can be determined. Discuss bearing matching degree of influence on permanent magnet motor malfunction low gear to gear transmission, the gear in theory of force can be 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 shape error of gear and rotating parts of imbalance can cause additional dynamic force. But general gear at high accuracy standard, to reduce the noise of the runtime, so caused by such force is small, usually when calculating the bearing load can be neglected. Discuss bearing matching degree of the influence application of permanent magnet motor malfunction gear transmission machine, only in the condition of known working conditions, can be determined according to its operation forms and patterns produced by the additional forces. According to different working conditions, gear manufacturers often provides an impact on the 'work' coefficient of load and efficiency of the gear, using this coefficient, which can be used to consider the effect of additional forces of bearing rated life. Discuss bearing matching degree of influence on permanent magnet motor malfunction low belt drive when calculating the bearing load of belt transmission, the main belt is considered effective torque, it depends on the transmission of torque. Belt manufacturers usually depending on the type of the belt don't ask, 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 distance between the axis 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 influence on permanent magnet motor malfunction of bearing static load and dynamic load bearing static load capacity, up to allow the amount of plastic deformation. Plastic deformation of rolling bearings is inevitable. If the limit allowed the plastic deformation of volume is small, the bearing static load capacity is small; If allowed to plastic deformation is bigger, the roll on the pit will be increased bearing noise and vibration in the operation, running accuracy is reduced, affect the normal work of the bearing. Bearing compatibility on permanent magnet motor run, in the influence of the rolling bearing faults on the load bearing 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 capacity is called static load rating, usually expressed in C0. Static load rating is determined in the assumed 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 loading the radial component of the load, is refers to the center of thrust bearing axial load. Bearing the basic rated static load and static load rating is refers to the bearing in a static or rotating, can withstand the biggest load. Bearing compatibility on permanent magnet motor running fault bearing dynamic load rating refers to the influence of the rolling bearing can withstand constant radial load (theoretically Constant axial load) Basic rated under the action of the load, the life expectancy of 1 million RPM, 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.
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