Selection basis of special bearings for motors

Applying the normal bearing selection method does not necessarily lead to a reasonable bearing type for all motors, and the industry has extremely strict requirements. After years of research, ZWZ has developed a selection method suitable for high-precision, high-speed, low-vibration motor bearings, and applied this concept to develop suitable motor bearings. The motor bearing selection process recommended by ZWZ is as follows: determine the bearing type by the spindle size, determine the bearing size, determine the bearing parameters and determine the bearing installation method. Determine the bearing dimensions, then determine the bearing accuracy according to the speed, select the matching form according to the load condition, select the internal clearance according to the rotational speed and heating conditions, then determine the bearing clearance according to the fit and internal clearance, and select the bearing vibration according to the noise requirements and type. grade. The bearing load used in the motor industry is not a big problem, depending on whether the grease or oil lubrication is selected according to the mechanical space. According to the rotor weight and magnetic tension, after precise calculation, the key parameters of the bearing are finally determined to meet the needs of use. The general order is as follows: first determine the operating conditions of the motor and bearing, the requirements for the bearing, and then follow the steps below to select the structure type, select the external dimensions, determine the product accuracy, select the clearance, determine the bearing coordination, select the vibration level, select the material, and select the bearing's operating conditions and environmental conditions : Correctly grasping the use position of the bearing in the motor and the conditions of use and environmental conditions are the premise of selecting suitable bearings. To do this, the following data and information need to be obtained: the function and structure of the mechanical device; the use part of the bearing; the bearing load (size, direction); the rotation speed; vibration, shock; bearing temperature (ambient temperature, temperature rise) ; Ambient atmosphere (corrosiveness, cleanliness, lubricity), etc.