![]() ![]() ![]() If the motor or gearhead is damaged, you would feel a different resistance from one direction to another, hear abnormal noise, or not be able to rotate the shaft at all. ![]() To check for internal damage of a motor or a gearhead, you can remove power and disassemble the motor from gearhead, then manually rotate the shaft clockwise and counterclockwise. The supporting element closest to the load is typically the first component to break. Either way, the motor would cease operation or suffer decreased life. If the permissible axial load is exceeded, then the motor or gearhead bearing may deteriorate and ultimately fail. Exceeding these specifications may result damaging the ball bearings, such as flaking from the raceway and rolling elements, or breaking the output shaft.įor example, if the permissible radial load is exceeded, then the shaft may start bending and ultimately break. Why Are These Specifications Important?īoth radial and axial load specifications are related to the strength, or mechanical rigidity, of the bearings, shaft, and case assembly. A typical axial load is about half the motor weight, although that has increased over the years.įor example, if a motor has a 100 N axial load specification, it means that the motor can hang a 100 N load from its shaft (if the shaft is facing down), or support a load on its shaft (if the shaft is facing up). Axial load is also referred to as the " thrust load" since thrust force and thrust load are forces acting upon the exact same axis. Axial Load (also known as Thrust Load)Īxial Load is defined as the maximum force that can be applied to the shaft in the axial direction (in the same axis as or parallel to the motor shaft axis). Radial loads vary by the distance between the installation point of the overhung load to its support bearing. Radial load is also referred to as the " overhung load" because of how the load may "hang" off the shaft. Radial Load is defined as the maximum force that can be applied to the shaft in the radial direction (any direction perpendicular to the motor shaft axis). Radial Load (also known as Overhung Load) The images below shows an illustration of both radial load (overhung load) and axial load (thrust load) forces acting on a shaft of a motor and a gearhead. The output shaft bearing in the gearhead is typically bigger than the output shaft bearing in the motor because the load on the gearhead shaft would be much bigger than the load on the motor shaft. The entire assembly supports all the static and dynamic forces within the gearhead at its rated load. The gear flange and gear case complete the outer structure. Notice that the bearing supporting the gear shaft (and load) is the largest. ![]() In a gearhead (or gearbox) that is fitted onto the motor's pinion shaft, each toothed gear and output shaft is supported by its own bearing, while the input shaft (motor pinion) is still supported by the motor bearing. The entire assembly supports all the static and dynamic forces within the motor at its rated load. The flange bracket (1) and the motor case (3) complete the outer structure. Outside the rotor and separated by a very thin air gap is the stator (2). A motor's only rotating element is the rotor (4) and shaft (5) assembly, which are supported by two ball bearings (6) on either end. The same axial load and radial load concepts apply to all types of motors. We show the internal structure of an AC motor and its gearhead below. Needless to say, the radial and axial load specifications of a motor or gearhead has a lot to do with its bearings. However, the bearings located closest to the load "bear" most of this burden. For a gear motor, it also includes the gears and additional bearings. The structural strength of a motor comes from the combined mechanical rigidity of its case, flange brackets, and output shaft assembly. A motor's radial load and axial load specifications indicates how long the motor can perform the task. A motor's torque and speed specifications indicate if a motor can perform a task. A motor's structural strength is described by its radial load and axial load specifications. Besides load torque, acceleration torque, speed, and load inertia, overlooking certain sizing parameters during the motor sizing process can literally make or break your machine.Ī motor's performance characteristics are described by its torque and speed specifications. ![]()
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