Electric motors are dependent on electromagnets. Turning on an electric motor activates the electromagnets. The magnets then push and pull the wheels and gears in the motor, allowing it to run. The motor will then propel the machine it's powering. Applying more electricity to the motor will increase its speed, as the electromagnets push and pull, the wheels and gears move faster.
 | |||
Armature
In electrical engineering, an armature generally refers to one of the two principal electrical components of an electromechanical machine– a motor or generator, but may also mean the pole piece of a permanent magnet or electromagnet, or the moving iron part of a solenoid or relay. The other component is the field winding or field magnet. The role of the "field" component is simply to create a magnetic field (magnetic flux) for the armature to interact with, so this component can comprise either permanent magnets, or electromagnets formed by a conducting coil. The armature, in contrast, must carry current so it is always a conductor or a conductive coil, oriented normal to both the field and to the direction of motion, torque (rotating machine), or force (linear machine). The armature's role is two-fold. The first is to carry current crossing the field, thus creating shaft torque in a rotating machine or force in a linear machine.
Bearing
A bearing is a device to allow constrained relative motion between two or more parts, typically rotation or linear movement. Bearings may be classified broadly according to the motions they allow and according to their principle of operation as well as by the directions of applied loads they can handle.
Electric Motor Bearing Lubrication Faces New Challenges
The past 10 years have seen a quiet revolution in electric motor bearing relubrication. Adherence to fundamentally sound practices, such as ensuring work area cleanliness during relube and following electric motor OEM lube selection and relube interval recommendations, has gained acceptance as standard operating procedures. Accordingly, many lubrication-related electric motor bearing failures have been reduced.
Principles of operation
A bearing is a device to allow constrained relative motion between two or more parts, typically rotation or linear movement. Bearings may be classified broadly according to the motions they allow and according to their principle of operation as well as by the directions of applied loads they can handle.
There are at least six common principles of operation:- Plain bearing, also known by the specific styles: bushings, journal bearings, sleeve bearings, rifle bearings
- Rolling-element bearings such as ball bearings and roller bearings
- jewel bearings, in which the load is carried by rolling the axle slightly off-center
- fluid bearings, in which the load is carried by a gas or liquid
- magnetic bearings, in which the load is carried by a magnetic field
- flexure bearings, in which the motion is supported by a load element which bends.
- angular contact bearing
How a Bearing Works
The most common type of bearing is the AFBMA-7 C-3 rated bearing. C-3 relates to the internal clearances of the surfaces of the bearing. In most motor rated bearings, there is a clearance of between 3-5 mils (thousandths of an inch) in which lubrication flows to reduce friction and wear of the machined surfaces. The bearing, itself, consists of an inner race, an outer race, balls and a cage which evenly distributes the balls. Common bearings are designed to allow for a radial load with some limited axial loading. ALL BEARINGS ARE LUBRICATED WITH OIL.
No comments:
Post a Comment