How do you mark the magnetic center of a motor?
Identify the correct scribe mark on the shaft that represents the magnetic center. Measure the distance between the scribed mark and the outside bearing housing lip. In the case that the magnetic center scribe mark falls inside the motor housing while at rest, scribe a mark in the rest position.
What is magnetic Centre of motor?
Abstract – All motor rotors have an axial position called a. magnetic center, which is the location where the motor’s axial. magnetic forces are balanced. The magnitude of these axial. magnetic forces that hold the rotor in this position can vary.
Where are the magnets in a motor?
rotor iron
The magnets are embedded in the rotor iron, and a damper winding is placed in slots in the rotor surface to provide starting capability. Such a motor does not, however, have means of controlling the stator power factor.
What is axial play in motor?
The axial play is the total axial displacement of the outer ring against the inner ring.
What is rotor end float?
End float is the amount by which a shaft can move lengthwise. The lubricated grooves allow the hubs to shift if shafts are misaligned or subject to end float.
What is magnetic center of generator?
The Magnetic center is caused due to the magnetic forces between the rotor and stator attract each other. These magnetic forces tend to ensure that the gap between the stator and the rotor is as small as possible.
How do stators work?
The stator is the coil of wire housed inside the engine case. A magnet on a shaft spins within the stator, creating alternating current (AC). That current travels along fairly heavy gauge wire through the case and into the rectifier/regulator which converts it to DC power, and at a consistent output.
What are the 3 different types of stator windings?
Three types of stator windings were considered in the analysis: concentric single layer winding, concentric double layer winding and fractional concentric winding.
What is the role of magnet in motor?
An electric motor uses magnets to create motion. If you have ever played with magnets, you know about the fundamental law of all magnets: Opposites attract and likes repel.
What type of magnets are in motors?
The permanent magnets commonly used in permanent magnet motors include sintered magnets and bonded magnets. The main types are AlNiCo, ferrite, samarium cobalt, neodymium iron boron, and so on.
What is axial and radial play?
Radial play is the clearance measured perpendicular to the bearing axis or more specifically: average outer ring raceway diameter minus average inner ring raceway diameter minus (2 x ball diameter). Axial play is the clearance measured along the bearing axis is known as axial play.
What is the magnetic center of an alignment?
The magnetic center is the driving parameter for alignment and coupling. Failure to consider magnetic center results in axial loads in places they should not be.
How do I adjust the magnetic center of a motor?
To answer your question directly about how to adjust magnetic center: Some motors have slotted holes for the bolts that hold the stator core to the frame (moving the stator core moves magnetic center). Other motors have bearings that can be moved (adjust position of rotor mechanical limits of travel).
When to mark magnetic center of motor?
Magnetic center is a consideration only for horizontal sleeve bearing motors. For those, you can mark magnetic center during uncoupled run (need someone that knows what they’re doing and won’t hurt themselves in the process).
Can a motor at rest be at magnetic center?
A motor at rest may or may NOT be at magnetic center for various reasons. Typically, there is a means of showing the motor’s magnetic center as determined by a factory or shop test run. The prudent man will do a test run with the motor in its final location to verify the REAL magnetic center.