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Motor magnetic center line

source：未知 time：2025-01-13 09:48nbsp; click：

The magnetic centerline of the motor refers to the projection point on the rotor axis of a resultant force point generated by the magnetic field force acting on the rotor after the motor is powered on. Simply put, the magnetic field force acts on the rotor, causing the rotor to generate a resultant force, and the intersection of the line of action of this resultant force and the shaft is the magnetic centerline.

Importance of the magnetic centerline

Balance the magnetic force of the motor: The position of the magnetic centerline directly affects the balance of the motor. If the magnetic centerline is not on the centerline of the shaft, radial magnetic pull will be generated, causing the rotor to vibrate and affecting the running stability of the motor.

Reduce mechanical vibration: The misalignment of the magnetic centerline and the shaft centerline will cause the motor to generate radial force, causing additional load on the bearing, accelerating bearing wear, and generating greater vibration noise.

Improve motor efficiency: The coincidence of the magnetic centerline and the shaft centerline can reduce the loss of magnetic field energy and improve the efficiency of the motor.

Factors affecting the position of the magnetic centerline

Motor structure: The size, shape, and air gap size of the motor core will affect the position of the magnetic centerline.

Winding distribution: The distribution mode and number of turns of the winding will also affect the position of the magnetic centerline.

Manufacturing error: Processing error, assembly error, etc. will cause the magnetic centerline to deviate from the centerline of the shaft.

Consequences of non-coincidence of magnetic centerlines

Vibration and noise: Generate radial force, causing bearing vibration and noise.

Shortened bearing life: The bearing bears additional radial loads, accelerating wear.

Reduced motor efficiency: Increased magnetic field energy loss leads to reduced motor efficiency.

Impact on motor life: Severe vibration and imbalance will affect the life of the motor.

How to determine the magnetic centerline?

Experimental method: Determine the position of the magnetic centerline by measuring the vibration amplitude of the motor at different positions.

Finite element analysis: Use finite element analysis software to simulate and calculate the motor magnetic field to determine the position of the magnetic centerline.

Magnetic centerline correction

Mechanical adjustment: Adjust the position of the rotor or stator to make the magnetic centerline coincide with the centerline of the shaft.

Winding adjustment: By adjusting the distribution of the windings, the magnetic field distribution is changed, and the magnetic center line is moved to the ideal position.

Summary

The magnetic center line is a very important parameter in motor design and manufacturing, which directly affects the performance and life of the motor. Through reasonable structural design and manufacturing process, the magnetic center line can be controlled within a smaller range, thereby improving the performance and reliability of the motor.
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