Influence of magnetic forces and magnetostriction on the vibration behavior of an induction motor

Abstract

This paper presents the vibration analysis and results of an induction motor through two kinds of magnetomechanical coupling methods. The computation results are validated by comparing them with the vibration measurements of the motor. The role of both the magnetic forces and magnetostriction are examined and distinguished based on their contribution to the vibration behavior of the machine. It was found that the pole pair number of an induction machine can affect the way the vibrations caused by magnetostriction and magnetic forces either add up or oppose each other.

Stress Monitoring of Prestressed Steel Strand Based on Magnetoelastic Effect Under Weak Magnetic Field Considering Material Strain

“…Besides, reducing the winding layers also reduced the difficulty of producing and installing the sensor. For sensors with the same length of magnetic path, the monitoring accuracy decreased with the increase of the number of turns, which agreed with Equation (14) and Equation (16). To improve monitoring accuracy, the number of turns should be reduced.…”

“…For a certain collection instrument, the inductance of the sensor controlled the value of the measurement error. Combining Equation (12) and Equation (15), the error of the calculated stress was expressed as Equation (16), where σ error is the error of the stress, σ cal the calculated stress, and σ a the actual value of the stress. When the test instrument was specified, the error of the stress monitoring increased with the increase of the turns of the sensor and decreased with the length of the magnetic path of the sensor.…”

“…The stress monitoring based on the magnetoelastic effect method is mainly used for cables and external prestressing tendons. The magnetoelastic effect method obtains the stress by measuring electromagnetic parameters [15], such as magnetic permeabilities [16], induced magnetic inductances [1], and the signal of magneto-electric sensors [17]. The magnetoelastic effect method has the characteristics of good dynamic response and little environmental impact.…”

“…The magnetoelastic effect method has the characteristics of good dynamic response and little environmental impact. Traditional coil-based sensors [16,18] and elasto-magneto-electric sensors [17] contain an excitation unit and an induction unit [19]. The sensor is large and requires a large excitation current, thus embedding the sensor in structure is difficult and it is unsuitable for stress monitoring of internal prestressing tendons.…”

Trends and Challenges in Intelligent Condition Monitoring of Electrical Machines Using Machine Learning

“…Winding Short Circuit [23,24] Rotor Broken Bar(s) [25] Eccentricity [26,27] Bearing Faults [28] vibration × × × -the most preferable parameter for condition monitoring; -parameter can be used for condition monitoring; × × ×-parameter cannot be used for condition monitoring.…”