Effects of stator slot magnetic wedges on the induction motor performances

Madescu, Gheorghe; Greconici, Marian; Biriescu, Marius; Moţ, Marţian

doi:10.1109/optim.2012.6231861

Cited by 29 publications

(14 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The range of s is narrow, so the value of R2 ' (1-s)/s is mainly decided by R2 ' . Based on Table V, the variation tendencies of IM-1~IM-5's I1 and PCu are listed in Table VII. The PCu is mainly influenced by I1 in (9). The I1 of the IM-1 and IM-4 is little changed, so their PCu is close to the Y2-180L-4's.…”

Section: Stator Stranded Lossmentioning

confidence: 86%

See 1 more Smart Citation

Influence of mechanical parameters on power efficiency of induction motors

Shen

2014

2014 17th International Conference on Electrical Machines and Systems (ICEMS)

View full text Add to dashboard Cite

This paper aims to investigate the influence of mechanical parameters, such as the dimensions of air-gap, stack length, stator and rotor slots as well as the number of rotor slots, on the induction motor efficiency. Two Chinese standard induction motors (22kW/Y2-180L-4 and 22kW/Y-180L-4) are comparatively studied with finite element analysis (FEA). Based on the results, the efficiency of the induction motor is improved by optimizing the mechanical parameters. The analysis results can be beneficial for future design of high-efficiency induction motors.

show abstract

Section: Stator Stranded Lossmentioning

confidence: 86%

“…Many methods have been used to depress the effect of slotting to improve the efficiency of the induction motors, such as magnetic wedges used in the stator slots [9], rotor skewing [10], new shapes of slots and so on.…”

Section: Introductionmentioning

confidence: 99%

Influence of mechanical parameters on power efficiency of induction motors

Shen

2014

2014 17th International Conference on Electrical Machines and Systems (ICEMS)

View full text Add to dashboard Cite

show abstract

“…This is due to higher magnetizing reactance obtained in simulation by ignoring the flux fringing at the edges of the teeth as well as the stator and rotor core reluctances [16]. These effects can be included by using the effective air gap concept, which is somewhat larger than the mechanical air gap [17]. As several simulations with a gradual increase in the air gap indicated, for an effective air gap equal to 1.95 times g 0 , the necessary agreement between the simulated and practical measured no-load currents is achieved.…”

Section: Simulation Of Scim With Oil-whirl Faultmentioning

confidence: 99%

Oil-Whirl Fault Modeling, Simulation, and Detection in Sleeve Bearings of Squirrel Cage Induction Motors

Ojaghi

Yazdandoost

2015

IEEE Trans. Energy Convers.

View full text Add to dashboard Cite

Bearings are divided into two main categories: rolling bearings and sleeve bearings. The sleeve bearings are normally used in electrical machines above 200-hp rating. In this paper, dynamic modeling and simulation of a squirrel cage induction motor with sleeve bearings under oil-whirl fault is performed. The required air gap function under the fault is defined using earlier experimental results. Then, a winding function approach is used for modeling and simulation of the motor with faulty sleeve bearings. Accuracy of the simulation is approved by comparison to the corresponding experimental results. The stator line current harmonics produced by the bearing oil-whirl fault are identified, and the best harmonics as the fault index are chosen considering sensitivity of the harmonics to the fault severity, as well as the load level change and supply voltage unbalance. Selected index is used to determine the severity of oil-whirl fault in sleeve bearing of an induction motor working in a real production line.

show abstract

“…The benefits of the use of magnetic wedges are not limited to reduce harmonics in the air gap MMF but extend to reduce load current, additional losses (associated to the zig zag flux) and losses in the magnetic core [2] [3]. However, if indiscriminately increases the value of the relative permeability of wedges, or certain conditions are not respected in their geometry, there may be negative effects such as a significant reduction in startup torque and maximum torque or an increase in the dispersion flux [4].…”

Section: Introductionmentioning

confidence: 99%

Fault detection in magnetic wedges of induction motor

Bossio¹,

Barrera²,

Bossio³

et al. 2015

2015 IEEE 24th International Symposium on Industrial Electronics (ISIE)

View full text Add to dashboard Cite

In high power electric motors it is common to use open slots to facilitate the assembly of the coils. Open slots introduce harmonics in the magnetomotive force distribution over the air gap, resulting in additional losses and parasitic torques. In order to reduce these effects, wedges of magnetic material are used. These wedges are prone to apartial or total detachment, which in turn may result in other failures. In this paper a strategy to detect faults in magnetic wedges is presented. This strategy consists of the injection of a zero sequence voltage signal of high frequency. The resulting currents are highly dependent on the magnetic irregularities both the rotor and stator and thus sensitive to asymmetries produced by faults in the wedges. In this way, it is possible to detect and quantify wedges faults without the need to disassemble or remove the IM from the production line. The proposed strategy is applicable offline and required only disconnect the motor of the power supply. Laboratory experimental results are presented to validate the proposal.

show abstract

Effects of stator slot magnetic wedges on the induction motor performances

Cited by 29 publications

References 9 publications

Influence of mechanical parameters on power efficiency of induction motors

Influence of mechanical parameters on power efficiency of induction motors

Oil-Whirl Fault Modeling, Simulation, and Detection in Sleeve Bearings of Squirrel Cage Induction Motors

Fault detection in magnetic wedges of induction motor

Contact Info

Product

Resources

About