Induction Motor Slot Combinations

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Transactions of the American Institute of Electrical Engineers>1931>50>2>757 - 767

Induction Motor Slot Combinations

Abstract

The impact of the rotor slot number selection on the induction motors is investigated. Firstly, analytical equations will reveal the spatial harmonic index of the air gap magnetic flux density, connected to the geometrical features and the saturation of the induction motor. Then, six motors with different rotor slot numbers are simulated and studied with FEM. The stator is identical in all. The minimum value of slot pitch of a 3 phase induction motor is 15 mm. Write the formula for air-gap in case of three phase induction motor in terms of length and diameter. The length of air-gap, lg = 0.2 + 2 SQRT (D L) in mm. Solution: Slot per pole: 3.3 =9 For this machine design configuration, the suitable stator and pole combinations are: 18 stator slots with 2 poles 36 stator slots with 4 poles and goes on depending on your machine size. In this video I try to explain About 48 slot 3-phase 4-Pole Induction motor winding process and calculations all data with Diagram. I think this Video will h.

A theory of coexisting stationary and rotating slot openings is developed with the aid of ``revolving permeances,' and the magnitude and speed of the parasitic fluxes due to the slot openings and the fundamental current density wave are found. It is shown that the interaction of the fundamental flux and a parasitic flux of the same order of magnitude as the fundamental flux causes the vibrations, objectionable noises, and crawlings of induction motors. The existence of these ruinous irregularities depends only in the difference of slots, the number of poles, and in some cases on the critical speeds of the rotor for circular or tortional vibrations, and is independent of the number of phases or the type of winding. Three rules are developed for the determination of destructive vibrations and noise, eight rules for establishing crawling speeds, and eight rules for finding hooks in the speed-torque curves of induction motors.

Identifiers

Induction Motor Slot Combinations Car Bodies

Induction Motor Slot Combinations
journal ISSN : 0096-3860
DOI 10.1109/T-AIEE.1931.5055866
Induction Motor Slot Combinations

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Induction Motor Slot Combinations Car Parts

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Kron, Gabriel

  • Consulting Engineer, United Research Corp., Long Island City, N. Y.

Keywords

Induction motorsRotorsTestingCurrent densityAir gapsStator windingsAnalysis of varianceHarmonic analysisManufacturing processes

Induction motorsRotorsTestingCurrent densityAir gapsStator windingsAnalysis of varianceHarmonic analysisManufacturing processes

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Induction Motor Slot Combinations List

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Induction Motor Slot Combination

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Induction Motor Slot Combinations Car Racing

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The impact of different stator and rotor slot number combinations on iron losses of a three-phase induction motor at no-load

Abstract

The electromechanical characteristics of induction motors depend on the used stator and rotor slot combination. The correlation between the usage of different stator and rotor slot number combinations, magnetic flux density distributions, no-load iron losses and rated load winding over-temperatures for a specific induction motor is presented. The motor's magnetic field was analyzed by traces of the magnetic flux density vector, obtained by FEM. Post-processing of FE magnetic field solution was used for posterior iron loss calculation of the motor iron loss at no-load. The examined motor stator lamination had 36 semi-closed slots and the rotor laminations had 28, 33, 34, 44 and 46 semi-closed slots.


Publication:
Pub Date:
2008
DOI:
10.1016/j.jmmm.2008.04.059
Bibcode:
2008JMMM..320E.891M