Induction Motor Slot Combinations

Posted on by admin

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

  1. Induction Motor Slot Combinations Car Bodies
  2. Induction Motor Slot Combinations
  3. Induction Motor Slot Combinations List

Abstract

  1. 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.
  2. Based on the above considerations, it can be stated that the magnetic wedges can reduce losses in a semi-closed-slot induction motor. However, this solution increases the stator leakage reactance. This increase in turn reduces the starting current and decreases the starting torque of the motor even more.

The manual design of induction motor is the combination of lengthy calculations and special attention. The possible stator-rotor slot combinations for four pole.

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

Source

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

Abstract

Induction Motor Slot Combinations Car Bodies

Slot
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

journal ISSN : 0096-3860
DOI 10.1109/T-AIEE.1931.5055866

Authors

Induction Motor Slot Combinations

User assignment

Assignment remove confirmation

You're going to remove this assignment. Are you sure?

Induction Motor Slot Combinations List

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

Additional information

Publisher

Fields of science

Fields of science

    Share

    Export to bibliography