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.
Source
Transactions of the American Institute of Electrical Engineers>1931>50>2>757 - 767
- Slot design of induction motor has a great influence on its performance. The RMxprt module based on magnetic circuit method can be used to analyze the influence of rotor slot type on motor characteristics and optimize slot parameters. In this paper, the authors take an induction motor of electric vehicle for a typical example.
- 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.
- 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.
- 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.
Abstract
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 Car Racing
Induction Motor Slot Combinations Car Parts
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Kron, Gabriel
- Consulting Engineer, United Research Corp., Long Island City, N. Y.
Induction Motor Slot Combinations Car Bodies
Keywords
Induction motorsRotorsTestingCurrent densityAir gapsStator windingsAnalysis of varianceHarmonic analysisManufacturing processes
Induction motorsRotorsTestingCurrent densityAir gapsStator windingsAnalysis of varianceHarmonic analysisManufacturing processes