Induction motors with changeable pole windings in the ratio 1:4

This paper presents a simple and general mathematical formulation for the determination of the differential leakage factor for both symmetrical and asymmetrical full and deadcoil windings of electrical machines. The method can be applied to all multi-phase windings and considers Görges polygons in conjunction with masses geometry in order to find an easy and affordable way to compute the differential leakage factor, avoiding the adoption of traditional methods that refer to the Ossanna's infinite series, which has to be obviously truncated under the bound of a predetermined accuracy. Moreover, the method described in this paper allows the easy determination of both the minimum and maximum values of the differential leakage factor, as well as its average value and the time trend. The proposed method, which does not require infinite series, is validated by means of several examples in order to practically demonstrate the effectiveness and the easiness of application of this procedure.

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“…The leakage factor is defined with the following general formula [1], [2], [11], [13]- [15], [17], [30]- [32]:…”

Section: Differential Leakage Factor: a Literature Reviewmentioning

confidence: 99%

“…With regards to asymmetrical windings, which present different winding factors for each phase, Heller et al [12] demonstrated the following expression of the differential leakage, which was also described and used by Cistelecan et al [22], [32]:…”

Section: Differential Leakage Factor: a Literature Reviewmentioning

confidence: 99%

A General Mathematical Formulation for the Determination of Differential Leakage Factors in Electrical Machines With Symmetrical and Asymmetrical Full or Dead-Coil Multiphase Windings

Caruso

Tommaso

Genduso

et al. 2018

IEEE Trans. on Ind. Applicat.

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“…In most cases these mechanisms operate under intense working conditions and with a high switching rate (up to 200 cycles/h). As investigations have shown [2,3], in electrical drives of this type a speed ratio of 1:4 is the most favourable, since with this ratio it is possible to reduce substantially electrical energy losses, and also the weight and size of the motors. Motors now in use usually have two separate windings on the stator for the two speeds.…”

Section: Introductionmentioning

confidence: 99%

Pole-changing motor for lift installation

et al. 2020

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The Numerous lift installation require two speeds of rotation for the work. One of them is necessary for lifting, and another for exact stop of a cabin at a level of a floor. Now in these installations two speed motors with two separate windings are used. In this paper the opportunity of creation of the highly effective two-speed motor with pole-changing winding for lifts and elevator installations is considered. The industrial test results of motors with such windings are shown. The advantages of motors with pole-changing windings over conventional motors with two separate windings are given.

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“…Since pole-changing techniques can vary the operational frequency, many studies have been reported on their effectiveness [4][5][6][7]. To apply the pole-changing techniques for motors, the motor driven area can be expanded.…”

Section: Introductionmentioning

confidence: 99%

“…Since vehicles move using only the motor output in EVs, the above torque shock is directly transmitted to the driver. The other method uses multiple inverters with more controllable current phases than in the case of ordinary three‐phase inverters . To change the pole, the input current phase of each stator slot is optimized by current control.…”

Section: Introductionmentioning

confidence: 99%

A novel pole‐changing method with multiple three‐phase inverters

Hidaka

Takagi

Komatsu

et al. 2019

IEEJ Transactions Elec Engng

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This paper presents a new pole‐changing method with multiple three‐phase inverters. Since the number of controllable current phases is much larger than that in conventional methods, a higher winding factor can be obtained in both high‐ and low‐pole driving modes. To evaluate the magnetic characteristics of the proposed method, magnetomotive force analysis is conducted based on Fourier series expansion and finite element method (FEM). Moreover, mutual inductance is compared between high‐ and low‐pole drives using FEM. To validate the effectiveness, an efficiency map is evaluated by using a prototype induction motor. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Induction motors with changeable pole windings in the ratio 1:4

Cited by 16 publications

References 2 publications

A General Mathematical Formulation for the Determination of Differential Leakage Factors in Electrical Machines With Symmetrical and Asymmetrical Full or Dead-Coil Multiphase Windings

A General Mathematical Formulation for the Determination of Differential Leakage Factors in Electrical Machines With Symmetrical and Asymmetrical Full or Dead-Coil Multiphase Windings

Pole-changing motor for lift installation

A novel pole‐changing method with multiple three‐phase inverters

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