DC motor with increased rotor resistance

Electrical generator or motor structure – Dynamoelectric – Rotary

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310 72, H02K 1716, H02K 1100

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active

054951321

ABSTRACT:
A brushless DC motor in which increased rotor resistance is used to facilitate very frequent reversals. The rotor endcap is thinned down to the point where the resistance seen by the path of the current loop through one of said endcaps, is at least one-half as much as the resistance seen by the portion of said current loop which flows along the length of one of said rotor bars.

REFERENCES:
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patent: 3670283 (1972-06-01), Ronk
patent: 3685142 (1972-08-01), Deming
patent: 3780324 (1973-12-01), Greenwell
patent: 3987324 (1976-10-01), Linkous
patent: 4149114 (1979-04-01), Gorjan
patent: 4158225 (1979-06-01), Hertz
patent: 4249098 (1981-02-01), Karlen et al.
patent: 4562397 (1985-12-01), Kitabayashi et al.
patent: 5045742 (1991-09-01), Armstrong et al.
patent: 5124606 (1992-06-01), Eisenbeis
IEEE Transactions on Magnetics, vol. 13, No. 6, Nov. 1979, pp. 1473-1475, by Mulukutla S. Sarma, "Current-Density Distribution in Solid-Rotor Induction Motor".
IEEE Transactions on Power Apparatus and Systems, vol. 91, No. 5, pp. 1803-1811, by Buchanan et al., "Rotor Current and Magnetic Field Variations in Induction Motors with Skewed Rotors", Feb. 1972.
Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting, (Cat. No. 90CH2935-5), pp. 8-11, vol. 1, by G. Kovacs, "Starting Disc Rotor for High-Output Two-Pole Induction Motors".
IEEE Transactions on Energy Conversion, vol. 5, No. 4, pp. 719-724, by Belmans et al., "A Circuit Approach to Finite Element Analysis of a Double Squirrel Cage Induction Motor", Jul. 1990.
IEEE Transactions on Energy Conversion, vol. 4, No. 4, pp. 671-680, by Mukherjee et al., "FEM Analysis of Inverter-Induction Motor Rotor Conduction Losses", Feb. 1989.
Electric Motors, 5th Edition, 1991, pp. 133-144, "Squirrel-Cage Motors".

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