Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Mechanically coupled in fixed ratio of movement
Patent
1977-08-15
1978-10-24
Dobeck, B.
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Mechanically coupled in fixed ratio of movement
318 71, 310112, H02P 768, H02K 3700
Patent
active
041223772
ABSTRACT:
A variable speed, alternating current motor unit which operates continuously in a stepless manner and delivers full torque over a speed range from zero to maximum speed. The unit includes two induction motors which are mounted side-by-side in a housing. Each induction motor is a polyphase, squirrel cage induction motor with a rolled shell stator wound core and an associated rotor core. The stator elements are each equipped with a double shaft extension, and the rotor elements are also each equipped with a double shaft extension. The stator elements are suitably journaled in antifriction bearings which are mounted in the housing. The rotor elements are journaled in the housing in a similar manner. The stator elements are mechanically linked by a gear train so that rotation of one stator element opposes rotation of the other stator element when both of the induction motors are energized. Consequently, the stator elements buck one another and torque is induced in the rotor elements. In one embodiment, the rotor elements are mechanically linked by another gear train to a common output shaft. As a result, when both of the induction motors are energized, additive torque is imparted by the unit to the common output shaft to drive any connected load. In a second embodiment, the rotor elements are mechanically linked, as by means of respective gear trains, to separate output shafts. As a result, when both of the induction motors are energized, equal torque is imparted by the unit to each of the separate output shafts to drive separate connected loads. The side-by-side arrangement provides a compact, lightweight unit. The second embodiment may be advantageously employed in the propulsion system for a vehicle, for example. An eddy current brake to simulate engine braking in an internal combustion engine as well as to provide a no-fade brake system and/or a locked-up differential may be provided in combination with the unit when the unit is utilized in a vehicle. The unit further includes a speed control circuit to control energization of the unit to provide a desired speed over a speed range from zero to maximum speed at full torque. The speed control circuit enables precise and highly responsive speed regulation. In a unit which was constructed in accordance with a preferred embodiment, the unit operated with precise speed regulation of better than plus-or-minus 3 percent.
REFERENCES:
patent: 2787747 (1957-04-01), Drummond
patent: 3434025 (1969-03-01), Parkinson et al.
patent: 3539887 (1970-11-01), Dennick
patent: 3562567 (1971-02-01), Carini
patent: 3771032 (1973-11-01), Hender
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