Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Mechanically coupled in fixed ratio of movement
Patent
1977-06-16
1978-11-21
Dobeck, B.
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Mechanically coupled in fixed ratio of movement
318 48, 318488, 318646, H02N 2902
Patent
active
041268180
ABSTRACT:
A hybrid stepping motor unit includes a stepper-type primary motor and a secondary motor. The rotor shafts of the stepper-type primary motor and the secondary motor are connected to a common output shaft. The stepper-type primary motor is energized in response to an electrical command signal from an external source, such as a computer. When the stepper-type primary motor is energized, the stepper-type primary motor produces torque and attempts to drive the load combination of the interconnected rotor shafts, the common output shaft, and any mechanical load on the common output shaft, such as a machine tool component. This produces a reaction torque on the stepper-type primary motor. A transducer converts the reaction torque into an electrical control signal. The secondary motor is energized in response to the electrical control signal from the transducer. When the secondary motor is energized, the secondary motor produces torque which augments the torque of the stepper-type primary motor to drive the load circulation. After the rotor shaft of the stepper-type primary motor rotates a predetermined angular distance, a reaction torque on the stepper-type primary motor is no longer produced. The electrical control signal from the transducer ceases, and the secondary motor is de-energized. Consequently, application of torque to the common output shaft is discontinued. The hybrid stepping motor unit responds to successive electrical command signals in like manner to drive the common output shaft a preselected angular distance in response to each electrical command signal.
REFERENCES:
patent: 2604613 (1952-07-01), Klass
patent: 3739252 (1973-06-01), Hays et al.
patent: 3809989 (1974-05-01), Hays et al.
patent: 3836834 (1974-09-01), Abbatiello et al.
patent: 3940677 (1976-02-01), Morino et al.
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