Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-08-23
1992-09-22
Rudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
188267, 310 77, 318758, F16D 6300, H02K 4904, H02K 7104
Patent
active
051499983
ABSTRACT:
A dynamic braking means for a variable speed dynamoelectric eddy current drive consists of an ac motor (4) rotationally coupled through a shaft (6) to an inductor drum assembly (13) of an eddy current coupling (3), where an annular field coil 12 generates an electromagnetic field which couples the inductor drum assembly to a pole assembly (10) which is rotationally coupled to an output shaft (16) which drives an inertial load (20). Upon command to stop and brake, a controller (30) signals a motor switch (26) to disconnect the ac motor from the ac source and connect it to a dc source, causing a braking torque to be produced. Concurrently, the controller signals a coupling switch (28) to go to an open position momentarily until the motor decelerates to approximately zero speed, whereupon the coupling switch is again closed, coupling the inertial load to the motor, thereby providing a braking action. The major portion of dissipated kinetic energy is thus shifted from motor to coupler, which has a higher heat capacity.
REFERENCES:
patent: 3250975 (1966-05-01), Pepper
patent: 3277357 (1966-10-01), Willis
patent: 5054587 (1991-10-01), Matsu et al.
patent: 5057728 (1991-10-01), Dammeyer et al.
Eaton Corporation
Rebsh D. L.
Rudy R.
Uthoff, Jr. L. H.
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