Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1976-10-18
1979-04-24
Scott, Samuel
Electrical generator or motor structure
Dynamoelectric
Rotary
310 42, 64 1V, 306237A, 308DIG13, H02K 1514, F16C 100
Patent
active
041514300
ABSTRACT:
A shaft of selected material and of a given desired nominal diameter corresponding to nominal desired shaft extension diameter for a particular motor is cut and then treated with optional operations such as chamfering and washing; grinding; machining of flats; and phosphatizing to inhibit rust. A first accessory member is assembled in a predetermined position by heat shrinking on the shaft; and a rotor body is assembled with the shaft. A second accessory member is also assembled by heat shrinking. For ball bearing applications, concenntric journals are turned on accessory members for the inner races of bearings after the accessory members have been assembled with shaft. The inner races of ball bearings are lightly pressed onto the journals, and rotors, end frames, and stator are assembled. The concentric journals permit press fitting of ball bearings without substantially exceeding 0.0005 of an inch press fit and thus avoid damage to the bearings.
Shaft portions are stressed and maintained in a stressed condition so as to increase the stiffness of the rotor system and thereby increase the rotor system resonant frequency. Aluminum collars that conform to the shaft surface are preferably used. These collars establish a more thorough and uniformly stressed condition of the shaft.
REFERENCES:
patent: 693247 (1902-02-01), Edwards
patent: 2438621 (1948-03-01), Schoeppel
patent: 2769934 (1956-11-01), Stone
patent: 2947893 (1960-08-01), Bussone
patent: 3664228 (1972-05-01), Hasz
patent: 3793543 (1974-02-01), Stokke
patent: 3827134 (1974-08-01), Welchsler
patent: 3909642 (1975-09-01), Busian
patent: 3990141 (1976-11-01), Stark
patent: 4031610 (1977-06-01), Singh
"The Longer Life Motors", pub. by General Electric, Oct. 1972.
"Friction for Damping", by Burt Zimmerman, in Product Engineering, 11/22/65.
General Electric Company
Krisher, Jr. Ralph E.
Scott Samuel
Turner R. C.
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