Patent US3683268A successfully refreshed from Google Patents.
US3683268A
Expired / Lapsed
US
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Brushless rotary electric machine
Assignee: Mitsubishi Electric Corp
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Filing: 1970-12-14
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Granted: 1972-08-08
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Expires: 1990-12-14
Abstract
Abstract A rotating-field type rotary electric machine is provided on its elongated rotary shaft with a rotor of a rotating armature type a.c. exciter, thyristors and pulse generator, whereby a voltage induced in the rotor of the a.c. exciter is supplied to the rotary field of the rotary electric machine after rectified by the thyristors to become a d.c. exciting current. The d.c. exciting current is controlled by controlling the firing angle of the thyristors by an output pulse from the pulse generator mounted to the rotary shaft.
Inventors
- 👤 Yoshiyuki Obata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:50
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/36; H02K; H02K39/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
A brushless rotary electric machine comprising an a.c. exciter mounted to a rotary shaft of a rotating-field type rotary electric machine, said exciter having a stationary field winding providing selected constant excitation, a plurality of thyristors connected between an output terminal of said a.c. exciter and a field winding of said rotary electric machine, and a pulse generator mounted to said rotary shaft and generating pulse outputs for firing the thyristors, whereby outputs from said rotary electric machine control said pulse generator in terms of the time point whereupon the pulses are generated therefrom to cause said thyristors to serve as rectifiers or inverters.
Claim 2
Dependent Claim
104 words
A brushless rotary electric machine comprising an a.c. exciter mounted to a rotary shaft of a rotating-field type rotary electric machine, said exciter having a stationary field winding providing selected constant excitation, a plurality of thyristors connected between an output terminal of said a.c. exciter and a field winding of said rotary electric machine, and a pulse generator mounted to said rotary shaft and generating pulse outputs for firing the thyristors, whereby outputs from said rotary electric machine control said pulse generator in terms of the time point whereupon the pulses are generated therefrom to cause said thyristors to serve as rectifiers or inverters.
Claim 3
Dependent Claim
29 words
A brushless rotary electric machine as claimed in claim 1, wherein said pulse generator comprises a pair of stationary field magnets the field magnetic poles of which are sharp-pointed.
Claim 4
Dependent Claim
44 words
A brushless rotary electric machine as claimed in claim 1, wherein said rotary shaft has provided thereon a pilot generator for detecting the phase of the output from the a.c. exciter to utilize the output from said pilot generator to control said pulse generator.
Claim 5
Dependent Claim
25 words
A brushless rotary machine as claimed in claim 1, wherein said pulse generator comprises armature windings mounted on said rotary shaft and stationary field windings.
Claim 6
Dependent Claim
37 words
A brushless rotary machine as claimed in claim 4, wherein said field windings of said pulse generator are excited by a permanent magnet generator comprising a stationary winding and a permanent magnet rotating with said rotary shaft.
Claim 7
Dependent Claim
46 words
A brushless rotary machine as claimed in claim 5, wherein said field windings of said pulse generator are connected with said winding of said permanent magnet generator through a phase converter the phase conversion angle of which varies with the output voltage of said rotary machine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |