Patent US3733504A successfully refreshed from Google Patents.
US3733504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self supporting rotary electrical device
Assignee: HAROWE SERVO CONTROLS Inc
•
Filing: 1971-07-27
•
Granted: 1973-05-15
•
Expires: 1991-07-27
Abstract
Abstract A magnetic sleeve is disposed in the space between the stator and the rotor of a hysteresis synchronous motor. The sleeve supports the stator and closes internal slots in the stator core. The sleeve also carries bearings for mounting the rotor for relative movement with respect to the stator.
Inventors
- 👤 J Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:18
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/16; H02K5/173; H02K5/1732; H02K19/00; H02K19/02; H02K19/04; H02K19/08; H02K5/12; H02K5/128
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
230 words
A hysteresis synchronous motor comprising: a stator core comprising a plurality of radially extending, angularly spaced teeth having slots therebetween opening into a rotor tunnel of said stator core through an interrupted subStantially cylindrical surface formed by said teeth; a stator winding wound in said slots of said stator core for developing a rotating field upon excitation of said stator winding; a rotor comprising a magnetic material having a high hysteretic constant, said rotor extending through said rotor tunnel of said stator core spaced from said substantially cylindrical surface; a pair of bearing means for rotatably supporting said rotor at opposite sides of said stator; and sleeve means including a pair of sleeve members comprising a magnetic material, each of said members including a first section of lesser thickness having substantially uniform inside and outside diameters and a second section of greater thickness having a maximum outside diameter greater than the outside diameter of said first section, said first section of said members extending into said rotor tunnel from opposite sides of said stator so as to form a relatively thin sleeve portion extending substantially through said tunnel for supporting said stator and closing said stator slots thereby reduciNg parasitic hysteresis losses, said second section of said members extending away from opposite sides of said stator so as to provide a relatively thick sleeve portion for supporting said bearing means.
Claim 2
Dependent Claim
230 words
A hysteresis synchronous motor comprising: a stator core comprising a plurality of radially extending, angularly spaced teeth having slots therebetween opening into a rotor tunnel of said stator core through an interrupted subStantially cylindrical surface formed by said teeth; a stator winding wound in said slots of said stator core for developing a rotating field upon excitation of said stator winding; a rotor comprising a magnetic material having a high hysteretic constant, said rotor extending through said rotor tunnel of said stator core spaced from said substantially cylindrical surface; a pair of bearing means for rotatably supporting said rotor at opposite sides of said stator; and sleeve means including a pair of sleeve members comprising a magnetic material, each of said members including a first section of lesser thickness having substantially uniform inside and outside diameters and a second section of greater thickness having a maximum outside diameter greater than the outside diameter of said first section, said first section of said members extending into said rotor tunnel from opposite sides of said stator so as to form a relatively thin sleeve portion extending substantially through said tunnel for supporting said stator and closing said stator slots thereby reduciNg parasitic hysteresis losses, said second section of said members extending away from opposite sides of said stator so as to provide a relatively thick sleeve portion for supporting said bearing means.
Claim 3
Dependent Claim
48 words
The hysteresis synchronous motor of claim 1 comprising a retaining ring for holding one of said pair of bearing means axially in place with said sleeve means, one of said sleeve members including an annular groove in said second section of increased thickness for receiving said retaining ring.
Claim 4
Dependent Claim
50 words
The hysteresis synchronous motor of claim 2 further comprising another retaining ring for holding the other of said bearing means axially in place within said sleeve means, the other of said sleeve members including an annular groove in said second section of increased thickness for receiving said other retaining ring.
Claim 5
Dependent Claim
47 words
The hysteresis synchronous motor of claim 2 wherein said second section extends radially outwardly in the vicinity of said groove so as to permit a minimum inside diameter for said sleeve means at said retaining ring substantially equal to said uniform inside diameter of said first section.
Claim 6
Dependent Claim
163 words
A self-supporting electro-magnetic device comprising: a stator core having a central rotor tunnel; a stator winding wound on said core for developing a stator field upon excitation of said stator winding; a rotor extending through said tunnel of said stator core; a pair of bearing means for rotatably supporting said rotor on opposite sides of said stator; and sleeve means including a pair of sleeve members, each of said members including a first section of lesser thickness having substantially uniform inside and outside diameters and a second section of greater thickness having a maximum outside diameter greater than the outside diameter of said first section, said first section of said members extending into said rotor tunnel from opposite sides of said stator so as to form a thin stator-supporting sleeve portion extending substantially through said tunnel, said second sections of said members extending away from said rotor tunnel on opposite sides of said stator so as to provide support for said bearing means.
Claim 7
Dependent Claim
163 words
A self-supporting electro-magnetic device comprising: a stator core having a central rotor tunnel; a stator winding wound on said core for developing a stator field upon excitation of said stator winding; a rotor extending through said tunnel of said stator core; a pair of bearing means for rotatably supporting said rotor on opposite sides of said stator; and sleeve means including a pair of sleeve members, each of said members including a first section of lesser thickness having substantially uniform inside and outside diameters and a second section of greater thickness having a maximum outside diameter greater than the outside diameter of said first section, said first section of said members extending into said rotor tunnel from opposite sides of said stator so as to form a thin stator-supporting sleeve portion extending substantially through said tunnel, said second sections of said members extending away from said rotor tunnel on opposite sides of said stator so as to provide support for said bearing means.
Claim 8
Dependent Claim
48 words
The self-supporting electro-magnetic device of claim 5 comprising a retaining ring for holding one of said pair of bearing means axially in place with said sleeve means, one of said sleeve members including an annular groove in said second section of increased thickness for receiving said retaining ring.
Claim 9
Dependent Claim
50 words
The self-supporting electro-magnetic device of claim 6 further comprising another retaining ring for holding the other of said bearing means axially in place within said sleeve means, the other of said sleeve members including an annular groove in said second section of increased thickness for receiving said other retaining ring.
Claim 10
Dependent Claim
47 words
The self-supporting electro-magnetic device of claim 6 wherein said second section extends radially outwardly in the vicinity of said groove so as to permit a minimum inside diameter for said sleeve means at said retaining ring substantially equal to said uniform inside diameter of said first section.
References Cited (Backward Citations)
US2328743A
Cited
US2547599A
Cited
US2741990A
Cited
US2911549A
Cited
US2994795A
Cited
US3195466A
Cited
US3231768A
Cited
US3229130A
Cited
US3228341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |