US3555323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Small synchronous motor
Assignee: Johnson Electric Switzerland AG
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Filing: 1969-05-07
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Granted: 1971-01-12
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Expires: 1989-05-07
Abstract
Abstract A small synchronous motor of the type having a rotor with permanent-magnet poles and a cagelike stator in the form of a closed ring enclosing an exciting coil and having at its inner side groups of axially extending main poles and of shaded auxiliary poles, the utilization of the available space and the efficiency of shading discs being improved and the number of poles and magnetic flux increased by providing one single group of main poles and one single group of auxiliary poles, each group occupying one-half of the stator circumference.
Inventors
- 👤 Hermann Gerber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:20
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/14; H02K21/145; H02K2201/00; H02K2201/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
95 words
A small synchronous motor having a rotor with permanentmagnet poles and a cage- like stator in the form of a closed ring enclosing an exciting coil and having at its inner side groups of axially extending main poles and of auxiliary poles phase shifted by means of short - circuiting discs, characterized by one single group only of each main poles and auxiliary poles, each group extending through substantially one half of the stator circumference, and said auxiliary poles being shaded by shortcircuiting discs engaging between auxiliary poles and main poles in two places each.
Claim 2
Dependent Claim
95 words
A small synchronous motor having a rotor with permanentmagnet poles and a cage- like stator in the form of a closed ring enclosing an exciting coil and having at its inner side groups of axially extending main poles and of auxiliary poles phase shifted by means of short - circuiting discs, characterized by one single group only of each main poles and auxiliary poles, each group extending through substantially one half of the stator circumference, and said auxiliary poles being shaded by shortcircuiting discs engaging between auxiliary poles and main poles in two places each.
Claim 3
Dependent Claim
82 words
A motor according to claim 1, wherein the main poles and auxiliary poles are disposed in a common cylindrical surface and the rotor is excentrically shifted towards the group of auxiliary poles, the ratio of total main flux to total auxiliary flux being thereby optimally adjusted by selection of the excentricity and the ratio of the mean width of the air gap between the group of main poles and the rotor and between the group of auxiliary poles and the rotor respectively.
Claim 4
Dependent Claim
51 words
A motor according to claim 2, wherein the stator has mounting holes coaxially disposed with respect to the rim of poles, and the bearings mounted in said holes having bores receiving the rotor shaft, said bores being excentrically disposed within an outer mounting surface of the bearing seated in said holes.
Claim 5
Dependent Claim
26 words
A motor according to claim 1, wherein all auxiliary poles of each polarity extend through a substantially semicircular slit of said short-circuiting disc associated to them.
Claim 6
Dependent Claim
28 words
A motor according to claim 4, wherein the short-circuiting discs have an aperture receiving The rotor shaft, said aperture being limited by two webs enclosing the rotor shaft.
Claim 7
Dependent Claim
37 words
A motor according to claim 1, wherein the auxiliary poles have a first portion extending radially outwardly between said short-circuiting disc and the rotor and a second portion extending axially between the rotor and the exciting coil.
Claim 8
Dependent Claim
19 words
A motor according to claim 6, wherein the short-circuiting discs are disposed radially and axially inside the exciting coil.
Claim 9
Dependent Claim
21 words
A motor according to claim 6, wherein the auxiliary poles are stamped from the stator sheets and are bent in Z-shape.
Claim 10
Dependent Claim
35 words
A motor according to claim 6, having two rims of auxiliary poles in the form of stamped parts wherein the poles of each rim are interconnected by a connecting web riveted to the stator sides.
Claim 11
Dependent Claim
49 words
A motor according to claim 1, wherein two pole sheets of the rotor enclosing an annular permanent magnet are mounted on a hub, the hub ends having axially upset portions by which the pole sheets are fixed on the hub and the hub is fixed on the rotor shaft.
Claim 12
Dependent Claim
33 words
A motor according to claim 1, wherein the short-circuiting discs are slightly uneven, for instance corrugated, thereby anchoring the exciting coil and the short-circuiting discs by elastic clamping forces between the stator sheets.
References Cited (Backward Citations)
US2256711A
Cited
US2432070A
Cited
US2981855A
Cited
US2951957A
Cited
US3428841A
Cited
US3427485A
Cited
US3448306A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |