Patent US4823034A successfully refreshed from Google Patents.
US4823034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brushless DC motor with tolerance compensation spring
Assignee: Papst Licensing GmbH and Co KG
•
Filing: 1987-10-27
•
Granted: 1989-04-18
•
Expires: 2007-10-27
Abstract
Abstract Prior art stators of brushless DC motors are securely connected with the bearing support member, and/or with the fastening flange. The printed circuit board with electronic components for commutation is arranged for space reasons between the fastening flange and the stator. This type of construction makes difficult impossible an exchange of defective components. A removable stator is proposed which is retained and secured by means of only a spring element that compensates for tolerance variations in replacement parts.
Inventors
- 👤 Gunter Wrobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:46
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/18; H02K1/187; H02K29/00; H02K29/06
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
50 words
An electric motor comprising outside rotor means, stator means, and bearing support means operatively connected with a fastening flange, the stator means being mounted with a sliding seat on the outer surface of the bearing support means, and a spring means for securing the stator means axially and against rotation.
Claim 2
Dependent Claim
50 words
An electric motor comprising outside rotor means, stator means, and bearing support means operatively connected with a fastening flange, the stator means being mounted with a sliding seat on the outer surface of the bearing support means, and a spring means for securing the stator means axially and against rotation.
Claim 3
Dependent Claim
16 words
An electric motor according to claim 1, wherein said electric motor is a brushless d.c. motor.
Claim 4
Dependent Claim
16 words
An electric motor according to claim 1, wherein said outside rotor means has a bell-shaped configuration.
Claim 5
Dependent Claim
39 words
An electric motor according to claim 1, wherein the stator means is secured axially by means of the spring means acting springingly in an abutting manner and secured against rotation by the spring means acting in a locking manner.
Claim 6
Dependent Claim
47 words
An electric motor according to claim 4, wherein the spring means is a coil spring whose end windings have different diameters, one end winding being disposed essentially at a right angle to the axis of the coil and the other end winding including an end axially extending.
Claim 7
Dependent Claim
47 words
An electric motor according to claim 5, wherein said bearing support means is a tubular bearing member the outer surface of the tubular bearing member being provided at one end with a circumferential groove and at an opposite end thereof having the flange and an abutment surface.
Claim 8
Dependent Claim
32 words
An electric motor according to claim 6, wherein the outer surface of the tubular bearing member includes an axially extending groove in the axial end area that is disposed opposite the flange.
Claim 9
Dependent Claim
42 words
An electric motor according to claim 7, wherein the stator includes a stator lamellae package and wherein the axially extending groove commences at the one end of the tubular bearing and extends coaxially toward the stator lamellae package of the stator means.
Claim 10
Dependent Claim
50 words
An electric motor according to claim 8, wherein an inner bore wall of the stator lamellae package includes a coaxial aperture extending in an axial direction and wherein the length and width of the aperture is greater than the length and width of the axially extending end of the spring.
Claim 11
Dependent Claim
44 words
An electric motor according to claim 9, wherein the electric motor is a coaxial driving motor for a fan and wherein the fastening flange acts as an outer fan housing flange and wherein the fastening flange is a flange on the tubular bearing member.
Claim 12
Dependent Claim
27 words
An electric motor according to claim 10, wherein the one end of the winding has an inner diameter which is equal to or smaller than the groove.
Claim 13
Dependent Claim
16 words
An electric motor according to claim 10, wherein the one end of the winding is flat.
Claim 14
Dependent Claim
47 words
An electric motor according to claim 1, wherein the spring means is a coil spring whose end windings have differing diameters, one end winding being disposed essentially at a right angle to the axis of the coil and the other end winding including an axially extending end.
Claim 15
Dependent Claim
47 words
An electric motor according to claim 1, wherein said bearing support means is a tubular bearing member, the outer surface of the tubular bearing member being provided at one end with a circumferential groove and at an opposite end thereof having the flange and an abutment surface.
Claim 16
Dependent Claim
17 words
An electric motor according to claim 14, wherein said flange is a portion of said tubular member.
Claim 17
Dependent Claim
32 words
An electric motor according to claim 14, wherein the outer surface of the tubular bearing member includes an axially extending groove in the axial end area that is disposed opposite the flange.
Claim 18
Dependent Claim
42 words
An electric motor according to claim 7, wherein the stator includes a stator lamellae package and wherein axially extending groove commences at the one end of the tubular bearing and extends coaxially up to the stator lamellae package of the stator means.
Claim 19
Dependent Claim
50 words
An electric motor according to claim 9, wherein an inner bore wall of the stator lamellae package includes a coaxial aperture extending in an axial direction and wherein the length and width of the aperture is greater than the length and width of the axially extending end of the spring.
Claim 20
Dependent Claim
44 words
An electric motor according to claim 9, wherein the electric motor is a coaxial driving motor for a fan and wherein the fastening flange acts as an outer fan housing flange and wherein the fastening flange is a flange on the tubular bearing member.
Claim 21
Dependent Claim
27 words
An electric motor according to claim 13, wherein the one end of the winding has an inner diameter which is equal to or smaller than the groove.
Claim 22
Dependent Claim
16 words
An electric motor according to claim 20, wherein the one end of the winding is flat.
Claim 23
Dependent Claim
27 words
An electric motor according to claim 1, wherein the spring means is operable to produce an axial force between the stator means and the bearing support means.
Claim 24
Dependent Claim
49 words
An electric motor according to claim 22, wherein said spring means is constituted by a substantially flat spring having at least one first portion which serves for engagement with one of the stator means and at least one second portion which serves for engagement with the bearing support means.
Claim 25
Dependent Claim
19 words
An electric motor according to claim 23, wherein at least one of said engagements is a circumferential snap-in engagement.
Claim 26
Dependent Claim
31 words
An electric motor according to claim 23, wherein said flat spring is a lengthy sheet-type spring and said first and second portions each being an end area of said lengthy spring.
Claim 27
Dependent Claim
31 words
An electric motor according to claim 1, wherein said flange extends at a substantially right angle to said bearing support means and wherein said bearing support means is of tubular shape.
References Cited (Backward Citations)
US3443135A
Cited
US4613778A
Cited
US4612468A
Cited
US4607182A
Cited
US4703209A
Cited
US4655616A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |