Patent US5637526A successfully refreshed from Google Patents.
Patent US4803390A successfully refreshed from Google Patents.
US4803390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual motor drive arrangement for a small domestic appliance
Assignee: US Philips Corp
•
Filing: 1987-11-19
•
Granted: 1989-02-07
•
Expires: 2007-11-19
Abstract
Abstract Two drive motors (251) drive the shaft of a load via a common drive wheel (19), either directly or via further gear wheels. The rotor shafts of the drive motors are constructed as two-pole single-phase synchronous motors having permanent-magnet rotors. The gear wheels mounted on the rotor shafts are oriented in such a way relative to the direction of magnetic polarization of the rotor magnets that when the arrangement is assembled and in mesh, the magnetic orientation of both rotors (27) relative to the main direction of the stator fields is the same for a positive stator current.
Inventors
- 👤 Leo Bertram
- 👤 Hugo Schemmann
- 👤 Romuald L. Bukoschek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:20
CPC Classifications
A; A47; A47J; A47J43/00; A47J43/04; A47J43/07; A47J43/08; H; H02; H02K; H02K16/00; H02K21/00; H02K21/12; H02K21/14; H02K21/18; H02K21/185; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19014
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
252 words
A drive arrangement for a small electrically driven appliance comprising a common drive gear wheel which is connected to a load, said drive gear wheel being characterized by a pitch angle ∝ 2 =πm/r 2 , where r 2 is the radius of the drive gear wheel and m is its module, a pair of two-pole single phase synchronous drive motors each having a stator with a stator field and a permanent magnet rotor mounted on a rotor shaft and having a direction of polarization, each motor having a gear wheel mounted on its rotor shaft and meshing with said common drive gear wheel, the angle θ between the main direction of the stator field and the rotor field being the same for all rotors for a positive stator current, whereby when the stator coils are not energized the rest position θ=θ o established by the magnetic detent torque is maintained and all the motors experience a torque in the same direction when voltage is applied, the lines connecting the rotor gear wheel axes to the common drive gear wheel axis enclosing an angle ∝ which is a multiple n' of the pitch angle ∝ 2 , the value of n' being derived from the relationship ##EQU15## where z 1 =the number of teeth of a rotor gear wheel, z 2 =the number of teeth of the common drive gear wheel, K=the whole depth of the teeth, and n' need not be an integer, all the length dimensions being expressed in mm.
Claim 2
Dependent Claim
252 words
A drive arrangement for a small electrically driven appliance comprising a common drive gear wheel which is connected to a load, said drive gear wheel being characterized by a pitch angle ∝ 2 =πm/r 2 , where r 2 is the radius of the drive gear wheel and m is its module, a pair of two-pole single phase synchronous drive motors each having a stator with a stator field and a permanent magnet rotor mounted on a rotor shaft and having a direction of polarization, each motor having a gear wheel mounted on its rotor shaft and meshing with said common drive gear wheel, the angle θ between the main direction of the stator field and the rotor field being the same for all rotors for a positive stator current, whereby when the stator coils are not energized the rest position θ=θ o established by the magnetic detent torque is maintained and all the motors experience a torque in the same direction when voltage is applied, the lines connecting the rotor gear wheel axes to the common drive gear wheel axis enclosing an angle ∝ which is a multiple n' of the pitch angle ∝ 2 , the value of n' being derived from the relationship ##EQU15## where z 1 =the number of teeth of a rotor gear wheel, z 2 =the number of teeth of the common drive gear wheel, K=the whole depth of the teeth, and n' need not be an integer, all the length dimensions being expressed in mm.
Claim 3
Dependent Claim
107 words
A drive arrangement as in claim 1 wherein each gear wheel (211/212, 351/352, 611/612) has the same tooth orientation relative to the respective direction of polarization (531/532) of the rotor magnets (271/272, 471/472, 671/672) in all the motors (251/252, 651/652) and the central stator axes (501/502, 601/602) are oriented in such a way that the direction of polarization (531/532) of all the rotors (271/272, 471/472, 671/672) relative to the main direction of the stator fields (541/542) in the case of a positive stator current is the same, and in that all the motors (251/252, 651/652) experience a torque in the same direction when the voltage is applied.
Claim 4
Dependent Claim
97 words
A drive arrangement as claimed in claim 2, characterized in that the arrangement is symmetrical about the bisector (52) of the angle α or is rotated relative to this position through an integral multiple k of the pitch angle α 1 and also comprises with α=nα.sub.1 u, and α=2kα.sub.1 +2ε, n being an integer, where u is the transmission ratio, k is an integral factor 0, 1, 2, . . . k, and ε is the angle between the central stator axes (501/502, 601/602) and the axes (511/512) parallel to the bisector (52) of the angle α.
Claim 5
Dependent Claim
27 words
A drive arrangement as claimed in claim 3, characterized in that the angle ε is zero and the transmission ratio u=2k/n, where k and n are integers.
Claim 6
Dependent Claim
140 words
A drive arrangement as claimed in claim 1, characterized in that the tooth orientation of one or all the gear wheels (211/212, 351/352, 611/612) relative to the axis of rotor magnetization (531/532) is rotated through an angle δ.sub.1,2 =α/2-ε-kα.sub.1 relative to the symmetrical normal position in which the gear wheels are identically mounted on the rotors (271/272, 471/472, 671/672) for α/2=kα.sub.1 +ε, and in that the associated central stator axes (501/502, 601/602) are also rotated in the same direction through the same angle α 1 ,2 where α 1 is the pitch angle of the motor gear wheel which complies with ##EQU16## K is an integral factor equal to 0, 1, 2, . . . k, and ε is the angle between the central stator axes (501/502, 601/602) and the axes (511/512) parallel to the bisector (52) of said angle.
Claim 7
Dependent Claim
25 words
A drive arrangement as claimed in claim 1, characterized in that the rotors (271/272, 471/472, 671/672) are provided with a marking identifying their polarization (531/532).
Claim 8
Dependent Claim
29 words
A drive arrangement as claimed in claim 1, characterized in that two motors (251/252, 651/652) constructed for 110 V operation are arranged in series for operation on 220 V.
Claim 9
Dependent Claim
77 words
A drive arrangement as claimed in claim 1, characterized in that the tooth orientations of the rotor gear wheels (211/212, 351/352, 611/612) relative to the direction of magnetization (531/532) of the rotors (271/272, 471/472, 671/672) are different in such a way that for the desired orientation of the central stator axes 501/502, 601/602) the requirements for the rotor gear wheels (211/212, 351/352, 611/612) to be in mesh with the drive gear wheel (19, 37, 619) are met.
Claim 10
Dependent Claim
88 words
A drive arrangement as claimed in claim 4, characterized in that it complies with the following dimensioning data: α=180°, β=90°, ε=0, δ=0, k=7, n=28, u=1:2, z 1 =28, z 2 =56, m=0.8, r 1 =11.2 mm r 2 =22.4 mm, where β is an angle between the lines (291/292, 691/692) connecting the axis (17, 38, 617) of the drive gear wheel (19, 37, 619) to the axes (231/232, 341/342, 631/632) of the rotor gear wheels (211/212, 351,352, 611/612), and δ is the residual angle, which follows from ##EQU17##
Claim 11
Dependent Claim
39 words
A drive arrangement as claimed in claim 4, characterized in that it complies with the following dimensioning data: α=60°, β=30°, ε=0, r 1 =2.4 mm, r 2 =19.2 mm, u=18, k=1, n=16, m=0.4, z 1 =12, z 2 =96.
Claim 12
Dependent Claim
21 words
A drive arrangement as claimed in claim 2, characterized in that it complies with the following dimensioning data: α=180°, β=135°, ε=-45°.
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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |