US3634873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hermetically sealed dc-motor-compressor unit
Assignee: Sanyo Electric Co Ltd
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Filing: 1970-06-11
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Granted: 1972-01-11
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Expires: 1990-06-11
Abstract
Abstract A hermetically sealed DC motor-compressor unit comprises a compressor component, a DC motor component including a permanent magnet rotor and a stator, said stator having a plurality of phase-windings and transistor-switching elements for energizing the respective phase windings, reed switch means for controlling said transistor-switching elements, and a hermetically sealed casing enclosing therein the compressor component, the DC motor component and the reed switch means. Any time differences which may caused due to the deflection of the magnetic flux for operating the reed switches and due to the delay of the switching operation of the reed switches per se are compensated by adjusting the length of the shielding member and by adjusting the relative location between the reed switches and their respective magnets, respectively.
Inventors
- 👤 Satoshi Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:03
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K25/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
122 words
A hermetically sealed DC motor-compressor unit comprising a compressor component; a DC motor component including a permanent magnet rotor and a stator, said stator having a plurality of phase windings and transistor-switching elements for energizing the respective phase windings; switching means for controlling said transistor-switching elements, said switching means comprising at least one combination of a magnetically operated reed switch with a cooperating magnet for operating said reed switch and at least one movable shielding member for periodically shielding said reed switch from its cooperating magnet; a first hermetically sealed casing enclosing therein said compressor component, said DC motor component and said switching means, and a further hermetically sealed casing for each said reed switch located within said first hermetically sealed casing.
Claim 2
Dependent Claim
122 words
A hermetically sealed DC motor-compressor unit comprising a compressor component; a DC motor component including a permanent magnet rotor and a stator, said stator having a plurality of phase windings and transistor-switching elements for energizing the respective phase windings; switching means for controlling said transistor-switching elements, said switching means comprising at least one combination of a magnetically operated reed switch with a cooperating magnet for operating said reed switch and at least one movable shielding member for periodically shielding said reed switch from its cooperating magnet; a first hermetically sealed casing enclosing therein said compressor component, said DC motor component and said switching means, and a further hermetically sealed casing for each said reed switch located within said first hermetically sealed casing.
Claim 3
Dependent Claim
40 words
A hermetically sealed DC motor-compressor unit as defined in claim 1 in which said combination of a magnetically operated reed switch with a cooperating magnet is secured to said stator while said movable shielding member is mounted on said rotor.
Claim 4
Dependent Claim
58 words
A hermetically sealed DC motor-compressor unit as defined in claim 1 in which the length of said shielding member in the direction of movement thereof is so dimensioned as to compensate for time differences at the beginning and at the end of the shielding operation which are caused by deflection of the magnetic flux toward said shielding member.
Claim 5
Dependent Claim
43 words
A hermetically sealed DC motor-compressor unit as defined in claim 1 in which said reed switch is located in such a relative position with respect to its corresponding magnet that the time lag of switching operation of said reed switch is compensated for.
Claim 6
Dependent Claim
89 words
A hermetically sealed DC motor-compressor unit as defined in claim 1 in which the length of said shielding member in the direction of the movement thereof is sO dimensioned as to compensate for time differences at the beginning and at the end of the shielding operation which are caused by deflection of the magnetic flux toward said shielding member, and said reed switch is located in such relative position with respect to its corresponding magnets that the time lag of switch operation of said reed switch is compensated for.
Claim 7
Dependent Claim
57 words
A hermetically sealed DC motor-compressor unit as defined in claim 2 in which said shielding member includes a shielding disk secured to the shaft of the rotor for shielding the leakage magnetic flux from the permanent magnet of the rotor and said shielding member of said switching means is formed as an extension of said shielding disk.
Claim 8
Dependent Claim
39 words
A hermetically sealed DC motor-compressor unit as defined in claim 6 in which the permanent magnet rotor is fixed to the rotor shaft via a soft metal sleeve and said shielding disk is mounted on said soft metal sleeve.
Claim 9
Dependent Claim
35 words
A hermetically sealed DC motor-compressor unit as defined in claim 6 in which a pair of arc-shaped shielding plates are formed symmetrically at the opposite edges of said shielding disk to form said shielding member.
Claim 10
Dependent Claim
28 words
A hermetically sealed DC motor-compressor unit as defined in claim 6 in which the permanent magnet rotor is fixed to the rotor shaft by a soft metal sleeve.
Claim 11
Dependent Claim
114 words
A hermetically sealed DC motor-compressor unit comprising a compressor component; a DC motor component including a permanent magnet rotor and a stator, said stator having a plurality of phase windings and transistor-switching elements for energizing the respective phase windings; switching means for controlling said transistor-switching elements, said switching means comprising a plurality of magnetically operated reed switches which are respectively connected to said transistor-switching elements, a plurality of cooperating magnets for operating the respective reed switches and at least one movable shielding member for periodically and successively shielding said reed switches from their respective cooperating magnets; and a hermetically sealed casing enclosing therein said compressor component, said DC motor component and said switching means.
Claim 12
Dependent Claim
114 words
A hermetically sealed DC motor-compressor unit comprising a compressor component; a DC motor component including a permanent magnet rotor and a stator, said stator having a plurality of phase windings and transistor-switching elements for energizing the respective phase windings; switching means for controlling said transistor-switching elements, said switching means comprising a plurality of magnetically operated reed switches which are respectively connected to said transistor-switching elements, a plurality of cooperating magnets for operating the respective reed switches and at least one movable shielding member for periodically and successively shielding said reed switches from their respective cooperating magnets; and a hermetically sealed casing enclosing therein said compressor component, said DC motor component and said switching means.
Claim 13
Dependent Claim
51 words
A hermetically sealed DC motor-compressor unit as defined in claim 10 in which said reed switches and said cooperating magnets are arranged on a stationary member secured to said stator of said DC motor component while said shielding member is mounted to move with the rotor of said DC motor component.
Claim 14
Dependent Claim
72 words
A hermetically sealed DC motor-compressor unit as defined in claim 11 in which said reed switches and their corresponding magnets are circularly arranged with the same angular interval between two adjacent reed switches and their corresponding magnets, and said shielding member is continuously movable with said rotor at the space between said reed switches and their corresponding magnets so as to successively shield and unshield said reed switches from their respective magnets.
Claim 15
Dependent Claim
23 words
A hermetically sealed DC motor-compressor unit as defined in claim 10 further comprising additional means for hermetically sealing each of said reed switches.
References Cited (Backward Citations)
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US3096467A
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US3111090A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |