US3860093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elevator driving system
Assignee: Hitachi Ltd
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Filing: 1973-05-29
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Granted: 1975-01-14
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Expires: 1993-05-29
Abstract
Abstract An elevator driving system comprising a three-phase induction motor including three-phase armature windings having a plurality of terminals and arranged for change-over between the double star connection mode and the delta connection mode, means for connecting said armature windings in the double star connection mode to a three-phase a.c. power supply when the elevator is driven for service operation, means for connecting said armature windings in the delta connection mode to the three-phase a.c. power supply when the elevator car is driven for maintenance operation, means for changing over the connection mode of said armature windings to the delta connection during application of the brake, and a controlled rectifier circuit for applying a d.c. voltage across selected two terminals among said terminals during the same braking period.
Inventors
- 👤 Nobuo Mitsui
- 👤 Tadao Kameyama
- 👤 Akinori Watanabe
- 👤 Isao Fukushima
- 👤 Takanobu Hatakeyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:36
CPC Classifications
H; H02; H02P; H02P27/00; H02P27/02; H02P27/026; B; B66; B66B; B66B1/00; B66B1/24; B66B1/28
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
103 words
An elevator driving system comprising: a three-phase induction motor including delta-connected armature windings and having apex terminals (U1, V1, W1) of the deltaconnection and intermediate terminals (U2, V2, W2) of the respective phase windings; means for connecting said apex terminals to one another and for simultaneously connecting said intermediate terminals to a three-phase a.c. power supply for driving the elevator at a high speed; and means for disconnecting the mutual connection of said apex terminal and for simultaneously applying a d.c. voltage across two terminals arbitrarily selected from at least one of said apex terminals and said intermediate terminals for braking the elevator.
Claim 2
Dependent Claim
103 words
An elevator driving system comprising: a three-phase induction motor including delta-connected armature windings and having apex terminals (U1, V1, W1) of the deltaconnection and intermediate terminals (U2, V2, W2) of the respective phase windings; means for connecting said apex terminals to one another and for simultaneously connecting said intermediate terminals to a three-phase a.c. power supply for driving the elevator at a high speed; and means for disconnecting the mutual connection of said apex terminal and for simultaneously applying a d.c. voltage across two terminals arbitrarily selected from at least one of said apex terminals and said intermediate terminals for braking the elevator.
Claim 3
Dependent Claim
36 words
An elevator driving system as claimed in claim 1 wherein said d.c. voltage applying means comprises an a.c. power supply and a controlled rectifier circuit connected to said power supply and including a plurality of thyristors.
Claim 4
Dependent Claim
27 words
An elevator driving system as claimed in claim 2, wherein said controlled rectifier circuit includes a route which can continuously supply direct current in the forward direction.
Claim 5
Dependent Claim
63 words
An elevator driving system as claimed in claim 2, further comprising means for generating a speed instruction signal during application of the brake, means for detecting the rotating speed of said induction motor, means for comparing said speed instruction signal with the detected speed of said induction motor, and means for controlling said thyristors in response to the output of said comparing means.
Claim 6
Dependent Claim
39 words
An elevator driving system as claimed in claim 4, wherein means for detecting the physical position of the elevator car is further provided, and said speed instruction signal generating means responds to the output of said position detecting means.
Claim 7
Dependent Claim
36 words
An elevator driving system according to claim 1, wherein said means for disconnecting and for applying a d.c. voltage applies the d.c. voltage across two terminals arbitrarily selected from said apex terminals for braking the elevator.
Claim 8
Dependent Claim
36 words
An elevator driving system according to claim 1, wherein said means for disconnecting and for applying a d.c. voltage applies the d.c. voltage across two terminals arbitrarily selected from said intermediate terminals for braking the elevator.
Claim 9
Dependent Claim
46 words
An elevator driving system according to claim 1, wherein said means for disconnecting and for applying a d.c. voltage applies the d.c. voltage between an arbitrarily selected apex terminal and an intermediate terminal of the phase winding opposite the selected apex terminal for braking the elevator.
Claim 10
Dependent Claim
30 words
An elevator driving system according to claim 1, further comprising means for connecting said apex terminals to a three-phase a.c. power supply for driving the elevator at a high speed.
Claim 11
Dependent Claim
127 words
In an elevator driving system in which the elevator is driven by a three-phase induction motor at different speeds, and a control system is provided for the motor, the improvement comprising the three-phase induction motor having delta-connected armature windings, apex terminals for the delta-cconnection and intermediate terminals for the respective phase windings, the control system for the motor including means for connecting said apex terminals to one another and for simultaneously connecting said intermediate terminals to a three-phase a.c. power supply for drIving the elevator at a high speed, and means for disconnecting the mutual connection of said apex terminals and for simultaneously applying a d.c. voltage across two terminals selected from at least one of said apex terminals and said intermediate terminals for braking the elevator.
Claim 12
Dependent Claim
127 words
In an elevator driving system in which the elevator is driven by a three-phase induction motor at different speeds, and a control system is provided for the motor, the improvement comprising the three-phase induction motor having delta-connected armature windings, apex terminals for the delta-cconnection and intermediate terminals for the respective phase windings, the control system for the motor including means for connecting said apex terminals to one another and for simultaneously connecting said intermediate terminals to a three-phase a.c. power supply for drIving the elevator at a high speed, and means for disconnecting the mutual connection of said apex terminals and for simultaneously applying a d.c. voltage across two terminals selected from at least one of said apex terminals and said intermediate terminals for braking the elevator.
Claim 13
Dependent Claim
34 words
In an elevator driving system according to claim 10, the control system further including means for connecting said apex terminals to a three-phase a.c. power supply for driving the elevator at a low speed.
Claim 14
Independent Claim
101 words
A method for driving an elevator in which a three-phase induction motor having delta-connected armature windings, apex terminals of the delta-connection and intermediate terminals of the respective phase windings is provided, the method comprising the steps of connecting the apex terminals to one another and simultaneously connecting the intermediate terminals to a three-phase a.c. power supply for driving the elevator at a high speed, and disconnecting the mutual connection of the apex terminals and simultaneously applying a d.c. voltage across two terminals selected from at least one of the apex terminals and the intermediate terminals for braking operation of the elevator.
Claim 15
Independent Claim
101 words
A method for driving an elevator in which a three-phase induction motor having delta-connected armature windings, apex terminals of the delta-connection and intermediate terminals of the respective phase windings is provided, the method comprising the steps of connecting the apex terminals to one another and simultaneously connecting the intermediate terminals to a three-phase a.c. power supply for driving the elevator at a high speed, and disconnecting the mutual connection of the apex terminals and simultaneously applying a d.c. voltage across two terminals selected from at least one of the apex terminals and the intermediate terminals for braking operation of the elevator.
Claim 16
Dependent Claim
34 words
A method according to claim 12, wherein the step of disconnecting and applying a d.c. voltage includes applying the voltage across two terminals selected from the apex terminals or braking operation of the elevator.
Claim 17
Dependent Claim
34 words
A method according to claim 12, wherein the step of disconnecting and applying a d.c. voltage includes applying the voltage across two terminals selected from the intermediate terminals for braking operation of the elevator.
Claim 18
Dependent Claim
46 words
A method according to claim 12, wherein the step of disconnecting and applying a d.c. voltage includes applying the voltage between an arbitrarily selected apex terminal and an intermediate terminal of the phase winding opposite to the selected apex terminal for braking operation of the elevator.
Claim 19
Dependent Claim
37 words
A method according to claim 12, wherein the step of disconnecting and applying a d.c. voltage includes applying the voltage via a controlled rectifier circuit having a plurality of thyristors and connected an an a.c. power supply.
Claim 20
Dependent Claim
55 words
A method according to claim 16, further comprising the steps of generating a speed instruction signal during braking operation of the elevator, detecting the rotating speed of the induction motor, comparing the speed instruction signal with the detected speed of the induction motor, and controlling the thyristors in response to the result of the comparison.
Claim 21
Dependent Claim
38 words
A method according to claim 17, further comprising the steps of detecting the physical position of the elevator car and controlling the generation of the speed instruction signal in accordance with the detected position of the elevator car.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |