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US4545464A
Expired / Lapsed
US
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Apparatus for controlling an A-C power elevator
Assignee: Mitsubishi Electric Corp
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Filing: 1983-03-01
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Granted: 1985-10-08
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Expires: 2003-03-01
Abstract
Abstract An apparatus for controlling an A-C powered elevator in which A-C electric power is converted into D-C electric power through a rectifier, the D-C electric power thus converted is converted into a A-C electric power of a variable frequency via an inverter, an A-C electric motor is driven by the thus converted A-C electric power, the A-C motor being controlled by a controller which is connected to a D-C control source, a cage is driven by the thus controlled electric motor, said motor producing regenerated electric power depending upon the operation condition of said cage, wherein provision is made of a regenerated electric power controlling device which is connected between the D-C side of the inverter and the controller in order to supply the regenerated electric power to the controller. When the voltage on the D-C side of the inverter becomes greater than a predetermined reference value, a switching element is rendered conductive, and the regenerated electric power is supplied to the controller. Therefore, a power regenerating inverter need not be independently provided, and the apparatus can be cheaply constructed. Further, since the electric power is not wastefully consumed, energy can be saved.
Inventors
- 👤 Masami Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:53
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/24; B66B1/28; B66B1/30; H; H02; H02M; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/453; H02M5/458; H02P; H02P23/00; H02P23/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
An apparatus for controlling an A-C powered elevator comprising a rectifier for converting A-C electric power to D-C electric power, an inverter connected to the rectifier for converting the D-C electric power to A-C electric power of a variable frequency, a cage, an A-C electric motor operatively associated with the cage and connected to the inverter to be driven by the variable frequency A-C electric power, the motor producing regenerated electric power depending on the operation conditions of the cage, means for controlling the A-C electric motor, a D-C source connected to the motor controlling means, and a regenerated electric power controlling device connected between the D-C side of the inverter and the motor controlling means in order to supply the regenerated electric power to the motor controlling means.
Claim 2
Independent Claim
129 words
An apparatus for controlling an A-C powered elevator comprising a rectifier for converting A-C electric power to D-C electric power, an inverter connected to the rectifier for converting the D-C electric power to A-C electric power of a variable frequency, a cage, an A-C electric motor operatively associated with the cage and connected to the inverter to be driven by the variable frequency A-C electric power, the motor producing regenerated electric power depending on the operation conditions of the cage, means for controlling the A-C electric motor, a D-C source connected to the motor controlling means, and a regenerated electric power controlling device connected between the D-C side of the inverter and the motor controlling means in order to supply the regenerated electric power to the motor controlling means.
Claim 3
Dependent Claim
82 words
The apparatus of claim 1 wherein the regenerated electric power controlling device includes a power controller which produces a switching signal when the voltage on the D-C side of the inverter exceeds a reference value and a switching element which is connected between the D-C side of the inverter and the motor controlling means, is further connected to the power controller, and is rendered conductive by the switching signal in order to supply the regenerated electric power to the motor controlling means.
Claim 4
Dependent Claim
23 words
The apparatus of claim 2 wherein the regenerated electric power controlling device further includes a diode connected in parallel with the switching element.
Claim 5
Dependent Claim
24 words
The apparatus of claim 3 wherein the regenerated electric power controlling device further includes a resistor connected between the switching element and the inverter.
Claim 6
Dependent Claim
85 words
The apparatus of claim 1 wherein the regenerated electric power controlling device includes a power controller which produces a switching signal when the voltage of the D-C source exceeds a reference value, a resistor connected to the D-C side of the inverter, and a switching element which is connected via the resistor to the D-C side of the inverter, is further connected to the power controller, and is rendered conductive by the switching signal so that the regenerated electric power is consumed by the resistor.
Claim 7
Dependent Claim
153 words
The apparatus of claim 1 wherein the regenerated electric power controlling device includes a power controller which produces a first signal when the voltage on the D-C side of the inverter exceeds a first reference value and produces a second signal when the voltage of the D-C source exceeds a second reference value, a first switching element which is connected between the D-C side of the inverter and the motor controlling means, is further connected to the power controller, and is rendered conductive by the first signal in order to supply the regenerated electric power to the motor controlling means, a resistor, and a second switching element which is connected in series with the resistor to the D-C side of the inverter via the first switching element, is further connected to the power controller, and is rendered conductive by the second signal so that the regenerated electric power is consumed by the resistor.
Claim 8
Dependent Claim
44 words
The apparatus of claim 6 wherein the regenerated electric power controlling device further includes a resistor connected between the first switching element and the inverter and wherein the first and second switching elements and the motor controlling means are connected at a common point.
Claim 9
Dependent Claim
91 words
The apparatus of claim 6 wherein the inverter includes a plurality of arms connected in parallel with each other, each arm comprising a set of switching elements connected in series and diodes connected in parallel with each switching element, wherein the first and second switching elements are connected in series at a common point, and wherein diodes are connected in parallel with each of the first and second switching elements whereby the first and second switching elements and their associated diodes constitute another arm similar to the arms of the inverter.
Claim 10
Dependent Claim
154 words
The apparatus of claim 1 wherein the regenerated electric power controlling device includes a power controller which produces a first signal when the voltage on the D-C side of the inverter exceeds a first reference value and produces a second signal when the voltage of the D-C source exceeds a second reference value, a first switching element which is connected between the D-C side of the inverter and the motor controlling means, is further connected to the power controller, and is rendered conductive by the first signal so that the regenerated electric power is supplied to the motor controlling means, a resistor connected to the D-C side of the inverter, and a second switching element which is connected to the D-C side of the inverter via the resistor, is further connected to the power controller, and is rendered conductive by the second signal so that the regenerated electric power is consumed by the resistor.
Claim 11
Independent Claim
179 words
An apparatus for controlling an A-C powered elevator comprising a rectifier for converting A-C electric power to D-C electric power, a capacitor connected to the rectifier for smoothing the D-C electric power, an inverter connected to the capacitor for inverting the smoothed D-C electric power to A-C electric power of a variable frequency, a cage, an A-C electric motor operatively associated with the cage and connected to the inverter to be driven by the variable frequency A-C electric power, the motor producing regenerated electric power depending on the operating conditions of the cage, means for controlling the A-C electric motor, a D-C source connected to the motor controlling means, a power controller which produces a switching signal when the A-C power is interrupted, a resistor connected to the D-C side of the inverter, and a switching element which is connected via the resistor to the D-C side of the inverter, is further connected to the power controller, and is rendered conductive by the switching signal so that the electric charge stored in the capacitor is consumed by the resistor.
Claim 12
Independent Claim
179 words
An apparatus for controlling an A-C powered elevator comprising a rectifier for converting A-C electric power to D-C electric power, a capacitor connected to the rectifier for smoothing the D-C electric power, an inverter connected to the capacitor for inverting the smoothed D-C electric power to A-C electric power of a variable frequency, a cage, an A-C electric motor operatively associated with the cage and connected to the inverter to be driven by the variable frequency A-C electric power, the motor producing regenerated electric power depending on the operating conditions of the cage, means for controlling the A-C electric motor, a D-C source connected to the motor controlling means, a power controller which produces a switching signal when the A-C power is interrupted, a resistor connected to the D-C side of the inverter, and a switching element which is connected via the resistor to the D-C side of the inverter, is further connected to the power controller, and is rendered conductive by the switching signal so that the electric charge stored in the capacitor is consumed by the resistor.
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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) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |