US4506766A — Method and apparatus for fault time operating of …

Claim 1

Independent Claim 289 words

A fault time operation device for an elevator motor (1) driven from an AC power source (8), said device comprising: (a) first means (4) for converting AC power from the source into DC power, said first means also being operable in a reverse mode to convert DC power into AC power, (b) second means (3) for converting DC power from the first converting means into AC power for the motor, (c) an emergency battery (11), (d) first switch means (7a) connected between an output of the power source and an input of the first converting means, (e) second switch means (7b) connected between the battery and a junction between an output of the first converting means and an input of the second converting means, (f) third switch means (15a) connected between an output of the second converting means and an input of the motor, (g) fourth switch means (15b) connected between the input of the first converting means and the input of the motor, (h) first means (CT) connected to the power source output for detecting a failure thereof, (i) second means (DCCT) connected to said junction for detecting a failure of the second converting means, and (j) control means (12) responsive to the first and second detecting means for: (1) opening the first and fourth switch means and closing the second and third switch means in resonse to a power source failure detection to energize the motor from the battery through the second converting means, and (3) opening the first and third switch means and closing the second and fourth switch means in response to a second converting means failure detection to energize the motor from the battery through the first converting means operating in a reverse mode.

Claim 2

Dependent Claim 289 words

A fault time operation device for an elevator motor (1) driven from an AC power source (8), said device comprising: (a) first means (4) for converting AC power from the source into DC power, said first means also being operable in a reverse mode to convert DC power into AC power, (b) second means (3) for converting DC power from the first converting means into AC power for the motor, (c) an emergency battery (11), (d) first switch means (7a) connected between an output of the power source and an input of the first converting means, (e) second switch means (7b) connected between the battery and a junction between an output of the first converting means and an input of the second converting means, (f) third switch means (15a) connected between an output of the second converting means and an input of the motor, (g) fourth switch means (15b) connected between the input of the first converting means and the input of the motor, (h) first means (CT) connected to the power source output for detecting a failure thereof, (i) second means (DCCT) connected to said junction for detecting a failure of the second converting means, and (j) control means (12) responsive to the first and second detecting means for: (1) opening the first and fourth switch means and closing the second and third switch means in resonse to a power source failure detection to energize the motor from the battery through the second converting means, and (3) opening the first and third switch means and closing the second and fourth switch means in response to a second converting means failure detection to energize the motor from the battery through the first converting means operating in a reverse mode.

Claim 3

Dependent Claim 74 words

A device as set forth in claim 1, wherein said first and second converting means are equally and symmetrically constructed, said first converting means functioning as an AC-DC converter and said second converting means functioning as a DC-AC inverter during normal operation of the motor in a driving mode, and said second converting means functioning as an AC-DC converter and said first converting means functioning as a DC-AC inverter during a power regenerating mode.

Claim 4

Dependent Claim 35 words

A device as set forth in claim 2, wherein said control means controls the operation modes of said first and second converting means in response to the output of said first and second detecting means.

Claim 5

Dependent Claim 30 words

A device as set forth in claim 1, wherein the first and third switch means are normally biased closed, and the second and fourth switch means are normally biased open.

Claim 6

Dependent Claim 30 words

A device as set forth in claim 3, wherein the first and third switch means are normally biased closed, and the second and fourth switch means are normally biased open.

Claim 7

Dependent Claim 18 words

A device as set forth in claim 4, wherein said first and second detecting means comprise current sensors.

Claim 8

Dependent Claim 18 words

A device as set forth in claim 5, wherein said first and second detecting means comprise current sensors.

Claim 9

Dependent Claim 145 words

In an elevator drive system including an elevator motor (1) driven from an AC power source (8), first means (4) for converting AC power from the source into DC power, said first means also being operable in a reverse mode to convert DC power into AC power, second means (3) for converting DC power from the first converting means into AC power for the motor, an emergency battery (11), means for detecting a failure of the power source, and means for detecting a failure of the second converting means, a method of fault operation comprising the steps of: (a) energizing the motor from the battery through the second converting means in response to a power source failure detection, and (b) energizing the motor from the battery through the first converting means operating in a reverse mode in response to a second converting means failure detection.

Claim 10

Dependent Claim 145 words

In an elevator drive system including an elevator motor (1) driven from an AC power source (8), first means (4) for converting AC power from the source into DC power, said first means also being operable in a reverse mode to convert DC power into AC power, second means (3) for converting DC power from the first converting means into AC power for the motor, an emergency battery (11), means for detecting a failure of the power source, and means for detecting a failure of the second converting means, a method of fault operation comprising the steps of: (a) energizing the motor from the battery through the second converting means in response to a power source failure detection, and (b) energizing the motor from the battery through the first converting means operating in a reverse mode in response to a second converting means failure detection.

Claim 11

Dependent Claim 66 words

A method as defined in claim 8, wherein step (b) comprises: (1) disconnecting the power source from the first converting means, (2) disconnecting the second converting means from the motor, (3) connecting the battery to a junction between an output of the first converting means and an input of the second converting means, and (4) connecting an input of the first converting means to the motor.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1988-03-25	1988-09-24	1989-03-26	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1992-03-25	1992-09-24	1993-03-26	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1996-03-25	1996-09-24	1997-03-26	$7700.00	Window Closed / Lapsed

Method and apparatus for fault time operating of an elevator _

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