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公开(公告)号：US20180016114A1
公开(公告)日：2018-01-18
申请号：US15718822
申请日：2017-09-28
Applicant: Otis Elevator Company
Inventor： Prasanna Nagarajan , Amir Lotfi , Edward Piedra
IPC: B66B1/28
CPC classification number: B66B1/28 , B66B5/027 , B66B2201/00
Abstract: According to one embodiment, a method of operating an elevator system is provided. The method includes detecting, using a controller, when an external power source is unavailable. The method also includes controlling, using the controller, a plurality of components of the elevator system. The controlling comprises operating at least one of an elevator car, a drive unit, an inverter and a brake. The method further includes detecting, using the controller, an original direction of travel of the elevator car. The method yet further includes detecting, using the controller, a mode of the elevator car, wherein the mode includes at least one of a motoring mode, a near balance mode, and a regenerative mode. The method includes determining, using the controller, a target floor. The method also includes adjusting, using the controller, a velocity of the elevator car to reach the target floor in response to the mode detected.
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公开(公告)号：US09809418B2
公开(公告)日：2017-11-07
申请号：US15056158
申请日：2016-02-29
Applicant: Otis Elevator Company
Inventor： Prasanna Nagarajan , Amir Lotfi , Edward Piedra
CPC classification number: B66B1/28 , B66B5/027 , B66B2201/00
Abstract: According to one embodiment, a method of operating an elevator system is provided. The method includes detecting, using a controller, when an external power source is unavailable. The method also includes controlling, using the controller, a plurality of components of the elevator system. The controlling comprises operating at least one of an elevator car, a drive unit, an inverter and a brake. The method further includes detecting, using the controller, an original direction of travel of the elevator car. The method yet further includes detecting, using the controller, a mode of the elevator car, wherein the mode includes at least one of a motoring mode, a near balance mode, and a regenerative mode. The method includes determining, using the controller, a target floor. The method also includes adjusting, using the controller, a velocity of the elevator car to reach the target floor in response to the mode detected.
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公开(公告)号：US20170247222A1
公开(公告)日：2017-08-31
申请号：US15056158
申请日：2016-02-29
Applicant: Otis Elevator Company
Inventor： Prasanna Nagarajan , Amir Lotfi , Edward Piedra
IPC: B66B1/28
CPC classification number: B66B1/28 , B66B5/027 , B66B2201/00
Abstract: According to one embodiment, a method of operating an elevator system is provided. The method includes detecting, using a controller, when an external power source is unavailable. The method also includes controlling, using the controller, a plurality of components of the elevator system. The controlling comprises operating at least one of an elevator car, a drive unit, an inverter and a brake. The method further includes detecting, using the controller, an original direction of travel of the elevator car. The method yet further includes detecting, using the controller, a mode of the elevator car, wherein the mode includes at least one of a motoring mode, a near balance mode, and a regenerative mode. The method includes determining, using the controller, a target floor. The method also includes adjusting, using the controller, a velocity of the elevator car to reach the target floor in response to the mode detected.
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公开(公告)号：US20220204315A1
公开(公告)日：2022-06-30
申请号：US17133897
申请日：2020-12-24
Applicant: Otis Elevator Company
Inventor： Prasanna Nagarajan , Shantanu Godbole
Abstract: Disclosed is a monitoring system for a people mover system, having: a controller for controlling an electronic component of the people mover system, wherein the controller is configured to: determine a first operational status of the component, while the component is operating with first operational parameters; and transmit first controller data to a BOT service, directly or via a mobile device, wherein the first controller data is indicative of the first operational status.
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公开(公告)号：US11296623B2
公开(公告)日：2022-04-05
申请号：US16862961
申请日：2020-04-30
Applicant: Otis Elevator Company
Inventor： Prasanna Nagarajan , Shashank Krishnamurthy , Konda Reddy Chevva
Abstract: A system includes a converter operatively connected to an alternating current (AC) power source and a direct current (DC) bus, an inverter operatively connected to a motor and the DC bus, and a controller. The converter includes a first plurality of switching devices in selective communication with each phase of the AC power source and the DC bus. The inverter includes a second plurality of switching devices in selective communication with each phase of a plurality of phases of the motor and the DC bus. The controller is operable to command dropping of a brake through a passive delay circuit responsive to detection of an emergency stop condition for a load driven by the motor and reduce a voltage on the DC bus by dropping at least one phase of the AC power source and/or using a dynamic braking resistor prior to the brake physically dropping.
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Patent Agency Ranking
公开(公告)号：US20210371242A1
公开(公告)日：2021-12-02
申请号：US17098025
申请日：2020-11-13
Applicant: Otis Elevator Company
Inventor： Uwe Schönauer , Prasanna Nagarajan
Abstract: An elevator system (2, 102) includes a drive system (10) including one or more drive components (11, 13) and drive hardware (15) for controlling the supply of power to the one or more drive components (11,13), a safety chain (16) arranged to break and thus interrupt a supply of power to the one or more drive components (11, 13) unless all of one or more safety condition(s) is satisfied; and a control device (12). The control device (12) is arranged to receive drive information from the drive hardware (15) indicative of a drive system fault; to receive safety chain information from the safety chain (16) indicative of a safety chain break; and to detect and classify a fault in the elevator system (2, 102) using the drive information and the safety chain information.
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公开(公告)号：US20200259430A1
公开(公告)日：2020-08-13
申请号：US16862961
申请日：2020-04-30
Applicant: Otis Elevator Company
Inventor： Prasanna Nagarajan , Shashank Krishnamurthy , Konda Reddy Chevva
Abstract: A system includes a converter operatively connected to an alternating current (AC) power source and a direct current (DC) bus, an inverter operatively connected to a motor and the DC bus, and a controller. The converter includes a first plurality of switching devices in selective communication with each phase of the AC power source and the DC bus. The inverter includes a second plurality of switching devices in selective communication with each phase of a plurality of phases of the motor and the DC bus. The controller is operable to command dropping of a brake through a passive delay circuit responsive to detection of an emergency stop condition for a load driven by the motor and reduce a voltage on the DC bus by dropping at least one phase of the AC power source and/or using a dynamic braking resistor prior to the brake physically dropping.
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公开(公告)号：US10680538B2
公开(公告)日：2020-06-09
申请号：US15718607
申请日：2017-09-28
Applicant: Otis Elevator Company
Inventor： Prasanna Nagarajan , Shashank Krishnamurthy , Konda Reddy Chevva
Abstract: A system includes a converter operatively connected to an alternating current (AC) power source and a direct current (DC) bus, an inverter operatively connected to a motor and the DC bus, and a controller. The converter includes a first plurality of switching devices in selective communication with each phase of the AC power source and the DC bus. The inverter includes a second plurality of switching devices in selective communication with each phase of the motor and the DC bus. The controller is operable to command dropping of a brake through a passive delay circuit responsive to an emergency stop condition for a load driven by the motor and reduce a voltage on the DC bus by dropping at least one phase of the AC power source and/or using a dynamic braking resistor prior to the brake physically dropping.
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公开(公告)号：US10287131B2
公开(公告)日：2019-05-14
申请号：US15613615
申请日：2017-06-05
Applicant: OTIS ELEVATOR COMPANY
Inventor： Prasanna Nagarajan , Ismail Agirman
IPC: B66B5/00 , F24F11/30 , G05D22/02 , F24F110/20 , F24F110/10
Abstract: An illustrative example method of maintaining an elevator drive includes determining whether a humidity condition near the elevator drive is outside a desired range. When the humidity condition is outside the desired range and the elevator drive is idle, reactive power is provided to at least one component of the elevator drive to increase a temperature of the at least one component without using the elevator drive to operate an associated elevator system.
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公开(公告)号：US20160311644A1
公开(公告)日：2016-10-27
申请号：US15103502
申请日：2013-12-18
Applicant: OTIS ELEVATOR COMPANY
Inventor： Ismail Agirman , Shashank Krishnamurthy , Prasanna Nagarajan , Hanjong Kim , Yang Wang
Abstract: A method (70) for controlling a multilevel regenerative drive (30) having a converter (32) and an inverter (34) is disclosed. The method (70) may include applying at least one of unipolar modulation and bipolar modulation to the converter (32), and applying at least one of unipolar modulation and bipolar modulation to the inverter (34). A control system (52) for a mechanical system (20) having a motor (28) is also disclosed. The control system (52) may comprise a converter (32) operatively connected to a power source (29), and an inverter (34) operatively connected to the motor (28) of the mechanical system (20). At least one controller may be in communication with the converter (32) and inverter (34), and may be configured to apply at least one of unipolar modulation and bipolar modulation to each of the converter (32) and the inverter (34).
Abstract translation: 公开了一种用于控制具有转换器（32）和逆变器（34）的多电平再生驱动（30）的方法（70）。 方法（70）可以包括将单极调制和双极性调制中的至少一个施加到转换器（32），以及向逆变器（34）施加单极调制和双极性调制中的至少一个。 还公开了一种用于具有马达（28）的机械系统（20）的控制系统（52）。 控制系统（52）可以包括可操作地连接到电源（29）的转换器（32）和可操作地连接到机械系统（20）的电动机（28）的逆变器（34）。 至少一个控制器可以与转换器（32）和逆变器（34）通信，并且可以被配置为向转换器（32）和逆变器（34）中的每一个施加单极调制和双极性调制中的至少一个。
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