-
公开(公告)号：US11866295B2
公开(公告)日：2024-01-09
申请号：US16105581
申请日：2018-08-20
Applicant: OTIS Elevator Company
Inventor： Prasanna Nagarajan , David Ginsberg , Shashank Krishnamurthy , Daryl J. Marvin , Ronnie E. Thebeau
CPC classification number: B66B1/32 , B66B5/0031 , B66B5/0037 , B66B5/02 , B66B5/04
Abstract: An elevator system control system is provided and includes a sensor system configured to sense elevator car conditions, a safety system signaling element to generate a safety signal indicative of an incident and a control system configured to react to the safety system signal. When the control system receives the safety signal indicating that an incident has occurred that requires engagement of at least one of primary and secondary brakes, the control system controls a deceleration rate during the incident by operating the primary brake, determining whether the deceleration rate is within a target range and adjusting the deceleration rate based on signals from the sensor system.
-
公开(公告)号：US20190097551A1
公开(公告)日：2019-03-28
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.
-
公开(公告)号：US11040848B2
公开(公告)日：2021-06-22
申请号：US15937104
申请日：2018-03-27
Applicant: OTIS ELEVATOR COMPANY
Inventor： Camilo Cardona , Prasanna Nagarajan , Antoine Adrian Blanchard , Emmanuel Convard , Gregor Stricker , Michael Peters
Abstract: An illustrative elevator system includes an elevator car, a machine including a motor that provides a motive force for moving the elevator car along a travel path and a brake that resists movement of the elevator car, and a brake controller. The brake controller is configured to determine when the elevator car is within a selected range of at least one end of the travel path. The brake controller inhibits a delay in application of the brake when the elevator car is within the selected range and permits a delay in application of the brake when the elevator car is outside of the selected range.
-
公开(公告)号：US20200055693A1
公开(公告)日：2020-02-20
申请号：US16105581
申请日：2018-08-20
Applicant: OTIS Elevator Company
Inventor： Prasanna Nagarajan , David Ginsberg , Shashank Krishnamurthy , Daryl J. Marvin , Ronnie E. Thebeau
Abstract: An elevator system control system is provided and includes a sensor system configured to sense elevator car conditions, a safety system signaling element to generate a safety signal indicative of an incident and a control system configured to react to the safety system signal. When the control system receives the safety signal indicating that an incident has occurred that requires engagement of at least one of primary and secondary brakes, the control system controls a deceleration rate during the incident by operating the primary brake, determining whether the deceleration rate is within a target range and adjusting the deceleration rate based on signals from the sensor system.
-
公开(公告)号：US11014778B2
公开(公告)日：2021-05-25
申请号：US15750955
申请日：2016-08-03
Applicant: Otis Elevator Company
Inventor： Edward D. Piedra , Prasanna Nagarajan
Abstract: A permanent magnet (PM) synchronous electric motor (34) includes a plurality of phases, and a plurality of motor drives (55,58) electrically connected to the PM synchronous electric motor. Each of the motor drives is operatively connected to a corresponding one of the plurality of phases. The plurality of motor drives is configured and disposed to deliver a torque current divided equally between each of the plurality of phases and independently deliver flux current to the corresponding one of the plurality of phases. A controller (44) is operatively connected to each of the plurality of motor drives to selectively control the PM synchronous electric motor, and a rescue module (120) operatively connected to the controller, the rescue module being configured and disposed to determine a failure of one of the plurality of motor drives and control the PM synchronous electric motor in a reduced operation profile employing remaining ones of the plurality of motor drives.
-
Patent Agency Ranking
公开(公告)号：US20180215582A1
公开(公告)日：2018-08-02
申请号：US15935753
申请日：2018-03-26
Applicant: OTIS ELEVATOR COMPANY
Inventor： Amir Lotfi , Prasanna Nagarajan , HanJong Kim
CPC classification number: B66B5/027 , B66B1/32 , B66B1/3423 , B66B2201/40
Abstract: A method of operating an elevator system including: controlling, using a controller, a plurality of components of the elevator system, controlling includes operating at least one of an internal power source, an elevator car, a drive unit, a power conversion device, and a brake; detecting when an external power source is unavailable; deactivating the power conversion device when external power source is unavailable; determining at least one of a motoring mode and a near balance mode; connecting to an internal power source when at least one of the motoring mode and the near balance mode is determined; activating the power conversion device when at least one of the motoring mode and the near balance mode is determined; and increasing, using the internal power source, voltage of the drive unit, the internal power source is configured to provide an uninterrupted power to drive unit when the external power source is unavailable.
-
公开(公告)号：US20170283213A1
公开(公告)日：2017-10-05
申请号：US15090843
申请日：2016-04-05
Applicant: Otis Elevator Company
Inventor： Amir Lotfi , Prasanna Nagarajan , HanJong Kim
CPC classification number: B66B1/3423 , B66B1/30 , B66B1/32 , B66B5/0018 , B66B5/02 , B66B5/027 , B66B9/00 , B66B2201/00
Abstract: A method of operating an elevator system is presented. The method comprises controlling, using a controller, a plurality of components of the elevator system. The controlling comprises operating at least one of an internal power source, an elevator car, a drive unit, a power conversion device, and a brake. The method also comprises detecting, using the controller, when an external power source is unavailable; deactivating, using the controller, the power conversion device when an external power source is unavailable; and determining, using the controller, a mode of the elevator car. The mode includes at least one of a motoring mode and a near balance mode. The method further comprises connecting, using the controller, to an internal power source, when at least one of the motoring mode and the near balance mode is determined; and increasing, using the internal power source, voltage of the drive unit.
-
公开(公告)号：US20240275314A1
公开(公告)日：2024-08-15
申请号：US18166513
申请日：2023-02-09
Applicant: OTIS ELEVATOR COMPANY
Inventor： Steven Michael Millett , Prasanna Nagarajan
CPC classification number: H02P3/22 , B66B1/06 , B66B11/043
Abstract: An elevator drive configured to control power to an elevator motor includes a plurality of first (upper) inverter switches and a plurality of second (lower) inverter switches. A processor is configured to provide control signals to control operation of the inverter switches. A first signal buffer between the processor and the inverter switches is configured to selectively prevent any control signals from turning on any of the inverter switches when the motor should not receive power. A second signal buffer between the processor and the inverter switches is configured to selectively bypass the first signal buffer, prevent any control signals from turning on the first inverter switches, and allow a control signal from the processor to turn on the second inverter switches to provide motor braking.
-
公开(公告)号：US20240275313A1
公开(公告)日：2024-08-15
申请号：US18166511
申请日：2023-02-09
Applicant: OTIS ELEVATOR COMPANY
Inventor： Prasanna Nagarajan
CPC classification number: H02P3/22 , B66B1/06 , B66B11/043
Abstract: An elevator machine assembly includes a motor and an elevator drive configured to control power supply to the motor. The elevator drive includes at least a plurality of converter switches and an energy storage device that is situated to be charged in response to the motor generating a back emf as the motor rotates in response to a torque applied to the motor when the elevator drive is not providing power to the motor. A short-circuiting module that is selectively coupled with the energy storage device through the converter switches selectively discharges the energy storage device to limit the back emf of the motor and a corresponding speed at which the motor rotates.
-
公开(公告)号：US10513413B2
公开(公告)日：2019-12-24
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).
-
-
-
-
-
-
-
-
-
Search Results
20
records
(took 0.017 seconds)
