公开(公告)号：US20240426947A1

公开(公告)日：2024-12-26

申请号：US18698581

申请日：2021-10-07

Applicant: Hitachi, Ltd.

Inventor： Yuki SAITO ,  Akira IWAMOTO ,  Hiroki MATSUURA ,  Hiroyuki YAMAMOTO

IPC: G01R31/72 ,  B66B5/00

Abstract: Provided is a failure detection device for an electric actuator for an emergency stop device that can improve maintainability of an electric device portion. The failure detection device for the electric actuator for the emergency stop device detects a failure of the electric actuator (10). The electric actuator actuates a drive mechanism that drives the elevator emergency stop device, and includes a movable element (a, 34b, 34c) mechanically connected to the drive mechanism and a first electromagnet (35a) and a second electromagnet (35b) facing the movable element. The failure detection device includes: a position detector (109) configured to detect a position of the movable element; and a controller (103) configured to detect a failure of the electric actuator based on a position detection signal from the position detector. The controller issues a command to cut off energization of the first electromagnet during standby of the electric actuator, and then detects a failure of the second electromagnet based on the position detection signal.

公开(公告)号：US20250136411A1

公开(公告)日：2025-05-01

申请号：US18834406

申请日：2022-03-17

Applicant: Hitachi, Ltd.

Inventor： Yuki SAITO ,  Akira IWAMOTO ,  Hiroki MATSUURA

IPC: B66B5/22 ,  B66B5/02

Abstract: An elevator has a power outage operation function including an emergency stop device that is provided in the elevator car, and a drive mechanism that is configured to drive the emergency stop device. An electric actuator is configured to actuate the drive mechanism, and a control device is configured to control an operation of the car. The electric actuator includes a movable element mechanically connected to the drive mechanism, electromagnets facing the element, and a mechanism to convert rotation of a motor into linear movement of the electromagnets. When the control device determines that the electric actuator is actuated due to a power outage, the control device instructs the electric actuator to perform a return operation of returning the movable element to a standby position, and operates the car to move up and land on a nearest floor above a stop position of the car when the return operation fails.

公开(公告)号：US20240327167A1

公开(公告)日：2024-10-03

申请号：US18697592

申请日：2021-10-07

Applicant: Hitachi, Ltd.

Inventor： Yuki SAITO ,  Yasushi ITO ,  Yosuke KUBO ,  Akira IWAMOTO ,  Hiroki MATSUURA ,  Hiroyuki YAMAMOTO

IPC: B66B5/00

CPC classification number: B66B5/0093 ,  B66B5/0031

Abstract: Provided is an operation confirmation device for an electric actuator for an emergency stop device that can improve maintainability of an electric device portion. The operation confirmation device for the electric actuator for the emergency stop device confirms operation of an electric actuator (10). The electric actuator actuates a drive mechanism that drives the elevator emergency stop device, and includes a movable element (34a, 34b, 34c) mechanically connected to the drive mechanism, an electromagnet (35a, 35b) facing the movable element, and a mechanism portion (36, 41) configured to convert rotation of a motor (37) into linear movement of the electromagnet. The operation confirmation device includes: a position detector (109) configured to detect a position of the movable element; and a controller (7) configured to detect a failure of the motor based on a position detection signal from the position detector. The controller issues a command to rotate the motor during standby of the electric actuator, and then detects the failure of the motor based on the position detection signal.