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    • 5. 发明专利
    • CONTROL DEVICE FOR ELEVATOR
    • JPH11301934A
    • 1999-11-02
    • JP11459698
    • 1998-04-24
    • HITACHI LTDHITACHI BUILDING SYS CO LTD
    • ONUMA NAOTOMUTO NOBUYOSHIKONYA MASAHIROMITSUTOMI MANABU
    • B66B1/30
    • PROBLEM TO BE SOLVED: To satisfactorily maintain comfortableness at the time of a start of an elevator by correcting an exciting current instruction according to the operation state of the elevator. SOLUTION: Comfortableness is an important factor for an elevator, and a speed instruction generating means 100 generates a speed instruction ωR in consideration of it. The speed instruction ωR is inputted to a terminal on the addition side of an adding/subtracting means 110, the rotation angular velocity ωM of the rotor of a motor 60 detected by a speed detecting means 120 fitted to the rotor of the motor 60 is inputted to a terminal on the subtraction side of the adding/subtracting means 110, and a speed deviation is generated from the difference between them. A speed control means 130 generates the torque instruction ωR in response to the speed deviation. The torque instruction ωR is inputted to the addition side terminal of an adding/subtracting means 140. The instantaneous torque ωM generated in the motor 60 at this time from a generated torque estimating means 150 is inputted to the subtraction side terminal of the adding/subtracting means 140.
    • 8. 发明专利
    • VARIABLE SPEED MOVING FOOTWAY
    • JP2000247564A
    • 2000-09-12
    • JP4635699
    • 1999-02-24
    • HITACHI LTD
    • TERAMOTO RITSUFUJINO ATSUYAMITSUTOMI MANABU
    • B66B21/12B66B23/02
    • PROBLEM TO BE SOLVED: To provide a variable speed moving footway capable of driving in both directions by a simple driving means such as a chain and the like. SOLUTION: An engagement body 3 (3a, 3b) is mounted on a chain 12, an engagement member 2 (2a, 2b) is mounted on a pallet 1, and a shape central shaft of the engagement body 3 (3a, 3b) in the engagement is approximately agreed with a central shaft of at least one of rollers 24 (24a, 24b) supporting the pallet 1. A clearance in the direction vertical to the horizontal moving direction, is optionally formed between a recess of the engagement member and the engagement body. Engagement device 6 (6a, 6b) are mounted with a fore and aft interval more than a value of a larger radius of the adjacent sprockets. Whereby the engagement device 6 capable of transmitting the driving force to left and right can be provided, and this variable speed moving footway capable of driving in both directions can be provided. Further the engagement can be ensured even when the relative positions of the engagement member 2 and the engagement body 3 are shifted from one another, or when the pallet 1 is rotated around the sprocket, so that the moving footway capable of circulately driving within a vertical surface, can be realized. Further a driving system free from the contact interference of the sprocket and a shaft can be provided.
    • 9. 发明专利
    • DAMPING CONTROL DEVICE FOR LINEAR MOTOR ELEVATOR
    • JPH10279201A
    • 1998-10-20
    • JP9341297
    • 1997-04-11
    • HITACHI LTD
    • MITSUTOMI MANABUARAHORI NOBORUSAWADA MASAHITO
    • B66B9/02B66B1/06B66B1/30
    • PROBLEM TO BE SOLVED: To effectively suppress car vibration caused by the resonance or the like of the rope system of an elevator during the low-speed running or the landing error correcting running of a linear motor by detecting the weight of a load placed on the elevator and switching the limit value of a linear motor current frequency based on the detected load weight and a running direction. SOLUTION: During elevator running, a thrust command signal Tq based on a difference between a command speed ωr and a linear induction motor speed ωm is outputted from a speed controller 19. This signal Tq is converted into a sliding frequency command signal ωs by a proportional compensator 20, and then it is made a primary current frequency command signal ω1 by adding the speed signal ωm. On the other hand, a frequency limit value ωL is calculated by a resonance prevention calculator 22 based on a load amount L by the load detector 21 of a car, and this value is used as the limiter value of ω1 to be set as a last primary current frequency command signal ωL1. Then, a three-phase current command signal is obtained from primary current command signals 1L1 and ω1 obtained via a current limiter 25 and used for controlling of a power converter 30.