WO1994004453A1 - An energy balanced numerically controlled elevator - Google Patents

An energy balanced numerically controlled elevator Download PDF

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Publication number
WO1994004453A1
WO1994004453A1 PCT/US1993/004704 US9304704W WO9404453A1 WO 1994004453 A1 WO1994004453 A1 WO 1994004453A1 US 9304704 W US9304704 W US 9304704W WO 9404453 A1 WO9404453 A1 WO 9404453A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
total mass
balance load
elevator
electrified source
Prior art date
Application number
PCT/US1993/004704
Other languages
French (fr)
Inventor
Henry Yao
Hong Sun Hua
Original Assignee
Yale Tech, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yale Tech, Inc. filed Critical Yale Tech, Inc.
Publication of WO1994004453A1 publication Critical patent/WO1994004453A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/24—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration
    • B66B1/28—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical
    • B66B1/30—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical effective on driving gear, e.g. acting on power electronics, on inverter or rectifier controlled motor
    • B66B1/302—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical effective on driving gear, e.g. acting on power electronics, on inverter or rectifier controlled motor for energy saving

Definitions

  • the present invention relates to elevator systems in general and more particularly to a control system to more efficiently power elevator systems.
  • the conventional elevator is a big electricity consumer because it has to transfer energy into the electrified wire netting during its up and down processes.
  • the mechanical energy derived from the power source, passed through electrified wire to the motor during its lifting process is transformed into potential energy stored in the form of passengers being raised to a higher level. Then passengers change stored potential energy into kinetic energy in their going down to the ground. The passengers who take the elevator up have to take it down again.
  • a well- designed elevator should have a balance of energy exchange except energy loss from friction between mechanical parts. However, that kind of energy loss is minimal. As a result, this condition in which the elevator is a big electricity user is unreasonable from the view of the first law of physics.
  • the elevator system includes an elevator driving system and a control system which either uses power or generates power in dependence upon the relationship between the hanging total mass and the balance load.
  • the process evaluates the relationship between the hanging total mass and the balance load getting upward movement of the elevator to: operate the N.C.
  • the N.C. motor uses the generator function to supply electricity to the electrified source at the frequency of the
  • the N.C. motor is used with the motor function and obtains energy from the electrified source if the total mass is lower than the balance load; and the N.C. motor is supplied with only a small amount of electric energy from the electrified source to overcome friction if the total mass equals the balance load.
  • a numerically controlled electric motor driving system may be provided including a control mechanism for energy recovery.
  • the system includes a motor with an outer rare-earth metal made magnetic pole rotor which is covered by a protecting ring.
  • a stator coil is provided connected to an adjustable inverted electric source which passes through a high output digital switch set and a filter set to connect with a DC load.
  • the DC load controls the adjustable inverted electric source and the digital switch source.
  • the programmable control is connected to the inverted electric source for changing the conventional AC or DC current into frequency and phase adjusted AC current output By controlling the frequency and phase output of the inverted electric source, the rotation speed acceleration rotation direction of the rotor can be managed.
  • An elevator system may be provided using a numerically controlled speedy rare-earth metal motor with an auxiliary installation.
  • the alternating current (AC) contactor of the auxiliary installation automatically short circuits the motor ends in situations of: a) power failure; and b) loss of control.
  • a real-time control software is programmed following the normal working conditions in the N.C. (numerically controlled) CPU (central processing unit), and the load point of CPU is connected with load points of
  • the motor is remodelled using the technique of
  • the N.C. motor is working under the function of the generator (working as a generator).
  • the system passes through the N.C. electric source to invert different period electric energy outputted by the motor into same period electric energy as the electrified wire source for supplying power to the electrified wire source.
  • the elevator also has three conditions:
  • the new elevator has no starting shock current and its highest current is 10-20 times less than that of the conventional elevator. Its power can reach more than 0.97 ratio and is one time more than that of the conventional elevator. The energy consumption of this new elevator under the normal situations is lower by one quantity class (order of magnitude) than that of a conventional elevator.
  • This invention integrates a driving system and a control system into one whole system which consists of the standard electro-mechanical
  • An elevator system is provided with an elevator structure with a known hanging total mass including the weight of the elevator and cargo and having a numerically controlled motor or a rare-earth metal synchronous motor driving a standard arrangement with a known balance load counterweight (the weight of the cargo can be monitored in a known manner).
  • the motor is operated under a motor function obtaining energy from an electrified source if the hanging total mass is greater than the balance load.
  • the motor is operated under a generator function during upward movement, supplying electric energy at a frequency of the electrified source if the hanging total mass is lower than the balance load.
  • the motor is operated under the motor function by supplying only an amount of electric energy from the electrified source for overcoming friction, if the hanging total mass equals the balance load.
  • the invention operates the motor under the generator function and supplies electric energy to the electrified source at a frequency of the electrified source if the handing total mass is greater than the balance load; operates the motor under the motor function and obtains energy from the electrified source if the hanging total mass is lower than the balance load; and supplies only a small amount of electric energy from the electrified source to the motor for overcoming friction if the hanging total mass is equal
  • the new invention creates a simpler and more reliable

Abstract

According to the invention, the elevator system includes an elevator driving system and a control system which either uses power or generates power in dependence upon the relationship between the hanging total mass and the balanced load. The process evaluates the relationship between the hanging total mass and the balance load getting upward movement of the elevator to: operate the N.C. motor with the motor function obtaining energy from an electrified source, if the hanging total mass is greater than the balance load; operate the numerically controlled motor with the generator function and output electric energy at a frequency of the electrified source for supplying power to the electrified source if the hanging total mass is lower than the balance load and supplying only an amount of energy from the electrified source to the numerically controlled motor for overcoming friction when the hanging total mass substantially equals the balance load; and during downward movement of the elevator, the N.C. motor uses the generator function to supply electricity to the electrified source at the frequency of the electrified source if the total mass is greater than the balance load; the N.C. motor is used with the motor function and obtains energy from the electrified source if the total mass is lower than the balance load; and the N.C. motor is supplied with only a small amount of electric energy from the electrified source to overcome friction if the total mass equals the balance load.

Description

AN ENERGY BALANCED NUMERICALLY CONTROLLED ELEVATOR
TECHNICAL FIELD OF THE INVENTION
The present invention relates to elevator systems in general and more particularly to a control system to more efficiently power elevator systems.
BACKGROUND ART OF THE INVENTION
The conventional elevator is a big electricity consumer because it has to transfer energy into the electrified wire netting during its up and down processes. From the first law of physics (power is neither created nor destroyed), the mechanical energy derived from the power source, passed through electrified wire to the motor during its lifting process is transformed into potential energy stored in the form of passengers being raised to a higher level. Then passengers change stored potential energy into kinetic energy in their going down to the ground. The passengers who take the elevator up have to take it down again. From analyzing the first law of physics, a well- designed elevator should have a balance of energy exchange except energy loss from friction between mechanical parts. However, that kind of energy loss is minimal. As a result, this condition in which the elevator is a big electricity user is unreasonable from the view of the first law of physics.
SUMMARY AND OBJECTS OF THE INVENTION
It is an object of the invention to provide an elevator system which efficiently uses power based on the relationship between the mass of the elevator (the hanging total mass) and the counter rate (balance load).
According to the invention, the elevator system includes an elevator driving system and a control system which either uses power or generates power in dependence upon the relationship between the hanging total mass and the balance load. The process evaluates the relationship between the hanging total mass and the balance load getting upward movement of the elevator to: operate the N.C. motor with the motor function obtaining energy from an electrified source, if the hanging total mass is greater than the balance load; operate the numerically controlled motor with the generator function and output electric energy at a frequency of the electrified source for supplying power to the electrified source if the hanging total mass is lower than the balance load and supplying only an amount of energy from the electrified source to the numerically controlled motor for overcoming friction when the hanging total mass substantially equals the balance load; and during downward movement of the elevator, the N.C. motor uses the generator function to supply electricity to the electrified source at the frequency of the
electrified source if the total mass is greater than the balance load; the N.C. motor is used with the motor function and obtains energy from the electrified source if the total mass is lower than the balance load; and the N.C. motor is supplied with only a small amount of electric energy from the electrified source to overcome friction if the total mass equals the balance load.
A numerically controlled electric motor driving system may be provided including a control mechanism for energy recovery. The system includes a motor with an outer rare-earth metal made magnetic pole rotor which is covered by a protecting ring. A stator coil is provided connected to an adjustable inverted electric source which passes through a high output digital switch set and a filter set to connect with a DC load. The DC load controls the adjustable inverted electric source and the digital switch source. The programmable control is connected to the inverted electric source for changing the conventional AC or DC current into frequency and phase adjusted AC current output By controlling the frequency and phase output of the inverted electric source, the rotation speed acceleration rotation direction of the rotor can be managed. This provides the ability to recovery energy and in the case of restored potential energy (raised elevator with load greater than counter balance, lowered elevator with load less than counter balance, raised crane with load greater than counter balance etc.) whereby potential energy changes into mechanical energy and through the motor comes 3-phase AC current output.
An elevator system may be provided using a numerically controlled speedy rare-earth metal motor with an auxiliary installation. The alternating current (AC) contactor of the auxiliary installation automatically short circuits the motor ends in situations of: a) power failure; and b) loss of control.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying descriptive matter in which a preferred embodiment of the invention is described.
DETAILED DESCRIPTION
OF THE PREFERRED EMBODIMENT
This invention applies the features of "N.C. electric pulling system" (Chinese patent No. 92100001.4 hereby incorporated by reference) and "N.C. electric pulling system with energy recovery function" (Chinese patent no.
92209245.1 hereby incorporated by reference) as the pulling power of the elevator. A real-time control software is programmed following the normal working conditions in the N.C. (numerically controlled) CPU (central processing unit), and the load point of CPU is connected with load points of
all the control systems. Also, the motor is remodelled using the technique of
Chinese patent no. 91203427.0 (hereby incorporated by reference) or it can be a rare-earth metal s nchronous motor. With this structure a super elevator according to the invention with energy balance may be achieved. The most important characteristics of this kind of elevator is saving energy. During the up process, there are three following conditions:
(1) UA — If the hanging total mass is greater than the balance load, the N.C. motor is working under the function of the motor (using power providing a motor function) and then the system obtains energy from the electrified source.
(2) UB - If the hanging total mass is lower than the balance load, the N.C. motor is working under the function of the generator (working as a generator). The system passes through the N.C. electric source to invert different period electric energy outputted by the motor into same period electric energy as the electrified wire source for supplying power to the electrified wire source.
(3) UC — If the hanging total mass equals the balance load, the N.C. motor spine and so only small amount of electric energy from the electrified wire source is used for overcoming friction.
During the down process, the elevator also has three conditions:
(1) DA — If the total mass is greater than the balance load, the system has the same conditions as UB.
(2) DB — If the total mass is lower than the balance load, the system has the same reactions as UA.
(3) DC - If the total mass equals the balance load, the system has working condition as UC. Following the motion formula of the elevator, the daily sum energy of electric field A equals:
A = (UA+UB+DA+DB) = 0
The new elevator has no starting shock current and its highest current is 10-20 times less than that of the conventional elevator. Its power can reach more than 0.97 ratio and is one time more than that of the conventional elevator. The energy consumption of this new elevator under the normal situations is lower by one quantity class (order of magnitude) than that of a conventional elevator. This invention integrates a driving system and a control system into one whole system which consists of the standard electro-mechanical
components.
An elevator system according to the invention is provided with an elevator structure with a known hanging total mass including the weight of the elevator and cargo and having a numerically controlled motor or a rare-earth metal synchronous motor driving a standard arrangement with a known balance load counterweight (the weight of the cargo can be monitored in a known manner). During upward movement, the motor is operated under a motor function obtaining energy from an electrified source if the hanging total mass is greater than the balance load. The motor is operated under a generator function during upward movement, supplying electric energy at a frequency of the electrified source if the hanging total mass is lower than the balance load. During upward movement the motor is operated under the motor function by supplying only an amount of electric energy from the electrified source for overcoming friction, if the hanging total mass equals the balance load. During downward movement the invention operates the motor under the generator function and supplies electric energy to the electrified source at a frequency of the electrified source if the handing total mass is greater than the balance load; operates the motor under the motor function and obtains energy from the electrified source if the hanging total mass is lower than the balance load; and supplies only a small amount of electric energy from the electrified source to the motor for overcoming friction if the hanging total mass is equal
to the balance load.
As a conclusion, the new invention creates a simpler and more reliable
elevator than the conventional one.
While a specific embodiment of the invention has been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.

Claims

WHAT IS CLAIMED IS:
1. An elevator system having a hanging total mass including the weight of the elevator and cargo and having a numerically controlled motor or a rare- earth metal synchronous motor, comprising: during upward movement operating the motor under a motor function obtaining energy from an electrified source if the hanging total mass is greater than the balance load; operating the motor under a generator function and supplying electric energy at a frequency of the electrified source if the hanging total mass is lower than the balance load; and operating the motor under the motor function by supplying only an amount of electric energy from the electrified source for overcoming friction, if the hanging total mass equals the balance load; and during downward movement operating the motor under the generator function and supplying electric energy to the electrified source at a frequency of the electrified source if the handing total mass is greater than the balance load; operating the motor under the motor function and obtaining energy from the electrified source if the hanging total mass is lower than the balance load; and supplying only a small amount of electric energy from the electrified source to the motor for overcoming friction if the hanging total mass is equal
to the balance load.
PCT/US1993/004704 1992-08-18 1993-05-14 An energy balanced numerically controlled elevator WO1994004453A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 92109385 CN1082506A (en) 1992-08-18 1992-08-18 Numerical controlled lift that can recuperated energy
CN92109385.3 1992-08-18

Publications (1)

Publication Number Publication Date
WO1994004453A1 true WO1994004453A1 (en) 1994-03-03

Family

ID=4944121

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/004704 WO1994004453A1 (en) 1992-08-18 1993-05-14 An energy balanced numerically controlled elevator

Country Status (2)

Country Link
CN (1) CN1082506A (en)
WO (1) WO1994004453A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102251940A (en) * 2011-06-23 2011-11-23 陈仁多 High-power electricity generating device for reducing energy consumption of elevator
CN107117505A (en) * 2017-05-29 2017-09-01 无锡商业职业技术学院 It is a kind of can self-generating elevator
CN114162691A (en) * 2021-11-04 2022-03-11 广东格菱电梯有限公司 Energy-saving vertical elevator and energy-saving method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2067366A (en) * 1979-12-28 1981-07-22 Westinghouse Electric Corp Elevator system
US4754850A (en) * 1987-07-29 1988-07-05 Westinghouse Electric Corp. Method for providing a load compensation signal for a traction elevator system
EP0477867A2 (en) * 1990-09-28 1992-04-01 Otis Elevator Company Elevator start control technique for reduced start jerk and acceleration overshoot

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2067366A (en) * 1979-12-28 1981-07-22 Westinghouse Electric Corp Elevator system
US4754850A (en) * 1987-07-29 1988-07-05 Westinghouse Electric Corp. Method for providing a load compensation signal for a traction elevator system
EP0477867A2 (en) * 1990-09-28 1992-04-01 Otis Elevator Company Elevator start control technique for reduced start jerk and acceleration overshoot

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Publication number Publication date
CN1082506A (en) 1994-02-23

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